Microchip Technology - PIC16F18446 Curiosity Nano Hardware …ww1.microchip.com/downloads/en/DeviceDoc/50002808B.pdf · 2019-10-08 · PIC16F18446 Curiosity Nano PIC16F18446 Curiosity

PIC16F18446 Curiosity Nano PIC16F18446 Curiosity Nano Hardware User Guide

PrefaceThe PIC16F18446 Curiosity Nano Evaluation Kit is a hardware platform to evaluate the PIC16F18446 microcontroller(MCU).

Supported by MPLAB® X IDE Integrated Development Environment (IDE), the kit provides easy access to thefeatures of the PIC16F18446 to explore how to integrate the device into a custom design.

The Curiosity Nano series of evaluation kits include an on-board debugger. No external tools are necessary toprogram and debug the PIC16F18446.

© 2019 Microchip Technology Inc. User Guide DS50002808B-page 1

Table of Contents

Preface...........................................................................................................................................................1

1. Introduction............................................................................................................................................. 4

1.1. Features....................................................................................................................................... 41.2. Kit Overview................................................................................................................................. 4

2. Getting Started........................................................................................................................................ 5

2.1. Curiosity Nano Quick Start MPLAB® Xpress............................................................................... 52.2. Curiosity Nano Quick Start...........................................................................................................52.3. Design Documentation and Relevant Links................................................................................. 5

3. Curiosity Nano.........................................................................................................................................7

3.1. On-board Debugger..................................................................................................................... 73.2. Curiosity Nano Standard Pinout.................................................................................................103.3. Power Supply............................................................................................................................. 103.4. Target Current Measurement..................................................................................................... 133.5. Disconnecting the On-Board Debugger..................................................................................... 14

4. Hardware User Guide........................................................................................................................... 16

4.1. Connectors.................................................................................................................................164.2. Peripherals................................................................................................................................. 174.3. On-Board Debugger Implementation......................................................................................... 18

5. Hardware Revision History and Known Issues..................................................................................... 20

5.1. Identifying Product ID and Revision........................................................................................... 205.2. DAC pin limitations.....................................................................................................................205.3. Revision 7...................................................................................................................................205.4. Revision 5...................................................................................................................................20

6. Document Revision History...................................................................................................................22

7. Appendix............................................................................................................................................... 23

7.1. Schematic...................................................................................................................................237.2. Assembly Drawing......................................................................................................................257.3. Curiosity Nano Base for Click boards™...................................................................................... 267.4. Connecting External Debuggers................................................................................................ 27

The Microchip Website.................................................................................................................................28

Product Change Notification Service............................................................................................................28

Customer Support........................................................................................................................................ 28

Microchip Devices Code Protection Feature................................................................................................ 28

Legal Notice................................................................................................................................................. 28

Trademarks.................................................................................................................................................. 29

Quality Management System....................................................................................................................... 29

PIC16F18446 Curiosity Nano


Worldwide Sales and Service.......................................................................................................................30



1. Introduction

1.1 Features• PIC16F18446-I/GZ Microcontroller• One Yellow User LED• One Mechanical User Switch• One 32.768 kHz Crystal• On-Board Debugger:

– Board identification in MPLAB® X IDE– One green power and status LED– Programming and debugging– Virtual COM port (CDC)– One logic analyzer channel (DGI GPIO)

• USB Powered• Adjustable Target Voltage:

– MIC5353 LDO regulator controlled by the on-board debugger– 2.3 - 5.1 V output voltage (limited by USB input voltage)– 500 mA maximum output current (limited by ambient temperature and output voltage)

1.2 Kit OverviewThe Microchip PIC16F18446 Curiosity Nano Evaluation Kit is a hardware platform to evaluate the PIC16F18446microcontroller.

Figure 1-1. PIC16F18446 Curiosity Nano Evaluation Kit Overview

Micro USB Connector Debugger

Power/Status LED

32.768 kHz Crystal

User LED (LED0)

User Switch (SW0)

PIC16F18446 MCU

PIC16F18446 Curiosity NanoIntroduction


2. Getting Started

2.1 Curiosity Nano Quick Start MPLAB® XpressSteps to start exploring the Curiosity Nano platform with MPLAB Xpress:

1. Go to https://mplabxpress.microchip.com, and open MPLAB Xpress.2. Create a new stand-alone project for PIC16F18446.3. Use the MPLAB Xpress Code Configurator, or write your own code.4. Compile and download your application HEX file.5. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the debug USB port on the

kit.6. Copy the application HEX file into the CURIOSITY mass storage drive to program the application into the

PIC16F18446.

To use advanced debug features of the Curiosity Nano kit, package the MPLAB Xpress project for MPLAB X IDE,and follow the quick start guide in the next section.

2.2 Curiosity Nano Quick StartSteps to start exploring the Curiosity Nano platform:

1. Download MPLAB® X IDE.2. Launch MPLAB® X IDE.3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the debug USB port on the

kit.

When the Curiosity Nano kit is connected to your computer for the first time, the operating system will perform adriver software installation. The driver file supports both 32- and 64-bit versions of Microsoft® Windows® XP,Windows Vista®, Windows 7, Windows 8, and Windows 10. The drivers for the kit are included with MPLAB® X IDE.

Once the Curiosity Nano board is powered, the green status LED will be lit and MPLAB® X IDE will auto-detect whichCuriosity Nano board is connected. MPLAB® X IDE will present relevant information like data sheets and kitdocumentation. The PIC16F18446 device is programmed and debugged by the on-board debugger and therefore noexternal programmer or debugger tool is required.

2.3 Design Documentation and Relevant LinksThe following list contains links to the most relevant documents and software for the PIC16F18446 Curiosity Nano.

• MPLAB® X IDE - MPLAB® X IDE is a software program that runs on a PC (Windows®, Mac OS®, Linux®) todevelop applications for Microchip microcontrollers and digital signal controllers. It is called an IntegratedDevelopment Environment (IDE) because it provides a single integrated “environment” to develop code forembedded microcontrollers.

• MPLAB® Xpress Cloud-based IDE - MPLAB® Xpress Cloud-Based IDE is an online development environmentthat contains the most popular features of our award-winning MPLAB X IDE. This simplified and distilledapplication is a faithful reproduction of our desktop-based program, which allows users to easily transitionbetween the two environments.

• MPLAB® Code Configurator - MPLAB® Code Configurator (MCC) is a free software plug-in that provides agraphical interface to configure peripherals and functions specific to your application.

• Microchip Sample Store - Microchip sample store where you can order samples of devices.• Data Visualizer - Data Visualizer is a program used for processing and visualizing data. The Data Visualizer

can receive data from various sources such as the EDBG Data Gateway Interface found on Curiosity Nano andXplained Pro boards and COM Ports.

• PIC16F18446 Curiosity Nano website - Kit information, latest user guide and design documentation.

PIC16F18446 Curiosity NanoGetting Started


https://www.microchip.com/mplab/mplab-x-idehttps://www.microchip.com/mplab/mplab-xpresshttps://www.microchip.com/mplab/mplab-code-configuratorhttps://www.microchip.com/samples/default.aspxhttps://www.microchip.com/mplab/avr-support/data-visualizerhttp://www.microchip.com/DevelopmentTools/ProductDetails.aspx?PartNO=DM164144

• PIC16F18446 Curiosity Nano on microchipDIRECT - Purchase this kit on microchipDIRECT.

PIC16F18446 Curiosity NanoGetting Started


http://www.microchipdirect.com/ProductSearch.aspx?Keywords=DM164144

3. Curiosity NanoCuriosity Nano is an evaluation platform of small boards with access to most of the microcontrollers I/Os. Theplatform consists of a series of low pin count microcontroller (MCU) boards with on-board debuggers, which areintegrated with MPLAB® X IDE. Each board is identified in the IDE, and relevant user guides, application notes, datasheets, and example code are easy to find. The on-board debugger features a Virtual COM port (CDC) for serialcommunication to a host PC, and a Data Gateway Interface (DGI) GPIO logic analyzer pin.

3.1 On-board DebuggerThe PIC16F18446 Curiosity Nano contains an on-board debugger for programming and debugging. The on-boarddebugger is a composite USB device of several interfaces: A debugger, a mass storage device, a data gateway, anda Virtual COM port (CDC).

Together with MPLAB® X IDE, the on-board debugger can program and debug the PIC16F18446.

A Data Gateway Interface (DGI) is available for use with the logic analyzer channels for code instrumentation tovisualize the program flow. DGI GPIOs can be graphed using the Data Visualizer.

The Virtual COM port (CDC) is connected to a Universal Asynchronous Receiver/Transmitter (UART) on thePIC16F18446 and provides an easy way to communicate with the target application through terminal software.

The on-board debugger controls a Power and Status LED (marked PS) on the PIC16F18446 Curiosity Nano. Thetable below shows how the LED is controlled in different operation modes.

Table 3-1. On-Board Debugger LED Control

Operation Mode Status LED

Boot Loader mode LED blink at 1 Hz during power-up.

Power-up LED is ON.

Normal operation LED is ON.

Programming Activity indicator: The LED flashes slowly during programming/debugging.

Fault The LED flashes fast if a power fault is detected.

Sleep/Off LED is OFF. The on-board debugger is either in Sleep mode or powered down. Thiscan occur if the kit is externally powered.

3.1.1 Virtual COM Port (CDC)The Virtual COM port (CDC) is a general purpose serial bridge between a host PC and a target device.

3.1.1.1 OverviewThe on-board debugger implements a composite USB device that includes a standard Communications Device Class(CDC) interface, which appears on the host as a Virtual COM port. The CDC can be used to stream arbitrary data inboth directions between the host and the target: All characters sent from the host will be sent through a UART on theCDC TX pin, and UART characters sent into the CDC RX pin will be sent back to the host through the Virtual COMport.

On Windows machines, the CDC will enumerate as Curiosity Virtual COM Port and appear in the Ports section of theWindows Device Manager. The COM port number can also be found there.

On Linux machines, the CDC will enumerate and appear as /dev/ttyACM#.On MAC machines, the CDC will enumerate and appear as /dev/tty.usbmodem#. Depending on which terminalprogram is used, it will appear in the available list of modems as usbmodem#.

PIC16F18446 Curiosity NanoCuriosity Nano


https://www.microchip.com/mplab/avr-support/data-visualizer

Info: On older Windows systems, a USB driver is required for CDC. This driver is included in MPLAB XIDE and Atmel Studio installations.

3.1.1.2 LimitationsNot all UART features are implemented in the on-board debugger CDC. The constraints are outlined here:

• Baud rate: Must be in the range 1200 bps to 500 kbps. Any baud rate outside this range will be set to theclosest limit, without warning. Baud rate can be changed on-the-fly.

• Character format: Only 8-bit characters are supported.• Parity: Can be odd, even, or none.• Hardware flow control: Not supported.• Stop bits: One or two bits are supported.

3.1.1.3 SignalingDuring USB enumeration, the host OS will start both communication and data pipes of the CDC interface. At thispoint, it is possible to set and read back the baud rate and other UART parameters of the CDC, but data sending andreceiving will not be enabled.

When a terminal connects on the host, it must assert the DTR signal. This is a virtual control signal implemented onthe USB interface, but not in hardware in the on-board debugger. Asserting DTR from the host will indicate to the on-board debugger that a CDC session is active, will enable its level shifters (if available) and start the CDC data sendand receive mechanisms.

Deasserting the DTR signal will not disable the level shifters but disable the receiver so no further data will bestreamed to the host. Data packets that are already queued up for sending to the target will continue to be sent out,but no further data will be accepted.

Remember: Enable to set up your terminal emulator to assert the DTR signal. Without it, the on-boarddebugger will not send or receive any data through its UART.

3.1.1.4 Advanced Use

CDC Override ModeIn normal operation, the on-board debugger is a true UART bridge between the host and the device. However, undercertain use cases, the on-board debugger can override the basic operating mode and use the CDC pins for otherpurposes.

Dropping a text file (with extension .txt) into the on-board debugger’s mass storage drive can be used to sendcharacters out of the CDC TX pin. The text file must start with the characters:CMD:SEND_UART=

The maximum message length is 50 characters - all remaining data in the frame are ignored.

The default baud rate used in this mode is 9600 bps, but if the CDC is already active or has been configured, thebaud rate last used still applies.

USB-Level Framing ConsiderationsSending data from the host to the CDC can be done byte-wise or in blocks, which will be chunked into 64-byte USBframes. Each such frame will be queued up for sending to the CDC TX pin. Transferring a small amount of data perframe can be inefficient, particularly at low baud rates, since the on-board debugger buffers frames and not bytes. Amaximum of 4 x 64-byte frames can be active at any time. The on-board debugger will throttle the incoming framesaccordingly. Sending full 64-byte frames containing data is the most efficient.



When receiving data from the target, the on-board debugger will queue up the incoming bytes into 64-byte frames,which are sent to the USB queue for transmission to the host when they are full. Incomplete frames are also pushedto the USB queue at approximately 100 ms intervals, triggered by USB start-of-frame tokens. Up to 8 x 64-byteframes can be active at any time.

If the host, or the software running on it, fails to receive data fast enough, an overrun will occur. When this happens,the last-filled buffer frame will be recycled instead of being sent to the USB queue, and a full frame of data will belost. To prevent this occurrence, the user must ensure that the CDC data pipe is being read continuously, or theincoming data rate must be reduced.

3.1.2 Mass Storage DiskA simple way to program the target device is through drag and drop with .hex files.

3.1.2.1 Mass Storage DeviceThe on-board debugger implements a highly optimized variant of the FAT12 file system that has a number oflimitations, partly due to the nature of FAT12 itself and optimizations made to fulfill its purpose for its embeddedapplication.

The CURIOSITY drive is USB Chapter 9-compliant as a mass storage device but does not, in any way, fulfill theexpectations of a general purpose mass storage device. This behavior is intentional.

The on-board debugger enumerates as a Curiosity Nano USB device that can be found in the disk drives section ofthe Windows device manager. The CURIOSITY drive appears in the file manager and claims the next available driveletter in the system.

The CURIOSITY drive contains approximately one MB of free space. This does not reflect the size of the targetdevice’s Flash in any way. When programming a .hex file, the binary data are encoded in ASCII with metadataproviding a large overhead, so one MB is a trivially chosen value for disk size.

It is not possible to format the CURIOSITY drive. When programming a file to the target, the filename may appear inthe disk directory listing. This is merely the operating system’s view of the directory, which in reality, has not beenupdated. It is not possible to read out the file contents. Removing and replugging the kit will return the file system toits original state, but the target will still contain the application that has been previously programmed.

To erase the target device, copy a text file starting with “CMD:ERASE” onto the disk.By default, the CURIOSITY drive contains several read-only files for generating icons as well as reporting status andlinking to further information:

• AUTORUN.ICO - icon file for the Microchip logo• AUTORUN.INF - system file required for Windows Explorer to show the icon file• KIT-INFO.HTM - redirect to the development board website• KIT-INFO.TXT - a text file containing details about the kit firmware, name, serial number, and device• STATUS.TXT - a text file containing the programming status of the board

Info: STATUS.TXT is dynamically updated by the on-board debugger, the contents may be cached by theOS and therefore not reflect the correct status.

3.1.2.2 Configuration Words

Configuration Words (PIC® MCU Targets)Configuration Word settings included in the project being programmed after program Flash is programmed. Thedebugger will not mask out any bits in the Configuration Words when writing them, but since it uses Low-VoltageProgramming mode, it is unable to clear the LVP Configuration bit. If the incorrect clock source is selected, forexample, and the board does not boot, it is always possible to perform a bulk erase (always done beforeprogramming) and restore the device to its default settings.



3.2 Curiosity Nano Standard PinoutThe twelve edge connections closest to the USB connector on Curiosity Nano kits have a standardized pinout. Theprogram/debug pins have different functions depending on the target programming interface as shown in the tableand figure below.

Table 3-2. Curiosity Nano Standard Pinout

Debugger Signal ICSPTM Target Description

ID - ID line for extensions

CDC TX UART RX USB CDC TX line

CDC RX UART TX USB CDC RX line

DBG0 ICSPDAT Debug data line

DBG1 ICSPCLK Debug clock line/DGI GPIO

DBG2 GPIO0 DGI GPIO

DBG3 MCLR Reset line

NC - No connect

VBUS - VBUS voltage for external use

VOFF - Voltage Off input

VTG - Target voltage

GND - Common ground

Figure 3-1. Curiosity Nano Standard Pinout

USB

DEBUGGER

PS LEDNC

NC

ID

ID

CDC RX

CDCRX

CDC TX

CDCTX

DBG1

DBG

1

DBG2

DBG

2

VBUS

VBU

S

VOFF

VO

FF

DBG3

DBG

3

DBG0

DBG

0

GND

GN

D

VTG

VTGCURIOSITY NANO

3.3 Power SupplyThe kit is powered through the USB port and contains two LDO regulators, one to generate 3.3V for the on-boarddebugger, and an adjustable LDO regulator for the target microcontroller PIC16F18446 and its peripherals. Thevoltage from the USB connector can vary between 4.4V to 5.25V (according to the USB specification) and will limitthe maximum voltage to the target. The figure below shows the entire power supply system on PIC16F18446Curiosity Nano.



Figure 3-2. Power Supply Block Diagram

USBTarget MCU

Power source

Cut strap

Power consumer P3V3 DEBUGGERPower converter

DEBUGGERRegulator

VUSB

TargetRegulator

Power Supply strap

Adjust

Level shifter

VLVLVREG

I/O I/O GPIOstraps

I/O

On/OffMeasure On/Off

ID system#VOFF

PTC Fuse

Power protection

VBUS

Target Power strap

VTG

3.3.1 Target RegulatorThe target voltage regulator is a MIC5353 variable output LDO. The on-board debugger can adjust the voltage outputsupplied to the kit target section by manipulating the MIC5353’s feedback voltage. The hardware implementation islimited to an approximate voltage range from 1.7V to 5.1V. Additional output voltage limits are configured in thedebugger firmware to ensure that the output voltage never exceeds the hardware limits of the PIC16F18446microcontroller. The voltage limits configured in the on-board debugger on PIC16F18446 Curiosity Nano are 2.3 - 5.1V.

Info: The target voltage is set to 3.3V in production. It can be changed through MPLAB X IDE projectproperties. Any change to the target voltage is persistent, even through a power toggle.

The MIC5353 supports a maximum current load of 500 mA. It is an LDO regulator in a small package, placed on asmall printed circuit board (PCB), and the thermal shutdown condition can be reached at lower loads than 500 mA.The maximum current load depends on the input voltage, the selected output voltage, and the ambient temperature.The figure below shows the safe operating area for the regulator, with an input voltage of 5.1V and an ambienttemperature of 23°C.



Figure 3-3. Target Regulator Safe Operation Area

3.3.2 External SupplyPIC16F18446 Curiosity Nano can be powered by an external voltage instead of the on-board target regulator. Whenthe Voltage Off (VOFF) pin is shorted to ground (GND) the on-board debugger firmware disables the target regulator,and it is safe to apply an external voltage to the VTG pin.

WARNINGApplying an external voltage to the VTG pin without shorting VOFF to GND may cause permanent damageto the kit.

WARNINGAbsolute maximum external voltage is 5.5V for the on-board level shifters, and the standard operatingcondition of the PIC16F18446 is 2.3 - 5.5 V. Applying a higher voltage may cause permanent damage tothe kit.

Programming, debugging, and data streaming are still possible with an external power supply: The debugger andsignal level shifters will be powered from the USB cable. Both regulators, the debugger, and the level shifters arepowered down when the USB cable is removed.

3.3.3 VBUS Output PinPIC16F18446 Curiosity Nano has a VBUS output pin which can be used to power external components that need a5V supply. The VBUS output pin has a PTC fuse to protect the USB against short circuits. A side effect of the PTCfuse is a voltage drop on the VBUS output with higher current loads. The chart below shows the voltage versus thecurrent load of the VBUS output.



Figure 3-4. VBUS Output Voltage vs. Current

3.4 Target Current MeasurementPower to the PIC16F18446 is connected from the on-board power supply and VTG pin through a 100-mil pin headercut Target Power strap marked with “POWER” in silkscreen (J101). To measure the power consumption of thePIC16F18446 and other peripherals connected to the board, cut the Target Power strap and connect an ammeterover the strap.

Figure 3-5. Target Power Strap

Target Power strap (top side)

Tip: A 100-mil pin header can be soldered into the Target Power strap (J101) footprint for easyconnection of an ammeter. Once the ammeter is not needed anymore, place a jumper-cap on the pinheader.



Info: The on-board level shifters will draw a small amount of current even when they are not in use. Amaximum of 10 µA can be drawn from the target power net, and an additional 2 µA can be drawn fromeach I/O pin connected to a level shifter for a total of 20 µA. Disconnect the on-board debugger and levelshifters as described in Section 3.5 Disconnecting the On-Board Debugger and keep any I/O pinconnected to a level shifter in tri-state to prevent leakage.

3.5 Disconnecting the On-Board DebuggerThe block diagram below shows all connections between the debugger and the PIC16F18446 microcontroller. Therounded boxes represent connections to the board edge on PIC16F18446 Curiosity Nano. The signal names shownin Figure 3-1 are printed in silkscreen on the bottom side of the board.

Figure 3-6. On-Board Debugger Connections to the PIC16F18446

DEB

UG

GER

TARGETLevel-Shift

PA04/PA06PA07PA08PA16PA00PA01

USB

DIR x 5

VCC_P3V3

VBUS

VCC

_LEV

EL

VCC

_TA

RGET

DBG0DBG1DBG2DBG3CDC TXCDC RX

CDC RX

CDC TX

DBG3

DBG2

DBG1

DBG0

GPIO straps

LDO

VOFF

LDO

VBUS VTG

VCC_EDGE

Power Supply strap Target Power strap

By cutting the GPIO straps with a sharp tool, as shown in Figure 3-7, all I/Os connected between the debugger andthe PIC16F18446 are completely disconnected. To completely disconnect the target regulator and level shifter powerfrom the target, cut the Power Supply strap (J100) as shown in Figure 3-7.

Info: Cutting the connections to the debugger will disable programming, debugging, data streaming, andthe target power supply. The signals will also be disconnected from the board edge next to the on-boarddebugger section.

Tip: Solder in 0Ω resistors across the footprints or short-circuit them with tin solder to reconnect any cutsignals.



Figure 3-7. Kit Modifications

GPIO straps (bottom side) Power Supply strap (top side)



4. Hardware User Guide

4.1 Connectors

4.1.1 PIC16F18446 Curiosity Nano PinoutAll the PIC16F18446 I/O pins are accessible at the edge connectors on the board. The image below shows the kitpinout.

Figure 4-1. PIC16F18446 Curiosity Nano Pinout

USB

DEBUGGER

PIC16F18446

SW0

LED0

PS LEDNC

NC

ID

IDCDC RX

CDC RXRB4

CDC TXCD

C TXRB6

DBG1

DBG

1RA1ICSPCLK

DBG2

DBG

2RA2LED0

RB4

RB4TX

RB6

RB6RX

RB5

RB5SDA

RB7

RB7SCL

RC5

RC5MOSI

RC4

RC4MISO

RC6

RC6SCK

RC7

RC7SS

GND

GN

D

VBUS

VBU

S

VOFF

VO

FF

DBG3

DBG

3 RA3 MCLR

DBG0

DBG

0 RA0 ICSPDAT

GND

GN

D

VTG

VTG

RA5

RA5 ANA5 SOSCI

RA4

RA4 ANA4 SOSCO

RA2

RA2 ANA2 LED0

RA1

RA1 ANA1 PWM7

RC3

RC3 ANC3 PWM6

RC2

RC2 ANC2 SW0

RC1

RC1 ANC1

RC0

RC0 ANC0

GND

GN

D

PIC16F18446CURIOSITY NANO

Analog

Debug

I2C

SPI

UART

Shared pinout

Peripheral

Port

PWM

Power

Ground

Info: Peripheral signals shown in the image above such as UART, I2C, SPI, ADC, PWM, and others areshown at specific pins to comply with the Curiosity Nano board standard. These signals can usually berouted to alteriative pins using the Peripheral Pin Select (PPS) feature in the PIC16F18446.

4.1.2 Using Pin HeadersThe edge connector footprint on PIC16F18446 Curiosity Nano has a staggered design where each of the holes isshifted 8 mil (~0.2 mm) off center. The hole shift allows the use of regular 100-mil pin headers on the kit withoutsoldering. Once the pin headers are firmly in place, they can be used in normal applications like pin sockets andprototyping boards without any issues.

Tip: Start at one end of the pin header and gradually insert the header along the length of the board.Once all the pins are in place, use a flat surface to push them all the way in.

PIC16F18446 Curiosity NanoHardware User Guide


Tip: For applications where the pin headers will be used permanently, it is still recommended to solderthem in place.

Important: Once the pin headers are in place, they are hard to remove by hand. Use a set of pliers andcarefully remove the pin headers to avoid damage to the pin headers and PCB.

4.2 Peripherals

4.2.1 LEDThere is one yellow user LED available on the PIC16F18446 Curiosity Nano kit that can be controlled by either GPIOor PWM. The LED can be activated by driving the connected I/O line to GND.

Table 4-1. LED Connection

PIC16F18446 Pin Function Shared Functionality

RA2 Yellow LED0 Edge connector

4.2.2 Mechanical SwitchThe PIC16F18446 Curiosity Nano has one mechanical switch. This is a generic user-configurable switch. When theswitch is pressed, it will drive the I/O line to ground (GND).

Tip: There is no externally connected pull-up resistor on the switch. To use the switch, make sure that aninternal pull-up resistor is enabled on pin RC2.

Table 4-2. Mechanical Switch

PIC16F18446 Pin Description Shared Functionality

RC2 User switch (SW0) Edge connector

4.2.3 CrystalThe PIC16F18446 Curiosity Nano board has a 32.768 kHz crystal mounted.

The crystal is not connected to the PIC16F18446 by default, as the GPIOs are routed out to the edge connector. Touse the crystal, some hardware modifications are required. The two I/O lines routed to the edge connector should bedisconnected to reduce the chance of contention to the crystal, and to remove excessive capacitance on the lines.This can be done by cutting the two straps on the bottom side of the board, marked RA4 and RA5 as shown in thefigure below. Next, solder on a solder blob on each of the circular solder points next to the crystal on the top side ofthe board as shown in the figure below.

The 32.768 kHz crystal on PIC16F18446 Curiosity Nano is a Kyocera Corporation ST3215SB32768C0HPWBB 7 pFcrystal.

The crystal has been formally tested and matched to the PIC16F18446 by Kyocera. The test report is available in thedesign documentation distributed with this document for PIC16F18446 Curiosity Nano.



Info: Kyocera Crystal Device Corporation crystals that are matched with specific products can be foundon their website: http://prdct-search.kyocera.co.jp/crystal-ic/?p=en_search/

Table 4-3. Crystal Connections

PIC16F18446 Pin Function Shared Functionality

RA4 SOSCO (Crystal output) Edge connector

RA5 SOSCI (Crystal input) Edge connector

Figure 4-2. Crystal Connection and Cut Straps

4.3 On-Board Debugger ImplementationPIC16F18446 Curiosity Nano features an on-board debugger that can be used to program and debug thePIC16F18446 using In-Circuit Serial Programming™ (ICSP™). The on-board debugger also includes a Virtual COMport (CDC) interface over UART and DGI GPIO. MPLAB® X IDE can be used as a front-end for the on-boarddebugger for programming and debugging. Data Visualizer can be used as a front-end for the CDC and DGI GPIO.

4.3.1 On-Board Debugger ConnectionsThe table below shows the connections between the target and the debugger section. All connections between thetarget and the debugger are tri-stated as long as the debugger is not actively using the interface. Hence, there is littlecontamination of the signals the pins can be configured to anything the user wants.

For further information on how to use the capabilities of the on-board debugger, see Section 3. Curiosity Nano.

Table 4-4. On-Board Debugger Connections

PIC16F18446Pin

Debugger Pin Function Shared Functionality

RB6 CDC TX UART RX (PIC16F18446 RX line) Edge connector

RB4 CDC RX UART TX (PIC16F18446 TX line) Edge connector

RA0 DBG0 ICSP DAT

RA1 DBG1 ICSP CLK Edge connector

RA2 DBG2 GPIO LED and Edge connector

RA3 DBG3 MCLR



http://prdct-search.kyocera.co.jp/crystal-ic/?p=en_search/https://www.microchip.com/mplab/avr-support/data-visualizer

...........continuedPIC16F18446

PinDebugger Pin Function Shared Functionality

VCC_TARGET VCC_LEVEL 2.3 - 5.1 V Supply voltage

GND GND Common ground



5. Hardware Revision History and Known IssuesThis user guide provides the latest available revision of the kit. This section contains information about known issues,a revision history of older revisions, and how older revisions differ from the latest revision.

5.1 Identifying Product ID and RevisionThe revision and product identifier of the PIC16F18446 Curiosity Nano can be found in two ways; either throughMPLAB® X IDE or by looking at the sticker on the bottom side of the PCB.

By connecting a PIC16F18446 Curiosity Nano to a computer with MPLAB® X IDE running, an information window willpop up. The first six digits of the serial number, which is listed under kit details, contain the product identifier andrevision.

The same information can be found on the sticker on the bottom side of the PCB. Most kits will print the identifier andrevision in plain text as A09-nnnn\rr, where “nnnn” is the identifier and “rr” is the revision. The boards with limitedspace have a sticker with only a QR code, containing the product identifier, revision and the serial number.

The serial number string has the following format:

"nnnnrrssssssssss"

n = product identifier

r = revision

s = serial number

The product identifier for PIC16F18446 Curiosity Nano is A09-3120.

5.2 DAC pin limitationsThe DAC output of the PIC16F18446 is on a shared pin with the ICSP clock signal. Due to the load introduced by thepresence of pull-down resistor R204, required for debugging, the DAC output will not be as linear as the ideal output.

If a more linear response is desired, R204 can be removed. Be warned that this modification will render debuggingunusable. Kit programming is not affected by this limitation, and can be done regardless of whether R204 is mounted.

5.3 Revision 7Revision 7 improves the power supply circuit with PTC protection and the Target Power strap for currentmeasurement.

The holes along the edge of the PCB are staggered for convenient use of pin headers without soldering.

5.4 Revision 5Revision 5 is the initially released revision. Figure 5-1 shows a top-down image of this revision alongside its assemblydrawing.

This revision has a different power supply circuit than the one described in Figure 3-2, in particular with regards topower protection used. Refer to Figure 5-2 instead.

Revision 5 does not have the Target Power strap described in 3.4 Target Current Measurement, instead current canbe measured across the Power Suppl strap as described in 3.5 Disconnecting the On-Board Debugger.

The holes along the edge connections are not staggered as described in 4.1.2 Using Pin Headers, and requiresoldering when mounting pin headers.

PIC16F18446 Curiosity NanoHardware Revision History and Known Issues


Figure 5-1. PIC16F18446 Curiosity Nano Revision 5 with assembly drawing

PIC®MCUb

PAC10001 PAC10002 COC100 PAC10101

PAC10102 COC101 PAC10201 PAC10202 COC102

PAC10301 PAC10302 COC103

PAC10401

PAC10402 COC104 PAC10501

PAC10502 COC105

PAC10601 PAC10602 COC106 PAC10701 PAC10702 COC107

PAC10801 PAC10802 COC108

PAC20001 PAC20002

COC200

PAC20301

PAC20302 COC203 PAC20401

PAC20402 COC204

PAC20501 PAC20502 COC205

PAD10002 PAD10001 COD100

PAD20002

PAD20001 COD200

PAJ10002 PAJ10001 COJ100

PAJ10202 PAJ10204

PAJ10201

PAJ10206

PAJ10203 PAJ10205 COJ102

PAJ10507

PAJ10506

PAJ105011 PAJ10509

PAJ105010 PAJ10508

PAJ10505

PAJ10504

PAJ10502

PAJ10503

PAJ10501

PAJ10500

COJ105

PAJ20001 PAJ20002 PAJ20003 PAJ20004 PAJ20005 PAJ20006 PAJ20007 PAJ20008

PAJ200029 PAJ200030 PAJ200027 PAJ200028 PAJ200026 PAJ200025 PAJ200024

PAJ20009 PAJ200010 PAJ200011 PAJ200012 PAJ200013 PAJ200014 PAJ200015

PAJ200023 PAJ200020 PAJ200022 PAJ200021 PAJ200018 PAJ200019 PAJ200016 PAJ200017

PAJ20000

COJ200

PAJ20101 PAJ20102 COJ201

PAJ20201 PAJ20202 COJ202

PAJ20301 PAJ20302 COJ203

PAJ20401 PAJ20402 COJ204

PAJ20501 PAJ20502 COJ205

PAJ20601 PAJ20602 COJ206

PAJ20702 PAJ20701 COJ207

PAJ20802 PAJ20801 COJ208

PAJ20902 PAJ20901 COJ209

PAJ21002 PAJ21001 PAJ21005 COJ210

PAJ21102 PAJ21101 PAJ21105 COJ211 COLABEL1

PAQ10103 PAQ10101 PAQ10102 COQ101 PAR10001 PAR10002 COR100

PAR10101 PAR10102 COR101

PAR10201 PAR10202 COR102

PAR10301 PAR10302 COR103

PAR10401 PAR10402 COR104

PAR10501

PAR10502 COR105

PAR10601 PAR10602 COR106

PAR10701 PAR10702 COR107

PAR10801 PAR10802 COR108

PAR10901 PAR10902 COR109

PAR11001 PAR11002 COR110

PAR11101

PAR11102 COR111

PAR11201 PAR11202 COR112

PAR20001 PAR20002

COR200

PAR20201

PAR20202 COR202 PAR20302

PAR20301 COR203 PAR20401 PAR20402 COR204

PAR20501 PAR20502 COR205

PASW20004 PASW20002

PASW20003 PASW20001 COSW200

PATP10001 COTP100 PATP10101 COTP101

PAU100025

PAU100023

PAU100024

PAU100027

PAU100033 PAU100026

PAU100020

PAU100022

PAU100021

PAU100019

PAU100018

PAU100017 PAU100016 PAU100014 PAU100015

PAU100029 PAU100032 PAU100030 PAU100028 PAU100031 PAU10001

PAU10002

PAU100012 PAU100011 PAU100013 PAU10009 PAU100010

PAU10005

PAU10006

PAU10003

PAU10004

PAU10007

PAU10008

COU100

PAU10105 PAU10104 PAU10106 PAU10107 PAU10103 PAU10102 PAU10101 COU101

PAU10203 PAU10202

PAU10201 PAU10207 PAU10204

PAU10206

PAU10205 COU102

PAU10306

PAU10305 PAU10304 PAU10303

PAU10302 PAU10301 COU103

PAU10406

PAU10405 PAU10404 PAU10403

PAU10402 PAU10401 COU104

PAU10506

PAU10505 PAU10504 PAU10503

PAU10502 PAU10501

COU105

PAU10606

PAU10605 PAU10604 PAU10603

PAU10602 PAU10601 COU106

PAU10706

PAU10705 PAU10704 PAU10703

PAU10702 PAU10701 COU107

PAU1080A1 PAU1080A2

PAU1080B1 PAU1080B2

PAU1080C1 PAU1080C2 COU108 PAU10907

PAU10906 PAU10905 PAU10904

PAU10903 PAU10902 PAU10901 COU109

PAU20001 PAU20002 PAU20003 PAU20004 PAU20005 PAU20006 PAU20007 PAU20008 PAU20009

PAU200010

PAU200011 PAU200012 PAU200013 PAU200014

PAU200015 PAU200016 PAU200017 PAU200018 PAU200019 PAU200020 PAU200021 COU200 PAXC20002

PAXC20001 COXC200

Figure 5-2. Power Supply Block Diagram for Revision 5 of the PIC16F18446 Curiosity Nano

PIC16F18446 Curiosity NanoHardware Revision History and Known Issues


6. Document Revision HistoryDoc. rev. Date Comment

B 10/2019 Added hardware revision 7.

A 10/2018 Initial document release.

PIC16F18446 Curiosity NanoDocument Revision History


7. Appendix

7.1 SchematicFigure 7-1. PIC16F18446 Curiosity Nano Schematic

11

22

33

44

55

66

77

88

DD

CC

BB

AA

3 of

4

PIC1

6F18

446

Curio

sity

Nan

o

29/0

8/20

19PI

C16F

1844

6_C

urio

sity

_Nan

o_Ta

rget

_MCU

.Sch

Doc

Proj

ect T

itle

PCB

Ass

embl

y N

umbe

r:PC

BA R

evisi

on:

File

:PC

B N

umbe

r:PC

B Re

visio

n:

Des

igne

d wi

th

Dra

wn

By:

Mic

roch

ip N

orw

ay

Shee

t Titl

eTa

rget

MCU

Engi

neer

:H

N

A08

-286

36

Size

A3

A09

-312

07

Page

:D

ate:A

ltium

.com

32.7

68kH

z

Kyo

cera

Cor

pora

tion

ST32

15SB

3276

8C0H

PWBB

XC2

00

5pF

C203

5pF

C204

GN

D

GN

DV

CC_T

ARG

ET10

0n

C200

GN

D

32kH

z C

ryst

al

DBG0

CDC_

UART

TXRXU

ART

1kR203

USE

R L

ED

VCC

_TA

RGET

GN

D

USE

R B

UTT

ON

1kR202

YELLOWLEDSML-D12Y1WT86

2 1D200

TS604VM1-035CR13

4 2

SW20

0

CDC_TXCDC_RX

DBG2

GN

DV

CC_E

DG

E

GN

DG

ND

DBG1

DBG3

DBG2

DEB

UG

GER

CO

NN

ECTI

ON

S

10kR200

VCC

_TA

RGET

DBG1

DBG3

J209

DBG0

PIC

16F1

8446

ICSP

DA

T

ICSP

CLK

GPI

O0

MCL

R

DBG

0

DBG

1

DBG

2

DBG

3

Deb

ugge

r

CD

C T

X

CD

C R

X

UA

RT R

X

UA

RT T

X

PIC1

6F18

446

RA3_

MCL

RRA

1_IC

SPCL

K_A

NA

1

J210

J211 XOUT

XIN

RA3/

MCLR

/VPP

1RC

52

RC4

3RC

34

RC6

5

RC7 6RB7 7RB6 8RB5 9RB4 10

RC2

11RC

112

RC0

13RA

214

ICSP

CLK/

RA1

15

ICSPDAT/RA016 VSS17 VDD18 RA519 RA420

PAD

21

PIC1

6F18

446-

I/GZ

U20

0

GN

D

2.2u

FC2

05

VCC

_ED

GE

GN

D

RA0_ICSPDATRC

0_A

NC0

RC1_

AN

C1RC

2_A

NC2

_SW

RC3_

AN

C3RC

4_SP

I_M

ISO

RC5_

SPI_

MO

SI

RC6_

SPI_

SCK

RC7_SPI_SS

RA2_

AN

A2_

LED

RA4_ANA4_SOSCORA5_ANA5_SOSCI

RB4_UART_TXRB5_I2C_SDARB6_UART_RXRB7_I2C_SCL

RA4_ANA4_SOSCO

RA5_ANA5_SOSCI

RA2_ANA2_LED

RB4_

UA

RT_T

XRB

6_U

ART

_RX

RB5_

I2C_

SDA

RB7_

I2C_

SCL

RC4_

SPI_

MIS

ORC

5_SP

I_M

OSI

RC6_

SPI_

SCK

RC7_

SPI_

SSRC

0_A

NC0

RC1_

AN

C1RC

2_A

NC2

_SW

RC3_

AN

C3RA

1_IC

SPCL

K_A

NA

1RA

2_A

NA

2_LE

DRA

4_A

NA

4_SO

SCO

RA5_

AN

A5_

SOSC

I

RA1_

ICSP

CLK

_AN

A1

RA0_

ICSP

DA

TRA

3_M

CLR

RA2_

AN

A2_

LED

RB4_

UA

RT_T

XRB

6_U

ART

_RX

J207

J208

TAR

GET

BU

LK

RC2_ANC2_SW

PRO

G/D

EBU

G P

ull

47kR204

47kR205

GN

D

VTG

2.3V

- 5.

5V

VOFF

ID_S

YS

ID_SYS

VOFF

DBG

0D

BG1

CDC

RX3

CDC

TX4

DBG

15

DBG

26

0 TX

71

RX8

2 SD

A9

3 SC

L10

4 M

OSI

115

MIS

O12

6 SC

K13

7 SS

14G

ND

15

DBG

328

DBG

027

GN

D26

VCC

25

PWM

320

AD

C 2

19A

DC

118

AD

C 0

17G

ND

16

AD

C 7

24A

DC

623

AD

C 5

22PW

M 4

21

DEB

UG

GER

TARG

ET

ID2

VO

FF29

RESE

RVED

1V

BUS

30

CNA

NO

30-p

in e

dge

conn

ecto

r

J200

VBU

S

J201

J203

J205

J206

J202

J204

NC

RA

1

RA

2

RA

3

RA

0

RB4

RB6

Nam

ePi

n

Crys

tal d

atas

heet

:Cc

rysta

l = 7

pFm

ax E

SR =

70k

Ohm

Acc

urac

y ±2

0ppm

PIC1

6F18

446

data

shee

t:Cx

in =

5pF

(esti

mat

e)Cx

out =

5pf

(esti

mat

e)M

axim

um L

oad

= ?

Max

imum

ESR

= ?

Estim

ated

Cpc

b =

2pF

Estim

ated

load

C =

2 (C

crys

tal-

Cpar

a - C

pcb)

C

= 2

(7pF

- 2.

5pF

- 2pF

)C

= 5p

F

Sele

cted

in d

esig

nC

= 5p

F

NO

TE o

n U

ART

/CD

C:

RX/T

X o

n th

e he

ader

den

otes

the

inpu

t/out

put d

irect

ion

of th

e sig

nal

resp

ectiv

e to

it's

sour

ce.

CDC

TX is

out

put f

rom

the

DEB

UG

GER

.CD

C RX

is in

put t

o th

e D

EBU

GG

ER.

TX is

out

put f

rom

the

TARG

ET d

evic

e.RX

is in

put t

o th

e TA

RGET

dev

ice.

NO

TE o

n I2

C:

No

pull-

ups o

n bo

ard.

Pul

l-ups

shou

ld b

e m

ount

ed c

lose

to sl

ave

devi

ce(s

).

PIC16F18446 Curiosity NanoAppendix


11

22

33

44

55

66

77

88

DD

CC

BB

AA

2 of

4

PIC1

6F18

446

Curi

osity

Nan

o

24.0

4.20

19PI

C16F

1844

6_C

urio

sity

_Nan

o_D

EBU

GG

ER.S

chD

oc

Proj

ect T

itle

PCB

Ass

embl

y N

umbe

r:PC

BA R

evisi

on:

File

:PC

B N

umbe

r:PC

B Re

visio

n:

Des

igne

d wi

th

Dra

wn

By:

Mic

roch

ip N

orw

ay

Shee

t Titl

eD

ebug

ger

Engi

neer

:H

N

A08

-286

36

Size

A3

A09

-312

07

Page

:D

ate:A

ltium

.com

DEB

UG

GER

USB

MIC

RO

-B C

ON

NEC

TOR

GN

D

USB

D_P

USB

D_N

100n

C107

100n

C108

RXTXU

ART

CDC_

UART

1kR1

07V

CC_P

3V3

100n

C104

GN

D

SRST

STA

TUS_

LED

SHIE

LD

VBU

S

VCC

_P3V

3G

ND

TP10

0

Testp

oint

Arra

y

12

34

56

78

910

TCK

TDO

TMS

Vsu

pTD

IG

ND

TRST

SRST

VTr

efG

ND

J102

GN

D

4.7u

F

C100

DBG0

DBG

0

21

GRE

EN L

EDSM

L-P1

2MTT

86R

D10

0

VBUS

1D-

2D+

3

GND

5SH

IELD

16

SHIE

LD2

7

ID4

SHIE

LD3

8SH

IELD

49 M

U-M

B014

2AB2

-269

J105

PAD

33

PA00

1PA

012

PA02

3PA

034

GND 10VDDANA 9

PA04

5PA

056

PA06

7PA

078

PA08 11PA09 12PA10 13PA11 14PA14 15PA15 16

PA16

17PA

1718

PA18

19PA

1920

PA22

21US

B_SO

F/PA

2322

USB_

DM/P

A24

23US

B_DP

/PA2

524

PA2725 RESETN26 PA2827 GND28 VDDCORE29 VDDIN30 SWDCLK/PA3031 SWDIO/PA3132

SAM

D21

E18A

-MU

TU

100

VOUT

1

VOUT

2

GND 3

EN4

VIN

6

NC5

EP 7

MIC

5528

-3.3

YM

TU

101

VCC

_P3V

3

GN

D

USB

D_P

USB

D_N

GN

D

1uC106

VCC

_MCU

_CO

RE

VCC

_P3V

3

VCC

_P3V

3

2.2u

FC1

01

GN

D

74LV

C1T4

5FW

4-7

VCCA

1VC

CB6

A3

GND

2DI

R5

B4

U10

3V

CC_P

3V3

GN

D

74LV

C1T4

5FW

4-7

VCCA

1VC

CB6

A3

GND

2DI

R5

B4

U10

4V

CC_P

3V3

GN

D

74LV

C1T4

5FW

4-7

VCCA

1VC

CB6

A3

GND

2DI

R5

B4

U10

5V

CC_P

3V3

GN

D

GN

D GN

D

GN

D

VCC

_ED

GE

GN

D

74LV

C1T4

5FW

4-7

VCCA

1VC

CB6

A3

GND

2DI

R5

B4

U10

7V

CC_P

3V3

GN

DDB

G2

DBG

3_CT

RL

S1_0

_TX

S1_1

_RX

S0_2

_TX

DA

CV

TG_A

DC

RESE

RVED

S0_3

_CLK

DBG0_CTRL

CDC_

TX_C

TRL

BOO

T

DEB

UG

GER

PO

WER

/STA

TUS

LED

EN1

BYP

6

VOUT

4

GND

2

VIN

3

NC/A

DJ5

GND 7

MIC

5353

U10

2

100n

C102

GN

D

GN

D

47kR101

27kR104 G

ND

33k

R106

2.2u

F

C103 G

ND

1kR1

08

J100

VCC

_LEV

ELV

CC_R

EGU

LATO

R

74LV

C1T4

5FW

4-7

VCCA

1VC

CB6

A3

GND

2DI

R5

B4

U10

6V

CC_P

3V3

GN

DDB

G1

CDC_

RXCD

C_TX

DBG3

DBG1_CTRL

DEB

UG

GER

REG

ULA

TOR

REG_ENABLE

REG

_EN

ABL

E

47kR103

VCC

_LEV

EL

VCC

_LEV

EL

VCC

_LEV

EL

VCC

_LEV

EL

VCC

_LEV

EL

47kR102

47kR105

SWCL

K

GN

D

47kR100 G

ND

DBG

2

S0_0

_RX

DBG

1_CT

RL

DBG

0_CT

RL

DBG

3 O

PEN

DR

AIN

TAR

GET

AD

JUST

ABL

E R

EGU

LATO

R

SRST

DEB

UG

GER

TES

TPO

INT

DBG2_CTRL

VO

FFCD

C_RX

_CTR

L

47kR109

DBG

1

CDC_

TX_C

TRL

CDC_

RX_C

TRL

SWCL

K

REG_ADJUST

DBG2_GPIO

DBG

3_CT

RL

DBG

2_CT

RL

UPD

I

UPD

I

GPI

O

GPI

O

RESE

T

Sign

al

DBG

0

DBG

1

DBG

2

DBG

3

ICSP

Inte

rface

DA

T

CLK

GPI

O

MCL

R

DBG

3

CD

C T

X

CD

C R

X

UA

RT R

X

UA

RT T

X

UA

RT R

X

UA

RT T

X

TAR

GET

TAR

GET

1kR1

10

VBUS_ADC

1

23

DM

N65

D8L

FBQ

101

VC

C-

-

ID_S

YS

VOFF

1kR112

VCC

_P3V

3

VTG

_AD

CD

AC

MIC

9416

3

VIN

B2VO

UTA1

VIN

A2

ENC2

GND

C1VO

UTB1

U10

8

GN

D

ID_S

YS

VTG

_EN

VTG_EN

VBUS_ADC

SWD

IO

ID_S

YS

TP10

1G

ND

SWD

IO

VO

FF

47kR111 G

ND

ID P

IN

VCC

_VBU

S MC3

6213

F100

VCC

_VBU

S

VCC

_VBU

S

J101

VCC

_TA

RGET

AV

R pr

ogra

mm

ing

conn

ecto

r for

fact

ory

prog

ram

min

g of

D

EBU

GG

ER.

MIC

5528

:V

in: 2

.5V

to 5

.5V

Vou

t: Fi

xed

3.3V

Imax

: 500

mA

Dro

pout

: 260

mV

@ 5

00m

A

MIC

5353

:V

in: 2

.6V

to 6

VV

out:

1.25

V to

5.1

VIm

ax: 5

00m

AD

ropo

ut (t

ypic

al):

50m

V@

150m

A,1

60m

V @

500

mA

Acc

urac

y: 2

% in

itial

Ther

mal

shut

dow

n an

d cu

rrent

lim

it

Max

imum

out

put v

olta

ge is

lim

ited

by th

e in

put v

olta

ge a

nd th

e dr

opou

t vol

tage

in th

e re

gula

tor.

(Vm

ax =

Vin

- dr

opou

t)

J100

:Cu

t-stra

p us

ed fo

r ful

l sep

arat

ion

of ta

rget

pow

er fr

om th

e le

vel s

hifte

rs a

nd o

n-bo

ard

regu

lato

rs.

- For

cur

rent

mea

sure

men

ts us

ing

an e

xter

nal p

ower

supp

ly, t

his s

trap

coul

d be

cut f

or m

ore

accu

rate

mea

sure

men

ts. L

eaka

ge b

ack

thro

ugh

the

switc

h is

in th

e m

icro

am

pere

rang

e.

J101

:Th

is is

foot

prin

t for

a 1

x2 1

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il pi

tch

pin-

head

er th

at c

an b

e us

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r eas

y cu

rrent

mea

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men

t to

the

targ

et m

icro

cont

rolle

r and

the

LED

/ Bu

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To

use

the

foot

prin

t:- C

ut th

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ck b

etw

een

the

hole

s, an

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Adj

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out

put v

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and

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V to

the

targ

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- The

leve

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hav

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imal

vol

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and

will

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out

put s

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and

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to th

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are

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the

the

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are

feed

back

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will

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tage

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: 100

0mA



7.2 Assembly DrawingFigure 7-2. PIC16F18446 Curiosity Nano Assembly Drawing Top

PIC®MCUb


PAC10201 PAC10202 COC102

PAC10301 PAC10302 COC103

PAC10402 PAC10401 COC104


PAC10802

PAC10801 COC108 PAC20001

PAC20002 COC200


PAC20502

PAC20501 COC205

PAD10001 PAD10002 COD100

PAD20002

PAD20001 COD200

PAF10001

PAF10002 COF100

PAJ10001 PAJ10002 COJ100

PAJ10101 PAJ10102 COJ101

PAJ10201

PAJ10202

PAJ10203

PAJ10204

PAJ10205

PAJ10206 COJ102

PAJ105011

PAJ105010 PAJ10508

PAJ10509 PAJ10507

PAJ10506 PAJ10501

PAJ10502

PAJ10503

PAJ10504

PAJ10505

PAJ10500

COJ105

PAJ200028 PAJ200027

PAJ200015 PAJ200013 PAJ200012 PAJ200011 PAJ200010 PAJ20009 PAJ20008 PAJ20007 PAJ20006 PAJ20005 PAJ20004 PAJ20003 PAJ20002 PAJ20001

PAJ200018 PAJ200019 PAJ200020 PAJ200021 PAJ200022 PAJ200023 PAJ200024 PAJ200025 PAJ200026 PAJ200016 PAJ200017

PAJ200014

PAJ200029 PAJ200030 PAJ20000

COJ200

PAJ20102 PAJ20101 COJ201

PAJ20202 PAJ20201 COJ202

PAJ20302 PAJ20301 COJ203

PAJ20402 PAJ20401 COJ204 PAJ20502 PAJ20501 COJ205 PAJ20602 PAJ20601 COJ206

PAJ20702 PAJ20701 COJ207

PAJ20802 PAJ20801 COJ208

PAJ20902 PAJ20901 COJ209

PAJ21002 PAJ21001 PAJ21005 COJ210 PAJ21102 PAJ21101 PAJ21105 COJ211 COLABEL1


PAR10102 PAR10101 COR101

PAR10201 PAR10202 COR102

PAR10301 PAR10302 COR103

PAR10402 PAR10401 COR104

PAR10501

PAR10502 COR105

PAR10602 PAR10601 COR106

PAR10701 PAR10702 COR107

PAR10802 PAR10801 COR108

PAR10902


PAR11102 PAR11101 COR111

PAR11202 PAR11201 COR112

PAR20001 PAR20002

COR200

PAR20201

PAR20202 COR202 PAR20302

PAR20301 COR203

PAR20402 PAR20401 COR204

PAR20502

PAR20501 COR205

PASW20004 PASW20002



PAU10009 PAU10008 PAU10007

PAU10006

PAU10005 PAU10004

PAU10003

PAU10002

PAU10001


PAU100019

PAU100020 PAU100021

PAU100022

PAU100023

PAU100024

PAU100025 PAU100026 PAU100027 PAU100028 PAU100029 PAU100030 PAU100031 PAU100032

PAU100033 COU100

PAU10101 PAU10102 PAU10103

PAU10106 PAU10105 PAU10104

PAU10107

PAU10100 COU101 PAU10201 PAU10202 PAU10203

PAU10206

PAU10205 PAU10204

PAU10207 COU102

PAU10301

PAU10302 PAU10303 PAU10304

PAU10305 PAU10306

PAU10300 COU103

PAU10401

PAU10402 PAU10403 PAU10404

PAU10405 PAU10406

PAU10400 COU104

PAU10501

PAU10502 PAU10503 PAU10504

PAU10505 PAU10506

PAU10500 COU105

PAU10601

PAU10602 PAU10603 PAU10604

PAU10605 PAU10606

PAU10600 COU106

PAU10701

PAU10702 PAU10703 PAU10704

PAU10705 PAU10706

PAU10700 COU107

PAU1080C2 PAU1080C1 PAU1080B2 PAU1080B1

PAU1080A2 PAU1080A1 COU108


PAU200010

PAU200011 PAU200012 PAU200013 PAU200014

PAU200015 PAU200016 PAU200017 PAU200018 PAU200019 PAU200020 PAU200021 COU200 PAXC20002 PAXC20001

COXC200

Figure 7-3. PIC16F18446 Curiosity Nano Assembly Drawing Bottom

cR

t


PAC10201 PAC10202 COC102

PAC10301 PAC10302 COC103

PAC10402 PAC10401 COC104


PAC10802

PAC10801 COC108 PAC20001

PAC20002 COC200


PAC20502

PAC20501 COC205

PAD10001 PAD10002 COD100

PAD20002

PAD20001 COD200

PAF10001

PAF10002 COF100

PAJ10001 PAJ10002 COJ100

PAJ10101 PAJ10102 COJ101

PAJ10201

PAJ10202

PAJ10203

PAJ10204

PAJ10205

PAJ10206 COJ102

PAJ105011

PAJ105010 PAJ10508

PAJ10509 PAJ10507

PAJ10506 PAJ10501

PAJ10502

PAJ10503

PAJ10504

PAJ10505

PAJ10500

COJ105

PAJ200028 PAJ200027

PAJ200015 PAJ200013 PAJ200012 PAJ200011 PAJ200010 PAJ20009 PAJ20008 PAJ20007 PAJ20006 PAJ20005 PAJ20004 PAJ20003 PAJ20002 PAJ20001

PAJ200018 PAJ200019 PAJ200020 PAJ200021 PAJ200022 PAJ200023 PAJ200024 PAJ200025 PAJ200026 PAJ200016 PAJ200017

PAJ200014

PAJ200029 PAJ200030 PAJ20000

COJ200

PAJ20102 PAJ20101 COJ201

PAJ20202 PAJ20201 COJ202

PAJ20302 PAJ20301 COJ203

PAJ20402 PAJ20401 COJ204 PAJ20502 PAJ20501 COJ205 PAJ20602 PAJ20601 COJ206

PAJ20702 PAJ20701 COJ207

PAJ20802 PAJ20801 COJ208

PAJ20902 PAJ20901 COJ209

PAJ21002 PAJ21001 PAJ21005 COJ210 PAJ21102 PAJ21101 PAJ21105 COJ211 COLABEL1


PAR10102 PAR10101 COR101

PAR10201 PAR10202 COR102

PAR10301 PAR10302 COR103

PAR10402 PAR10401 COR104

PAR10501

PAR10502 COR105

PAR10602 PAR10601 COR106

PAR10701 PAR10702 COR107

PAR10802 PAR10801 COR108

PAR10902


PAR11102 PAR11101 COR111

PAR11202 PAR11201 COR112

PAR20001 PAR20002 COR200

PAR20201

PAR20202 COR202 PAR20302

PAR20301 COR203

PAR20402 PAR20401 COR204

PAR20502

PAR20501 COR205

PASW20004 PASW20002



PAU10009 PAU10008 PAU10007

PAU10006

PAU10005 PAU10004

PAU10003

PAU10002

PAU10001


PAU100019

PAU100020 PAU100021

PAU100022

PAU100023

PAU100024

PAU100025 PAU100026 PAU100027 PAU100028 PAU100029 PAU100030 PAU100031 PAU100032

PAU100033 COU100

PAU10101 PAU10102 PAU10103

PAU10106 PAU10105 PAU10104

PAU10107

PAU10100 COU101 PAU10201 PAU10202 PAU10203

PAU10206

PAU10205 PAU10204

PAU10207 COU102

PAU10301

PAU10302 PAU10303 PAU10304

PAU10305 PAU10306

PAU10300 COU103

PAU10401

PAU10402 PAU10403 PAU10404

PAU10405 PAU10406

PAU10400 COU104

PAU10501

PAU10502 PAU10503 PAU10504

PAU10505 PAU10506

PAU10500 COU105

PAU10601

PAU10602 PAU10603 PAU10604

PAU10605 PAU10606

PAU10600 COU106

PAU10701

PAU10702 PAU10703 PAU10704

PAU10705 PAU10706

PAU10700 COU107

PAU1080C2 PAU1080C1 PAU1080B2 PAU1080B1

PAU1080A2 PAU1080A1 COU108


PAU200010

PAU200011 PAU200012 PAU200013 PAU200014

PAU200015 PAU200016 PAU200017 PAU200018 PAU200019 PAU200020 PAU200021 COU200 PAXC20002 PAXC20001

COXC200



7.3 Curiosity Nano Base for Click boards™Figure 7-4. PIC16F18446 Curiosity Nano Pinout Mapping

USB

DEB

UG

GER

PIC1

6F18

446

SW0

LED

0

PS L

EDNC

NC

ID

ID

CDC RX

CDC RX

RB4

CDC TX

CDC TX

RB6

DBG1

DBG1

RA1

ICSPCLK

DBG2

DBG2

RA2

LED0

RB4

RB4

TX

RB6

RB6

RX

RB5

RB5

SDA

RB7

RB7

SCL

RC5

RC5

MOSI

RC4

RC4

MISO

RC6

RC6

SCK

RC7

RC7

SS

GND

GND

VBUS

VBUS

VOFF

VOFF

DBG3

DBG3

RA3

MCLR

DBG0

DBG0

RA0

ICSPDAT

GND

GND

VTG

VTG

RA5

RA5

ANA5

SOSCI

RA4

RA4

ANA4

SOSCO

RA2

RA2

ANA2

LED0

RA1

RA1

ANA1

PWM7

RC3

RC3

ANC3

PWM6

RC2

RC2

ANC2

SW0

RC1

RC1

ANC1

RC0

RC0

ANC0

GND

GND

PIC1

6F18

446

CURI

OSI

TY N

AN

O

Analog

Debug

I2C

SPI

UART

Shared pinout

Peripheral

Port

PWM

Power

Ground

1

AN

PWM

RST

INT

CSRX

SCK

TXM

ISO

SCL

MO

SISD

A+3

.3V

+5V

GN

DG

ND

2

AN

PWM

RST

INT

CSRX

SCK

TXM

ISO

SCL

MO

SISD

A+3

.3V

+5V

GN

DG

ND

3

AN

PWM

RST

INT

CSRX

SCK

TXM

ISO

SCL

MO

SISD

A+3

.3V

+5V

GN

DG

ND

Xpl

aine

d Pr

o Ex

tens

ion

EXT1

12

1920

Curio

sity

Nan

o Ba

sefo

r clic

k bo

ards

TM

RC0

RC3

RA5

RA4

RC7

RB6

RC6

RB4

RC4

RB7

RC5

RB5

+3.3V

+5V

GND

GND

RC1

RA1

RC6

GND

RC4

RB7

RC5

RB5

+3.3V

+5V

GND

GND

RC2

RA2

RB6

RC6

RB4

RC4

RB7

RC5

RB5

+3.3V

+5V

GND

GND

ID

GND

RC1

RC2

RA1

RA2

RB5

RB7

GND

RC5

RC4

RC6

GND

+3.3V



7.4 Connecting External DebuggersEven though there is an on-board debugger, external debuggers can be connected directly to the PIC16F18446Curiosity Nano to program/debug the PIC16F18446. The on-board debugger keeps all the pins connected to thePIC16F18446 and board edge in tri-state when not actively used. Therefore, the on-board debugger will not interferewith any external debug tools.

Figure 7-5. Connecting the MPLAB PICkit™ 4 In-Circuit Debugger/Programmer to PIC16F18446 CuriosityNano

2345678 1

MCLRVDD GroundDATACLOCK

3 = Ground

4 = PGD

5 = PGC

6 = Unused

7 = Unused

8 = Unused

2 = VDD

1 = MCLR

MPLAB® PICkit™ 4

USB

DEBUGGER

PS LEDNC

ID

CDC RX

CDC TX

DBG1

DBG2

VBUS

VOFF

DBG3

DBG0

GND

VTGCURIOSITY NANO

CAUTIONThe MPLAB PICkit 4 In-circuit Debugger/Programmer is capable of delivering high voltage on the MCLRpin. R110 can be permanently damaged by the high voltage. If R110 is broken, the on-board debugger cannot enter programming mode of the PIC16F18446, and will typically fail at reading the device ID.

CAUTIONTo avoid contention between the external debugger and the on-board debugger, do not start anyprogramming/debug operation with the on-board debugger through MPLAB® X IDE or mass storageprogramming while the external tool is active.



The Microchip WebsiteMicrochip provides online support via our website at http://www.microchip.com/. This website is used to make filesand information easily available to customers. Some of the content available includes:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’sguides and hardware support documents, latest software releases and archived software

• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, onlinediscussion groups, Microchip design partner program member listing

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To register, go to http://www.microchip.com/pcn and follow the registration instructions.

Customer SupportUsers of Microchip products can receive assistance through several channels:

• Distributor or Representative• Local Sales Office• Embedded Solutions Engineer (ESE)• Technical Support

Customers should contact their distributor, representative or ESE for support. Local sales offices are also available tohelp customers. A listing of sales offices and locations is included in this document.

Technical support is available through the website at: http://www.microchip.com/support

Microchip Devices Code Protection FeatureNote the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.• Microchip believes that its family of products is one of the most secure families of its kind on the market today,

when used in the intended manner and under normal conditions.• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these

methods, to our knowledge, require using the Microchip products in a manner outside the operatingspecifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft ofintellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code

protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protectionfeatures of our products. Attempts to break Microchip’s code protection feature may be a violation of the DigitalMillennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, youmay have a right to sue for relief under that Act.

Legal NoticeInformation contained in this publication regarding device applications and the like is provided only for yourconvenience and may be superseded by updates. It is your responsibility to ensure that your application meets with



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The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks ofMicrochip Technology Inc. in other countries.

GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of MicrochipTechnology Inc., in other countries.

All other trademarks mentioned herein are property of their respective companies.© 2019, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.

ISBN: 978-1-5224-5112-9

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PrefaceTable of Contents1. Introduction1.1. Features1.2. Kit Overview

2. Getting Started2.1. Curiosity Nano Quick Start MPLAB® Xpress2.2. Curiosity Nano Quick Start2.3. Design Documentation and Relevant Links

3. Curiosity Nano3.1. On-board Debugger3.1.1. Virtual COM Port (CDC)3.1.1.1. Overview3.1.1.2. Limitations3.1.1.3. Signaling3.1.1.4. Advanced Use

3.1.2. Mass Storage Disk3.1.2.1. Mass Storage Device3.1.2.2. Configuration Words

3.2. Curiosity Nano Standard Pinout3.3. Power Supply3.3.1. Target Regulator3.3.2. External Supply3.3.3. VBUS Output Pin

3.4. Target Current Measurement3.5. Disconnecting the On-Board Debugger

4. Hardware User Guide4.1. Connectors4.1.1. PIC16F18446 Curiosity Nano Pinout4.1.2. Using Pin Headers

4.2. Peripherals4.2.1. LED4.2.2. Mechanical Switch4.2.3. Crystal

4.3. On-Board Debugger Implementation4.3.1. On-Board Debugger Connections

5. Hardware Revision History and Known Issues5.1. Identifying Product ID and Revision5.2. DAC pin limitations5.3. Revision 75.4. Revision 5

6. Document Revision History7. Appendix7.1. Schematic7.2. Assembly Drawing7.3. Curiosity Nano Base for Click boards™7.4. Connecting External Debuggers

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Microchip Technology - PIC16F18446 Curiosity Nano Hardware …ww1.microchip.com/downloads/en/DeviceDoc/50002808B.pdf · 2019-10-08 · PIC16F18446 Curiosity Nano PIC16F18446 Curiosity