dsPIC33CH Curiosity Development Board User’s GuidedsPIC33CH CURIOSITY DEVELOPMENT BOARD USER’S GUIDE 2018 Microchip Technology Inc. Advance Information DS50002762A-page 5 Preface

2018 Microchip Technology Inc. Advance Information DS50002762A

dsPIC33CH CuriosityDevelopment Board

User’s Guide

DS50002762A-page 2 Advance Information 2018 Microchip Technology Inc.

Information contained in this publication regarding deviceapplications and the like is provided only for your convenienceand may be superseded by updates. It is your responsibility toensure that your application meets with your specifications.MICROCHIP MAKES NO REPRESENTATIONS ORWARRANTIES OF ANY KIND WHETHER EXPRESS ORIMPLIED, WRITTEN OR ORAL, STATUTORY OROTHERWISE, RELATED TO THE INFORMATION,INCLUDING BUT NOT LIMITED TO ITS CONDITION,QUALITY, PERFORMANCE, MERCHANTABILITY ORFITNESS FOR PURPOSE. Microchip disclaims all liabilityarising from this information and its use. Use of Microchipdevices in life support and/or safety applications is entirely atthe buyer’s risk, and the buyer agrees to defend, indemnify andhold harmless Microchip from any and all damages, claims,suits, or expenses resulting from such use. No licenses areconveyed, implicitly or otherwise, under any Microchipintellectual property rights unless otherwise stated.

Note 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 operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual 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 protection features of ourproducts. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such actsallow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV

== ISO/TS 16949 ==

Trademarks

The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings, BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.

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

All other trademarks mentioned herein are property of their respective companies.

© 2018, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 978-1-5224-3181-7

dsPIC33CH CURIOSITY DEVELOPMENTBOARD USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 5

Chapter 1. Introduction................................................................................................ 111.1 Schematics and Bill of Materials (BOM) ....................................................... 12

Chapter 2. Hardware .................................................................................................... 132.1 Powering the Board ...................................................................................... 13

2.1.1 USB Power ................................................................................................ 132.1.2 External Power .......................................................................................... 13

2.2 Using the Programmed Demo Firmware ...................................................... 142.3 Reprogramming and Debugging the dsPIC33CH128MP508 Device (U1) ...... 142.4 Using the Isolated USB-UART Interface ...................................................... 152.5 Circuit Details ............................................................................................... 15

2.5.1 Jumpers/Headers/Connectors ................................................................... 152.5.2 SMPS Hardware Overcurrent Protection ................................................... 162.5.3 SMPS Hardware Overvoltage Protection .................................................. 172.5.4 PWM DAC/DC Bias Generator .................................................................. 172.5.5 Transient Load Tester Circuit .................................................................... 18

2.6 Low-Side Current Sensing ........................................................................... 192.7 High-Side Current Sensing ........................................................................... 20

Appendix A. Schematics ............................................................................................. 21

Appendix B. Bill of Materials....................................................................................... 27

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

2018 Microchip Technology Inc. Advance Information DS50000000A-page 3

dsPIC33CH Curiosity Development Board User’s Guide

NOTES:


dsPIC33CH CURIOSITY DEVELOPMENT
BOARD USER’S GUIDE
Preface

INTRODUCTION

This preface contains general information that will be useful to know before using the dsPIC33CH Curiosity Development Board. Topics discussed in this preface include:

• Document Layout• Conventions Used in this Guide• Recommended Reading• Recommended Reading• The Microchip WebSite• Development Systems Customer Change Notification Service• Customer Support• Document Revision History

DOCUMENT LAYOUT

This user’s guide provides an overview of the dsPIC33CH Curiosity Development Board. The document is organized as follows:

• Chapter 1. “Introduction” – This chapter introduces the dsPIC33CH Curiosity Development Board and provides a brief overview of its features.

• Chapter 2. “Hardware” – This chapter describes some of the noteworthy hardware features of the board.

• Appendix A. “Schematics” – This appendix provides schematic diagrams for the dsPIC33CH Curiosity Development Board.

• Appendix B. “Bill of Materials (BOM)” – This appendix provides the component list used in assembling the board.

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our website (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXXXXA”, where “XXXXXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB® IDE on-line help. Select the Help menu, and then Topics to open a list of available on-line help files.


http://www.microchip.com


CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or dialog

“Save project before build”

Underlined, italic text with right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format, where N is the total number of digits, R is the radix and n is a digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file [options]

Curly braces and pipe character: { | }

Choice of mutually exclusive arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [, var_name...]

Represents code supplied by user

void main (void){ ...}


Preface

RECOMMENDED READING

This user’s guide describes how to use the dsPIC33CH Curiosity Development Board. The device-specific data sheets contain current information on programming the specific microcontroller or Digital Signal Controller (DSC) devices. The following Microchip documents are available and recommended as supplemental reference resources:

MPLAB® XC16 C Compiler User’s Guide (DS50002071)

This comprehensive guide describes the usage, operation and features of Microchip’s MPLAB XC16 C compiler (formerly MPLAB C30) for use with 16-bit devices.

MPLAB® X IDE User’s Guide (DS50002027)

This document describes how to set up the MPLAB X IDE software and use it to create projects and program devices.

dsPIC33CH128MP508 Family Data Sheet (DS70005319)

Refer to this document for detailed information on the dsPIC33CH Dual Core Digital Signal Controllers (DSCs). Reference information found in this data sheet includes:

• Device memory maps

• Device pinout and packaging details

• Device electrical specifications

• List of peripherals included on the devices

dsPIC33/PIC24 Family Reference Manual Sections

Family Reference Manual (FRM) sections are available, which explain the operation of the dsPIC® DSC MCU family architecture and peripheral modules. The specifics of each device family are discussed in the individual family’s device data sheet.



THE MICROCHIP WEBSITE

Microchip provides online support via our website at www.microchip.com. This website is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the website contains the following information:

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

• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing

• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest.

To register, access the Microchip website at www.microchip.com, click on Customer Change Notification and follow the registration instructions.

The Development Systems product group categories are:

• Compilers – The latest information on Microchip C compilers and other language tools. These include the MPLAB® C compiler; MPASM™ and MPLAB 16-bit assemblers; MPLINK™ and MPLAB 16-bit object linkers; and MPLIB™ and MPLAB 16-bit object librarians.

• Emulators – The latest information on the Microchip MPLAB REAL ICE™ in-circuit emulator.

• In-Circuit Debuggers – The latest information on the Microchip in-circuit debugger, MPLAB ICD 4.

• MPLAB X IDE – The latest information on Microchip MPLAB X IDE, the Windows® Integrated Development Environment for development systems tools. This list is focused on the MPLAB X IDE, MPLAB SIM simulator, MPLAB X IDE Project Manager and general editing and debugging features.

• Programmers – The latest information on Microchip programmers. These include the MPLAB PM3 device programmer and the PICkit™ 3 development programmers.


Preface

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.

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

DOCUMENT REVISION HISTORY

Revision A (June 2018)

This is the initial released version of this document.



NOTES:



Chapter 1. Introduction

The dsPIC33CH Curiosity Development Board (DM330028) is intended as a cost-effective development and demonstration platform for the dsPIC33CH128MP508 family of dual core, high-performance Digital Signal Controllers. Some of the board hardware features are highlighted in Figure 1-1.

FIGURE 1-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD

Hardware Features:

1. dsPIC33CH128MP508 dual core, 16-bit DSP target device.

2. Integrated PICkit™-On-Board (PKOB) programmer/debugger.

3. 2x mikroBUS™ interfaces for hardware expansion, compatible with a wide range of existing click boards™ from MikroElektronika (www.mikroe.com).

4. 1x Red/Green/Blue (RGB) LED.

5. 2x general purpose red indicator LEDs.

6. 3x general purpose push buttons.

7. 1x MCLR Reset push button.

8. 10k potentiometer.

9. Galvanically isolated USB-UART interface, capable of up to 460,800 baud.

10. Female, 100 mil pitch, I/O pin access headers for probing and connecting to all target microcontroller GPIO pins.

11. Configurable Switch Mode Power Supply (SMPS) test circuit that can be operated in Buck, Boost, or Buck-Boost modes, using either Voltage mode or Peak Current mode control.

12. Converter output voltage screw terminal.

13. Configurable load step transient generator.

14. General purpose through-hole and SMT prototyping area.

3

514

13

11

6

1010

1

5

4

8

7

9

2

12


http://www.mikroe.com

http://www.mikroe.com


1.1 SCHEMATICS AND BILL OF MATERIALS (BOM)

Schematics and the BOM for the dsPIC33CH Curiosity Development Board are located in Appendix A. “Schematics” and Appendix B. “Bill of Materials (BOM)”, respectively.


dsPIC33CH CURIOSITY DEVELOPMENT
BOARD USER’S GUIDE
Chapter 2. Hardware

2.1 POWERING THE BOARD

2.1.1 USB Power

The board is intended to be primarily powered from the PKOB USB micro-B connector J20. Power is not sourced through USB connector J16, as it is part of the isolated USB-UART interface. The official “USB 2.0 Specification” restricts USB applications to consuming no more than 500 mA of USB VBUS power from the host. Polyfuse TH1 is rated for 500 mA to enforce the USB current restrictions and to help protect the board, or host, from damage in the event of unintended short circuits or SMPS output overloads.

When operating the board from USB power, approximately 300 mA of VBUS current is available to the SMPS circuit, as about 200 mA of the total should be reserved for use by the other non-SMPS circuitry on the board (ex: primarily U1, U4, U11, R17, LED5, etc.).

2.1.2 External Power

An external DC wall cube may optionally be connected if a DC barrel jack is installed in the unpopulated footprint J17. If an external wall cube is used, it should be well regulated and rated for 5.0V, ≤1.5A, with center pin positive. Compared to operating from USB power, powering the board with an external wall cube enables more power to be sourced by the SMPS circuit on the board. It is not necessary to use an external power supply for standard operation at lower current levels (e.g., SMPS circuit output load power of about <1.2W).

When the board is powered through J17, the polyfuse TH1 is bypassed, and therefore, it is recommended to use a wall cube with internal short circuit and overload protection (≤1.5A) to minimize the risk of circuit damage in the event of unintended short circuits. Additionally, if an external wall cube is used, it is recommended to cut a trace (NT2 on the top of the PCB) and populate D1 with a ≥1A rated Schottky diode (SOD-123). This will prevent any USB VBUS “backdrive” current from flowing out of the wall cube and into the attached host via J20. USB VBUS backdrive currents may not necessarily be destructive (when limited in current level), but are a USB compliance violation. They can interfere with the host operation, especially when the host is unpowered. This scenario can be avoided, however, via D1.



DS

2.2 USING THE PROGRAMMED DEMO FIRMWAREThe development board comes programmed with some basic demo firmware, which exercises several of the board hardware features. For details on how to use the programmed demo firmware, please refer to the documentation associated with the source code for the demo, which can be obtained from:

www.microchip.com/dspic33chcuriosity

2.3 REPROGRAMMING AND DEBUGGING THE dsPIC33CH128MP508 DEVICE (U1)The board has a PICkit-On-Board (PKOB) programmer/debugger circuit, which can be used to program and debug both the Master and Slave cores in the dsPIC33CH128MP508 target device (U1). Alternatively, an external programmer/debugger tool can be connected to the board via the 6-pin inline connector J2, using a male-male 100 mil pitch 6-pin header.

During simultaneous “dual debug” of both the Master and Slave cores, two debugger tools are required. During simultaneous dual debug operation, the PKOB circuit can be used to debug the Master core, while an external programmer/debugger tool should be connected via the 6-pin 100 mil pitch connector J15 using a male-male header. Two programmer/debugger tools are only required when performing dual core simultaneous debug operations. When programming or debugging only a single core (either Master or Slave) at a time, the on-board PKOB circuit is sufficient.

The PKOB circuit should automatically enumerate and be recognized by the MPLAB® X IDE v4.10 or later, when the Curiosity Board is connected to the host via the USB micro-B connector J20. No custom USB driver installation is necessary as the PKOB circuit relies on standard OS provided HID drivers, and therefore, driver instal-lation should be fully automatic. When plugged in, the PKOB programmer/debugger tool can be selected from the MPLAB X project properties page by selecting the device under: Hardware Tools>Microchip Starter Kits>Starter Kits (PKOB)>dsPIC33CH Curio…, as shown in Figure 2-1.

FIGURE 2-1: dsPIC33CH CURIOSITY PKOB TOOL SELECTION

50002762A-page 14 Advance Information 2018 Microchip Technology Inc.

www.microchip.com/dspic33chcuriosity

Hardware

2.4 USING THE ISOLATED USB-UART INTERFACE

The board implements a galvanically isolated USB-UART interface based around the MCP2221A chip. The MCP2221A implements the standard Communication Device Class (CDC) – Abstract Control Model (ACM) protocol, and therefore, can use standard USB drivers that are provided with modern Windows®, Mac® and Linux® operating systems. Under most operating systems, the USB driver installation will be fully auto-matic. Under certain older operating systems, or if the device is attached to an older than Windows 10 machine without an active internet connection, manual installation of the drivers may be necessary. In this case, the driver package can be downloaded from:

www.microchip.com/mcp2221a

Details on how to access the serial port from Mac and Linux operating systems can also be found in the associated collateral for the MCP2221A. Under Windows, after successful USB driver installation, the device will appear as a “COMx” port object, which standard serial terminal programs can open/read/write to and from.

2.5 CIRCUIT DETAILS

Some of the circuit blocks in the schematics may not have immediately obvious purpose or method of operation. This section highlights some of these circuit elements and provides an explanation for their intent and function.

2.5.1 Jumpers/Headers/Connectors

J1 – This is an unpopulated 2-pin, 100 mil jumper header, which may optionally be used to insert a current meter in series with the U1 VDD current path to measure the micro-controller current consumption. In order to measure the U1 current, the trace on the bottom of the PCB, that shorts the two pins of J1, should be cut and a 2-pin jumper should be soldered into J1.

J2 – This is an unpopulated 6-pin staggered header interface, which can optionally be used to connect an external programmer/debugger tool to the target microcontroller U1. Ordinarily, it is not necessary to use J2, since the integrated programmer/debugger (PKOB) circuit connects to the same U1 program/debug interface pins.

J3 – This is a female header that implements the mikroBUS Interface A, which can be used to attach hardware daughter boards to expand the functionality of the development board.

J8 – This is a female header that implements the mikroBUS Interface B, which can be used to attach hardware daughter boards to expand the functionality of the development board.

J10 – This jumper sets the -3 dB low-pass filter breakpoint frequency of the RC network, composed of R54 + C26/C41. When the jumper is open, the low-pass filter frequency is around 15.9 kHz, but with the jumper capped, it is around 1.4 kHz. When a sufficiently high-frequency PWM waveform is generated on RC5, the low-pass filter can smooth it into a near DC value, which is buffered by op amp U8, providing a software controlled DAC capability.

J11 – This is a female I/O pin access header used for accessing the U1 microcontroller I/O pins.

J12 – This is a female I/O pin access header used for accessing the U1 microcontroller I/O pins.


www.microchip.com/mcp2221a


J13 – This jumper sets the effective resistor divider feedback ratio for the SMPS output voltage when it is measured by the U1 ADC. When the SMPS is used to generate rel-atively low voltages (ex: 0V-6.5V), it is suggested to keep J13 capped to maximize feedback circuit sensitivity. When the SMPS will be used to generate voltages above 6.5V, J13 should be opened to ensure the feedback voltage stays within the input sensing range of the ADC.

J14 – This is an unpopulated 2-pin jumper location that can be used to disconnect the SMPS transient generator circuitry from the output of the SMPS circuit. In order to disconnect the transient generator circuit, it is suggested to populate J14 with a 2-pin jumper header and to cut the trace (NT5) on the bottom of the PCB linking the pins of J14.

J15 – This is an unpopulated 6-pin staggered header interface that can optionally be used to connect an external programmer/debugger tool to the target microcontroller U1 when performing dual simultaneous debug of both the Master and Slave cores. The J15 header connects to the Slave debug port, S1PGx3, and is only intended for use during dual debug operations. For single core debug of either the Master or Slave, either J2 or the PKOB circuit should be used. The holes for J15 are slightly staggered, which provides some friction retention force, without requiring physical soldering, when a straight male-male or right angle male-male header is installed in J15.

J16 – This is a standard female USB micro-B connector, which connects to the MCP2221A USB-UART converter chip. This USB interface is a data interface only, as it is galvanically isolated from the rest of the application circuitry and does not supply power to the rest of the board.

J17 – This is an unpopulated footprint that may optionally be used to install a standard DC barrel jack for externally powering the board from a regulated 5.0V wall cube.

J18 – This is a female I/O pin access header for accessing certain U1 microcontroller I/O pins, along with the various power rails implemented on the development board.

J19 – This is an unpopulated 2-pin jumper header, that may optionally be used as an attachment point for connecting an external frequency response analyzer tool, for measuring the SMPS control loop phase/gain characteristics. The 20 Ohm load resistor (R96) is connected directly across the J19 pins.

J20 – This is a standard female USB micro-B connector that is intended to be used to power the board and provide a USB communication path when using the integrated programmer/debugger (PKOB) circuit.

J21 – This is a 2-pin screw terminal that provides access to the SMPS VOUT and GND nets. This is a convenient place for attaching external loads that may be powered by the SMPS circuit.

2.5.2 SMPS Hardware Overcurrent Protection

The components, Q11, C22, R67, U10, and the high-side current sense resistors, R59 + R74, implement a crude form of hardware-based overcurrent protection. In a normal/real application SMPS design, overcurrent protection is often provided through the use of comparator(s), which would typically be implemented using the comparators and DACs inside the microcontroller. However, during initial firmware development, the code for enabling the DACs + comparators may not have been written and debugged yet, at the time of, say, accidentally dropping an oscilloscope ground lead onto the demo board. This could result in an unanticipated random short circuit. In these scenarios, the hardware overcurrent protection circuit implemented by Q11, U10 and surrounding components can potentially help protect the circuit from damage.


Hardware

During an overcurrent condition, when the current through R59 + R74 starts to exceed approximately 1.2A (ex: 600 mV sense voltage), the base of Q11 will become forward biased and it will begin to turn on. This will quickly charge the capacitor C22 to the Schmitt trigger VIH input logic high threshold of the U10 logic chip (which is configured as a Schmitt trigger OR gate). Once the VIH level is reached, the U10 output will go high (independent of the RC14_S1PWM7H signal), thus turning off the high-side P-channel MOSFET Q6.

At this point, the current through Q6 will drop to zero, Q11 will turn off, but C22 will remain charged near the VIH level until it is eventually bled down to the VIL level through R67. The U10 output will not immediately switch back on due to the Schmitt trigger hysteresis voltage between the VIH and VIL input thresholds of U10. It takes approxi-mately 40% of an RC time constant (between C22 + R67) for the VIL threshold to be reached, which enforces a minimum Q6 off time of roughly 80 µs. This delay is suffi-cient for the L1 inductor current to drop all the way to zero due to the energy loss in the diodes D2, D5 and the resistance in the freewheeling current path.

Therefore, even during short-circuit conditions with improperly implemented firmware control signals, the average current can be maintained at a reasonably safe level. Once the firmware for enabling and using the internal U1 comparators and DACs has been developed/debugged, it is expected that the Q11 and related hardware overcurrent protection components would be omitted, since they would become somewhat redundant in the final application design.

2.5.3 SMPS Hardware Overvoltage Protection

The components, Q7, C15, R64, R65, R66 and U5, implemented a hardware-based output overvoltage protection feature in a manner similar to the hardware overcurrent protection circuit. When a conventional boost converter is operated open loop without enough load on the output, the output voltage can theoretically rise to an indeterminate high level, which can potentially avalanche the output Schottky diode, the boost MOSFET or the output capacitors.

When the output voltage rises above approximately 16V, the output of the resistor divider (R65 + R66) will become high enough to begin forward biasing the Q7 base and turning on the transistor. This will quickly discharge C15 from 3.3V down to the VIL Schmitt trigger input threshold of the Schmitt AND gate implemented by U5. This over-rides the PWM control signal and shuts down Q2 until such time as the output overvoltage condition has decayed away, and enough time has elapsed for R64 to charge C15 back up to the VIH Schmitt trigger input threshold of U5 (automatically re-enabling PWM activity on Q2).

In a typical/real SMPS application, the closed-loop output feedback control loop would normally be responsible for preventing output overvoltage conditions from occurring. However, during initial firmware development, the closed-loop control algorithms may not yet be fully implemented and operational (or may be halted from normal operation, for example, due to hitting a debug breakpoint in the firmware). In these scenarios, the hardware output overvoltage protection circuitry can help to prevent potential circuit damage.

2.5.4 PWM DAC/DC Bias Generator

The RC5_S1PWM2L net is intended to be driven with a fixed frequency PWM wave-form. The low-pass filter, consisting of R54 + C26 (and C41 when jumper J10 is capped), averages the PWM waveforms, and for a high PWM frequency, generates an adjustable DC voltage. Op amp U8 buffers the DC voltage, providing a low-impedance firmware adjustable DAC, where the output voltage is based on the PWM duty cycle provided to the circuit.



2.5.5 Transient Load Tester Circuit

The MOSFET Q8 and surrounding components implement an adjustable constant-current sink that can be periodically pulsed on for a few milliseconds at a time to generate momentary SMPS output load transient pulses. During control loop firm-ware development, it is often desirable to study the control system behavior in response to large signal step changes.

By monitoring the SMPS output voltage waveforms in response to the load step transient event, one can get an idea of the real world output voltage undershoot during the transient and the subsequent overshoot that will occur after the transient load is rapidly removed. Additionally, the transient response recovery waveform shapes can also provide hints as to likely control loop stability and approximate phase margin.

Load step transient response curves exhibiting damped sinusoidal oscillating output voltage, that takes a long time to recover to steady-state DC values, implies a control loop with low phase margin, while an over damped RC-like recovery waveform implies higher phase margin.

When the RC13_TRANSIENT logic signal is driven high, the MOSFET Q8 will begin to turn on through the gate resistor R79. However, as the gate voltage rises, current will begin to flow through the MOSFET and current sense resistor R94, which will create a voltage that is sensed by Q9. When the voltage at the base of Q9 is sufficient to turn it on, it will begin sinking current from the gate of Q8, preventing the gate voltage from rising further and maintaining MOSFET Q8 in the linear region, where it behaves like a voltage controlled constant-current sink.

Components, R83 and C40, provide compensation for the MOSFET Q8 gate waveform to ensure small signal stable regulation of the constant current. The relative sizes of R79 and R87 set the DC gain of the constant-current regulation control loop.

The value of current sense resistor R94 sets the current limit, but it is made adjustable by biasing the base of Q9, up or down, via the resistor dividers R84 and R85. When the S1PWM2L_DAC_ISET DC voltage level is high (e.g., near 3.3V), Q9 will always be turned on, even with no current through R94 due to the resistor divider output (of R84 + R85) being higher than the turn-on voltage of the BJT Q9. Conversely, when the S1PWM2L_DAC_ISET DC voltage is low (e.g., near 0.0V), this decreases the voltage appearing on the Q9 base, requiring larger currents through R94 before the MOSFET Q8 gate voltage becomes limited.

Adjusting the PWM waveform duty cycle on RC5_S1PWM2L by +1.0% alters the Q8 constant-current sink value by approximately -12 mA. At 50% PWM duty cycle, the approximate current sink level is around 390 mA, but will vary somewhat between boards and at different ambient temperatures, as these will affect the Q9 turn-on voltage. For exact current sink values, it is necessary to use closed-loop control by measuring the RA2_TRANSIENTFB current sense voltage with the ADC at run time. Then, using the resulting value to fine-tune adjust the PWM duty cycle on RC5_S1PWM2L.

Since Q8 is driven in the linear region during the transient pulse, the instantaneous power dissipation within the MOSFET can be quite high, potentially up to 15W if the circuit is configured for 15V output and 1A pulse load current. This power dissipation level cannot be sustained indefinitely without a substantial heat sink, but for short pulses (ex: ≤100 ms based on the safe operating area graph in the MCP87130T MOSFET data sheet), the thermal inertia of the MOSFET die and package allow the junction temperature to stay below the 150ºC maximum of the device. However, in between pulses, enough time must be allowed for the die and package to cool back to room temperature, before the next pulse, in order to ensure reliable operation of the circuit. It is therefore recommended to control RC13_TRANSIENT, so as to generate short pulses (ex: ≤10 ms) with long off times between pulses (ex: pulse rate of ~5 Hz).


Hardware

In the event of improper firmware control of the RC13_TRANSIENT net (e.g., DC logic high or high time pulses > 10 ms), Q8 would potentially experience high sustained power dissipation, and unless protected somehow, would be vulnerable to thermal failure. To prevent this scenario, components, Q10, R88, C51, R90 and R91, imple-ment a crude maximum on-time restricting sub-circuit, which is intended to limit the Q8 on time to roughly 10 ms maximum.

When RC13_TRANSIENT goes high, C51 begins charging through R88 and will eventually reach approximately 2x the VBE forward voltage necessary to turn on Q10. At this point, the output voltage of the resistor dividers, R90 and R91, rises high enough that Q10 begins turning on, sinking current/voltage away from the gate of Q8 and even-tually turning off the MOSFET Q8. When RC13_TRANSIENT is eventually driven logic low, C51 discharges through R90 and R91, resetting the circuit automatically.

2.6 LOW-SIDE CURRENT SENSING

During Buck mode operation, it is sometimes desirable to be able to measure the current during the off time of MOSFET Q6 if implementing some form of “peak valley” or Average Current mode control algorithm. Low-side current sensing during the MOSFET off time is possible via the current sense resistors, R63, R92 and R93. How-ever, the voltage developed across the current sense resistors will be a negative voltage with respect to ground. The signal is therefore connected to the inverting input of one of the PGAs in the microcontroller, which can then be used to invert and amplify the negative voltage into a positive voltage that can be measured by the ADC or used by a comparator inside the device.

When supplying a negative input voltage to the PGA, it is important to maintain the I/O pin voltage within the absolute maximum ratings from the device data sheet, which allows for negative voltages only within VSS to (VSS – 300 mV) range. Therefore, Schottky diode D9 and resistor R95 are used to clamp the negative voltages to within the 0V to -300 mV range. However, it is important to be aware that the inverting inputs to the PGAs on the device have approximately 10k typical input impedance from the device data sheet, and therefore, the resistance of R95 will reduce the gain of the amplifier for a given PGA setting. Such that, in this configuration, the firmware should not rely on the absolute output voltage of the PGA to reflect the true current through the sense resistors, unless the overall gain of the complete circuit is directly measured and factored into the computations in the firmware.



2.7 HIGH-SIDE CURRENT SENSING

The SMPS on-time current can be measured by the voltage developed across the high-side current sense resistors, R59 and R74. However, the ISENSEH signal is referenced to the +5V input rail of the SMPS circuit (not to ground), which prevents it from being measured directly by the ADC or comparators in the microcontroller U1. Therefore, the ISENSEH voltage signal is level shifted (to be ground referenced) and amplified by the components, U7A, Q1, R52 and R98, with an effective gain of 3.3.

Components, R97 and R102, add a small DC bias (approximately -71 mV, before level shifter gain or about +235 mV at RA3_ISENSEH), which appears at the RA3_ISENSEH microcontroller pin as an intentional offset error in the current measurement. This intentional DC biasing ensures that the current sense voltage signal is always within the U1 comparator input sensing range and the internal DAC reachable range, even when the Q6 current is exactly 0.0 mA with realistic comparator and DAC offset voltages.

The final output voltage on RA3_ISENSEH is related to the Q6 current approximately, as shown in Equation 2-1 and Equation 2-2 (where RA3_ISENSEH is the voltage in volts measurable with the microcontroller ADC; VIN is the +5V rail input voltage, which may be ~4.6V under load during operation and IQ6 is the current through the MOSFET Q6 in amps). Equation 2-1 and Equation 2-2 were derived by simplifying and substitut-ing resistor values into Equation 2-3 through Equation 2-6, which in turn, were derived from the schematic implementation.

EQUATION 2-1:

EQUATION 2-2:

EQUATION 2-3:

EQUATION 2-4:

EQUATION 2-5:

EQUATION 2-6:

RA3_ISENSEH 0.04877 • VIN + 1.626 • IQ6

RA3_ISENSEH – 0.04877 • VINIQ6 1.626

Rsense = = 0.5 Ohms1R59

1R74+

–1

ISENSEH_BIASED = (VIN – IQ6 • Rsense) R102(R102 + R97)

RA3_ISENSEH = R98R52 (VIN – ISENSEH_BIASED)

RA3_ISENSEH = R98R52 [ ](VIN – IQ6 • Rsense)(R102)

R102 + R97

VIN –



Appendix A. Schematics

The schematics for the dsPIC33CH Curiosity Development Board (DM330028) are shown in Figure 1 through Figure 4.


dsP

IC33C

H C

urio

sity Develo

pm

ent B

oard

User’s G

uid

e

DS

50

00

27

62

A-p

ag

e 2

2A

dv

anc

e In

form

atio

n

20

18

Micro

chip

Te

chn

olo

gy In

c.

Designed with

Altium.com

RB0_OSCI

820R06031%

R9

820R06031%

R1 0

1 4

2 3

S2

1 4

2 3

S1

10k1%

R3

10k1%

R1

3V3

3

3

RE0_LED1

RE1_LED2

RED

LED1

RED

LED2

2 1

43

GR

EENRED

BLU

E

5 6

L E D3

LED_RGB

14

23

S4

3

4.7k06031%

R7

123 4

56

SC-70

123 4

56

SOT-23

Prototyping Area

G eneral Purpose LEDs

RGB LED

Buttons

P otentiometer

8 MHz Oscillator

21

3

10k

20%

R17

3V3

n

MCLRReset Button

10k1%

R5

1 4

2 3

S3

3

0.1 μF25V0603

C2

RA0_POT270R1%

R16

0.1 μF25V0603

C1

STB1

GND2 OUT 3VDD4

DS C 6011J I1A-008.0000

X 1

FIGURE A-1: dsPIC33CH CURIOSITY BOARD SCHEMATIC REV. 1.0 (SHEET ONE OF FOUR)

Pin

70

Pin

26

Pin

50

3V3

3V

3V

RD5_RGB_RED

RD7_RGB_GREEN

RB14_RGB_BLUE

Pin

51

Pin

71

Pin

25

12DNP

J 1

Net Tie

NT1

U1VDD

U1VDD

RB4_PGC2RB3_PGD2

3V3

VPP/MCLRVDD

GND

ICSPCLKNC

ICSPDAT

123456

HDR-2.54 Male 1x6 STAGGERED

DNP

J2

1k06031%

R8

3V

Currentmeasurement point

(Local VDD/VSS bypass/decoupling for U1)

MCLR

RE7_S1

RE8_S2

MCLR

MCLR

Pin

25Pi

n 26

RD0_RXA

3V3

I2C Pull-ups (DNP)Note: Not populated, typically installed omikroBUS daughter boards instead.

RB8_SCLB

RB9_SDAB

DNPR21

DNPR22

mikroBUS™ Interface AAN1

RST2

CS3

SCK4

MISO5

MOSI6

+3.3V7

GND8

PWM 16

INT 15

RX 14

TX 13

SCL 12

SDA 11

+5V 10

GND 9

J3

3V3

RD4_RSTA

RD1_TXARD0_RXA

RE13_SDAARE12_SCLARD6_MISOA

RC3_MOSIA

RB10_SCKA

RC7_ANA RB15_PWMARD2_INTA

RD3_CSA 1k

R14

AN1

RST2

CS3

SCK4

MISO5

MOSI6

+3.3V7

GND8

PWM 16

INT 15

RX 14

TX 13

SCL 12

SDA 11

+5V 10

GND 9

J 8

mikroBUS™ Interface B

3V3

RB7_CSBRC6_RSTB

RB9_SDABRB8_SCLBRC11_TXB

RC10_RXB

RC9_MISOB

RB2_ANB

RD8_MOSIB

RC4_PWMBRB13_INTB

RC8_SCKB

1kR19

U1VDD

RE9_S3

3VRD1_TXARD2_INTARD3_CSARD4_RSTA

RD6_MISOA

RD8_MOSIB

RE0_LED1RE1_LED2

RE8_S2RE9_S3

RA0_POT

RA4_S1MCLR3

RB0_OSCI

RB2_ANBRB3_PGD2RB4_PGC2RB5_S1PGD3RB6_S1PGC3RB7_CSBRB8_SCLBRB9_SDAB

RB13_INTB

RB15_PWMA

RC12

RC3_MOSIARC4_PWMB

RC6_RSTBRC7_ANARC8_SCKBRC9_MISOBRC10_RXBRC11_TXB

Pin

32

Pin

11Pi

n 12

Pin

31

Pin

12Pi

n 11

RB14_RGB_BLUE

RD5_RGB_RED

RD7_RGB_GREEN

RB6_S1PGC3RB5_S1PGD3

3V3

VPP/MCLRVDD

GND

ICSPCLKNC

ICSPDAT

RA4_S1MCLR3

Slave Debug Only (during dual debug)

123456

HDR-2.54 1x6 STAGGERED

J15

100R 06031%R20

0.1 μF25V 0603

C4

0.1 μF25V 0603

C13

0.1 μF25V 0603

C3

0.1 μF25V0603

C12

1k06031%

R6

1k06031%

R4

1k06031%

R2

4.7k 06031%R99

3V3

RE7_S1

330RR12

330RR13

330RR11

Master and Slave Programming/Debug (also connects to PKOB circuit output)

0.1 μF25V0603

C60.1 μF25V0603

C70.1 μF25V0603

C80.1 μF25V0603

C90.1 μF25V0603

C1 1

5V

5V

RD14_ISENSEL

RA3_ISENSEH

RA1_VINSENSERA2_TRANSIENTFB

RC1_VOUTFB

RC14_S1PWM7HRC15_S1PWM7L

RC5_S1PWM2L

RC13_TRANSIENT

RC0_PWMDACFB

1k06031%

R73

RD12_S1PGA2P2

20k1%

R77

RB1_IBIAS2

RD9

RD11

RD13

RD15

RE2RE3RE4RE5RE6

RE10RE11RE12_SCLARE13_SDAARE14RE15

RB10_SCKARB11RB12

RD10

RC2

RE13_SDAA

RE12_SCLA DNPR78

DNPR81

10 μF25V0805

C1 0

16V1 μF

0603

C5

RP46/PWM1H/RB14 1

RE02

RP47/PWM1L/RB15 3

RE14

RP60/PWM4H/RC12 5

RP61/PWM4L/RC13 6

RP62/S1PWM7H/RC14 7

RP63/S1PWM7L/RC15 8

MCLR9

PCI22/S1PCI22/RD1510

VSS11

VDD12

PCI21/S1ANN1/S1PGA2N2/S1PCI21/RD1413 S1ANN0/S1PGA1N2/RD1314

AN12/S1AN10/IBIAS3/RP48/RC0 15

AN0/CMP1A/RA0 16

RE217

AN1/S1AN15/RA1 18

RE319

AN2/S1AN16/RA2 20

AN3/IBIAS0/S1AN0/S1CMP1A/S1PGA1P1/RA3 21

RE422

AN4/IBIAS1/S1MCLR3/S1AN1/S1CMP2A/S1PGA2P1/S1PGA3P2/RA4 23

RE524

AVDD25

AVSS26

S1AN14/S1PGA2P2/RD1227

AN13/S1ANA1/ISRC0/RP49/RC1 28

AN14/S1ANA0/ISRC1/RP50/RC2 29

RP54/S1AN11/S1CMP1B/RC6 30

VDD31

VSS32

CMP1B/S1AN8/S1CMP3B/RP51/RC3 33

OSC I/CLKI/AN5/RP32/S1AN5/RB0 34

OSCO/CLKO/AN6/IBIAS2/RP33/S1AN4/RB1 35

S1AN17/S1PGA1P2/RD1136

S1PGA3N2/RE637

ISRC3/S1AN13/S1CMP2B/RD1038

RE739 AN15/ISRC2/RP55/S1AN12/RC7 40

DACOUT/AN7/CMP1D/RP34/INT0/S1MCLR2/S1AN3/S1ANC0/S1ANC1/S1CMP1D/S1CMP2D/S1CMP3D/RB2 41

RE842

PGD2/AN8/RP35/S1PGD2/S1AN18/S1CMP3A/S1PGA3P1/RB3 43

RE944

PGC2/RP36/S1PGC2/S1AN9/S1PWM5L/RB4 45

RP56/ASDA1/SCK2/S1ASDA1/S1SCK1/RC8 46

RP57/ASCL1/SDI2/S1ASCL1/S1SDI1/RC9 47

PCI20/S1PCI20/RD948 SDO2/PCI19/S1SDO1/S1PCI19/RD849

VSS50

VDD51

RP71/S1PWM8H/RD752 RP70/S1PWM6H/RD653 RP69/S1PWM6L/RD554 PGD3/RP37/SDA2/S1PGD3/RB5 55

PGC3/RP38/SCL2/S1PGC3/RB6 56

RE1057

TDO/AN9/RP39/S1MCLR1/S1AN6/S1PWM5H/RB7 58

RE1159

PGD1/AN10/RP40/SCL1/S1PGD1/S1AN7/S1SCL1/RB8 60

PGC1/AN11/RP41/SDA1/S1PGC1/S1SDA1/RB9 61

ASCL2/RE1262

RP52/S1PWM2H/RC4 63

ASDA2/RE1364

RP53/S1PWM2L/RC5 65

RP58/S1PWM1H/RC10 66

RP59/S1PWM1L/RC11 67

RP68/S1PWM3H/RD468 RP67/S1PWM3L/RD369

VSS70

VDD71

RP66/S1PWM8L/RD272 RP65/S1PWM4H/RD173 RP64/S1PWM4L/RD074

TMS/RP42/PWM3H/RB10 75

TCK/RP43/PWM3L/RB11 76

RE1477

TDI/RP44/PWM2H/RB12 78

RE1579

RP45/PWM2L/RB13 80

U1 dsPIC33CH128MP508

Sch

ematics

2

01

8 M

icroch

ip T

ech

no

log

y Inc.

Ad

van

ce

Info

rma

tion

DS

50

00

27

62

A-p

ag

e 2

3

FIG )

Designed with

Altium.com

1 23 4

5 67 8

9 1011 12

13 1415 16

17 1819 20

222123 24

25 2627 28

29 3031 32

33 3435 36

HDR-2.54 Female 2x18

J11

3V3n Access Headers

1 23 4

5 67 8

9 10

HDR-2.54 Female 2x5

J18VOUT 5V

B RA3_ISENSEH

3V3

4 RA4_S1MCLR3RE5

RE3RA1_VINSENSERE2RA0_POT

RC4_PWMB

B

B

RC10_RXBRC11_TXB

RC14_S1PWM7HRC15_S1PWM7L

RC5_S1PWM2L

RC13_TRANSIENT

RC0_PWMDACFB

RC12

I

22

GD3

B

RB13_INTBRB15_PWMA

RB14_RGB_BLUE

RB10_SCKARB11RB12

RE0_LED1RE1_LED2

RE13_SDAA

RE14RE15

RD0_RXARD1_TXA RD2_INTARD3_CSA RD4_RSTA

OA

SIB

RD14_ISENSELRD13

RD15MCLR

TFB

URE A-2: dsPIC33CH CURIOSITY BOARD LAYOUT SCHEMATIC REV. 1.0 (SHEET TWO OF FOUR

I/O Pi

16V1 μF

0603

C30

Isolated USB-UART Interface

100kR76

ID 4

VBUS1

GND 5

D- 2

D+ 3

0

USB micro-B TH/SMT

J 16

U9D_PU9D_N

U9D_PU9D_N

VDD1GP0 2GP1 3RST 4UART RX 5UART TX 6GP2 7GP38

SDA9

SCL10

VUSB11

D-12

D+13

VSS14

MCP2221AU9

U9_V DD

U9_V DD

16V1 μF0603

C31

U9_G ND

U9_G ND

U9_G ND

U9_G ND

U9_V DD

U9_G ND

U9_G ND

3V3

1k0603

1%R75

RC10_RXBRC11_TXB

460.8 kB aud max

DNP

231J17

If installing J17, us e regulated 5V (5.5V max) isolated wall cube with center pin positive. Also recommended to cut NT2 and populate D1 to prevent VBUS backdrive current.

VBUS5

0.1 μF25V

C33

0.1 μF25V 0603

C29

0.1 μF25V 0603

C32

1 23 4

5 67 8

9 1011 12

13 1415 16

17 1819 20

222123 24

25 2627 28

29 3031 32

33 3435 36

HDR-2.54 Female 2x18

J12

3V3

Power Status (Green)LED5

5V

Power Supply

470R06031%

R182.2 μF10V0603

C232.2 μF10V0603

C39

VOUT1

VOUT2

GND 3EN4 NC5 VIN6

MIC5528 3V3

U12DNPD1

Net Tie0.5 mm

NT2

5VDNP

D7

Net Tie0.5 mm

NT3

VDD11

A12

A23

GND14 GND2 5

B2 6B1 7

VDD28

SI8422AB -D-IS

U11

RA2_TRANSIENTFRE

RC2RC3_MOSIA

RC6_RST

RC7_ANA

RC8_SCKBRC9_MISO

RB0_OSC

RB2_ANBRB3_PGDRB4_PGC

RB5_S1PRB6_S1PGC3RB7_CSBRB8_SCLB

RB9_SDA

RB1_IBIAS2

RE8_S2RE9_S3

RE7_S1RE6

RE10RE11

RE12_SCLA

RD6_MIS

RD8_MO

RD5_RGB_REDRD7_RGB_GREEN

RD10

RD12_S1PGA2P2

RD9

RD11

U1VDD

RC1_VOU

Isol

atio

n

5V

dsP

IC33C

H C

urio

sity Develo

pm

ent B

oard

User’s G

uid

e

DS

50

00

27

62

A-p

ag

e 2

4A

dv

anc

e In

form

atio

n

20

18

Micro

chip

Te

chn

olo

gy In

c.

FOUR)

Designed with

Altium.com

100R0603

1%

R56

3V3

12

J 10

z (J10 Open)z (J10 Closed)

4.7k1%

R70

Resistor Gain (J13 Closed) = 0.5481 (1.470 mV/ADC LSB at 12-bit, 3.3 VREF)

1k1%

R57

VOUT_FB

12

J13

1k06031%

R72

Resistor Gain (J13 Open) = 0.1754 (4.592 mV/ADC LSB at 12-bit, 3.3 VREF)

3V3

100R0603

1%R55

S1PWM2L_DAC_ISET

1PWM2L DAC/DC Bias Generator/RC Filter

0.010 μF25V0603

C26

DNP

C44

DNP

C43

DNPR86

0.1 μF25V

C25

0.1 μF25V0603

C41

100R06031%

R52

330R1%

R98

DNP

C46100R0603

1%R61

High-side current sense level shifter

Output voltage feedback circuit

+A3

-A2

OUTA 1

A

AVSS

4

VDD

8

MCP6292U7A

0.1 μF 25V0603

C24

+A3

-A4

OUTA 1

VSS

2

VDD

5

MCP6001U8

5V

5V

+B5

-B6

OUTB 7B

MCP6292

U7BB AT 54D8

3

1 2

RZM001P02T2LQ1

RA3_ISENSEH

12DNP

J19

RC0_PWMDACFB

20R08051%

6

ASED

RC1_VOUTFB

_J 10

_J 13

Designed with

Altium.com

FIGURE A-3: dsPIC33CH CURIOSITY BOARD LAYOUT SCHEMATIC REV. 1.0 (SHEET THREE OF

1k06031%

R54

RC15_S1PWM7L

TP LOOP BlackDNPTP5

Pole at ~ 15.9 kHPole at ~ 1.45 kH

10 μF25V0805

C3410 μF25V0805

C35

RSX

101M

M-3

0TR

D5

10 μF25V0805

C36

4.7k1%

R80

1k06031%

R85

470R

0603

1%

R831k0603

1%

R79

13

2MMBT3904Q 9

100R

0603 1%

R87

VOUT

0.010 μF 25V

0603C40

2.2k06031%

R84

S

On- time restrictorsub-circuit Adjustable constant-current transient load

Note: Q8 is driven in the linear region.Limit (peak power) * (on-time) product tomaintain peak Q8 juntion temp <150°C. 4

1,2,3

5,6,7,8

MCP87130TQ 8

13

2MMBT3904Q10

10k1%

R88

20k06031%

R90

20k0603

1%R91

MMBD914D6

10k1%

R89

Transient Load Tester Circuit

1R1206

1%

1/4W

R94

1R1206

1%

1/4W

R9 31R

12061%

1/4W

R9 2

1R1206

1%

1/4W

R591R1206

1%

1/4W

R7410 μF25V0805

C42

0603DNP

C3 8100R0603

1%R9 5

0.1 μF 25V0603

C37

16V1 μF0603

C51

470R06031%

R103

0603DNP

C52

Buck mode low-side off-time currentsense (Note: 0. 0V to -300 mV signal,

suggest -8x PGA gain)

For Buck Mode: PWM Q6, Drive Q2 DC OFFFor Boost Mode: Drive Q6 DC OFF (logic high or tri-state) , PW M Q2For Buck/Boost Mode: PWM Q6 and Q2 with s ame signal (Note: Q6 drive s hould be active-low, Q2 active-high)

Configurable Buck, Boost or Buck/Boost Test Circuit

Input voltage mo nitoring

41,2,3

5,6,7,8

MCP87130T

Q 2

3V3

0R0603

R60

0.1 μF25V0603

C21

5V

5V

330R1%

R15

5V

1R

12061%

1/4W

R6 3

BAT54D9

13

2MMBT3904Q 7

VOUT

0.010 μF25V 0603

C15

10k1%

R65

270R1%

R66

0.010 μF25V0603

C2220k0603

1%

R67

12

3

MMBT3906Q11

5V

1k06031%

R68

DNPC45

DNPR71

DNPR69

Hardware overcurrent protection (useful during

firmware development)

Output overvoltage protection (useful during firmware development)

ISENSEH

10 μF25V0805

C47

VOUT

GND2

I03 Y 4

Vcc 5

I2 6I11

NC7SZ58P6X

U105V

Configured as : Schmitt OR

C onfigured as : Schmitt AND

GND2

I03 Y 4

VCC5

I2 6I11

NC7SZ57P 6X

U5

3V3

3V3

ISENSEH_BIASED

RD14_ISENSEL

RA1_VINSENSE

RA2_TRANSIENTFB

5V

RC14_S1PWM7H

820R1%

R58

RC5_S1PWM2L

S1PWM2L_DAC_ISET

RC13_TRANSIENT

VOUT

Net TieNT5

12

DNPJ14

RSX

101M

M-3

0TR

D2

10 μF25V0805

C5310 μF25V0805

C55

10k 1%R82

5V

12

TERMINAL 1x2

J21VOUT

R9

10k1%

R102150R06031%

R97

ISENSEH_BI

ISENSEH

10k1%

R64

0.010 μF25V0603

C54

100 μF25V

C57

L ow ESR

Screw

3

1 2

BSS308PEQ 6

33 μH

L1

270R1%

R62

Sch

ematics

2

01

8 M

icroch

ip T

ech

no

log

y Inc.

Ad

van

ce

Info

rma

tion

DS

50

00

27

62

A-p

ag

e 2

5

FIG R)

Designed with

Altium.com

13

2MMBT3904Q 5

330R1%

R32 4.7k1%

R31

10k1%

R49

100R1%

R47MCLR

4.7k1%

R37

330R1%

R29

330R1%

R36

PKMOSI

PKMISO

PKSCK

RB3_PGD2

RB4_PGC2

13

2MMBT3904Q 4

10k1%

R46

12

3MMBT3906Q 3

10k1%

R44

3V3

100k1%

R42

3V3

Target ICSP™ Signals

Bumpon Hemisphere Black

PAD1 PAD2 PAD3 PAD4

URE A-4: dsPIC33CH CURIOSITY BOARD LAYOUT SCHEMATIC REV. 1.0 (SHEET FOUR OF FOU

100k1%

R45

D_PD_N

D_ND_P

3.16k1%

R27

1k1%

R25

VDD_SENSEVPP_SENSE

VPP_SENSE

VDD_SENSE

10k1%

R48

PKEE_CS

PKEE_WPPKEE_SCK

PKEE_MISO

PKEE_MISO

PKEE_CS

10k1%

R50

PKEE_SCK

PKEE_MOSI

PKEE_MOSIPKEE_WP

10k1%

R24

PKSCKPKMISOPKMOSI

PK_PGCPK_PGD

3V3

3V3

3V3

3V3 3V3

3V3

3V3 3V3 3V3

10k1%

R33

3V3

+t

500 mA Polyfuse1210TH1

100R1%

R2 8

10k1%

R35

10k1%

R38

3V3

2

31DNPX2

DNPR41DNP

R39

3V3 3V3

RC11_TXB

RC10_RXBDNP

R40

DNP

R43

1k06031%

R30

1k06031%

R34

3.57k06031%

R26

ID 4

VBUS1

GND 5

D- 2

D+ 3

0

USB MICRO-B FEMALE

J 20

PICkit™ On-Board

PKOB Serial EEPROM (25LC256)

3V3

PKOB USB Interface

123456

J9

PK_PGDPK_PGC

3V3

VPP/MCLRVDD

GND

ICSPCLKNC

ICSPDAT

PKVBUS

10 μF25V0805

C14

3V3

DSC 6011J I1A-012.0000

10k1%

R51

4.7k1%

R23

4.7k1%

R53

12

3 MM

BT

3906

Q12

0.1 μF25V0603

C49

20k

06031%

R101

0.1 μF25V0603

C50

20k0603

1%R100

PKVBUS

16V1 μF0603

C48

(with VBUS inrush slew rate limiting)

VBUS5

0.1 μF25V

C160.1 μF25V

C170.1 μF25V

C180.1 μF25V

C19

0.1 μF25V0603

C27

0.1 μF25V0603

C28

0.1 μF25V0603

C20

CS1

SO 2

WP3

VSS4

SI5 SCK6

HOLD7

VCC8

25L C 256-I/SN

U6

PMD5/CN63/RE5 1

SCL3/PMD6/CN64/RE6 2

SDA3/PMD7/CN65/RE7 3

C1IND/RP21/PMA5/CN8/RG64

C1INC/RP26/PMA4/CN9/RG75

C2IND/RP19/PMA3/CN10/RG86

MCLR7

RP27/PMA2/C2INC/CN11/RG98

Vss9

VDD10

PGEC3/AN5/C1INA/VBUSON/RP18/CN7/RB5 11PGED3/AN4/C1INB/USBOEN/RP28/CN6/RB4 12AN3/C2INA/VPIO/CN5/RB3 13AN2/C2INB/VMIO/RP13/CN4/RB2 14PGEC1/AN1/VREF -/RP1/CN3/RB1 15PGED1/AN0/VREF+/RP0/PMA6/CN2/RB0 16

PGEC2/AN6/RP6/CN24/RB6 17

PGED2/AN7/RP7/RCV/CN25/RB7 18

AVDD19

AVss20

AN8/RP8/CN26/RB8 21

AN9/RP9/PMA7/CN27/RB9 22

TMS/CVREF/AN10/PMA13/CN28/RB10 23

TDO/AN11/PMA12/CN29/RB11 24

Vss25

VDD26

TCK/AN12/PMA11/CTED2/CN30/RB12 27

TDI/AN13/PMA10/CTED1/CN31/RB13 28

AN14/CTPLS/RP14/PMA1/CN32/RB14 29

AN15/RP29/REFO/PMA0/CN12/RB1530

SDA2/RP10/PMA9/CN17/RF431

SCL2/RP17/PMA8/CN18/RF532

RP16/USBID/CN71/RF333

VBUS34

VUSB35

D-/RG336 D+/RG237

VDD38

OSCI/CLKI/CN23/RC12 39

OSCO/CLKO/CN22/RC15 40

Vss41

RTCC/DMLN/RP2/CN53/RD8 42

DPLN/SDA1/RP4/CN54/RD9 43

SCL1/RP3/PMCS2/CN55/RD1044

RP12/PMCS1/CN56/RD11 45

DMH/RP11/INT0/CN49/RD0 46

SOSCI/C3IND/CN1/RC13 47

SOSCO/T1CK/C3INC/RPI37/CN0/RC14 48

VCPCON/RP24/CN50/RD1 49

DPH/RP23/CN51/RD2 50

RP22/PMBE/CN52/RD3 51

RP25/PMWR/CN13/RD4 52

RP20/PMRD/CN14/RD5 53

C3INB/CN15/RD6 54

C3INA/CN16/RD7 55

VCAP/VDDCORE56

ENVREG57

VBUSST/VCMPST1/CN68/RF058

VCMPST2/CN69/RF159

PMD0/CN58/RE0 60

PMD1/CN59/RE1 61

PMD2/CN60/RE2 62

PMD3/CN61/RE3 63

PMD4/CN62/RE4 64

U4

3

1 2

DMP2100UQ13

STB1

GND2 OUT 3

VDD4

12.00 MH z

X 3

PIC24FJ256GB106-I/PT


NOTES:



Appendix B. Bill of Materials (BOM)

TABLE B-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD BILL OF MATERIALS

Qty. Designator Description Mfg. 1 Mfg. 1 Part # Mfg. 2 Mfg. 2 Part #

28 C1, C2, C3, C4, C6, C7, C8, C9, C11, C12, C13, C16, C17, C18, C19, C20, C21, C24, C25, C27, C28, C29, C32, C33, C37, C41, C49, C50

Capacitor Ceramic, 0.1 µF, 25V, 10%, X7R, SMD, 0603

Murata Electronics®

GRM188R71E104KA01D Wurth Elektronik 885012206071

5 C5, C30, C31, C48, C51

Capacitor Ceramic, 1 µF, 16V, 10%, X7R, SMD, 0603

Taiyo Yuden Co., Ltd.

EMK107B7105KA-T Wurth Elektronik 885012206052

9 C10, C14, C34, C35, C36, C42, C47, C53, C55

Capacitor Ceramic, 10 µF, 25V, 10%, X5R, SMD, 0805

Murata Electronics

GRM21BR61E106KA73L

5 C15, C22, C26, C40, C54

Capacitor Ceramic, 0.010 µF, 25V, 10%, X7R, SMD, 0603

Yageo Corporation

CC0603KRX7R8BB103 Wurth Elektronik 885012206065

2 C23, C39 Capacitor Ceramic, 2.2 µF, 10V, 10%, X7R, SMD, 0603

MurataElectronics

GRM188R71A225KE15D Wurth Elektronik 885012206027

1 C57 Capacitor Aluminum, 100 µF, 20%, 25V, Low-ESR, Radial

KEMET ESY107M025AE3AA

19 R1, R3, R5, R24, R33, R35, R38, R44, R46, R48, R49, R50, R51, R64, R65, R82, R88, R89, R102

Resistor TKF, 10k, 1%, 1/10W, SMD, 0603

Panasonic® - ECG

ERJ-3EKF1002V

17 R2, R4, R6, R8, R14, R19, R25, R30, R34, R54, R57, R68, R72, R73, R75, R79, R85


Panasonic - ECG

ERJ-3EKF1001V

8 R7, R23, R31, R37, R53, R70, R80, R99

Resistor TKF, 4.7k, 1%, 1/10W, SMD, 0603

ROHM Semiconductor

MCR03EZPFX4701

3 R9, R10, R58 Resistor TKF, 820R, 1%, 1/10W, SMD, 0603

Stackpole Electronics, Inc.

RMCF0603FT820R

8 R11, R12, R13, R15, R29, R32, R36, R98

Resistor TKF, 330R, 1%, 1/10W, SMD, 0603

Panasonic - ECG

ERJ-3EKF3300V


Panasonic - ECG

ERJ-3EKF2700V

1 R17 Resistor, Variable, 10K, 20%, TH

Alps Electric Co., Ltd.

RK09K1130A5R


Panasonic - ECG

ERJ-3EKF4700V

9 R20, R28, R47, R52, R55, R56, R61, R87, R95


Panasonic - ECG

ERJ-3EKF1000V

1 R26 Resistor, SMD, 3.57 kOhm, 1%, 1/10W, 0603

Vishay/Dale CRCW06033K57FKEA

1 R27 Resistor TKF, 3.16k, 1%, 1/10W, SMD, 0603

Panasonic - ECG

ERJ-3EKF3161V

3 R42, R45, R76 Resistor TKF, 100k, 1%, 1/10W, SMD, 0603

Panasonic - ECG

ERJ-3EKF1003V

6 R59, R63, R74, R92, R93, R94


ROHM Semiconductor

MCR18EZHFL1R00

1 R60 Resistor TKF, 0R, 1/10W, SMD, 0603

Panasonic - ECG

ERJ-3GSY0R00V

6 R67, R77, R90, R91, R100, R101


Panasonic - ECG

ERJ-3EKF2002V


http://katalog.we-online.com/pbs/datasheet/885012206071.pdf





1 R84 Resistor TKF, 2.2k, 1%, 1/10W, SMD, 0603

Panasonic - ECG

ERJ-3EKF2201V

1 R96 Resistor TKF, 20R, 1%, 1/8W, SMD, 0805

ROHM Semiconductor

MCR10EZHF20R0

1 R97 Resistor TKF, 150R, 1%, 1/10W, SMD, 0603

Stackpole Electronics, Inc.

RMCF0603FT150R

1 L1 Inductor, 33 µH, 1.7A, 0.120R, TH

Bourns®, Inc. RLB0914-330KL Wurth Elektronik 7447471330

2 D2, D5 Diode Schottky, 30V, 1A, PMDU ROHM Semiconductor

RSX101MM-30TR

1 D6 Diode Rectifier, MMBD914LT1G, 1V, 10 mA, 100V, SMD, SOT-23-3

ON Semiconductor®

MMBD914LT1G

2 D8, D9 Diode Schottky, BAT54, 800 mV, 200m A, 30V, SOT-23-3

Diodes Incorporated®

BAT54-7

2 LED1, LED2 Diode LED Red, 2V, 20 mA, 104 mcd, Diffuse, SMD, 0805

OSRAM Opto Semiconductors GmbH.

LS R976-NR-1 Wurth Elektronik 150080RS75000

1 LED3 Diode LED Tri Red, Green, Blue Cree, Inc. CLX6D-FKB-CMPQSGKBB7A363

1 LED5 Diode LED Green, 2.2V, 25 mA, 15 mcd, Clear, SMD, 0603

Kingbright Electronics Co., Ltd.

APT1608SGC Wurth Elektronik 150060GS75000

3 Q3, Q11, Q12 Transistor BJT PNP, MMBT3906, -40V, -200 mA, 300 mW, SOT-23-3

Diodes Incorporated

MMBT3906-7-F

5 Q4, Q5, Q7, Q9, Q10

Transistor BJT NPN, MMBT3904, 40V, 200 mA, 310 mW, SOT-23-3

Diodes Incorporated

MMBT3904-7-F

1 Q1 MOSFET P-CH, 20V, 0.1A, SOT-723-3

ROHM Semiconductor

RZM001P02T2L

1 Q6 MOSFET P-CH, 30V, 2A, SOT-23

Infineon Technologies AG

BSS308PEH6327XTSA1

1 Q13 MOSFET P-CH, 20V, 4.3A, SOT-23

Diodes Incorporated

DMP2100U-7

2 Q2, Q8 MOSFET N-CH, 25V, MCP87130T-U/LC

Microchip Technology Inc.

MCP87130T-U/LC

4 J3, J8 Connector Header-2.54 Female, 1x8, 0.100" (2.54 mm), Tin, Through-Hole

Sullins Connector Solutions

PPTC081LFBN-RC Wurth Elektronik 61300811821

2 J10, J13 Connector Header-2.54 Male, 1x2, Gold, 5.84MH, TH, Vertical

FCI 77311-118-02LF Wurth Elektronik 61300211121

2 _J10, _J13 Mechanical Hardware Jumper Cap, 2.54 mm, 1x2

3M 969102-0000-DA Wurth Elektronik 60900213421

2 J11, J12 Connector Header-2.54 Female, 2x18, 0.100" Pitch, Gold, TH

Samtec, Inc. SSW-118-01-G-D Wurth Elektronik 61303621821

2 J16, J20 Connector USB 2.0 micro-B Female, TH/SMD, R/A

FCI 10118194-0001LF Wurth Elektronik 629105136821

1 J18 Connector Header-2.54 Female, 2x5, 0.100", Gold, TH

Samtec, Inc. SSQ-105-02-G-D Wurth Elektronik 61301021821

1 J21 Connector Screw Terminal, 5 mm, 1x2, Female, 12-26AWG, 18A, TH, R/A

Phoenix Contact GmbH & Co.

1935161 Wurth Elektronik 691102710002

4 S1, S2, S3, S4 Switch Tact, SPST, 12V, 50 mA, PTS645SM43SMTR92 LFS, SMD

C&K Components

PTS645SM43SMTR92 LFS Wurth Elektronik 430182043816

4 PAD1, PAD2, PAD3, PAD4

Mechanical Hardware Rubber Pad, Bumpon Hemisphere, 0.44" x 0.20", Black

3M SJ-5003 (BLACK)

1 TH1 PTC Resettable, 0.50A, 16V, Chip, 1210

Bel Fuse Inc. 0ZCB0050FF2G

1 U11 Digital ISO, 2.5KV, General Purpose, 8-SOIC

Silicon Laboratories® Inc.

SI8422AB-D-IS

TABLE B-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD BILL OF MATERIALS (CONTINUED)




http://katalog.we-online.com/led/datasheet/150080RS75000.pdf

http://katalog.we-online.com/led/datasheet/150060GS75000.pdf

http://katalog.we-online.com/em/datasheet/6130xx11821.pdf


http://katalog.we-online.com/em/datasheet/60900213421.pdf


http://katalog.we-online.com/em/datasheet/629105136821.pdf


http://katalog.we-online.com/em/datasheet/6911017100xx.pdf

http://katalog.we-online.com/em/datasheet/4301x2xxx8x6.pdf

Bill of Materials (BOM)

1 U5 IC Logic Gate, UHS, 2-INP, SC70-6

Fairchild Semiconductor®/ON Semiconductor

NC7SZ57P6X

1 U10 IC Logic Gate, UHS, 2-INP, SC70-6

Fairchild Semiconductor/ON Semiconductor

NC7SZ58P6X

1 U1 dsPIC33CH128MP508, TQFP-80


dsPIC33CH128MP508-I/PT

1 U4 Microchip MCU, 16-Bit, 32 MHz, 256 kB, 16 kB, PIC24FJ256GB106-I/PT, TQFP-64


PIC24FJ256GB106-I/PT

1 U6 Microchip Memory Serial EEPROM, 256k, SPI, 25LC256-I/SN, SOIC-8


25LC256T-I/SN

1 U7 Microchip Analog Op Amp, 2-Ch, 10 MHz, MCP6292T-E/MS, MSOP-8


MCP6292T-E/MS

1 U8 Microchip Analog Op Amp, 1-Ch, 1 MHz, MCP6001T-I/OT, SOT-23-5


MCP6001T-I/OT

1 U9 Microchip Interface, USB, I2C, UART, MCP2221A-I/ST, TSSOP-14


MCP2221A-I/ST

1 U12 MIC5528-3.3 Linear Voltage Regulator IC, Positive, Fixed, 1 Output, 3.3V, 500 mA, 6-TDFN (1.2x1.2)


MIC5528-3.3YMT-TR

1 X1 MEMS Oscillator, 8.0000 MHz, 2.5x2.0 mm


DSC6011JI1A-008.0000

1 X3 MEMS Oscillator, 12.0000 MHz, 2.5x2.0 mm


DSC6011JI1A-012.0000

Do Not Populate Parts Listed Below

3 C38, C45, C52 Unpopulated pad

3 C43, C44, C46 Unpopulated pad

2 D1, D7 Unpopulated pad

3 J1, J14, J19 Unpopulated pad

2 J2, J15 Unpopulated pad

1 J9 Unpopulated pad

1 J17 Unpopulated pad

7 R21, R22, R69, R71, R78, R81, R86

Unpopulated pad

4 R39, R40, R41, R43 Unpopulated pad

1 TP5 Unpopulated pad

1 X2 Unpopulated pad

TABLE B-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD BILL OF MATERIALS (CONTINUED)




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