STK525.............................................................................................
Hardware User Guide
STK525 Hardware User Guide Use
Section 1Introduction ........................................................................................... 1-3
1.1 Overview ...................................................................................................1-31.2 STK525 Starter Kit Features .....................................................................1-4
Section 2Using the STK525................................................................................. 2-6
2.1 Overview ...................................................................................................2-62.2 Power Supply ............................................................................................2-72.3 RESET ....................................................................................................2-102.4 AT90USBxxx AVR Microcontroller..........................................................2-112.5 Serial Links .............................................................................................2-112.6 On-board Resources...............................................................................2-142.7 STK500 Resources .................................................................................2-192.8 In-System Programming .........................................................................2-202.10 Test Points ..............................................................................................2-232.11 Configuration Pads .................................................................................2-242.12 Solder Pads ............................................................................................2-25
Section 3Troubleshooting Guide ....................................................................... 3-26
Section 4Technical Specifications ..................................................................... 4-27
Section 5Technical Support ............................................................................... 5-28
Section 6Complete Schematics ......................................................................... 6-29
r Guide 1
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Section 1
Introduction
Congratulation for acquiring the AVR® STK525 Starter Kit. This kit is designed to givedesigners a quick start to develop code on the AT90USBxxx and for prototyping andtesting of new designs.
1.1 Overview
This document describes the STK525 dedicated to the AT90USBxxx AVRmicrocontroller. This board is designed to allow an easy evaluation of the product usingdemonstration software.
To complement the evaluation and enable additional development capability, theSTK525 can be plugged into the Atmel STK500 Starter Kit Board in order to use theAT90USBxxx with advanced features such as variable VCC, variable VRef, variableXTAL, etc. and supports all AVR development tools.
To increase its demonstrative capabilities, this stand alone board has numerous on-board resources (USB, RS232, joystick, data-flash, microphone and temperaturesensor).
This user guide acts as a general getting started guide as well as a complete technicalreference for advanced users.
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Introduction
Figure 1-1 . STK525 Board
1.2 STK525 Starter Kit Features
The STK525 provides the following features:
� AT90USBxxx TQFP device (2.7V<Vcc<5.5V),
� AVR Studio® software interface (1),
� USB software interface for Device Firmware Upgrade (DFU bootloader) (2)
� STK500 compatible
� Power supply flagged by “VCC-ON” LED:
– regulated 3 or 5V,– from an external power connector,– from the USB interface (USB device bus powered application),– from STK500 (2),
� ISP connector for on-chip ISP,
� JTAG connector:
– for on-chip ISP,– for on-chip debugging using JTAG ICE,
� Serial interfaces:
– 1 USB full/low speed device/host interface– RS-232C ports with RTS/CTS handshake lines,
� On-board resources:
– 4+1-ways joystick,– 4 LEDs,– temperature sensor,– microphone,– serial dataflash memory,
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Introduction
� On-board RESET button,
� On-board HWB button for force bootloader section execution at reset.
� System clock:
– external clock from STK500 expand connectors– 8 MHz crystal,
� Numerous access points for test.
Notes: 1. The STK525 is supported by AVR Studio®, version 4.12SP2 or higher. For up-to-dateinformation on this and other AVR tool products, please consult our web site. Thenewest version of AVR Studio®, AVR tools and this User Guide can be found in theAVR section of the Atmel web site, http://www.atmel.com.
2. ATMEL Flip®, In System Programming Version 3 or Higher shall be used for DeviceFirmware Upgrade. Please consult Atmel web site to retrieve the latest version of Flipand the DFU bootloader Hex file if needed.
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Section 2
Using the STK525
This chapter describes the board and all its features.
2.1 Overview
Figure 2-1 . STK525 Overview
USB MiniAB RS232 JTAG ISP External Power
Joystick Potentiometer ResetCrystal Microphone
STK
500
Exp
and0
STK
500
Exp
and1
Data FlashLEDS
Vcc Src.Setting
TQFP64 Socket
Pin1
�C Sensor
Vbus Gen.Setting
BootloaderActivation
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2.2 Power Supply
The on-board power supply circuitry allows various power supply configurations.
2.2.1 Power Supply Sources
The power supply source can come from three different (3) and exclusive sources:
� USB connector,
� JACK PWR connector (J6, See Figure 2-2),
� STK500
USB powered: When used as a USB device bus powered application, the STK525 can be powered viathe USB VBUS power supply line.
JACK PWR connector: – Need of a male JACK outlet,– Input supply from 9 up to 15V (1) DC,– No specific polarization (2) is required.
Figure 2-2 . JACK PWR Connector (J6)
Figure 2-3 . Male JACK Outlet and Wires
STK500 Powered: (c.f. “STK500 Resources” on page 19).
Notes: 1. 15V is the maximum level limitation of an unidirectional transit diode.2. There is a diode (bridge) voltage level between the negative output of the power
supply and the STK525 “GND”. This could introduce some gap of voltage duringmeasurement and instrumentation.
3. Caution: Do not mount more than one power supply source on STK525.
+-
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2.2.2 Power Supply Setting
Table 2-1 . Power Supply (1) Setting
Notes: 1. Caution: The STK500 has its own “ON/OFF” switch
Vcc SourceJumper position
VCC powersupply value
Comments View
VBUS 5VBUS
(4,7V to 5.0V)
This is the default configuration.
This should be used for a typical USB device “bus powered” application.
In this mode, the STK525 is powered directly from the USB bus, and no other external power supply is required.
REG 5 5V
This configuration can be used for a USB “self powered” device application” or when operating has a USB host.
To use this configuration an external power supply must be connected to J6 connector.
REG 3.3 3.3V
This configuration allows the STK525 to be used in a 3V range application.
This configuration can be used with both device or host mode USB applications.
To use this configuration an external power supply must be connected to J6 connector.
STKDepends on STK500 VTG
setting
This configuration allows the STK525 to be used with an STK500 board.
In this mode, the STK525 power supply is generated and configured according to the “VTG” parameter of the STK500 (1).
VCCSource
Reg 5
Reg 3.3
VBUS 5
STK
VCCSource
Reg 5
Reg 3.3
VBUS 5
STK
VCCSource
Reg 5
Reg 3.3
VBUS 5
STK
VCCSource
Reg 5
Reg 3.3
VBUS 5
STK
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2.2.3 VBUS Generator Setting
When using the AT90USBxxx microcontroller in USB host mode. The STK525 shouldprovide a 5V power supply over the VBUS pin of its USB mini AB connector.
A couple of transistors on the STK525 allows the UVCON pin of the AT90USBxxx tocontrol the VBUS generation (See Figure 2-4). In this mode the STK525 is powered byexternal power supply source (J6 or STK500 expand0/1 connectors). JP7 allows toselect the 5V source used by the VBUS generator.
Figure 2-4 . VBUS generator schematic
Table 2-2 . VBUS Generator Setting
M1
FDV304P/FAI
R33
100k
VTG
STK
Ext
Q2BC847B
-
C344.7uF
21
3
JP7
VBUS genR3210k
UVCON
VBUS
“Vbus Gen”Jumper position
STK525 power supply Comments View
“Ext” External power supply from J6
This is the default configuration.
The VBUS generator source is the on-board 5V regulator.
“Stk”External power supply from Expand0/1 (connected to a STK500)
The VBUS generator source is the STK500.
Note:
The “Vtarget” setting of STK500 should be set to “5V”.
VbusGen
Ext
Stk
VbusGen
Ext
Stk
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2.2.4 “POWER-ON“ LED
The POWER-ON LED is always lit when power is applied to STK525 regardless ofpower supply source and the regulation.
Figure 2-5 . “VCC-ON” LED
2.3 RESET
Although the AT90USBxxx has its on-chip RESET circuitry (c.f. AT90USBxxxDatasheet, section “System Control and Reset), the STK525 provides the AT90USBxxxa RESET signal which can come from 3 different sources:
2.3.1 Power-on RESET
The on-board RC network acts as power-on RESET.
2.3.2 RESET Push Button
By pressing the RESET push button on the STK525, a warm RESET of theAT90USBxxx is performed.
Figure 2-6 . RESET Push Button (RST) Implementation
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2.3.3 STK500 RESET
(c.f. “RESET from STK500” on page 20)
2.4 AT90USBxxx AVR Microcontroller
2.4.1 Main Clock XTAL
To use the USB interface of the AT90USBxxx, the clock source should always be acrystal or external clock oscillator (the internal 8MHz RC oscillator cannot be used tooperate with the USB interface). Only the following crystal frequency allows proper USBoperations: 2MHz, 4MHz, 6MHz, 8MHz, 12MHz, 16MHz. The STK525 comes with adefault 8MHz crystal oscillator.
When closing STKX1 and STKX2 switches, and STK525 is connected to an STK500,the STK525 can operate with the “STK500 Osc” frequency parameter.
2.4.2 Analog Power Supply
AVCC By default, AVCC is equivalent to VCC.
ANA REF By default, AREF is an output of AT90USBxxx.An external AREF source can be chosen (c.f. “STK500 Resources” on page 19).
2.5 Serial Links
2.5.1 USB
The STK525 is supplied with a standard USB mini A-B receptacle. The mini ABreceptacle allows to connect both a mini A plug or a mini B plug connectors.
Figure 2-7 . USB mini A-B Receptacle
When connected to a mini B plug, the AT90USBxxx operates as an “USB device” (theID pin of the plug is unconnected) and when connected to a mini A plug, theAT90USBxxx operates as a “USB host” (the ID pin of the plug is tied to ground).
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2.5.2 RS-232C
The AT90USBxxx is a microcontroller with an on-chip USART peripheral (USART1).Only the asynchronous mode is supported by the STK525.
The STK525 is supplied with a RS-232 driver/receiver. One female DB9 connectorassumes the RS-232 connections.
Figure 2-8 . RS-232 DB9 Connector
Figure 2-9 . RS-232 DB9 Connections
Figure 2-10 . Typical PC Connection Layout
1
RS-232 DB9 front view
pin 2
5
69
234
78
RS-TxD
pin 3 RS-RxD
pin 4
pin 6
pin 5 GND
pin 7 RS-CTS
pin 8 RS-RTS
STK525 / RS-232 DB9PC / DB9 serial port
Pin No
(COM1 or COMx)
Function Pin No Function
2TxD (AT90USBxxx)
5GND
2
3
RxD (PC)
TxD (PC)3RxD (AT90USBxxx)
5 GND
7CTS (AT90USBxxx) 7
8
RTS (PC)
CTS (PC)8RTS (AT90USBxxx)
If Hardware Data Flow Control
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Using the STK525
The STK525 USART implementation allows an optional hardware flow control that canbe enabled thanks to SP4, SP5, SP7, SP8 solder pads (See Figure 2-11).
Figure 2-11 . USART Schematic
Table 2-3 . UART Settings
Note: 1. Tx reference: STK525 source, Rx reference: STK525 destination
ModeSolder Pads
ConfigurationDB9
Connection (1)
Software Data FlowControl
(default configuration)
SP4: openSP5: openSP7: openSP8: open
TxRx
Pin 2Pin 3
Optional Hardware Flow Control
SP4: closeSP5: closeSP7: closeSP8: close
TxRx
CTSRTS
Pin 2Pin 3Pin 7Pin 8
594837261
10
11
P1
SUB-D9 FEMALERS232
RS232 Interface
RS-CTS
VCC
CTS
RTS
.11
.12
.10
.9
.8
.7
.13
.14
.15
.16
C1+1
V+2
C1-3
C2+4
C2-5
V-6
RS 232TTL
GND
VCC
U3
MAX3232RS232 BUFFER
C17
100nF
C16
100nFC18
100nF
C19100nF
RxDPD2
RS-TxDRS-TxDRS-TxDRS-TxDRS-TxDRS-TxDRS-TxDRS-TxD
RS-RxD
PD[7..0]
SP4
SP5
PD1
PD0
PD3 TXDSP7
SP8
RS-RTS
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Using the STK525
2.6 On-board Resources
2.6.1 Joystick
The 4+1 way joystick offers an easy user interface implementation for a USB application(it can emulate mouse movements, keyboard inputs, etc.).Pushing a push-button causes the corresponding signal to be pulled low, while releasing(not pressed) causes an H.Z state on the signal. The user must enable internal pull-upson the input pins, removing the need for an external pull-up resistors on the push-button.
Figure 2-12 . Joystick Schematic
Figure 2-13 . Joystick Implementation
2.6.2 LEDs
The STK525 includes 4 green LEDs implemented on one line. They are connected tothe high nibble of “Port D” of AT90USBxxx (PORTD[4..7]).
To light On a LED, the corresponding port pin must drive to high level. To light Off aLED, the corresponding port pin must drive a low level. It is the opposite method used inSTK500.
Select5
Lef t7
Up3
Right6
Down4
Com11
Com22
SW3
TPA511G
PE[7..0]
PB[7..0]
PB5PB6PB7PE4PE5
Select5
Lef t7
Up3
Right6
Down4
Com11
Com22
SW3
TPA511G
PE[7..0]
PB[7..0]
PB5PB6PB7PE4PE5
Select5
Lef t7
Up3
Right6
Down4
Com11
Com22
SW3
TPA511G
PE[7..0]
PB[7..0]
PB5PB6PB7PE4PE5
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Using the STK525
Figure 2-14 . LEDs Implementation Schematic
In-line Grouped LEDs
D2TOPLED LP M676
LED 0 (green)
D3TOPLED LP M676
LED 1 (green)
D4TOPLED LP M676
LED 2 (green)
D5TOPLED LP M676
LED 3 (green)
R121k
R131k
R141k
R151k
PD4
PD5
PD7
PD[7..0]
PD6
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2.6.3 Temperature Sensor
The temperature sensor uses a thermistor (R18), or temperature-sensitive resistor. Thisthermistor has a negative temperature coefficient (NTC), meaning the resistance goesup as temperature goes down. Of all passive temperature measurement sensors,thermistors have the highest sensitivity (resistance change per degree of temperaturechange). Thermistors do not have a linear temperature/resistance curve.
The voltage over the NTC can be found using the A/D converter (connected to channel0). See the AT90USBxxx datasheet for how to use the ADC. The thermistor value (RT)is calculated with the following expression:
Where: RT = Thermistor value (Ω) at T temperature (°Kelvin)
RH = Second resistor of the bridge -100 KΩ ±10% at 25°C
VADC0 = Voltage value on ADC-0 input (V)
VCC = Board power supply
The NTC thermistor used in STK525 has a resistance of 100 KΩ ±5% at 25°C (T0) and abeta-value of 4250 ±3%. By the use of the following equation, the temperature (T) canbe calculated:
Where: RT = Thermistor value (Ω) at T temperature (°Kelvin)
ß = 4250 ±3%
R0 = 100 KΩ ±5% at 25°C
T0 = 298 °K (273 °K + 25°K)
The following cross table also can be used. It is based on the above equation.
Table 2-4 . Thermistor Values versus Temperature
Temp.(°C)
RT
(KΩ)Temp.(°C)
RT
(KΩ)Temp.(°C)
RT
(KΩ)Temp.(°C)
RT
(KΩ)
-20 1263,757 10 212,958 40 50,486 70 15,396
-19 1182,881 11 201,989 41 48,350 71 14,851
-18 1107,756 12 191,657 42 46,316 72 14,329
-17 1037,934 13 181,920 43 44,380 73 13,828
-16 973,006 14 172,740 44 42,537 74 13,347
-15 912,596 15 164,083 45 40,781 75 12,885
-14 856,361 16 155,914 46 39,107 76 12,442
-13 803,984 17 148,205 47 37,513 77 12,017
-12 755,175 18 140,926 48 35,992 78 11,608
-11 709,669 19 134,051 49 34,542 79 11,215
-10 667,221 20 127,555 50 33,159 80 10,838
RT RH VADC0⋅( ) VCC VADC0–( )⁄=
T βRT
R0-------ln
⎝ ⎠⎛ ⎞ β
T0------+
-------------------------------=
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Using the STK525
Figure 2-15 . Thermistor Schematic
2.6.4 Microphone
The STK525 provides an electret microphone associated with its required preamplifier(See Figure 2-16), the interface is connected to ADC channel 2 of the AT90USBxxxmicrocontroller.
-9 627,604 21 121,414 51 31,840 81 10,476
-8 590,613 22 115,608 52 30,580 82 10,128
-7 556,056 23 110,116 53 29,378 83 9,793
-6 523,757 24 104,919 54 28,229 84 9,471
-5 493,555 25 100,000 55 27,133 85 9,161
-4 465,300 26 95,342 56 26,085 86 8,863
-3 438,854 27 90,930 57 25,084 87 8,576
-2 414,089 28 86,750 58 24,126 88 8,300
-1 390,890 29 82,787 59 23,211 89 8,035
0 369,145 30 79,030 60 22,336 90 7,779
1 348,757 31 75,466 61 21,498 91 7,533
2 329,630 32 72,085 62 20,697 92 7,296
3 311,680 33 68,876 63 19,930 93 7,067
4 294,826 34 65,830 64 19,196 94 6,847
5 278,995 35 62,937 65 18,493 95 6,635
6 264,119 36 60,188 66 17,820 96 6,430
7 250,134 37 57,576 67 17,174 97 6,233
8 236,981 38 55,093 68 16,556 98 6,043
9 224,606 39 52,732 69 15,964 99 5,860
Temp.(°C)
RT
(KΩ)Temp.(°C)
RT
(KΩ)Temp.(°C)
RT
(KΩ)Temp.(°C)
RT
(KΩ)
TemperatureSensor
R18
CP1R16100k
PF
0
VCC
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Using the STK525
Figure 2-16 . Microphone interface schematic
2.6.5 Data Flash Memory
For mass-storage class demonstration purposes, the STK525 provides an on-chip serialFlash memory (AT45DB321x) connected to the AT90USBxxx Serial Port Interface(SPI).
The data-flash chip select signal is connected to PortB bit 4 of the AT90USBxxx (SeeFigure 2-17).
Figure 2-17 . On-board data flash schematic
2.6.6 Potentiometer
The cursor of a potentiometer is connected to ADC channel 1 of the AT90USBxxx.
3.3V3.3V
3.3V R23 100k
1
TP4
Mic
5
67
84
+
-
U4BLMV358
3
21
84
+
-
U4ALMV358
R27 0R26 22k
R25 10k
R24 100k
+C25
1uF
R21
100k
R28100k
C22 220pF
+
C24 4.7uF
R202.2k
MIC1
MICROPHONE
R22100k
3.3V
BUSY1
RESET2
WP3 VCC
6
GND7
CS11
SCK12
SI13
SO14
U2
AT45DB321C TSOP28
C15100nF
PB[7..0]
R11100k
PB4
3.3V
PB1
R10100k
RESET
PB2PB3
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Using the STK525
2.7 STK500 Resources
Figure 2-18 . Connecting STK525 to the STK500 Board
Note: Caution: Do not mount an AVR microcontroller on the STK500 board when STK525 isplugged on STK500.
2.7.1 Supply Voltage from STK500
The AVR supply voltage coming from STK500 (VTG) can also be controlled from AVRStudio®.
� The supply voltage coming from STK500 is controlled by power supply circuitry ofthe STK525. Refer to Table 2-1 on page 8 to configure “Vcc Source” jumper.
2.7.2 Analog Reference Voltage from STK500
The AVR Analog Reference Voltage coming from STK500 (REF) can also be controlledfrom AVR Studio®.
� JP3 should be closed
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2.7.3 EXP.CON 0 & EXP.CON 1 Connectors
Figure 2-19 . EXP.CON 0 and EXP.CON 1 Connectors
2.7.4 Main Clock from STK500
The AVR clock frequency (external) coming from STK500 (XT1/XT2) can also becontrolled from AVR Studio®.
� “STKX1” and ”STKX2” jumpers should be closed
2.7.5 RESET from STK500
The AVR RESET coming from STK500 (NRST - EXP.CON 0) can also control theSTK525. STK525 is protected against +12V RESET pulse (parallel programing notallowed for AT90USBxxx on STK525) coming from STK500.
2.8 In-System Programming
2.8.1 Programming with USB bootloader: DFU (Device Firmware Upgrade)
AT90USBxxx part comes with a default factory pre-programmed USB bootloaderlocated in the on-chip boot section of the AT90USBxxx. This is the easiest and fastestway to reprogram the device directly over the USB interface. The “Flip” PC sideapplication available for free on Atmel website offers a flexible and user friendlyinterface to reprogram the application over the USB bus.
EXP. CON 1
GND GND1 2n.c. (AUXI0) n.c. (AUXO0)3 4
n.c. (CT7) n.c. (CT6)5 6n.c. (CT5) n.c. (CT4)7 8n.c. (CT3) n.c. (CT2)9 10n.c. (CT1) n.c. (BSEL2)11 12
n.c. REF13 14NRST PG215 16
PG1 PG017 18GND GND19 20
PC7 PC623 24VTG VTG21 22
PC5 PC425 26PC3 PC227 28PC1 PC029 30PA7 PA631 32PA5 PA433 34PA3 PA235 36PA1 PA037 38
GND GND39 40
GND GND1 2n.c. (AUXI1) n.c. (AUXO1)3 4n.c. (DATA7) n.c. (DATA6)5 6n.c. (DATA5) n.c. (DATA4)7 8n.c. (DATA3) n.c. (DATA2)9 10n.c. (DATA1) n.c. (DATA0)11 12
n.c. (SI) n.c. (SO)1314n.c. (SCK) n.c. (CS)1516
XT1 XT21718VTG VTG1920
PB7 PB62324GND GND2122
PB5 PB42526PB3 PB22728PB1 PB02930PD7 PD63132PD5 PD43334PD3 PD23536PD1 PD03738GND GND3940
EXP. CON 0Top View
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The HWB pin of the AT90USBxxx allows to force the bootloader section execution afterreset. (Refer to AT90USBxxx datasheet section “boot loader support”). To forcebootloader execution, operate as follows:
� Press both “RST” and “HWB” push buttons
� First release the “RST” push button
� Release the “HWB” push button
For more information about the USB bootloader and FLIP software, please refer to the‘USB bootloader datasheet’ document and ‘FLIP User Manual’.
2.8.2 Programming with AVR ISP mkII Programmer
The AT90USBxxx can be programmed using specific SPI serial links. This sub sectionwill explain how to connect the programmer.
The Flash, EEPROM and all Fuses and Lock Bits options ISP-programmable can beprogrammed individually or with the sequential automatic programming option.
The AVR ISP mkII programmer is a compact and easy-to-use In-System Programmingtool for developing applications with AT90USBxxx. Due to the small size, it is also anexcellent tool for field upgrades of existing applications.
The AVR ISP programming interface is integrated in AVR Studio®.
To program the device using AVR ISP programmer, connect the 6-wire cable on the ISPconnector of the STK525 as shown in Figure 2-20.
Note: See AVR Studio® on-line Help for information.
Figure 2-20 . Programming from AVR ISP mkII programmer
2.8.3 Programming with STK500
The AT90USBxxx can be programmed using the serial programming mode in the AVRStudio STK500 software. The software interface (In-System Programming of an externaltarget system) is integrated in AVR Studio®.
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To program the device using ISP from STK500, connect the 6-wire cable between theISP6PIN connector of the STK500 board and the ISP connector of the STK525 asshown in Figure 2-18.
Note: See AVR Studio® on-line Help for information.
Note: The high voltage parallel programming mode with STK500 is not available for anSTK525. To reprogram an AT90USBxxx part in parallel mode, use an STK501 extensionboard (AT90USBxxx product pinout is compatible with the STK501 parallel programingmode).
2.8.4 Programming with AVR JTAG ICE
The AT90USBxxx can be programmed using specific JTAG link. This sub-section willexplain how to connect and use the AVR JTAG ICE.
Note: When the JTAGEN Fuse is unprogrammed, the four TAP pins are normal port pins, andthe TAP controller is in reset. When programmed, the input TAP signals are internallypulled high and the JTAG is enabled for Boundary-scan and programming. TheAT90USBxxx device is shipped with this fuse programmed.
Figure 2-21 . Connecting AVR JTAG ICE to STK525
The Flash, EEPROM and all Fuse and Lock Bit options ISP-programmable can beprogrammed individually or with the sequential automatic programming option.
Note: See AVR Studio® on-line Help for information.
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2.9 Debugging
2.9.1 Debugging with AVR JTAG ICE mkII
Every STK525 can be used for debugging with JTAG ICE MK II.
Connect the JTAG ICE mkII as shown in Figure 2-21, for debugging help, please refer toAVR Studio® Help information.
When using JTAG ICE MK II for debugging, and as AT90USBxxx parts are factoryconfigured with the higher security level set, a chip erase operation will be performed onthe part before debugging. Thus the on-chip flash bootloader will be erased. It can berestored after the debug session using the bootloader hex file available from ATMELwebsite.
2.10 Test Points
There are 8 test points implemented, these test points are referred in the full schematicssection.
Config. Pads
ReferenceRelated Signals Function
T1 D+ USB D+ data line
T2 D- USB D- data line
T3 Aref Analog reference
T4 Mic Microphone preamplifier output
T5 3.3V 3.3V internal power supply
T6 5V 5V internal power supply
T7 Gnd Ground
T8 Vbus USB Vbus power supply
STK525 Hardware User Guide 2-23
7608A–AVR–04/06
Using the STK525
2.11 Configuration Pads
Configuration pads are used to disconnect/connect on-board peripherals or elements, theirdefault configuration is: connect.
2.11.1 Configuration Pads Listing
Table 2-5 . Configuration Pads
2.11.2 Configuration Pads - Disconnection
Figure 1. Configuration Pad - Disconnection
2.11.3 Configuration Pads - Connection
Figure 2. Configuration Pad - Re-connection
Config. Pads
Reference
Related Signals
Function
CP1 °c sensor (PF0)This configuration pad is used to disconnect/connect the CTN sensor from STK525.
CP2 pot. (PF1)This configuration pad is used to disconnect/connect the potentiometer from STK525.
CP3 Mic.(PF2)This configuration pad is used to disconnect/connect the microphone preamplifier output from STK525.
Cut Connection
WireDroplet of Solder
2-24 STK525 Hardware User Guide
7608A–AVR–04/06
Using the STK525
2.12 Solder Pads
Solder pads are used to disconnect/connect on-board peripherals or elements, their defaultconfiguration is: disconnect.
2.12.1 Solder Pads Listing
Table 2-6 . Solder Pads
Solder. Pads
Reference
Related Signals
Function
SP1 AVCC/VCC This solder pad can be used to bypass L1.
SP2 NRST/RESET This solder pad can be used to bypass D1.
SP3 3.3VThis solder pad is reserved to connect 3.3V power supply to the N.C pin of Expand0/1
SP4 PD1/CTSThis solder pad allows to enable the logical CTS signal for hardware control flow on RS232 interface.
SP5 PD0/RTSThis solder pad allows to enable the logical RTS signal for hardware control flow on RS232 interface.
SP6 VBUS This solder pad allows to bypass U5 VBUS current limiter.
SP7 RS-CTSThis solder pad allows to enable the physical CTS signal for hardware control flow on RS232 interface.
SP8 RS-RTSThis solder pad allows to enable the physical RTS signal for hardware control flow on RS232 interface.
STK525 Hardware User Guide 2-25
7608A–AVR–04/06
Section 3
Troubleshooting Guide
Figure 3-1 . Troubleshooting Guide
Problem Reason Solution
The Green “VCC-ON” LED is not on
No power supply
Verify the power supply source
Verify the power supply source
STK525 does not work Connect the DC power supply source, or USB interface or STK500.
The AT90USBxxx cannot be programmed
The STK500 ISP header is not connected.
Connect a 6-pin flexible cable from STK500 ISP 6-PIN header to the correct STK525 ISP header (page 21)
The AVR ISP probe is not connected
Connect the AVR ISP 6-PIN header to the correct STK525 ISP header (page 21)
The AVR JTAG ICE probe is not connected
Connect the JTAG ICE 10-PIN header to the correct STK525 JTAG header (page 22)
The memory lock bits are programmed
Erase the memory before programming
The fuse bits are wrongly programmed
Check the fuse bits
Programming too fast with ISP SPI
Check oscillator settings and make sure it is not set higher than SPI clock
AVR Studio does not detect the AVR tool used
Serial/USB cable is not connected, or power is off
Connect serial cable to RS232 (STK500 - AVR ISP) and check power connections
Connect serial cable to USB (JATG ICE MKII, AVR ISPmkIIl) and check power connections
PC COM port is in use
Disable other programs that are using PC COM port.
Change PC COM port
AVR Studio does not detect COM port.
Disable COM port auto-detection in AVR Studio file menu. Force COM port to correct COM port
STK525 Hardware User Guide 3-26
7608A–AVR–04/06
Troubleshooting Guide
STK525 Hardware User Guide 3-27
7608A–AVR–04/06
Section 4
Technical Specifications
� System Unit
– Physical Dimensions................................................. L=119 x W=56 x H=27 mm– Weight ...........................................................................................................70 g
� Operating Conditions
– Internal Voltage Supply .....................................................................2.7V - 5.5V– External Voltage Supply ..........................................................9V -15V (100mA)
� Connections
– USB Connector ......................................................................Mini AB receptacle– USB Communications .......................................................Full speed/low speed
– RS 232C Connector .............................................................9-pin D-SUB female– RS 232C Communications Maximum Speed........................................ 250 kbps
STK525 Hardware User Guide 4-28
7608A–AVR–04/06
Section 5
Technical Support
For Technical support, please contact [email protected]. When requesting technicalsupport, please include the following information:
� Which target AVR device is used (complete part number)
� Target voltage and speed
� Clock source and fuse setting of the AVR
� Programming method (ISP, JTAG or specific Boot-Loader)
� Hardware revisions of the AVR tools, found on the PCB
� Version number of AVR Studio. This can be found in the AVR Studio help menu.
� PC operating system and version/build
� PC processor type and speed
� A detailed description of the problem
STK525 Hardware User Guide 5-29
7608A–AVR–04/06
Section 6
Complete Schematics
On the next pages, the following documents of STK525 revision 4381A are shown:
� Complete schematics,
� Assembly drawing,
� Bill of materials.
� Default configuration summary
STK525 Hardware User Guide 6-30
7608A–AVR–04/06
Complete Schematics
Figure 6-1 . Schematics, 1 of 5
C7
1uF
VB
US
SW
2E
xt R
eset
PE3
AV
CC
PD
[7..
0]P
D[7
..0]
NC
KA
D1
BA
T54/
SO
TIN
T 0/
2
PA0
UC
AP
Cap
acito
rC
lose
d to
the
MC
U
VC
C
PA1
R4
0
PF7S
P2
PA
3
UGND
VC
C
PA
[7..0
]P
A[7
..0]
PA
[7..0
]
PA2
PE7
RESET
PA
4
Reset Circuit
Force Bootloader Execution
VC
C
R3
47k
C8
220n
F PE
2
UV
CO
N
VB
US
Impo
rtan
t No
te:
U1 i
s mo
unte
d th
roug
h a
TQFP
64 Z
IF s
ocke
t
PA
5P
A6
C1
100n
F
UC
AP
PA
7
Clo
se S
olde
r P
adTo
use
par
alle
l pro
g m
ode
(12V
on
Res
et P
in)
SW
1H
WB
PE
2
PF
[7..
0]
PC
7
UG
ND
R7
0
AG
ND
R6
0
1
TP1
D+
D-
D+
1
TP2
D-
1
TP3
AR
EF
AR
EF
RE
SIS
TOR
SC
LOS
ED
TO
TH
E D
EV
ICE
VC
C
PE4
PB
[7..
0]P
B[7
..0]
PB
[7..0
]
PE5
PC
6
VC
CA
VC
C
L1
BL
M-2
1A
10
2S
SP
1
C2
100n
F
Title
Size
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umen
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umbe
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Dat
e:S
heet
of
11.
0
CP
U
A4
14
Wed
nesd
ay,
Feb
ruar
y 1
5, 2
006
PC
5P
C4
VC
C
PB
0
VC
C
Fer
rite
& c
apac
itors
clos
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o th
e M
CU
PB
1
1-V
_BU
S
3-D
+2-
D-
4-ID
5-G
ND
SH
IELD
SH
IELD
SH
IELD
SH
IELD
US
B_M
iniA
BF
J1
PB
2P
C3
R5
47k
PE
72
UV
cc3
D-
4
D+
5
UG
ND
6
UC
AP
7
VB
US
8
PE
39
PB
010
PB
111
PB
212
PB
313
PB
414
PB
515
PB
616
PB717
PD025
PD126
PD227
PD328
PD429
PD530
PD631
PD732
PE418
PE519
AREF62
RESET20
GND53
GND63
GND22
XTAL223
XTAL124
PE
033
PE
134
PE
61
PE
243
PC
035
PC
136
PC
237
PC
338
PC
439
PC
540
PC
641
PC
742
PA
744
PA
645
PA
546
PA
447
PA
348
PA249 PA150 PA051
PF754 PF655 PF556 PF457 PF358 PF259 PF160 PF061
VCC52
VCC21
AVCC64
AT9
0US
B12
8
U1
PB
3
UV
CO
NP
E7
C5
100n
F
VC
C
DE
CO
UP
LIN
G C
AP
AC
ITO
RS
CLO
SE
D T
O T
HE
DE
VIC
EM
CU
Pin
3V
BU
S
PC
2
PB
4
Y1 8M
Hz
C11
15pF
C10
15pF
PC
1
PB
5
VB
US
AR
EF
PC
0
PB
6
PE
[7..
0]
PE
1
PB
7
PF0
PE
0
STK5
25 M
EZZA
NINE
FO
R ST
K500
C9
220n
F
UG
ND
UG
ND
UG
ND
UG
ND
UG
ND
PC
[7..
0]P
C[7
..0]
C3
100n
F
PF1
R2
22
R1
22
RE
SE
T
D+
C4
100n
F
D-
UID
PE
3
PF2
PD0
XTAL2
PD1PD2
PF3
PD3
AG
ND
CR
1
PG
B00
1060
3
PA
[7..0
]P
A[7
..0]
PA
[7..0
]
CR
2
PG
B00
1060
3
PE0
PD4
XTAL1
PD5PD6
DE
CO
UP
LIN
G C
AP
AC
ITO
RS
CLO
SE
D T
O T
HE
DE
VIC
EM
CU
Pin
52
PE1
PD7
PF4
XTA
L2
UC
AP
NR
ST
UV
CC
D+
D-
RE
SIS
TOR
SC
lose
d to
the
MC
U
PE2
PF5
RE
SE
T
C6
100n
F
VC
C
PA
[7..
0]
AR
EF
DE
CO
UP
LIN
G C
AP
AC
ITO
RS
CLO
SE
D T
O T
HE
DE
VIC
EM
CU
Pin
21
PF6
XTA
L1
STK525 Hardware User Guide 6-31
7608A–AVR–04/06
Complete Schematics
Figure 6-2 . Schematics, 2 of 5
Q1
BC
847B
C14
100n
FC
13
100n
F
PE
0P
E2
PC
6P
C4
PC
5P
C2
PC
0P
C1
PC
3
PC
7
PE
1
R9
10k
GN
D1
GN
D2
AU
XI0
3A
UXO
04
CT7
5C
T66
CT5
7C
T48
CT3
9C
T210
CT1
11B
SE
L212
(n.c
.)13
RE
F14
NR
ST
15P
E2
16
PE
117
PE
018
GN
D19
GN
D20
VTG
21V
TG22
PC
723
PC
624
PC
525
PC
426
PC
327
PC
228
PC
129
PC
030
PA
731
PA
632
PA
533
PA
434
PA
335
PA
236
PA
137
PA
038
GN
D39
GN
D40
CO
N 2
x20
J3 EXP.
CO
N 0
XTA
L2
PD
[7..0
]
GN
D1
GN
D2
AU
XI1
3A
UXO
14
DA
TA7
5D
ATA
66
DA
TA5
7D
ATA
48
DA
TA3
9D
ATA
010
DA
TA1
11D
ATA
912
SI
13S
O14
SC
K15
CS
16
XT1
17XT
218
VTG
19V
TG20
GN
D21
GN
D22
PB
723
PB
624
PB
525
PB
426
PB
327
PB
228
PB
129
PB
030
PD
731
PD
632
PD
533
PD
434
PD
335
PD
236
PD
137
PD
038
GN
D39
GN
D40
CO
N 2
x20
J2 EXP.
CO
N 1
Title
Size
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umen
t N
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rR
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Dat
e:S
heet
of
<Doc
>1.
0
STK
500
Exp
and
conn
ecto
rs
A4
24
Tues
day
, Ja
nuar
y 1
7, 2
006
ST
KN
C
Impo
rtan
t:D
efau
lt co
nfig
urat
ion:
ope
nre
serv
ed f
or f
utur
e m
ass
stor
age
exte
nsio
n
3.3V
SP
3
STK5
25 M
EZZA
NINE
FO
R ST
K500
NR
ST
STK
NC
VTG
XTA
L1
PA
0
R8
2k
PB
7
PB
3P
B5 P
D5
PD
7P
B1
PB
6
PD
1P
D3
PB
2P
B4
PD
6PB
0
PD
2P
D4
C12
1nF
PD
0
AR
EF
12
JP3
STK
ARE
F
VTG
RE
F
XT
2X
T1
PE
[2..0
]
VTG
VTG
PE
[2..
0]
VTG
PC
[7..0
]P
C[7
..0]
PB
[7..
0]
PD
[7..
0]
PA
[7..
0]P
A[7
..0]
PA
5P
A7
PA
6
PA
1P
A3
PA
4
12
JP1
STK
X1
PA
2
12
JP2
STK
X2
PB
[7..0
]
6-32 STK525 Hardware User Guide
7608A–AVR–04/06
Complete Schematics
Figure 6-3 . Schematics, 3 of 5
Data Flash 3.3V
LEDs
3.3V
PF
[7..
0]
D
EC
OU
PLI
NG
CA
PA
CIT
OR
CLO
SE
TO
TH
E C
ON
NE
CTO
R
R19
PO
T 10
0k
Sel
ect
5
Left
7
Up
3
Rig
ht6
Dow
n4
Com
11
Com
22
SW
3
TPA
511G
PF
[7..
0]
Temp Sensor
PB
[7..
0]
R18
NC
P18
WF
104J
03R
B
594837261
1011
P1
SU
B-D
9 F
EM
ALE
RS
232
1 2 3 4
J7
PF
Spa
re (
Not
mou
nted
)
RS232 Interface
JTAG Interface
RS
-CT
S
3.3V
Serial ISP
Interface
PE
[7..
0]
CP
1
VC
C
R16
100k
STK5
25 M
EZZA
NINE
FO
R ST
K500
VC
C3.
3V
BU
SY
1
RE
SE
T2
WP
3V
CC
6
GN
D7
CS
11
SC
K12
SI
13
SO
14
U2
AT4
5DB
321C
TS
OP
28
Microphone Preamplifier Interface
PF0
VC
C
PB
[7..
0]
CT
S
Title
Size
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umen
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umbe
rR
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Dat
e:S
heet
of
<Doc
>1.
0
Inte
rfac
es
A4
34
Tues
day
, Ja
nuar
y 1
7, 2
006
C20
100n
F
RT
S
CP
2
R23
100k
.11
.12
.10
.9
.8
.7
.13
.14
.15
.16
C1+
1V
+2
C1-
3
C2+
4
C2-
5V
-6
RS
232
TTL
GN
D
VC
C
U3
MA
X323
2R
S23
2 B
UF
FE
R
C17
100n
F
C16
100n
FC
1810
0nF
PF1
C19
100n
F
RxD
PD
2
DE
CO
UP
LIN
G C
AP
AC
ITO
R C
LOS
E T
O T
HE
DE
VIC
E
RS
-TxD
RS
-TxD
RS
-TxD
RS
-TxD
RS
-TxD
RS
-TxD
RS
-TxD
RS
-TxD
RS
-RxD
PD
[7..
0]
VC
C
PF
0
1
TP4
Mic
VC
C
DE
CO
UP
LIN
G C
AP
AC
ITO
R C
LOS
E T
O T
HE
DE
VIC
E
C15
100n
F
PF
1
SP
4
PF
2
SP
5
VC
C
Cau
tion
Dat
aFla
sh
Fix
3V
Pow
er s
uppl
y O
nly
PF
3
PB
[7..
0]
C26
100n
F
RE
SE
T
R11
100k
CP
3
D
EC
OU
PLI
NG
CA
PA
CIT
OR
CLO
SE
TO
TH
E C
ON
NE
CTO
R
PB
5
PD
O1
VC
C2
SC
K3
PD
I4
RE
SE
T5
GN
D6
CO
N 2
x3
J5 ISP
CO
N
TCK
1G
ND
2
TDO
3V
CC
4
TMS
5R
ES
ET
6
VC
C7
n.c.
8
TDI
9G
ND
10
CO
N 2
x5
J4 JTA
G C
ON
C21
100n
F
C23
100n
F
PD
1
PF4
PF4
PF6
PF7
PF5
PF5
RE
SE
TP
B1
R17
0
PB
2
PB
3
3.3V
PB
6
PD
0
VC
C
PD
3T
XD
SP
7
PB
7
567
84 +-
U4B
LMV
358
321
84 +-
U4A
LMV
358
R27
0R
2622
kR
2510
k
R24
100k
PB
4
+C
25
1uF
R21
100k
R28
100k
C22
220p
F
+
C24
4.7u
F
3.3V
R20
2.2k
MIC
1
MIC
RO
PH
ON
E
R22
100k
DE
CO
UP
LIN
G C
AP
AC
ITO
R C
LOS
E T
O T
HE
DE
VIC
E
PE
4
PB
1
R10
100k
PF2
In-li
ne G
roup
ed L
ED
s
RE
SE
T
D2
TOP
LED
LP
M67
6
LED
0 (g
reen
) D3
TOP
LED
LP
M67
6
LED
1 (g
reen
) D4
TOP
LED
LP
M67
6
LED
2 (g
reen
) D5
TOP
LED
LP
M67
6
LED
3 (g
reen
)
PB
2
R12
1k
R13
1k
PE
5
R14
1k
R15
1k
PD
4
PB
3
PD
5
PD
7
PD
[7..
0]
PD
6
SP
8
RS
-RT
S
Joystick Interface
STK525 Hardware User Guide 6-33
7608A–AVR–04/06
Complete Schematics
Figure 6-4 . Schematics, 4 of 5
-
C30
4.7u
F
VTG
IN GN
D
OU
T
U8
LM34
0
VB
US
gen
erat
or f
or O
TG/H
OS
T m
ode
1�F
<C
ap V
bus
< 6�
F O
TG S
peci
fica
tion
VB
US
R29
10k
C28
4.7u
F
D7
LL41
48
C27
100n
F
GND1
IN1
2
IN2
3
EN
4O
C5
OU
T18
OU
T27
OU
T36
U5
TPS
2041
A
12
JP4
M1FD
V30
4P/F
AI
R33
100k
3.3V
5V5V
- C31
4.7u
F
1
TP5
3.3V
JP n
ot m
ount
ed,
rese
rved
for
fut
ure
mas
s st
orag
e ex
tens
ion
in s
tand
alo
ne m
ode
TPS
2041
A V
bus
Icc
limite
r op
tionn
alW
hen
Not
Mou
nted
Clo
se S
olde
r P
ad
JP C
lose
d fo
r 3.
0<V
cc<3
.3
1
TP6
5V
R31
124k
1%
1
TP8
VB
US
U6o
ut=1
.25*
(1+R
28/R
29)
1 2
JP5
VTG
STK
VB
US
VBUS
3.3V
R30
100k
1%
Ext
VC
C1
TP7
GN
D
SP
6
3.3V
STK5
25 M
EZZA
NINE
FO
R ST
K500
STK
Ext
UC
AP
3.3V
Q2
BC
847B
3.3V
D8
TOP
LED
LP
M67
6PO
WER
LED
(RED
)
R34
1k
Title
Size
Doc
umen
t N
umbe
rR
ev
Dat
e:S
heet
of
<Doc
>1.
0
PO
WE
R
A4
44
Tues
day
, Ja
nuar
y 1
7, 2
006
5V
C32
220n
F
12
34
56
78
JP6
VC
C S
ourc
e
VC
C
-
C34
4.7u
F
21 3
JP7
VBU
S ge
n
D6
LL41
48
R32
10k
R35
100k
1%
3
1
4
2-
+
U7
DF
005S
3 2 1
J6
CO
NN
EC
TOR
JA
CK
PW
RE
xt P
ower
Sup
ply
C33
100n
FC29
33nF
UV
CO
N
VB
US
OU
T1
IN2
GN
D3
OU
T4
FA
ULT
8S
HD
N7
CC
6
SE
T5
U6
LP39
82
6-34 STK525 Hardware User Guide
7608A–AVR–04/06
Complete Schematics
Figure 6-5 . Assembly Drawing, 1 of 2 (component side)
Figure 6-6 . Assembly Drawing, 2 of 2 (solder side)
STK525 Hardware User Guide 6-35
7608A–AVR–04/06
Complete Schematics
Table 6-1 . Bill of material
Item Q.ty Reference Part Tech. Characteristics Package
1 2 CR1,CR2 PGB0010603 ESD protection CASE 0805
2 19C1,C2,C3,C4,C5,C6,C13,C14,C15,C16,C17,C18,C19,C20,C21,C23,C26,C27,C33
100nF 50V-10% Ceramic CASE 0805
3 2 C7,C25 1uF 10Vmin ±10% EIA/IECQ 3216
4 3 C8,C9,C32 220nF 50V-10% Ceramic CASE 0805
5 2 C10,C11 15pF 50V-5% Ceramic CASE 0805
6 1 C12 1nF 50V-5% Ceramic CASE 0805
7 1 C22 220pF 50V-5% Ceramic CASE 0805
8 5 C24,C28,C30,C31,C34 4.7uF 10Vmin ±10% EIA/IECQ 3216
9 1 C29 33nF 50V-5% Ceramic CASE 0805
10 3 CP1, CP2, CP3 Configuration Pad
11 1 D1 BAT54/SOT Vf=0.3V SOT23
12 5 D2,D3,D4,D5,D8 TOPLED LP M676Green
I=10 mA_PLCC-2
13 2 D6,D7 LL4148 i=200mA max LL-34
14 5 JP1,JP2,JP3,JP4,JP5 JUMPER 1x2 Need 1 shunt 0,1" pitch
15 1 J1 USB_MiniABFUSB mini AB receptacle Surface mount
16 2 J2,J3 CON 2x20
17 1 J4 CON 2x5
18 1 J5 CON 2x3
19 1 J7 CON 2x2 Not Mounted
20 1 JP6 JUMPER 2x4 Need 1 shunt 0,1" pitch
21 1 J6CONNECTOR JACK PWR
Int.Diam=2.1mm PCB Embase
22 1 JP7 JUMPER 3x1
23 1 L1 BLM-21A102SFERRITE BEAD
1 KOhms at 100 MHzCASE 0805
24 1 MIC1 MICROPHONE Electret Cap Mic
25 1 M1 FDV304P/FAI MOSFET P SOT23
26 1 P1 SUB-D9 FEMALE 90° with harpoons
27 2 Q1,Q2 BC847B NPN
IC peak=200mASOT23
28 2 R1,R2 22 1/16W-5% SMD CASE 0602
29 2 R3,R5 47k 1/16W-5% SMD CASE 0603
30 5 R4,R6,R7,R17,R27 0 CASE 0603
31 1 R8 2k CASE 0604
32 4 R9,R25,R29,R32 10k 1/16W-5% SMD CASE 0603
6-36 STK525 Hardware User Guide
7608A–AVR–04/06
Complete Schematics
6.0.1 Default Configuration - Summary
Table 6-2 . Default Configuration summary
33 9 R10,R11,R16,R21,R22,R23,R24,R28,R33 100k 1/16W-5% SMD CASE 0603
34 5 R12,R13,R14,R15,R34 1k 1/16W-5% SMD CASE 0603
35 1 R18 NCP18WF104J03RB 100K - ß=4250 CASE 0603
36 1 R19 POT 100k PT10MH104ME
37 1 R19 Button Pot Button
38 1 R20 2.2k 1/16W-5% SMD CASE 0603
39 1 R26 22k 1/16W-5% SMD CASE 0603
40 1 R30, R35 100k 1% 1/16W-1% SMD CASE 0603
41 1 R31 120k 1% 1/16W-1% SMD CASE 0603
42 6 SP1,SP2,SP3,SP4,SP5,SP6 SolderPad (NA) (NA)
43 2 SW1,SW2 PUSH-BUTTON 6x3.5mm - 1.6N
44 1 SW3 TPA511G 4+1 ways joystick CMS
45 8 TP1,TP2,TP3,TP4,TP5,TP6, TP7, TP8 TEST POINT Diam.=1.32mm
46 1 U1 AT90USBxxx TQFP64
47 1 U1 Socket TQFP64 ZIF
48 1 U2 AT45DB321C TSOP28
49 1 U3 MAX3232ECAE+ SSOP16
50 1 U4 LMV358 SO8
51 1 U5 TPS2041A SOIC8
52 1 U6 LP3982Low Drop Out
Vin Max 6V, 300mAMSOP8
53 1 U7 DF005S Bridge rectifier See DS
54 1 U8 LM340 Reg 5V CMS SOT223
55 1 Y1 8MHz CRYSTAL H=4mm HC49/4H
Item Q.ty Reference Part Tech. Characteristics Package
Name Ref. Function State
Jumpers
STKX1 JP1 XTAL Configuration OFF
STKX2 JP2 XTAL Configuration OFF
Aref JP3 STK500 Analog Ref OFF
VTG33 JP4 Short 3.3V to VTG (Mass storage extension board)
OFF
UCAP JP5 Short UCAP with Uvcc OFF
Vcc Src JP6 Vcc Selection 3.4 shorted
Vbus Gen JP7 VBUS generation selection (host mode) 2.3 shorted
Solder PADS
STK525 Hardware User Guide 6-37
7608A–AVR–04/06
Complete Schematics
SP1 Bypass L1 OPEN
SP2 OPEN
SP3 3.3V on Expand 0 NC pin OPEN
SP4 CTS OPEN
SP5 RTS OPEN
SP6 Bypass limiter OPEN
SP7 RS232 hardware control enable OPEN
SP8 RS232 hardware control enable OPEN
Configuration PADS
CP1 Bypass CTN in on PF0 CLOSE
CP2 Bypass Potentiometer ADC in on PF1 CLOSE
CP3 Bypass Mic In on PF2 CLOSE
Name Ref. Function State
6-38 STK525 Hardware User Guide
7608A–AVR–04/06
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