ST STM32303C-EVAL User manual

February 2013 Doc ID 023581 Rev 2 1/58
UM1567
User manual
STM32303C-EVAL evaluation board
Introduction
The STM32303C-EVAL evaluation board has been designed as a complete demonstration
and development platform for STMicroelectronic's ARM cortex-M4 core-based
STM32F303VCT6 microcontrollers. It features two I2Cs, three SPIs, five USARTs, one
CAN, four 12-bit ADCs, two 12-bit DACs, internal 40-KByte Data SRAM, 8-KByte Program
SRAM and 256-KByte Flash, Touch sensing, USB FS, JTAG debugging support. This
evaluation board can be used as the reference design for user application development but
it is not considered as a final application.
The full range of hardware features on the board help you to evaluate all peripherals (USB
FS, USART, Audio DAC and ADC, TFT color LCD, IrDA, LDR, MicroSD card, Motor control
connectors, Humidity Sensor, High Brightness LED, CAN, IR, EEPROM, Touch Sensing
Buttons & Temperature Sensor… etc.) and to develop your own applications. Extension
headers make it possible to easily connect a daughter board or a wrapping board for your
specific application.
An ST-LINK/V2 is integrated on the board as an embedded in-circuit debugger and
programmer for the STM32 MCU.
Figure 1. STM32303C-EVAL evaluation board
Table 1 lists the evaluation tools concerned by this user manual.
Table 1. Applicable tools
Type Applicable tools
Evaluation tools STM32303C-EVAL
www.st.com

Contents UM1567
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Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Demonstration software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Delivery recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Development and debug support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 Clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 Reset source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5 Boot option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.6 Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.7 USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.8 RS232, RS-485 and IrDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.9 Touch-sensing buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.10 MicroSD card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.11 Serial EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.12 RF EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.13 EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.14 CAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.15 IR LED and IR receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.16 High brightness LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.17 Humidity sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.18 Comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.19 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.20 Display and input devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.21 Motor control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.1 RF EEPROM daughter board connector (CN1) . . . . . . . . . . . . . . . . . . . . 26

UM1567 Contents
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3.2 Motor control connector (CN2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3 CAN D-type 9-pin male connector (CN3) . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4 Motor control connector (CN4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.5 ST-LINK/V2 USB type-B connector (CN5) . . . . . . . . . . . . . . . . . . . . . . . . 30
3.6 Daughter board extension connectors (CN6 and CN7) . . . . . . . . . . . . . . 30
3.7 RS232 and RS485 connector (CN8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.8 ETM Trace debugging connector (CN9) . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.9 JTAG/SWD connector (CN10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.10 Audio jack (CN11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.11 User USB type-B connector (CN12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.12 ST-LINK/V2 programming connector (CN13) . . . . . . . . . . . . . . . . . . . . . . 36
3.13 Power connector (CN14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.14 TFT LCD connector (CN15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.15 MicroSD connector (CN16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Appendix A STM32303C-EVAL I/O assignment . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Appendix B Mechanical dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

List of tables UM1567
4/58 Doc ID 023581 Rev 2
List of tables
Table 1. Applicable tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Third-party support of ST-LINK/V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3. Power supply jumper settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4. Power mode related jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5. Low voltage limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 6. 32 kHz crystal X1 related solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7. 8 MHz crystal X2 related solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Boot-related switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 9. Boot0-related jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 10. Audio-related jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 11. RS232, RS485 and IrDA related jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 12. RS485 related solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 13. Touch-sensing button related solder bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 14. EEPROM Related Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 15. CAN related jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 16. Humidity sensor related jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 17. Temperature sensor related jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 18. LCD modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 19. Motor control related jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 20. Motor control related switches and solder bridges in OAM position . . . . . . . . . . . . . . . . . . 24
Table 21. Motor control related switches and solder bridges in PGM position . . . . . . . . . . . . . . . . . . 25
Table 22. RF EEPROM daughter board connector (CN1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 23. Motor control 1 connector (CN2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 24. CAN D-type 9-pin male connector (CN3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 25. Motor control 2 connector (CN4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 26. USB type-B connector (CN5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 27. Daughter board extension connector (CN6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 28. Daughter board extension connector (CN7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 29. RS232 and RS485 connector (CN8) with ISP support . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 30. ETM trace debugging connector (CN9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 31. JTAG/SWD debugging connector CN10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 32. USB type-B connector (CN12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 33. MicroSD connector (CN16). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 34. STM32303C-EVAL I/O assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 35. Mechanical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 36. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

UM1567 List of figures
Doc ID 023581 Rev 2 5/58
List of figures
Figure 1. STM32303C-EVAL evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Hardware block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. STM32303C-EVAL evaluation board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 4. STM32303C-EVAL comparator features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 5. Resistor positions on the PCB board: even number removing . . . . . . . . . . . . . . . . . . . . . . 22
Figure 6. Resistor positions on the PCB board: odd number mounting. . . . . . . . . . . . . . . . . . . . . . . 23
Figure 7. RF EEPROM daughter board connector (CN1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 8. Motor control 1 connector (CN2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 9. CAN D-type 9-pin male connector (CN3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 10. Motor control 2 connector (CN4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 11. USB type-B connector (CN5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 12. RS232 and RS485 connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 13. ETM Trace debugging connector (CN9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 14. JTAG/SWD debugging connector (CN10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 15. USB type-B connector (CN12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 16. Power supply connector (CN14). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 17. MicroSD connector (CN16). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 18. STM32330C-EVAL board (MB1019) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 19. STM32330C-EVAL MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 20. STM32330C-EVAL Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 21. STM32330C-EVAL RS232, RS485 and IrDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 22. STM32330C-EVAL Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 23. STM32330C-EVAL Motor control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 24. STM32330C-EVAL CAN, IR, High-brightness LED and Humidity sensor . . . . . . . . . . . . . 45
Figure 25. STM32330C-EVAL LCD, SDCard and Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 26. STM32330C-EVAL I2C peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 27. STM32330C-EVAL peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 28. STM32330C-EVAL ST-LINK (JTAG only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 29. STM32330C-EVAL JTAG and Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 30. TM32330C-EVAL touch sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 31. Color LCD daughter board (MB895). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 32. Mechanical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Overview UM1567
6/58 Doc ID 023581 Rev 2
1 Overview
1.1 Features
■Four 5 V power supply options: Power jack, ST-LINK/V2 USB connector, User USB
connector or daughter board
■I2S Audio DAC, stereo audio jack which supports headset with microphone
■2-Gbyte or more SPI interface MicroSD card
■I2C compatible serial interface temperature sensor, EEPROM and RF EEPROM
■RS232 and RS485 communication
■IrDA transceiver
■JTAG/SWD and ETM trace debug support, ST-LINK/V2 embedded
■1-Mbit SPI serial Flash memory
■240x320 TFT color LCD connected to the SPI interface
■Joystick with 4-direction control and selector
■Reset, Tamper or Key button
■4-color user LEDs and high brightness LED
■Humidity sensor
■Extension connectors for daughter board or wrapping board
■MCU voltage choice: 3.3 V or adjustable from 2.0 V to 3.6 V
■USB FS connector
■Touch-sensing buttons
■RTC with backup battery
■CAN2.0A/B compliant connection
■Light-dependent resistor (LDR)
■IR LED and receiver
■Potentiometer
■2 motor control connectors
1.2 Demonstration software
The demonstration software is preloaded in the board's Flash memory for an easy
demonstration of the device peripherals in standalone mode. For more information and to
download the latest version available, please refer to the STM32303C-EVAL demonstration
software available on www.st.com.
1.3 Order code
To order the STM32F303VCT6 evaluation board, use the STM32303C-EVAL order code.

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1.4 Delivery recommendations
Before using the board for the first time, please verify that nothing was damaged during
shipment and that no components are unplugged or lost.
When the board is extracted from its plastic bag, please check that no component remains
in the bag.
The main components to verify are:
1. The 8 MHz crystal (X2) which may have been removed from its socket by a shock.
2. The MicroSD card which may have been ejected from the CN16 connector (right side
of the board).
3. The dual-interface EEPROM board (ANT7-M24LR-A) which may have been unplugged
from the CN1 connector (top left corner of the board).
For all information concerning the version of the MCU used on the board, its specification
and possible related limitations, please visit the ST web site to download the relevant data
sheet and erratasheet.
Warning: This equipment contains parts (principally an LCD), subject to
be damaged by electrostatic discharge (ESD). Before touching
the LCD or its connector (CN1 on MB895), use one of these
following ESD precautionary procedures:
Wear a ground strap. The function of such strap is to rapidly
and safely dissipate personnel static charge to the ground.
Touch the ground before all other nets or components on
board. The easiest way to proceed is to touch with a finger the
shield available on DB9 connectors (CN3 & CN8), USB
connector (CN5) or uSD card connector (CN16).

Hardware layout and configuration UM1567
8/58 Doc ID 023581 Rev 2
2 Hardware layout and configuration
The STM32303C-EVAL evaluation board has been designed around the STM32F303VCT6
microcontroller (100-pin TQFP package). The hardware block diagram in Figure 2 illustrates
the connection between the STM32F303VCT6 microcontroller and its peripherals (color
LCD, touch sensing buttons, USB FS connector, motor control connectors, temperature
sensor, USART, IrDA, Audio, EEPROM,RF EEPROM, MicroSD card and embedded
ST-LINK). Figure 3 helps to locate these features on the actual evaluation board.
Figure 2. Hardware block diagram
Note: ‘o’ = I/O shared with Motor Control.
GPIO
Comparator
TS
controller
USB FS
I2C
USART1
JTAG
Potentiometer
Joystick
LEDs
Key
button
Photo-R
Touch Sensing
Buttons
USB
connector
Temperature
Sensor
EEPROM
RF EEPROM
connector
Voltage
translator
RS232
transceiver
IrDA
transceiver
RS232/RS485
connector
TFT color
LCD
SPI2
MicroSD
card
I2S
Audio
Codec &
Amplifier
Embedded
ST -LINK/V2
USB TypeB
connector
JTAG & Trace
connector
2.0V to 3.6V
adjustable
regulator
3.3V
regulator
Extension
connector for
GPIOs
Microphone
STM32F303VCT6
EEPROM
High current
LEDs
Humidity
Sensor TIM
CAN driver
& Connector CAN
IR LED &
IR receiver
IRTIM
PWM
Voltage
translator
Motor Control
connector 1
Motor Control
connector 2
Comparator
Comparator
PWM
PWM
RS485
transceiver
Headset Jack
MS30710V1

UM1567 Hardware layout and configuration
Doc ID 023581 Rev 2 9/58
Figure 3. STM32303C-EVAL evaluation board layout
..

Hardware layout and configuration UM1567
10/58 Doc ID 023581 Rev 2
2.1 Development and debug support
Version 2 of ST-LINK, called ST-LINK/V2, is embedded on the board. This tool allows
program loading and debugging of the STM32 on board using a JTAG or SWD interface.
The third-party debug tools are also supported by the JTAG/SWD connector, CN10, or the
ETM Trace connector, CN9.
A specific driver needs to be installed on your PC for communication with embedded ST-
LINK/V2.The install shield called ST-LINK_V2_USBdriver.exe is available at
www.st.com/stlinkv2.
Third-party toolchains, Atollic TrueSTUDIO, KEIL MDK-ARM, IAR EWARM and Tasking VX-
Toolset support ST-LINK/V2 according to Table 2.
The embedded ST-LINK/V2 is connected to the PC via a standard USB cable connected to
connector CN5.The bicolor LED LD8 (COM) advises on the status of the communication as
follows:
●Slow blinking red/off: at power on before USB init
●Fast blinking red/off: after the first correct communication between PC and ST-Link/V2
(enumeration)
●Red LED on: when the initialization between PC and ST-LINK/V2 has been successful
●Green LED on: after a successful target communication initialization
●Blinking red/green: during communication with target
●Red on: communication finished and OK
●Orange on: communication failure
Note: The board can be powered via CN5 (Embedded ST/LINK/V2 USB connector) even if an
external tool is connected to CN9 (ETM Trace connector) or CN10 (External JTAG & SWD
connector).
R111 needs to be removed when using ETM 4-bit function. In this case, the key button does
not work.
Table 2. Third-party support of ST-LINK/V2
Third party Toolchain Version
Atollic TrueSTUDIO 2.1
IAR EWARM 6.20
Keil MDK-ARM 4.20
TASKING VX-toolset for ARM Cortex-M 4.0.1

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2.2 Power supply
The STM32303C-EVAL evaluation board has been designed to be powered by 5 V DC
power supply and to be protected by PolyZen from wrong power plug-in event. The
evaluation board can be configured to use any of the four following sources of power supply:
●5 V DC power adapter connected to CN14, the power jack on the board (Power supply
unit (PSU) on silkscreen of JP14). The external power supply is not provided with the
board.
●5 V DC power with 500 mA limitation from CN5, the USB type B connector of ST-
LINK/V2 (USB 5 V power source on silkscreen of JP14 ( STlk)).
●5V DC power with 500mA limitation from CN12, the USB type B connector (USB 5V
power source on silkscreen of JP14 (USB)).
●5V DC power from CN6 & CN7, the extension connectors for daughter board (daughter
board power source on silkscreen of JP14 (D5V)).
The power s4upply is configured by setting the related jumpers JP14, JP15, JP16 and JP17
as described in Table 3 .
Table 3. Power supply jumper settings
Jumper Description Setting
JP14
STlk
PSU
U5V D5V
JP14 is used to select one of the four possible power supply resources.
For power supply from the daughter board connectors (CN6 and CN7) to
STM32303C-EVAL only, JP14 is set as shown to the right:
For power supply from USB (CN12) to STM32303C-EVAL only, JP14 is set as
shown to the right:
For power supply jack (CN14) to the STM32303C-EVAL only, JP14 is set as
shown to the right:
For power supply from USB connector of ST-LINK/V2 (CN5) to STM32303C -
EVAL only, JP14 is set as shown to the right (default setting):
For power supply from power supply jack (CN14) to both STM32303C -EVAL and
daughter board connected on CN6 and CN7, JP14 is set as shown to the right
(the daughter board must not have its own power supply connected):
JP16
Vbat is connected to the battery when JP16 is set as shown to the right:
Vbat is connected to VDD power when JP16 is set as shown to the right (default
setting):

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Note: Though technically adjustable from 2.0 V to 3.6 V, VDD has been designed to adjust from
2.1 V to 3.5 V considering some peripheral component specifications.
LED LD8 is lit when the STM32303C-EVAL evaluation board is correctly powered by 5 V.
A total of three power modes are supported on the board, and can be configured by setting
the related jumpers JP15 and JP17 as described in Table 4 and the Note below.
●Mode1: VDD and VDDA were connected together and powered by fixed 3.3 V.
●Mode2: VDD and VDDA were connected together and powered by an adjustable
voltage from 2.0 V to 3.6 V.
●Mode3: VDD is powered by an adjustable voltage from 2.0 V to 3.6 V while VDDA is
powered by fixed 3.3 V.
JP15
VDD is connected to fixed +3.3 V DC power when JP15 is set as shown to the
right (default setting):
VDD is connected to adjustable DC power from 2.0 V to 3.6 V when JP15 is set
as shown to the right:
JP17
VDDA power is connected to VDD when JP17 is set as shown to the right (default
setting):
VDDA power is connected to fixed +3.3 V DC power when JP17 is set as shown
to the right:
Table 3. Power supply jumper settings (continued)
Jumper Description Setting
Table 4. Power mode related jumpers
Power mode Power mode configuration MCU IDD
measurement
JP15 JP17
Mode1
OK
NOT allowed
Mode2 OK
Mode3 NOT allowed

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Note: MCU IDD measurement can be done by the current meter which is mounted on JP12 when it
is open.
JP11 must be open (disconnect VDDA from all analog power VDD_ANA connected to the
analog circuit) for MCU IDD measurement.
Due to the characters of some peripheral components' specification, the low voltage
limitations related to the operating voltage of the peripherals (a component will not work
correctly when the power level is under the low voltage limitation) are shown in Table 5.
Note: When an external DC 5V power supply is used to power the STM32303C-EVAL, it needs to
be connected to CN14 after verifying the correct polarity as explained in Section 3.13.
Caution: RISK OF EXPLOSION IF THE BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.
2.3 Clock source
Two clock sources are available on the STM32303C-EVAL evaluation board for
STM32F303VCT6 and RTC embedded:
●X1, 32 kHz crystal for embedded RTC
●X2, 8 MHz crystal with socket for the STM32F303VCT6 microcontroller; it can be
removed from the socket when an internal RC clock is used.
Table 5. Low voltage limitation
Peripheral Component I/O name Low voltage limitation
USB CN12 USB 3V
CAN CN3 CAN 3V
Temperature sensor U1 I2C2 2.25V
Table 6. 32 kHz crystal X1 related solder bridges
Solder bridge Description
SB12
PC14 is connected to the 32 KHz crystal when SB12 is open (default setting).
PC14 is connected to the extension connector CN6 when SB12 is closed. In such
a case, R196 must be removed to avoid disturbance due to the 32 KHz quartz.
SB13
PC15 is connected to the 32 KHz crystal when SB13 is open (default setting).
PC15 is connected to the extension connector CN6 when SB13 is closed. In such
a case, R197 must be removed to avoid disturbance due to the 32 KHz quartz.

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2.4 Reset source
The reset signal of the STM32303C-EVAL evaluation board is low active and the reset
sources include:
●Reset button (B1)
●Debugging tools from JTAG/SWD connector (CN10) and ETM trace connector (CN9)
●Daughter board from CN7
●Embedded ST-LINK/V2
●RS232 connector (CN8) for ISP
Note: The JP10 jumper must be closed for RESET handled by pin8 of RS232 connector, CN8
(CTS signal).
2.5 Boot option
The STM32303C-EVAL evaluation board can boot from:
●the embedded user Flash
●the system memory with boot loader for ISP
●the embedded SRAM for debugging
The boot option is configured by setting switch SW1 (BOOT0) and bit 12 of USER OPTION
BYTES (BOOT1) in Small Information block (SIF). BOOT0 can also be configured via the
RS232 connector, CN8.
Table 7. 8 MHz crystal X2 related solder bridges
Solder bridge Description
SB14
PF0 is connected to the 8 MHz crystal when SB14 is open (default setting).
PF0 is connected to the extension connector CN7 when SB14 is closed. In such a
case, C51 and X2 must be removed to avoid disturbance due to the 8 MHz quartz.
SB15
PF1 is connected to the 8 MHz crystal when SB15 is open (default setting).
PF1 is connected to the extension connector CN7 when SB15 is closed. In such a
case, R205 must be removed.
Table 8. Boot-related switch
Switch
configuration
bit 12 of USER OPTION
BYTES STM32303C-EVAL boot
0 <----> 1 XFrom the user Flash when SW1 is set as
shown to the left (default setting)
0 <----> 1 0
From the embedded SRAM when SW1 and
bit12 in USER OPTION BYTES are set as
shown to the left.
0 <----> 1 1
From the system memory when SW1 and
bit12 in USER OPTION BYTES are set as
shown to the left.
SW1
SW1
SW1

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2.6 Audio
The STM32303C-EVAL evaluation board supports stereo audio play and microphone
recording by an external headset connected on audio jack CN11. An audio DAC CS42L52 is
connected to the I2S port of the STM32F303VCT6 microcontroller. The microphone on
headset or microphone which is reserved on board (U26, default unmounted) are connected
to ADC of CS42L52. The CS42L52 can be configured via I2C2 and be driven by either
I2S_MCK at PA9 or the external I2S clock mode supported by an external PLL (U12).
Note: Please keep VDD to 3.3 V (Power mode 1 in Section 2.2) when using external PLL CS2200.
The I2C communication depends on JP5 and JP6 jumper setting.
The I2C address of CS42L52 is 0b1001010, and that of External PLL CS2200 is
0b1001110.
Table 9. Boot0-related jumper
Jumper Description
JP9
Bootloader_BOOT0 is managed by pin 6 of connector CN8 (RS232 DSR
signal) when JP9 is closed. This configuration is only used for the boot
loader application.
Default Setting: Not fitted
Table 10. Audio-related jumpers
Jumper Description Setting
JP5
PA10 is used as I2C standard mode and it is connected to
I2C2_SDA signal on Audio DAC, Audio external PLL,
temperature sensor and RF EEPROM connector when JP5 is
set as shown to the right (default setting):
PA10 is used as I2C fast mode and it is connected to
I2C2_SDA_F signal on EEPROM when JP5 is set as shown to
the right:
JP6
PF6 is used as I2C standard mode and it is connected to
I2C2_SCL signal on Audio DAC, Audio external PLL,
temperature sensor and RF EEPROM connector when JP6 is
set as shown to the right (default setting):
PF6 is used as I2C fast mode and it is connected to
I2C2_SCL_F signal on EEPROM when JP6 is set as shown to
the right:
JP18
PA9 is connected to I2S_MCK signal on CS42L52 when JP18
is set as shown to the right (default setting)
PA9 is connected to IR_IN signal on TSOP34836 when JP18
is set as shown to the right:

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2.7 USB
The STM32303C-EVAL evaluation board supports USB2.0 compliant full speed
communication via a USB type B connector (CN12). The evaluation board can be powered
by this USB connection at 5 V DC with 500 mA current.
A USB disconnection simulation can be implemented by controlling the 1.5 K pull-up resistor
on the USB+ line and by detecting the 5 V power on the USB connector (CN12) via a
resistor connected to PB8.
USB will work properly when VDD > 3 V.
2.8 RS232, RS-485 and IrDA
The RS232, RS-485 and IrDA communication is supported by D-type 9-pin RS232/RS-485
connectors (CN8) and IrDA transceiver (U10) which is connected to USART1 of
STM32F303VCT6 on the STM32303C-EVAL evaluation board. Bootloader_RESET &
Bootloader_BOOT0 signals are added on the RS232 connector (CN8) for ISP support.
The RS485 communication is supported by the RS485 transceiver, ST3485EBDR, which is
connected to pin4 and pin9 of D-type 9-pin connectors CN8 (share the same connector with
USART1).
Table 11. RS232, RS485 and IrDA related jumpers
Jumper Description Setting
RS232_RX RS485_RX
IRDA_RX
JP13
RS232_RX is connected to the RS232 transceiver
and the RS232 communication is enabled when JP13
is set as shown to the right (default setting):
RS485_RX is connected to the RS485 transceiver
and the RS485 communication is enabled when JP13
is set as shown to the right:
IrDA_RX is connected to the IrDA transceiver and the
IrDA communication is enabled when JP13 is set as
shown to the right:

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2.9 Touch-sensing buttons
The STM32303C-EVAL evaluation board supports two touch-sensing buttons based on the
charge transfer technology.
Table 12. RS485 related solder bridges
Jumper Description
SB17, SB18
The external failsafe biasing is enabled when solder bridges SB17 and
SB18 are closed.
Default setting: Not fitted
SB16 The bus termination is enabled when solder bridge SB16 is closed.
Default setting: Not fitted.
Table 13. Touch-sensing button related solder bridges
Solder bridge Description
SB6
PD13 is connected to the touch button when SB6 is open.
(Default setting)
PD13 is connected to the extension connector CN7 when SB6 is closed. In
such a case, R104 must be removed to avoid disturbance due to the touch
button.
SB7
PD15 is connected to the touch button when SB7 is open.
(Default setting)
PD15 is connected to the extension connector CN7 when SB7 is closed. In
such a case, R102 must be removed to avoid disturbance due to the touch
button.
SB8
PD12 is connected to the sampling capacitor when SB8 is open.
(Default setting)
PD12 is connected to the extension connector CN7 when SB8 is closed. In
such a case, C52 must be removed to avoid disturbance due to the
capacitor.
SB9
PB12 is connected to the shield when SB9 is open.
(Default setting)
PB12 is connected to the extension connector CN6 when SB9 is closed. In
such a case, R103 must be removed to avoid disturbance due to the
shield.
SB11
PB11 is connected to the shield charge capacitor when SB11 is open.
(Default setting)
PB11 is connected to the extension connector CN6 when SB11 is closed.
In such a case, R137 must be removed to avoid disturbance due to the
capacitor.

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2.10 MicroSD card
The 2 GB (or more) MicroSD card connected to the SPI2 port (Shared with color LCD and
Serial EEPROM) of STM32F303VCT6 is available on the board. The MicroSD card
detection is managed by the standard I/O port, PC6.
2.11 Serial EEPROM
A 1 Mbit (M95M01-R) serial EEPROM connected to the SPI2 port (shared with color LCD
and MicroSD card) of STM32F303VCT6, serial Flash Chip select is managed by I/O pin
PD7.
2.12 RF EEPROM
The RF EEPROM daughter board, ANT7-M24LR-A, is mounted on CN1 to
STM32F303VCT6 via the I2C2 bus.
The I2C address of RF EEPROM is 0b1010000.
The I2C communication depends on JP5 and JP6 jumper setting, as shown in Table 10.
2.13 EEPROM
To fit the fast mode requirements, a 1 Mbit EEPROM, M24M01-HR, is directly connected to
the I2C2 bus of STM32F303VCT6 by setting JP5 and JP6 jumpers, as shown in Table 10.
Table 14. EEPROM Related Jumpers
Jumper Description
JP8 The EEPROM is in Write protection mode when JP8 is closed.
Default setting: Not fitted
JP5,JP6 Refer to Table 10

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2.14 CAN
The STM32303C-EVAL evaluation board supports one channel of a CAN2.0A/B compliant
bus communication based on the 3.3V CAN transceiver. The high-speed mode, standby
mode and slope control mode are available and can be selected by setting JP4.
CAN will work properly when VDD > 3 V.
2.15 IR LED and IR receiver
The IR receiver, TSOP34836, is connected to PA9 of STM32F303VCT6 and the IR LED is
driven by PB9 through transistors T4 and T5 on the board. The IR receiver depends on
JP18 jumper setting, as shown in Table 10.
Note: The IR LED may be driven by PB9 directly when SB19 is closed and R281 is removed.
2.16 High brightness LED
An amber high brightness LED and its power control circuits are on the STM32303C-EVAL
board. The brightness can be adjusted by the PWM signal from STM32F303VCT6 through
PE13. The current on the LED can be monitored by the STM32F303 thanks to the voltage
measured on PD14, which corresponds to current through R261 (10 ohm).
2.17 Humidity sensor
A humidity sensor, HS1101LF, is on the STM32303C-EVAL board. The charge control signal
is connected to the timer in STM32F303VCT6 through PC8, and the measured result of
HS1101LF is connected with PB0.
Note: Please keep VDDA =V DDIO during the measurement.
A 180 pF 1% capacitor, C121, is used to calibrate the humidity sensor by setting JP19.
Table 15. CAN related jumpers
Jumper Description Setting
JP4
The CAN transceiver is working in standby mode when JP4
is set as shown to the right:
The CAN transceiver is working in high-speed mode when
JP4 is set as shown to the right: (default setting)
The CAN transceiver is working in slope control mode
when JP4 is open.
JP3 The CAN terminal resistor is enabled when JP3 is fitted.
Default setting: Not fitted

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2.18 Comparator
VDD_ANA is divided by the resistor bridge of LDR VT9ON1 & 8.2K resistor and connected
to PA0 (COM7_IN+/COM1_IN-/ADC IN1). VDD_ANA is also divided by the RV2
potentiometer and connected to PC1 (COM7_IN+/ADC12).
Figure 4. STM32303C-EVAL comparator features
2.19 Temperature sensor
A temperature sensor, STTS751, is connected to the I2C2 bus of STM32F303VCT6 by
setting JP5 and JP6 jumpers, as shown in Tabl e 10.
Table 16. Humidity sensor related jumper
Jumper Description Setting
JP19
A 180 pF 1% capacitor is connected for calibration when
JP19 is set, as shown to the right:
A humidity sensor is connected to measure the humidity
when JP19 is set, as shown to the right: (default setting)
MS30712V1
LDR
0
VDD_ANA
GND
0
VDD_ANA
GND
+
-
-
+
GPCOMP1_IN-
GPCOMP1_IN+
GPCOMP7_IN+
GPCOMP7_IN-
OUT
OUT
ADC1
ADC12
PA0
PC1
GPCOMP1
GPCOMP7
Table 17. Temperature sensor related jumpers
Jumper Description
JP1
An SMB signal connects to the temperature sensor event signal when JP1
is closed.
Default setting: Not fitted