OLIMEX© 2015
STM32-P405 user's manual
6.3 CAN connector
The available CAN interface is compliant with the 2.0A and B (active) specifications with a bitrate up to
1 Mbit/s. The on-board CAN interface uses CAN bus transceiver SN65HVD230. The transceiver itself is
connected to the main microcontroller's pins 61 (port PB8) and 62 (port PB9).
CAN connector
Pin #
Signal name
1
GND
2
CANL
3
CANH
The CAN interface behavior can be influenced by the two jumpers CAN0_T and CNTRL/HS.
6.4 UEXT connector
STM32-P405 board has UEXT connector and can interface Olimex's UEXT modules. UEXT is a board to
board connector which supports three serial communication interfaces – I2C, SPI and RS232. There is
also a +3.3V output line and GND.
For more information on UEXT please visit:
https://www.olimex.com/Products/Modules/UEXT/
UEXT connector
Pin #
Signal name
MCU pin #
1
3.3V
-
2
GND
-
3
USART1_TX
42
4
USART1_RX
43
5
I2C1_SCL
58
6
I2C1_SDA
59
7
SPI1_MISO
22
8
SPI1_MOSI
23
9
SPI1_SCK
21
10
SPI1_NSS
20
Note that the I2C lines have 10k pullup resistors. SPI1_NSS also has a 10k pullup.
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