PymateIO-Expansion-Connector

Abstract

The Pymate Expansion connector is used to connect Pymate expansion board to Pymate Core.

Most of the expansion (like 16ADI16DO) relies on the CAN bus.

Some other expansion (like Ethernet) relies on SPI bus. Some extra pin may also be reconfigured to support the target expansion.

Do not sacrifice the I2C bus to convert the I2C4_SDA and I2C4_SCL lines into GPIOs!

Indeed, I2C can be used to add a GPIO expander (mcp23017, mcp23008, pcf9536, tca9554a) controlling additional GPIOs.

The GPIO expander can be used for additional input/output, new nss lines for the SPI bus, digital switch activation for UART and much more!


Pin	Name	Type	Volt. range	Description
1	/SRST		3V3	Placed LOW when reset is activated.
2	GND	Power		Common Ground
3	I2C4_SCL	I2C	3V3	I2C Bus clock signal
4	I2C4_SDA	I2C	3V3	I2C Bus data signal
5	I2C4_SMB	GPIO	3V3	Can be used as GPIO, Interrupt Pin, OneWire, second SPI bss. Usage depends on connected expansion.
6	SPI1_MOSI	SPI	3V3	SPI Master Out data line
7	SPI1_MISO	SPI	3V3	SPI Master In data line
8	SPI1_SCK	SPI	3V3	SPI Clock line
9	SPI1_NSS	GPIO	3V3	GPIO also used as SPI Slave Select line
10	TX	UART	3V3
11	RX	UART	3V3
12	CANL	CAN	5V	Same line as CANL connector. CAN is the main interface bus for Pymate expansion.
13	CANH	CAN	5V	Same line as CANH connector.
14	GND	Power		Common Ground
15	5V	Power	5V	Power source (1A max)