6 - Reference design

AN2156

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6.7

CAN interface

A general purpose, asynchronous serial I/O data port connected through a 9-pin D-type male

connector with micro switches selectable between High or Low bus output S702, and between

Standby or Slope control S50.

For more details, refer to the CAN transceiver L9616 datasheet.

6.8

RS232 serial interface

A general purpose, asynchronous serial I/O data port connected through a 9-pin D-type male

connector.

RS232 connects directly to UART0, transmit and receive only (null modem).

RTS is shorted to CTS and DTR is shorted to DSR at the connector.

For more details, refer to the RS232 transceiver ST3232 datasheet.

6.9

Serial ROM

6.9.1

SPI EEPROM

8 Kbit SPI serial EEPROM connected to the buffered serial peripheral interface (BSPI). Switch

S41 is used to enable or disable write protect (pull down = Write protect, pull up = Write

enabled).

For more details, refer to the SPI EEPROM M95080 datasheet.

6.9.2

I2C EEPROM:

8 Kbit EEPROM connected to the I2C0 interface, Switch S40 is used to enable or disable write

protect (pull down = Write protect, pull up = Write enabled).

For more details, refer to the I2C EEPROM M24C08 datasheet.

The values R43 and R45 depend essentially on the I2C communication speed.

For more details on theses values, please refer to the STR73x Reference Manual.

6.10

JTAG interface

Refer to the Section 5: Debug management.