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Bot-Logic expansion optionsEach of three expansion board options has two 6-pin connectors. These are open expansion slots, so you can choose boards from any source. Pin configuration is:

1: IOREF 2: POS5V 3: VCC(3.3Vdc)
4: Option A-B-C                 5: Option A-B-C 6: GND
7: GND 8: SPI_MOSI 9: SPI_MISO
10: SPI_CLK 11: SPI_SELECT             12: IOREF

 

 

 

 

 

CARE SHOULD BE TAKEN TO MATCH PIN 1 ON THE BOARD AND THE CONNECTORS WHEN CONNECTING A NEW XP BOARD.

Each expansion connector has six solder jumpers in pairs labelled A, B and C. By shorting two jumpers and opening the rest, users can choose from the following options:

    • C: Default I2C Buss using 3.3V levels with a 10K pull-up resistor on both lines to 3.3V.
    • B: I2C Buss using 5.5 Volt levels with a 10K pull-up resistor on both lines to 5.5V.
    • A: RXn,TXn where n is the same number as the XP option connectors. (On the UNO and LEO versions of the board RX0,TX0 goes only to XP2. XP1 and XP3 can be used for I2C dunctions only.)

I2C on each XP connector can be selected at 3.3V or 5.5V and the three XP option boards do not need to use the same levels. The translation of these signals will be done on the BOT-LOGIC board and passed to the Arduino. The level translation is compatible with the full I2C bandwidth. 

Pins 4 and 5 can have different functions.

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