I hooked up the TCA8418 scanner EVM board ( http://focus.ti.com/lit/ug/scpu033/scpu033.pdf ) to our main board via I2C and powered it via USB, the two white LEDs on the board come on. I am unable to read or write to the device over I2C. The device is not getting registered on the i2c bus at address ( 0x68) as specified by datasheet. The I2C lines from the main processor are connected to TP3 and TP4 o the EVM.
From the EVM user's guide it seems that TP3 and TP4 are there to connect other I2C slave devices. Is it possible to connect the I2C lines from the master I2C device to TP3 & TP4 and control the EVM board?
My goal is to use the EVM board as a test bed to develop a Linux driver for the TCA8418 based keyboard scanner.
