TCA9555: TCA9555PWR I2C control issue

Eddie Chou

Expert 5670 points

Part Number: TCA9555

Hi Team,

My customer would control TCA9555PWR with I2C command below,

I2C address is 0x20 [A2:A0] connect to "low"

Customer send I2C data 0xFF to Port 0 and Port 1, but the output port is still stay at "low"

Would you help check if any mistake with I2C command ?

Thanks & Regards

Eddie

9 months ago

0 Clemens Ladisch 9 months ago

Guru 287860 points

How are the other registers initialized?

0 Tyler Townsend 9 months ago

TI__Mastermind 33903 points

Hi Eddie,

Clemens has a good question here. What are the other registers initialized to?

We are mainly referring to the values inside the polarity inversion register, and the configuration registers.

Note that to see outputs on the GPIO side, one must first change the contents of the configuration registers 0x06 and 0x07 to set the GPIOs from INPUT to OUTPUT. Then, once the Pxx pin is configured to OUTPUT, the value that it reflects will be the contents of the output port registers located at address 0x02 and 0x03.

Please let me know if this makes sense.

Regards,

Tyler

0 Eddie Chou 9 months ago in reply to Tyler Townsend

TI__Expert 5670 points

Hi Tyler, Clemens ,

Thanks, we are checking with customer other register setting.

Will let team know once we get register setting from customer.

Thanks & Regards

Eddie

0 Eddie Chou 9 months ago in reply to Eddie Chou

TI__Expert 5670 points

Customer can get output after modified Reg6 and Reg7, thanks

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TCA9555: TCA9555PWR I2C control issue