• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 1237 views
  • Users 0 members are here
Support feedback
Options
Options

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TCA6424A: TCA6424A doesn't answer on I2C

TCA6424A: I2C command to set the GPIO

Gurudath Amritapura1
Prodigy 110 points
Part Number: TCA6424A

Hello,

I am using TDA4 EVM. In the CP part of the EVM, a TCA6424A GPIO expander is used to control 2 USER LEDs (P26 & P27). Below screenshot is from the Schematics of the CP. As per the given infomration:

  • I2C BUS - 0
  • Address - 0x21

If the i2cset/i2cget has to be used to control these LEDs, the below commands are formed:

i2cset -f -y 0 0x21 <Command> <Data>

i2cget -f -y 0 0x21 <Command> 

But from the datasheet of TCA6424A, it specifies Slave address as a field in the Write or Read sequence as shown below:

Where to include this Slave address in the i2cset/i2cget commands? Could you please give a sample command to control one GPIO pin using TCA6424A?

Thanks & Regards,

Gurudath