TCA9548A: TCA9548A Module I/O Error

Please show the schematic of the module and of the I²C bus part of the AGX.

I am using i2c bus port 1

The Ax and RST pins of the TCA9548A must not float.

Are there pull-up resistors on the I²C lines?

every thing is there in module RST Pin also floating through pullup

and SCL and SDA have Pullups

This module i am using and this module interfacing with AGX

Hi Sandiri,

This appears to be a TCA9548A-MOD board from adafruit. This board has a pull-up resistor on the nRESET line, so I don't expect this is the problem here. 

In order for the an I2C controller to access a device on channel 0 of TCA9548A, the channel will first have to be enabled on the switch. To do this, the controller will need to write to the switch using the proper device address which can be found in Table 1 of the device's datasheet. The data written to this device will need to have the least significant bit (bit 0) set to 1 in order to enable channel 0. If no other channels are used, the data field can be 0x01. 

Once this write is complete, channel 0 will be enabled and the I2C controller can communicate with any responder device connected to SC0/SD0. Make sure this is complete before running a discovery for any responder on this down-stream channel. 

If you are still having trouble after this, please share a block diagram of how the TCA9548A is connected to the I2C controller and all peripherals. This will help us understand the desired setup and functionality of the test you're conducting. 

Regards,
Eric Schott