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Interfacing PCA9548A with CC3200

Question asked by Harish Jayanth on Apr 6, 2017
Latest reply on Apr 13, 2017 by David Diaz Marin

I am using Energia IDE to program my RBL CC3200 wifi micro. I am trying to interface multiple IMUs through a PCA9548APW. My circuit looks something the one below. There seems to a communication issue between the CC3200 and the MUX.

The exact same circuit works well with an Arduino Uno R3 but not with the CC3200. I have tried using a variety of Pull up Resistors from 1k to 10k.

On connecting the SDA and SCL to an oscilloscope, I came to notice that there is a constant digital signal on the SDA line and no signal on the SCL pin. 

When I plugged in an MPU6050 directly to the CC3200, without the MUX in between, there is no problem.

I am pretty clueless on where I am going wrong. What could be the issue and how can I get it working?