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UCD90160: Power sequencer and monitor device not getting detected on I2C bus and Fusion GUI

Bishwajeet Sah
Prodigy 40 points
Part Number: UCD90160
Other Parts Discussed in Thread: TPS536C7, TPS53681

Hi,

We have assembled UCD90160 device (Batch code: C5H0) in 5 boards. The device is not getting detected in any of the boards in Fusion GUI. 

We have tried the following to debug the issue but still it is not working:

a. Verified all the power & ground connections, pull-ups and pull-downs of the device on board. 

b. Un-mounted resistor connected on pin 60 (PMBUS ADDR1) to set I2C address to default 0x7E.

c. Replaced device in 2 boards with newer batch part (Batch code: AECI).

 As shown in the image below, the device is not sending I2C ACK when we are trying to access it.

Please suggest what can be done to debug this issue.

With Regards,

Bishwajeet