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TCA7408 abnormal output

David Park
Expert 5440 points

Hi,

I got a question from customer like below.

Below is history of this question.

  1. GPIO2 D4 is connected to OSC_SEL which controls sub-board.
  2. Sub-board did not operates because OSC_SEL was low.
  3. After removing connection between GPIO2 D4 and OSC_SEL, they connected OSC_SEL to 3.3V directly. Sub-board operated normally.
  4. GPIO2 D4 was low and they suspected that TCA7408’s abnormal function was root cause.
  5. However, when they connected GPIO2 D4 to OSC_SEL again, it worked normally and GPIO2 D4 was high.
  6. Now they can’t duplicate this phenomenon.
  7. But they are worried about issues in field.

 

Have you ever get a similar issue from another customer?

Could you advice for debugging below issue?

Reset pin is connected to 3.3V with pull-up resistor and INT pin is floating.

I2C communication works well.

What do I have to do check more?

Thanks in advance.