Part Number:BQ34110
My customer is observing a delay for receiving ACK over I2C after an address and/or command is sent to BQ34110.
Most of the times the ACK comes after 300 us, which is not a problem, but occasionally ACK takes up to 24 milliseconds.
Also within an hour the customer observed about 10 ACK delays of 1.2 milliseconds.
1. The VCC/Vbat/CE voltages look good no noise and sags in the voltages were noticed when the delayed ACK occurs.
2. The BQ34110 is used to monitor a Lead Acid battery. Delayed ACKs happen only when charging the battery (Constant Current mode or Constant voltage). We never observed delayed ACKs during the trickle charge or when we are not charging the battery.
3. Tried to reduce the charging current to be 2.5 times lower (800mA), but still noticed delayed ACKs.
4. From all I2C logs the very first delayed ACK happens 5-6 minutes after the charging has been initiated.
I am ordering an EVM for trying to reproduce the issue on my end, but in the meantime I wonder if anyone has seen this issue before and has some ideas to share.
Is this kind of delay normal for the BQ34110?
Thank you!