I received a BQ24161 Evaluation Module from TI today and hooked it up to my computer. TI recommends that I have the board strobe the watchdog timer every 5 seconds, and I set up the module for that. Upon connection of my battery and loading in the I2C register values for the features I want the battery charges as expected.However, occasionally the watchdog timer expires, and no amount of strobing that reset bit gets the watchdog timer to reset, which is exactly what I am seeing on our design. Only removing power to the EVM will cause it to reset (again, same as on our design).I would be curious to know if there are any known issues with resetting the watchdog timer, or if I am doing it incorrectly. I would imagine that the TI software for the EVB would do it correctly, however.
Please let me know, thank you.
There no know issues with the watchdog timer. As a reminder, once a read/write is performed on the I2C interface, a 30-second timer (tWATCHDOG) is started. The 30-second timer is reset by the host using the I2C interface. This is done by writing a “1” to the reset bit (TMR_RST) in the control register. The TMR_RST bit is automatically set to “0” when the 30-second timer is reset. This process continues until the battery is fully charged or the safety timer expires. Is it possible that the safety timer is expiring?
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