This project uses PMIC TPS6594-Q1, which uses the watchdog inside. The QA mode and window parameters are set to a maximum value of about 70ms. It was found that the system did not restart after feeding the dog for 50ms. According to the manual, the calculation window should be 66.88ms~73.92ms. Why does it not restart even after feeding the dog for 50ms?
Hello,
It was found that the system did not restart after feeding the dog for 50ms.
Was an answer given every 50ms? The PMIC is expecting 4 "answers" from the MCU, 3 during WINDOW1 and 1 during WINDOW2. If the last answer comes too early this will cause a fault/error.
Based on the above figure from the data sheet and your settings. Answer 3, 2, and 1 must be received in first 70ms (Window-1) and Answer 0 would have to wait until Window-2.
I suspect that you are sending WD answers too early. Is it possible to query the PMIC with another I2C device after the rails shut down? If so, please read WD_ERR_STATUS register.
Thank you.
I have a question about watchdog window time,
as I defined :
figure 2:
