In IMX7D processor, we are using push button on “ONOFF” pin to control the PF3000 PMIC rails. To implement this functionality,
we have connected SNVS_PMIC_ON_REQ(Active high) to PMIC “PWRON” pin. We are facing following issue in our bring up.
- When first time power up the board, all the rails in PMIC are coming up before pressing the ONOFF button.
- After power up if we press the push button for >5Sec, all the rails are going OFF as expected, if we press the push button again for short period all the rails are coming up as expected.
Only problem is when first time power up. The expected result when first time power up is, all the rails should be OFF till we press the push button. Please check and let us know how to solve this issue.
FYI we have no external component on ONOFF pin.
Note: We have implemented this logic as per reference design (Sabre Board)