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UnderVoltage shutdown fail

Question asked by Edmond Hung on Aug 30, 2016
Latest reply on Sep 1, 2016 by igorpadykov

Hi Communities,

 

I have a custom board build on i.MX6D and PF0100F0A PMIC which powered by a 1-cell Li-po battery.

When the battery voltage is at ~3.1V open, the boot up sequence will make it drop to ~2V then stay at 2.7V.

From the datasheet, this should trigger the PMIC undervolt detect and put it into coincell mode.

But on our board, this fail to happen. The board just shutdown and bootup again and again until the battery protect circuit completely cut the power.

 

I have tried to pull the PWRON pin to 3V by external power supply, supply the VSNVS by external supply but nothing change.

 

I just want the undervoltage detection works, shut the system down and stay power off until the battery is about 3.1V which is datasheet stated rising threshold of UVDET and someone press the power button again.

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