LP87702-Q1: STANDBY to ACTIVE

Hi Zehui,

could you please let me know the full OPN (orderable part number) for this device? Then I could take a look how your device is configured.

regards,

Niko 

Hi Niko,

LP87702PRHBRQ1

Hi Zehui,

thank you for the information. Per Table 7-5 in the data sheet you need to write 1 to RESET_REG_INT registers to clear the interrupt and allow restart.

regards,

Niko

Hi Niko,

     There is a problem that is the processor is powered by the device. When the device output is disable there is no one can control the i2c bus.

hi niko,

There is no way to control the register. Any other way?

Hi Zehui,

how is the enable signal given to PMIC and does it toggle when this sequence happens?

regards,

Niko

Hi Niko,

    In my board enable pin is pulled up to VANA. It will drop as VANA. But considering the input high level threshold，I think it's always high.

Hi Zehui,

please try to toggle the NRSTOUT and then toggle the enable signal.

regards,

Niko 

Hi Niko,

t's a good idea! However in my board enable pin is connected to VANA. It will be really complicated to design a toggle generator circuit. I don't really want to add a extra MCU for power monitor either.

Let's think outside the box. Can we avoid the device into the situation? Is there a way to disable the function?

Hi Zehui,

would there be a way to just test this using external voltage to see if it would work? The undervoltage lockout can't be disabled.

regards,

Niko