system power off

RE: system power off

Jason — Fri, 21 Nov 2014 00:31:51 GMT

but, why did you use the sense pin with "NOPULL" in the all examples ? and so I need an external pull resistor when I use the "NOPULL", right?

RE: system power off

wlgrd — Thu, 20 Nov 2014 19:25:18 GMT

The problem you meet with NOPULL is, and I quote: "If there is no pull on the pin then it is floating. When the state of the GPIO pin is in between VDD0.3 and VDD0.7 then the state is undefined. This might cause the chip to occasionally or frequently wake up, therefore causing the high current consumption."

RE: system power off

Stefan Birnir Sverrisson — Thu, 20 Nov 2014 14:59:12 GMT

If you configure a GPIO pin as input you should always specify either high or low pull if this is not done for the circuit that connects to the gpio pin. If there is no pull on the pin then it is floating. When the state of the GPIO pin is in between VDD0.3 and VDD0.7 then the state is undefined. This might cause the chip to occasionally or frequently wake up, therefore causing the high current consumption.

RE: system power off

Jason — Wed, 19 Nov 2014 12:16:36 GMT

Hi,

I got it.

The sense pin with "NOPULL" is the problem cause of current too high in the "power off" mode. When I set the sense pin with the "PULLUP", the problem will be resolved.

What problem I meet with "NOPULL" ?