GPIO Sense Power Consumption?

RE: GPIO Sense Power Consumption?

Ole Bauck — Wed, 22 Jun 2016 11:54:07 GMT

If the problem is not in the PAN it is fixed. I have not heard about any problems when entering sleep on CEAA Ex0. Can you check that the reset reason is wake up from GPIO? You can do this by checking NRF_POWER->RESETREAS. Remember that this register is only cleared after a power on reset or a brown out reset, or if you clear it manually. Therefore you should clear it after reading it.

You may also monitor the gpio sense pin (or the reset pin in case this wakes up the chip) to see if there are any noise triggering the wake up.

RE: GPIO Sense Power Consumption?

Ryan — Mon, 20 Jun 2016 19:17:32 GMT

It now looks like I am sometimes able to get into low-power sleep and other times I cannot. Are there any problems with entering sleep on CEAA Ex0? I looked at nRF51822-PAN_v3.1.pdf and saw nothing useful, though I noticed on the Revision 2 chips there was a problem with the GPIO Sense. This was resolved?

RE: GPIO Sense Power Consumption?

Ole Bauck — Fri, 17 Jun 2016 14:33:36 GMT

1mA on 12V sounds like around 3.5mA on 3.3V which is close to the CPU run current. It is hard for me to know what may be the cause for this since I don't have the code, but I would guess you are waking up from sleep immidiately when you try to go to system OFF. Another possible soultion is that you run into an error condition and the system does a soft reset. Do you know why the reset reason had soft reset? Do you do any soft reset (NVIC_SystemReset()) in your code?

RE: GPIO Sense Power Consumption?

Ryan — Fri, 17 Jun 2016 14:08:55 GMT

Also, I am currently using S110 v8.0 and SDK v8.1.0. If this is fixed in a newer version, I will migrate, but I am holding off for now since that will require some time to complete.

RE: GPIO Sense Power Consumption?

Ryan — Fri, 17 Jun 2016 12:08:41 GMT

Yes, there are multiple voltage rails and switching regulators on this board. It is easiest to measure 12V current since this is the input and it is what matters to me in terms of system power consumption. I am seeing about 1 mA consumption at 12V, so the 3.3V rail is several times this.

RE: GPIO Sense Power Consumption?

Ole Bauck — Fri, 17 Jun 2016 10:18:31 GMT

I sincerely hope that there is a <3.6V regulator between 12V and the nRF? The maximum voltage rating is 3.6V.

So you are experiencing about 1mA current consumption? You are trying to go to System OFF? If the sense level is correct when you go to system OFF, you will wake up immediately.