Low voltage detector on "ble_app_blinky" peripheral

RE: Low voltage detector on "ble_app_blinky" peripheral

MartinBL — Thu, 21 Sep 2017 07:32:51 GMT

I don't have time to make an example for you, but there is an LPCOMP example in the SDKs that you can pretty much copy and paste into ble-app-blinky periheral example.

RE: Low voltage detector on "ble_app_blinky" peripheral

mc — Wed, 20 Sep 2017 16:48:35 GMT

thank you for the answer I think the power-fail comperator is ok. but we are new and no found the code to implement in "ble-app blinky periheral". thank you , wehen you can send us the full code and where we must implenet in "ble-app_blinky. peripheral. Best regards MC

RE: Low voltage detector on "ble_app_blinky" peripheral

MartinBL — Tue, 19 Sep 2017 08:56:51 GMT

Hi,

You have at least three options:

Use the ADC with the internal 1.2V reference voltage and Supply voltage with 1/3 prescaling as input. This is great since you don't need any external components. However, you will need to sample the input at regular intervals.
Use the Low power comparator (LPCOMP) to trigger an event when an external voltage crosses a given threshold. This is great because you don't need to sample the input, but you will need an external reference voltage and probably a voltage divider.
Use the Power-fail comparator (refer to the POWER chapter in the reference manual). No external components or software triggered sampling is required, but it doesn't work when the chip is in System OFF mode or when HFCLK is not running.