LPCOMP doesn't sense the pulse count correctly

RE: LPCOMP doesn't sense the pulse count correctly

Hung Bui — Wed, 02 Nov 2016 14:03:30 GMT

No, it's not possible.

RE: LPCOMP doesn't sense the pulse count correctly

Pavan kumar — Wed, 02 Nov 2016 12:31:24 GMT

ooh that's well, I wanna ask you one more question like is there any possibility to increase the sensitivity of lpcomp, I mean like by using external crystal or any other. Thanks

RE: LPCOMP doesn't sense the pulse count correctly

Hung Bui — Wed, 02 Nov 2016 11:30:48 GMT

@Pavan: You can think of using the nRF52, the LPCOMP only needs 5us to detect. And you have more option for VREF.

RE: LPCOMP doesn't sense the pulse count correctly

Pavan kumar — Wed, 02 Nov 2016 11:02:03 GMT

Thanks for your reply Hung

I'm using nrf51822 chip, the temperature sensor will give a pulse of frequency 88kHz ie, the pulse is 11.36us may be that causing the issue, is there any way to detect high frequency signals.

RE: LPCOMP doesn't sense the pulse count correctly

Hung Bui — Wed, 02 Nov 2016 08:19:36 GMT

Hi Pavan, Which chip are you testing with ?

How big is the pulse, if it's shorter than 15us, the LPCOMP won't detect the pulse. As you wrote the reference is 0.4125V , but the pulses are from 0.220V to 0.6V, are you planing to monitor only pulse higher than 0.4125V ?