Nrf52832 VIH and VIL

RE: Nrf52832 VIH and VIL

Håkon Alseth — Wed, 20 Jan 2021 09:07:26 GMT

Hi,

[quote user="Gaston"]So, in order to avoid readings in the undefined region, it's better to use the comparator with hystersis I guess?[/quote]

Yes, you are right.

Kind regards,

Håkon

RE: Nrf52832 VIH and VIL

Gueston — Mon, 18 Jan 2021 14:55:08 GMT

So, in order to avoid readings in the undefined region, it's better to use the comparator with hystersis I guess?

RE: Nrf52832 VIH and VIL

Gueston — Mon, 18 Jan 2021 14:48:55 GMT

Ah ok, like that. I understood it wrong, thought it was a schmitt trigger input, which doesn't read anything in the undefined region.

RE: Nrf52832 VIH and VIL

Håkon Alseth — Mon, 18 Jan 2021 14:42:21 GMT

It is consistent with the specification.

There's a guarantee that a voltage of VDD*0.7 (or higher) gives a '1' on the pin. Do you measure anything other than '1' on the input when VDD*0.7 or higher is applied?

Kind regards,

Håkon

RE: Nrf52832 VIH and VIL

Gueston — Mon, 18 Jan 2021 14:34:05 GMT

Yes I know it's the undefinied region, which is good. But 1.8V is 0.64*VDD and 1.1 is 0.39*VDD, which is not consistent with the spec. The specs says VDD*0.7 and ABOVE, but I measure from 0.64 and ABOVE for VIH.

RE: Nrf52832 VIH and VIL

Håkon Alseth — Mon, 18 Jan 2021 14:29:55 GMT

Hi,

[quote user=""]Which means a high input should be triggered from 1.96V and above, low should be 0.84V and below. However, I measure a high from 1.8V and a low from 1.1V, which is not conforming specs.[/quote]

Below VDD*0.7 and over VDD*0.3 is undefined, meaning that you can read both '0' and '1' in this range. Your measurements is consistent with the specification.

Kind regards,

Håkon