Can i interface 5V sesnors with nrf52840?

RE: Can i interface 5V sesnors with nrf52840?

Håkon Alseth — Mon, 27 Aug 2018 13:53:15 GMT

You should design the voltage divider in such a way that the voltage seen by the nRF GPIO is <= VDD_NRF + 0.3V, to ensure that you are within the specifications. The nRF52840 has an option to use REGOUT0, but this is up to 3.3V (and has two current erratas that currently limits its use-case: DCDC of REG0 not functional & Device does not start up in high voltage mode)

If you need more than 3.3V for your sensor, you should source it from the main battery/power source.

RE: Can i interface 5V sesnors with nrf52840?

arshdeep — Mon, 27 Aug 2018 13:45:32 GMT

Hello Alseth,

Thanks for your response. Yes, it is only input. As you said I can use the voltage divider to drop down the sensing voltage but is it safe and possible to provide 5V power to sensor using the nrF?

Thanks,

RE: Can i interface 5V sesnors with nrf52840?

Håkon Alseth — Mon, 27 Aug 2018 13:41:45 GMT

Hi,

Is this an input only, or is this a bi-directional signal? I am guessing only input, since you mention analog sensors.

If it is only a input signal to the nRF, you could use a voltage divider. If it is a bi-directional signal, then you might need a level shifter.

Cheers,

Håkon

RE: Can i interface 5V sesnors with nrf52840?

arshdeep — Mon, 27 Aug 2018 13:38:03 GMT

I can clearly understand that it is not possible in a direct way. I am trying to ask what would be the best way to do so or is it not safe for the micro-controller to interface such sensors at all?

RE: Can i interface 5V sesnors with nrf52840?

awneil — Sat, 25 Aug 2018 20:09:10 GMT

So the absolute maximum is 3.9V

Is 4.5V greater than 3.9V ... ?

RE: Can i interface 5V sesnors with nrf52840?

arshdeep — Sat, 25 Aug 2018 16:46:03 GMT

I was referring to this part. Does it mean I cannot interface sensors that output voltage within 0.5V-4.5V range?

RE: Can i interface 5V sesnors with nrf52840?

arshdeep — Sat, 25 Aug 2018 16:19:42 GMT

Thank you awneil for your great support.

Regards,

RE: Can i interface 5V sesnors with nrf52840?

awneil — Sat, 25 Aug 2018 11:48:18 GMT

Surely, the datasheet answers this question?

The datasheet tells you the permitted input range - doesn't it?