https://devzone.nordicsemi.com/f/nordic-q-a/21732/nrf52840-input-circuit-questionDear Engineers! have a questions about the Input circuit of nRF52. I have to monitor the signal LEVEL from some sensor. The signal can be Positive or Negative current, so , the input of nRF52 should be internally pulled to (+) or (-) use int. resistorsen-USTelligent Community 13Wed, 03 May 2017 14:20:49 GMThttps://devzone.nordicsemi.com/thread/85365?ContentTypeID=1Wed, 03 May 2017 14:20:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ea5f1e95-33a0-487d-ba65-94cd2ea61e11bjorn-spockeli<p>Hi Oleg,</p> <p>Q1: I do not think it is possible to enable the pull-up/down resistor when using aGPIO pin as an analog pin.</p> <p>Q2: Yes, I do not think that should be an issue, see section 36.1 Shared Resources in the nRF52840 OPS</p> <blockquote> <p>The ADC can coexist with COMP, LPCOMP and other peripherals using one of AIN0-AIN7, provided theseare assigned to different pins.</p> </blockquote> <p>Q3: The ISOURCE programmable current has been removed from the nRF52840 due to <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.Rev1.errata/anomaly_832_84.html?cp=2_2_1_0_1_22">Errata [84] COMP: ISOURCE not functional</a> on the nRF52832.</p><div style="clear:both;"></div>