Datasheet

during the bootloader phase.

Power Pins

3.3V Output: This two pins are connected to the output of the on board 3.3V regulator. They can be used to

supply 3.3V power to external sensors, breakouts or Feather Wings.

LIPO Input (VBAT): This is the voltage supply off the optional LIPO cell that can be connected via the JST PH

connector. It is nominally ~3.5-4.2V.

VREG Enable: This pin can be set to GND to disable the 3.3V output from the on board voltage regulator. By

default it is set high via a pullup resistor.

USB Power (VBUS): This is the voltage supply off USB connector, nominally 4.5-5.2V.

Analog Inputs

The 8 available analog inputs can be configured to generate 8, 10 or 12-bit data (or 14-bits with over-sampling), at

speeds up to 200kHz (depending on the bit-width of the values generated), based on either an internal 0.6V reference

or the external supply.

The following default values are used:

Default voltage range: 0-3.6V (uses the internal 0.6V reference with 1/6 gain)

Default resolution: 10-bit (0..4095)

PWM Outputs

Any GPIO pin can be configured as a PWM output, using the dedicated PWM block.

Three PWM modules can provide up to 12 PWM channels with individual frequency control in groups of up to four

channels.

I2C Pins

I2C pins on the nRF52832 require external pullup resistors to function, which are not present on the Adafruit nRF52

Feather by default. You will need to supply external pullups to use these. All Adafruit I2C breakouts have appropriate

pullups on them already, so this normally won't be an issue for you.

Unlike digital functions, which can be remapped to any GPIO/digital pin, the ADC functionality is tied to

specified pins, labelled as A* in the image above (A0, A1, etc.).

Please note that DMA based PWM output is still a work in progress in the initial release of the nR52 BSP, and

further improvements are planned here.