Datasheet

In addition to the three standard power pins, the ItsyBitsy nRF52840 Express has a few more pins available for power

sourcing:

3V - this is the regulated output from the onboard regulator. You can draw 500mA whether powered by USB or

battery.

EN - connected to the regulator enable, it will let you shut off power -

when running on battery only

. But at least

you don't have to cut a trace or wire to your battery. This pin does not affect power when using USB

Vhi - this is a special pin! It is a dual-Schottky-diode connected output from BAT and USB. This means this will

always have the higher-of-the-two voltages, but will always have power output. The voltage will be

about

5VDC

when powered by USB, but can range from 3.5-6VDC when powered from battery. It's not regulated, but it is

high-current, great for driving servos and NeoPixels.

Analog Inputs

The 7 available analog inputs (A0 .. A5 and D10 which is called A6) 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

an internal 0.6V reference

The following default values are used:

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

Default resolution: 12-bit (0..4096)

Default mV per lsb (assuming 3.6V and 12-bit resolution): 1 LSB = 0.87890625 mV

Since the AREF can be scaled internally, we don't have an external AREF pin - it's not needed!

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

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

specified pins, A0 thru A5 and also D10/A6

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