Datasheet

3-5V / Vin - this is the power pin, connect to 3-5VDC - it has reverse polarity protection but try to wire it right!

3.3V out - this is the 3.3V output from the onboard regulator, you can 'borrow' about 100mA if you need to power

some other 3.3V logic devices

GND - this is the power and signal ground pin

ENAble - This pin is all the way on the right. It is connected to the enable pin on the onboard regulator that

powers everything. If you want to

really

have the lowest possible power draw, pull this pin low! Note that if you

do so you will cut power to the eInk display but also the SPI RAM (thus erasing it) and the SD card (which means

you'll have to re-initialize it when you re-power

Data Control Pins

SCK - this is the SPI clock input pin, required for e-Ink, SRAM and SD card

MISO - this is the SPI Master In Slave Out pin, its used for the SD card and SRAM. It isn't used for the e-Ink

display which is write-only, however you'll likely be using the SRAM to buffer the display so connect this one too!

MOSI - this is the SPI Master Out Slave In pin, it is used to send data from the microcontroller to the SD card,

SRAM and e-Ink display

ECS - this is the E-Ink Chip Select, required for controlling the display

D/C - this is the e-Ink Data/Command pin, required for controlling the display

SRCS - this is the SRAM Chip Select, required for communicating with the onboard RAM chip.

SDCS - this is the SD card Chip Select, required for communicating with the onboard SD card holder. You can

leave this disconnected if you aren't going to access SD cards

RST - this is the E-Ink ReSeT pin, you may be able to share this with your microcontroller reset pin but if you can,

connect it to a digital pin.

BUSY - this is the e-Ink busy detect pin, and is optional if you don't want to connect the pin (in which case the

code will just wait an approximate number of seconds)

FeatherWing Connections