Feather M0 Express Designed For Circuit Python Circuitpython

AdafruitATSAMD21G18

A Feather board designed for CircuitPython with an ATSAMD21G18 ARM Cortex M0+ processor, 48 MHz clock speed, and 256KB flash memory.

In stock

Specifications

Operating Voltage: 3.3V logic level, 4.2/3.7V LiPoly battery input range (via JST jack) and 5V USB input range (via micro USB jack)
Logic Level: 3.3V
Clock Speed: 48 MHz
Flash: 256KB bytes
Ram: 32KB bytes
Gpio Count: 20
Dimensions: 2.0" x 0.9" x 0.28" inches
Connectivity: USB, I2C, SPI, UART

Pin	Name	Functions	Notes
GND	GND	POWER	Common ground for all power and logic
BAT	BAT	POWER	Positive voltage to/from the JST jack for optional LiPoly battery
USB	USB	POWER	Positive voltage to/from the micro USB jack if connected
EN	EN	POWER	3.3V regulator's enable pin, pulled up and connect to ground to disable 3.3V regulator
3V	3V	POWER	Output from the 3.3V regulator, can supply 500mA peak current
0 / RX	D0 / RX	GPIOUART	Receive (input) pin for Serial1, also analog input A8
1 / TX	D1 / TX	GPIOUART	Transmit (output) pin for Serial1, also analog input A9
SDA	SDA	I2C	I2C data pin, no pull-up by default
SCL	SCL	I2C	I2C clock pin, no pull-up by default
5	D5	GPIO
6	D6	GPIO
9	D9 / A7	GPIOADC	Analog input A7, connected to a voltage divider for the LiPoly battery
10	D10	GPIO
11	D11	GPIO
12	D12	GPIO
13	D13 / LED	GPIO	Connected to the red LED next to the USB jack
A0	A0	ADCPWM	Analog output due to having a DAC, can set raw voltage from 0 to 3.3V
A1	A1	GPIOADC
A2	A2	GPIOADC
A3	A3	GPIOADC
A4	A4	GPIOADC
A5	A5	GPIOADC
SCK	D18 / SCK	SPI	Hardware SPI clock pin
MOSI	D23 / MOSI	SPI	Hardware SPI MOSI pin
MISO	D19 / MISO	SPI	Hardware SPI MISO pin
CS	D38 / CS	SPI	Chip select for the SPI Flash

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ATSAMD21G18

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