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AdafruitATSAMD21G18

A portable development board with an ATSAMD21G18 ARM Cortex M0+ microcontroller, Bluetooth Low Energy (BLE) module, and built-in USB charging.

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Specifications

Operating Voltage: 3.3V logic/power, 500mA peak current output from the 3.3V regulator, 4.2/3.7V LiPo battery input for optional charging via JST jack, USB power regulated to 3.3V for programming and operation.
Logic Level: 3.3V logic
Clock Speed: 48 MHz
Flash: 256KB KB
Ram: 32KB KB
Gpio Count: 20
Dimensions: 2.0" x 0.9" x 0.28" inches
Connectivity: USB, I2C, SPI, UART (Serial1), PWM
Usb: Micro USB jack for power and programming

Pin	Name	Functions	Notes
GND	GND	GND
BAT	BAT	—	Positive voltage to/from the JST jack for the optional LiPo battery
USB	USB	—	Positive voltage to/from the micro USB jack if connected
EN	EN	POWER	3.3V regulator's enable pin, pulled up to 3.3V
3V	3V	POWER	Output from the 3.3V regulator, can supply 500mA peak current
#0 / RX	GPIO #0	UART
#1 / TX	GPIO #1	UART
#20 / SDA	GPIO #20	I2C	No pull-up by default
#21 / SCL	GPIO #21	I2C	No pull-up by default
#5	GPIO #5	GPIO
#6	GPIO #6	GPIO
#9	GPIO #9	ADCPWM	Analog input A7, connected to a voltage divider for the LiPo battery
#10	GPIO #10	GPIO
#11	GPIO #11	GPIO
#12	GPIO #12	GPIO
#13	GPIO #13	PWM	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	GPIO A1	GPIO
A2	GPIO A2	GPIO
A3	GPIO A3	GPIO
A4	GPIO A4	GPIO
A5	GPIO A5	GPIO
SCK/MOSI/MISO (24/23/22)	SPI	SPI	Hardware SPI pins, can be used as GPIO but recommend keeping free for high speed and shared with BLE
#8	GPIO #8	PWM	Bluefruit CS (chip select) pin
#7	GPIO #7	PWM	Bluefruit IRQ (interrupt request) pin
#4	GPIO #4	PWM	Bluefruit Reset pin

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ATSAMD21G18

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