The SparkFun SAMD21 Dev Breakout has been equipped with a USB interface for programming and power, surrounded with an RTC crystal, and a 600mA 3.3V regulator. By utilizing the Pro R3’s extra PCB real-estate we’ve been able to leave room for a few extra GPIO pins and an integrated LiPo charger. To power the SAMD21 Breakout board, just plug it into a USB port on your computer via the micro-B port on the breakout. Not near a USB port? No problem, the SparkFun SAMD21 Dev Breakout is also equipped with a LiPo Battery connector (for a single-cell 3.7-4.2V litium-polymer battery) and unpopluated supply input to solder on your own PTH Barrel Jack (please be aware that the 3D model that we have on file does show a barrel jack attached, this is only for dimensional use since this breakout does not come with one attached). If you’ve used any Arduino before, this pinout shouldn’t surprise you – the layout meets the Arduino 1.0 footprint standard, including a separate SPI header and additional I2C header.
One of the most unique features of the SAMD21 is SERCOM – a set of six configurable serial interfaces that can be turned into either a UART, I2C master, I2C slave, SPI master, or SPI slave. Each SERCOM provides for a lot of flexibility: the ports can be multiplexed, giving you a choice of which task each pin is assigned.
The on-line SAMD21 Mini/Dev Breakout Hookup Guide (in the Documents section below) contains step by step instructions of how to connect your SparkFun SAMD21 Dev Breakout as well as a few circuit examples to test out. Full example code is provided and explained and even includes troubleshooting tips to make make you have zero problems.
- ATSAMD21G18 32-bit/48MHz ARM Cortex-M0+
- 256KB Flash Memory
- 32KB SRAM
- 32KB of EEPROM (emulated in Flash)
- 30 GPIO Count
- 14 ADC Channels at 12-bit Resolution
- Analog-to-Digital and Digital-to-Analog Converters (ADC & DAC)
- Vin: 4.2V-6.0V for charger – otherwise 3.5V-6.0V
- VBATT: 3.7V Lipo
- VCC: 600mA @3.3V
- Arduino R3 Layout
- Integrated USB Controller