The Atmel ATSAMR21ZLL‑EK Evaluation Kit User Guide provides hardware overview, power options, connectors, and peripheral details for development.
This guide introduces the ATSAMR21ZLL‑EK evaluation kit, a hardware platform based on the Atmel ATSAMR21G18A microcontroller. It describes the kit’s features such as antenna diversity, RGB LED, OLED display, joystick, and various interfaces, and explains how the board integrates with Atmel Studio and BitCloud ZigBee® PRO libraries.
The document covers getting started with a quick‑start procedure, power‑supply options (EDBG USB, MCU USB, battery, external VCC), connector pin‑outs, and detailed information on peripherals including the crystal, RF interface, touch interface, RGB LED, OLED display, serial flash, temperature sensor, crypto authentication, and serial communication interfaces. It also includes certification information, revision history, and legal notices.
| External battery voltage range | 1.8 V to 4.5 V |
|---|---|
| External supply voltage range | 1.62 V to 3.63 V |
| External 32.768 kHz crystal | PA00 XIN, PA01 XOUT |
| External 16 MHz crystal | XTAL1 XIN, XTAL2 XOUT |
The kit can be powered via EDBG USB, MCU USB, a battery header (1.8 V‑4.5 V), an external supply (1.62 V‑3.63 V), or the EXT VCC header when other supplies are not present.