| Base Product Number | ATSAMD21 |
| Category | Integrated Circuits (ICs) |
| Connectivity | I?C, LINbus, SPI, UART/USART |
| Core Processor | ARM? Cortex?-M0+ |
| Core Size | 32-Bit Single-Core |
| Data Converters | A/D 14x12b; D/A 1x10b |
| EEPROM Size | - |
| Mounting Type | Surface Mount |
| Number of I/O | 38 |
| Operating Temperature | -40?C ~ 85?C (TA) |
| Oscillator Type | Internal |
| Package | Tape & Reel (TR) |
| Package / Case | 48-VFQFN Exposed Pad |
| Peripherals | Brown-out Detect/Reset, DMA, I?S, POR, PWM, WDT |
| Product Status | Active |
| Program Memory Size | 128KB (128K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 16K x 8 |
| Speed | 48MHz |
| Supplier Device Package | 48-QFN (7x7) |
| Voltage - Supply (Vcc/Vdd) | 1.62V ~ 3.63V |