2 Configuration Summary
| SAM L21J | SAM L21G | SAM L21E | |
|---|---|---|---|
| Pins | 64 | 48 | 32 |
| General Purpose I/O-pins (GPIOs) | 51 | 37 | 25 |
| Flash | 256/128/64-KB | 256/128/64-KB | 256/128/64/32-KB |
| Flash RWW section | 8/4/2-KB | 8/4/2-KB | 8/4/2/1-KB |
| System SRAM | 32/16/8-KB | 32/16/8-KB | 32/16/8/4-KB |
| Low-power SRAM | 8/8/4-KB | 8/8/4-KB | 8/8/4/2-KB |
| Timer Counter (TC) instances(1) | 5 | 3 | 3 |
| Waveform output channels per TC instance | 2 | 2 | 2 |
| Timer Counter for Control (TCC) instances | 3 | 3 | 3 |
| Waveform output channels per TCC | 8/4/2 | 8/4/2 | 6/4/2 |
| DMA channels | 16 | 16 | 16 |
| USB interface | 1 | 1 | 1 |
| AES engine | 1 | 1 | 1 |
| Configurable Custom Logic (CCL) (LUTs) | 4 | 4 | 4 |
| True Random Generator (TRNG) | 1 | 1 | 1 |
| Serial Communication Interface (SERCOM) instances | 6 | 6 | 6 |
| Analog-to-Digital Converter (ADC) channels | 20 | 14 | 10 |
| Analog Comparators (AC) | 2 | 2 | 2 |
| Digital-to-Analog Converter (DAC) channels | 2 | 2 | 2 |
| Operational Amplifier (OPAMP) | 3 | 3 | 3 |
| Real-Time Counter (RTC) | Yes | Yes | Yes |
| RTC alarms | 1 | 1 | 1 |
| RTC compare values |
One 32-bit value or two 16-bit values |
One 32-bit value or two 16-bit values |
One 32-bit value or two 16-bit values |
| External Interrupt lines | 16 | 16 | 16 |
| Peripheral Touch Controller (PTC) channels (X- x Y-Lines) for mutual capacitance (2) |
169 (13x13) |
81 (9x9) |
42 (7x6) |
| Peripheral Touch Controller (PTC) channels for self capacitance (Y-Lines only) (3) | 16 | 10 | 7 |
| Maximum CPU frequency | 48 MHz | ||
| Packages |
QFN TQFP WLCSP(4) |
QFN TQFP |
QFN TQFP |
| Oscillators |
32.768 kHz crystal oscillator (XOSC32K) 0.4-32 MHz crystal oscillator (XOSC) 32.768 kHz internal oscillator (OSC32K) 32 KHz ultra low-power internal oscillator (OSCULP32K) 16/12/8/4-MHz high-accuracy internal oscillator (OSC16M) 48 MHz Digital Frequency Locked Loop (DFLL48M) 96 MHz Fractional Digital Phased Locked Loop (FDPLL96M) | ||
| Event System channels | 12 | 12 | 12 |
| SW Debug Interface | Yes | Yes | Yes |
| Watchdog Timer (WDT) | Yes | Yes | Yes |
Note:
- For SAM L21E and SAM L21G devices, only TC0, TC1 and TC4 are available.
- The number of X-lines and Y-lines depends on the configuration of the device, as some I/O lines can be configured as either X-lines or Y-lines. Refer to Multiplexed Signals for additional information. The number in the configuration summary is the maximum number of channels that can be obtained.
- The number of Y-lines depends on the configuration of the device, as some I/O lines can be configured as either X-lines or Y-lines. The number given here is the maximum number of Y-lines that can be obtained.
- WLCSP parts are programmed with a specific SPI bootloader. Refer to the Application Note “AT09002” for additional information.