Atmel SAM-D20 low-power microcontrollers

Atmel SAM-D20 microcontrollers target low-power applications that require in-system programmability. The microcontrollers have up to 256 KB of Flash and 32 KB of SRAM. Up to 52 programmable input/output pins are available along with a 32-bit real-time clock calendar (RTCC).

Eight 16-bit timers are available, each of which can be configured to perform frequency or waveform generation, input capture with time and frequency measurement, or program execution timing. A 20-channel 12-bit ADC and a 10-bit DAC allow for efficient sampling and generation of external analog signals. The ARM Cortex-M0+ core supports 32 interrupts and offers a single-cycle 32x32 multiplier for support of math-intensive algorithms. Atmel’s Peripheral Touch Controller provides a 256-channel capacitive touch and proximity sensing capability.

Low-power design is simplified with two software-selectable sleep modes. In idle mode, the core is stopped while selected peripherals are still running. In standby mode, all clocks and peripherals can be stopped except for those specifically selected to be kept on. SleepWalking allows the microcontroller core to sleep until an important event pokes it awake, an efficient alternative to polling peripherals with an interval timer.