ATSAMD20E16B-AU
ATSAMD20E16B-AU - 32-bit ARM Cortex-M0+ MCU, 64KB Flash, TQFP-32 | Microchip
The Microchip Technology ATSAMD20E16B-AU is a 32-bit ARM Cortex-M0+ flash microcontroller from the SAM D20E family, operating at up to 48 MHz with 64 KB of Flash and 8 KB of SRAM, housed in a 32-pin TQFP (7x7 mm) package. It integrates a peripheral touch controller supporting up to 256 channels, a 12-bit ADC, a 10-bit DAC, a full-speed USB 2.0 device controller, and multiple serial interfaces including SERCOM, I2C, SPI, and UART, making it a versatile SoC for connected embedded designs.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O on one silicon die. The Cortex-M0+ is ARM's smallest and most energy-efficient application processor core, optimized for deterministic interrupt response and ultra-low power operation, enabling battery-powered devices that wake quickly, execute brief tasks, and return to sleep. The SAM D20 family extends this with Microchip's proprietary low-power techniques and an event system that lets peripherals trigger each other without CPU involvement.
Key specifications of the ATSAMD20E16B-AU include a 1.62 V to 3.63 V supply range, six SERCOM channels configurable as I2C/SPI/UART, six timer/counter instances, a real-time clock, an integrated 32 kHz oscillator, and a full-speed USB 2.0 device port. The 12-bit ADC delivers up to 350 ksps with hardware oversampling to 16-bit effective resolution, while the 10-bit DAC supports waveform generation. The 256-channel peripheral touch controller (PTC) enables robust capacitive touch interfaces without external components.
Architecturally, the device uses a single-cycle I/O bus for deterministic GPIO access, an event system for inter-peripheral signaling, and SleepWalking peripherals that can wake the CPU only when meaningful data is present. This combination yields active currents under 4 mA at 48 MHz and deep-sleep currents below 5 microamperes with RTC retention, qualifying it for energy-harvesting and coin-cell designs.
Typical applications include home automation nodes, smart metering endpoints, consumer Human-Machine Interface (HMI) with capacitive touch, industrial sensor transmitters, USB HID peripherals, and low-power wireless sensor hubs pairing with sub-GHz or BLE modules. Its blend of analog integration, USB, and touch makes it a strong single-chip solution when bill-of-materials cost and PCB area are critical.
When designing with this device, ensure the VDDCORE pin is decoupled with a 1 uF X7R ceramic capacitor close to the package, and use the on-chip voltage regulator in normal mode rather than bypassing it. Decoupling the USB VBUS pin with 4.7 uF and adding 90-ohm differential impedance-controlled traces on D+/D- are mandatory for USB compliance. The B variant adds an enhanced PTC and improved ADC; firmware written for ATSAMD20E16A rev A silicon may need migration to the latest ASF4 / MCC peripheral drivers.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for part selection, sourcing, and PCB bring-up.
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