ATSAMD20G17A-AU - 48MHz Cortex-M0+ MCU, 128KB Flash | Microchip
MPN: ATSAMD20G17A-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
ATSAMD20G17A-AU Overview
An ARM Cortex-M0+ microcontroller is the smallest and most energy-efficient member of the Cortex-M family, designed for deeply embedded, low-power applications that benefit from a 32-bit instruction set, deterministic interrupt handling, and a rich peripheral ecosystem. It sits within the broader taxonomy of microcontrollers -> embedded processors -> semiconductors, and bridges 8-bit PIC/AVR designs to higher-performance Cortex-M3/M4 cores without sacrificing low-power operation.
Key features of the ATSAMD20G17A-AU include the SERCOM-configurable serial engine (up to 6 channels of I2C/SPI/UART), a 14-channel 12-bit ADC with up to 350 ksps sampling, one 10-bit DAC, six 16-bit timer/counters, and a full-speed USB 2.0 device port. Its peripheral touch controller (PTC) supports up to 256 channels for capacitive buttons, sliders, and proximity sensing, enabling HMI designs without external touch ICs.
The device employs Microchip's proprietary low-power architecture with multiple SleepWalking-enabled peripherals, six power domains, and a typical active current below 4 mA at 48 MHz. The integrated 32.768 kHz oscillator and fractional PLL reduce external component count, and the Event System allows peripherals to trigger each other autonomously without CPU intervention for ultra-low-power sensor polling.
Typical applications include home automation gateways, smart energy metering, industrial sensor nodes, consumer wearables, capacitive touch keypads, and low-cost USB HID peripherals. The wide operating temperature range of -40 C to +85 C makes it equally suitable for indoor consumer devices and harsh industrial environments.
When designing with this part, allocate the SERCOM channels early because each one is multiplexed across multiple pads, and plan the PTC layout with sufficient ground flood for reliable capacitive touch SNR. Use Microchip's MPLAB X IDE with the SAMD20 DFP to unlock SleepWalking and Event System configuration.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, accelerating your sourcing and schematic review.
Drop-in alternatives for ATSAMD20G17A-AU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMD20G17A-AU (same form factor and footprint) — differing in ADC, Package, DAC, Operating Temperature, Peripheral Touch Controller (PTC).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20G17A-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.42 / Unit
View Datasheet →ATSAMD20G18A-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.84 / Unit
View Datasheet →ATSAMD20E17A-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.5 / Unit
View Datasheet →ATSAMD21G18A-AU
✅ Drop-In✓ In Stock
$1.74 / Unit
View Datasheet →ATSAMD20G16A-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD20G17A-AU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Series | SAM D20G |
| Maximum CPU Frequency | 48 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| RAM Size | 16 KB (16K x 8) |
| Supply Voltage (Vcc/Vdd) | 1.62 V to 3.6 V |
| ADC | 14-channel, 12-bit, up to 350 ksps |
| DAC | 1-channel, 10-bit |
| Peripheral Touch Controller (PTC) | Up to 256 channels |
| SERCOM Modules | Up to 6 (configurable as I2C/SPI/UART) |
| USB | Full-Speed USB 2.0 Device |
| Timer/Counters | 6 x 16-bit |
| Operating Temperature | -40 C to +85 C |
| Package | 48-TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAMD20G17A-AU Pin Configuration
| Pin 1 | VDDIO — Digital I/O supply voltage |
| Pin 2 | PA00 — GPIO / ADC input AIN0 |
| Pin 3 | PA01 — GPIO / ADC input AIN1 |
| Pin 4 | PA02 — GPIO / ADC input AIN2 |
| Pin 5 | PA03 — GPIO / ADC input AIN3 |
| Pin 6 | GND — Ground |
| Pin 7 | PA04 — GPIO / ADC input AIN4 / VREF |
| Pin 8 | PA05 — GPIO / ADC input AIN5 |
| Pin 9 | PA06 — GPIO / ADC input AIN6 |
| Pin 10 | PA07 — GPIO / ADC input AIN7 |
| Pin 11 | VDDIO — Digital I/O supply voltage |
| Pin 12 | PA08 — GPIO / PTC X0 |
| Pin 13 | PA09 — GPIO / PTC X1 |
| Pin 14 | PA10 — GPIO / PTC X2 |
| Pin 15 | PA11 — GPIO / PTC X3 / USB D- |
| Pin 16 | PA12 — GPIO / PTC X4 / PTC Y0 |
| Pin 17 | PA13 — GPIO / PTC Y1 |
| Pin 18 | PA14 — GPIO / PTC Y2 |
| Pin 19 | PA15 — GPIO / PTC Y3 |
| Pin 20 | PA16 — GPIO / PTC Y4 / I2S SCK |
| Pin 21 | PA17 — GPIO / PTC Y5 / I2S FS |
| Pin 22 | PA18 — GPIO / PTC Y6 |
| Pin 23 | PA19 — GPIO / PTC Y7 |
| Pin 24 | PA20 — GPIO / PTC Y8 |
| Pin 25 | PA21 — GPIO / PTC Y9 |
| Pin 26 | PA22 — GPIO / PTC Y10 |
| Pin 27 | PA23 — GPIO / PTC Y11 |
| Pin 28 | PA24 — GPIO / USB D+ |
| Pin 29 | PA25 — GPIO |
| Pin 30 | GND — Ground |
| Pin 31 | PA26 — GPIO |
| Pin 32 | PA27 — GPIO |
| Pin 33 | PA28 — GPIO / Reset |
| Pin 34 | PA29 — GPIO / SWDIO |
| Pin 35 | PA30 — GPIO / SWCLK |
| Pin 36 | PA31 — GPIO |
| Pin 37 | PB00 — GPIO |
| Pin 38 | PB01 — GPIO |
| Pin 39 | PB02 — GPIO |
| Pin 40 | PB03 — GPIO |
| Pin 41 | PB04 — GPIO |
| Pin 42 | PB05 — GPIO |
| Pin 43 | PB06 — GPIO |
| Pin 44 | PB07 — GPIO |
| Pin 45 | PB08 — GPIO |
| Pin 46 | PB09 — GPIO / XOUT 32.768kHz crystal |
| Pin 47 | PB10 — GPIO / XIN 32.768kHz crystal |
| Pin 48 | VDDIN — Main voltage regulator input (1.62-3.6 V) |
Typical Applications
ATSAMD20G17A-AU is suitable for 6 applications: Home Automation Hubs and Smart Sensors, Smart Energy Meters and Power Monitoring, Industrial Sensor Nodes and IO-Link Devices, Capacitive Touch Keypads and Wearable HMIs, USB HID Peripherals and Consumer Dongles, Low-Cost Motor Control and BLDC Drivers.
Home Automation Hubs and Smart Sensors
The ATSAMD20G17A-AU's 48 MHz Cortex-M0+ core, 6 SERCOM channels, and 256-channel peripheral touch controller make it ideal for Zigbee/Wi-Fi/BLE bridge nodes and capacitive-touch wall switches. Its 1.62-3.6 V supply directly accepts single-cell Li-ion or 2xAA batteries, while SleepWalking peripherals let the MCU stay in deep sleep below 5 uA while still waking on sensor thresholds. Design tip: dedicate one SERCOM to the radio module's SPI, another to a host UART debug port, and use the PTC for touch keys.
Recommended
Smart Energy Meters and Power Monitoring
With its 14-channel 12-bit ADC at up to 350 ksps and six 16-bit timers, the ATSAMD20G17A-AU accurately samples current transformers and voltage dividers for Class-1 residential energy meters. The Event System lets timer-triggered ADC conversions run autonomously without CPU wake-up, keeping average current draw below 100 uA in metering mode. Full-speed USB 2.0 device enables direct data export to utility tablets or service tools without an extra interface IC.
Recommended
Industrial Sensor Nodes and IO-Link Devices
The ATSAMD20G17A-AU's industrial -40 C to +85 C temperature range, hardware AES (in larger SAM D21 siblings), and 48 MHz Cortex-M0+ deterministic interrupt latency make it suitable for IO-Link sensor transmitters and 4-20 mA loop-powered devices. With 6 SERCOM ports, the MCU can drive an SPI sensor, an I2C EEPROM, and a UART diagnostics channel simultaneously. The wide 1.62-3.6 V input accepts 24 V industrial rails after a single buck regulator step.
Recommended
Capacitive Touch Keypads and Wearable HMIs
The integrated Peripheral Touch Controller (PTC) supports up to 256 mutual-capacitance channels, enabling sliders, wheels, and matrix keypads without any external touch ASIC. Combined with the 128 KB Flash that comfortably fits Atmel Start / ASF touch libraries and 16 KB SRAM for gesture state machines, the ATSAMD20G17A-AU powers smart watches, fitness bands, and induction cooktop touch panels. Low-power PTC wake-on-touch keeps standby below 10 uA.
Recommended
USB HID Peripherals and Consumer Dongles
With integrated full-speed USB 2.0 device and 8 endpoints, the ATSAMD20G17A-AU enumerates directly as HID keyboard, mouse, gamepad, or CDC serial device - no external PHY required. The 48 MHz Cortex-M0+ handles HID report rates up to 1000 Hz easily, and 16 KB SRAM accommodates ring buffers for USB-to-UART bridges or HID-to-I2C adapters. The compact 48-TQFP (7x7 mm) footprint fits inside USB Type-A connector shells.
Recommended
Low-Cost Motor Control and BLDC Drivers
The six 16-bit timer/counters with PWM outputs and the 12-bit ADC's fast 350 ksps rate allow the ATSAMD20G17A-AU to drive 3-phase brushless DC motors up to a few hundred watts. The Event System synchronizes ADC sampling with PWM edges for low-jitter back-EMF sensing, and the Cortex-M0+ deterministic interrupt response keeps commutation latency under 1 us. Drop-in upgrade to ATSAMD21G18A-AU enables FOC firmware needing extra Flash space.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20G17A-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20G17A-AUT | ATSAMD20G18A-AU | ATSAMD20E17A-AU | ATSAMD21G18A-AU | ATSAMD20G16A-AU |
|---|---|---|---|---|---|---|
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz |
| Flash Memory | 128 KB | 128 KB (same) | 256 KB (+100%) | 128 KB (same) | 256 KB (+100%) | 64 KB (-50%) |
| SRAM | 16 KB | 16 KB (same) | 32 KB (+100%) | 16 KB (same) | 32 KB (+100%) | 8 KB (-50%) |
| Series | SAM D20G | SAM D20G | SAM D20G | SAM D20E (low-power) | SAM D21G (upgraded) | SAM D20G |
| USB | Full-Speed USB 2.0 Device | Full-Speed USB 2.0 Device | Full-Speed USB 2.0 Device | Full-Speed USB 2.0 Device | Full-Speed USB 2.0 Device + Host | Full-Speed USB 2.0 Device |
| Peripheral Touch Controller | Yes (up to 256 channels) | Yes (up to 256 channels) | Yes (up to 256 channels) | Yes (up to 256 channels) | Yes (up to 256 channels) | Yes (up to 256 channels) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Balanced memory and peripheral set at 48 MHz in mainstream 48-TQFP (vs ATSAMD20G16A-AU)
- Drop-in upgrade path to 256 KB Flash in identical footprint (vs ATSAMD21G18A-AU)
- Lower-power SleepWalking alternative in same footprint (vs ATSAMD20E17A-AU)
- Industrial-grade operating range and full-speed USB on-chip (vs PIC16F1827-I/P)
Design Notes
Decouple VDDIN (pin 48) with a 4.7 uF X5R ceramic plus a 100 nF X7R placed within 3 mm of the pin. Tie VDDIO pins 1 and 11 to the same 3.3 V rail with their own 100 nF caps. Estimated: total bulk-cap ESR budget should stay below 50 milliohms to hold VDD ripple under 50 mVpp during 48 MHz Cortex-M0+ peaks at ~8 mA active current.
Route the SWDIO (PA29) and SWCLK (PA30) signals as a 100-ohm-impedance differential pair directly to a 2x5 0.05-inch Cortex Debug header. Keep RESET (PA28) trace short; add a 1 nF + 10 kohm pull-up to VDDIO for noise immunity. Place the optional 32.768 kHz crystal between PB09 and PB10 within 5 mm of the IC, with grounded guard traces on both sides.
Do not exceed 3.6 V on any VDDIO pin; connecting a 5 V USB VBUS directly to PA24/PA25 will damage the USB pad. Use an external 3.3 V LDO (e.g., MCP1700) and 5kohm + 10kohm resistor dividers or series diode to step down. Also remember that SERCOM pads are multiplexed - in Microchip's START pin-mux tool, re-assigning SERCOM0 from PA08/PA09 to PA16/PA17 requires both software register changes and physical trace routing on the PCB.
When routing USB DP (PA24) and DM (PA15), maintain 90-ohm differential impedance, keep the pair length-matched within 2 mm, and place a common-mode choke plus ESD array (such as USBLC6-2SC6) within 5 mm of the connector. Estimated: total USB trace capacitance should not exceed 50 pF to stay within USB 2.0 full-speed rise-time budget.
Compliance Information
RoHS and REACH compliance confirmed on Microchip product page and DigiKey listing. Industrial -40C to +85C grade; AEC-Q100 automotive qualification not available - choose ATSAMx automotive variants if needed.
