ATSAML21G17B-ANT - 48MHz ARM M0+ MCU 128KB | Microchip
MPN: ATSAML21G17B-ANT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.32 | $4.32 |
| 10 | $3.85 | $38.50 |
| 100 | $3.42 | $342.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.71 | $2,710.00 |
ATSAML21G17B-ANT Overview
A microcontroller (MCU) is an integrated circuit that combines a processor core, program memory (Flash), working memory (RAM), and a rich set of peripherals on a single chip. The Cortex-M0+ core is the most energy-efficient member of the ARM Cortex-M family and targets 8/16-bit migration designs where ultra-low power and deterministic interrupt response are critical. The SAM L21 extends this with Microchip's proprietary picoPower technology, event system, and SleepWalking peripherals that allow automated peripheral interaction without waking the CPU.
Key features include 128 KB Flash (128K x 8), 16 KB SRAM, an 8-channel event system, up to 5 SERCOM serial communication peripherals (each reconfigurable as UART/SPI/I2C), a 12-bit 1 MSPS ADC, two analog amplifiers, two 24-bit timers, and a Real-Time Clock (RTC) with calendar and alarm. The device operates across 1.62 V to 3.63 V supply range, supports SleepWalking, has multiple low-power modes (Idle, Standby, Backup, Off), and provides a peripheral touch controller as well as a USB 2.0 Full-Speed device interface.
Architecturally, the SAM L21 uses a Harvard bus architecture with separate AHB and APB bridges, providing deterministic memory access. The integrated voltage regulator supports core voltages down to 1.2 V with on-the-fly voltage scaling, enabling fine-grained power budgeting. The Peripheral Event System allows direct hardware-triggered communication between peripherals, offloading work from the CPU and supporting SleepWalking where peripherals can react to events without CPU intervention, achieving nA-range standby currents.
Typical applications include battery-powered IoT sensor nodes, wearable health and fitness devices, smart home and HVAC remote controls, industrial wireless sensor networks, energy-harvesting endpoints, and consumer electronics requiring long battery life. The functional safety features make it particularly well-suited for white goods, fire and security alarm systems, and other IEC 60730-compliant appliances.
When designing with this device, pay careful attention to the decoupling network (at minimum 100 nF X7R on each VDD pin plus a 4.7 µF bulk), use the on-board voltage regulator with the recommended inductor and capacitor combination for the DC-DC switch-mode power supply, and consult the errata sheet for revision-specific workarounds. Proper SleepWalking configuration can reduce average current by an order of magnitude in interrupt-driven applications.
This page consolidates distributor pricing, drop-in pin-compatible alternatives within the SAM L21 family, and practical design notes not found in the manufacturer datasheet, helping engineers select the right variant and shorten their design cycle.
Drop-in alternatives for ATSAML21G17B-ANT — 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 ATSAML21G17B-ANT (same form factor and footprint) — differing in Package, ADC, RoHS Status, SRAM, Sleep Mode Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML21G16B-ANT
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →ATSAML21G18B-ANT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.78 / Unit
View Datasheet →ATSAML21E16B-AUT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAML21E15B-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.98 / Unit
View Datasheet →ATSAML21J17B-AUT
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →ATSAML21G17B-ANT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Family | SAM L21 (Functional Safety / FuSa) |
| Maximum CPU Frequency | 48 MHz |
| Flash Memory | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Supply Voltage | 1.62 V to 3.63 V |
| Active Current | Under 35 µA/MHz |
| Sleep Mode Current | 200 nA |
| Package | 48-TQFP (7x7 mm) |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| Number of I/O Pins | 37 |
| SERCOM Modules | Up to 5 (UART/SPI/I²C configurable) |
| ADC | 12-bit, 1 MSPS, up to 20 channels |
| Timers | Two 24-bit TC, one 16-bit TCC |
| RTC | Yes, with calendar and alarm |
| USB | USB 2.0 Full-Speed Device |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAML21G17B-ANT Pin Configuration
| Pin 1 | PA03 — GPIO/ADC reference |
| Pin 2 | PA04 — GPIO/ADC |
| Pin 3 | PA05 — GPIO/ADC |
| Pin 4 | PA06 — GPIO/ADC |
| Pin 5 | PA07 — GPIO/ADC |
| Pin 6 | VDDIO — I/O supply voltage |
| Pin 7 | VDD — Digital supply voltage |
| Pin 8 | GND — Ground |
| Pin 9 | PA08 — GPIO/NMI |
| Pin 10 | PA09 — GPIO |
| Pin 11 | PA10 — GPIO |
| Pin 12 | PA11 — GPIO |
| Pin 13 | PA12 — GPIO |
| Pin 14 | PA13 — GPIO |
| Pin 15 | PA14 — GPIO/XTAL32 |
| Pin 16 | PA15 — GPIO/XTAL32 |
| Pin 17 | PA16 — GPIO |
| Pin 18 | PA17 — GPIO |
| Pin 19 | PA18 — GPIO |
| Pin 20 | PA19 — GPIO |
| Pin 21 | PA20 — GPIO |
| Pin 22 | PA21 — GPIO |
| Pin 23 | PA22 — GPIO |
| Pin 24 | PA23 — GPIO |
| Pin 25 | PA24 — GPIO |
| Pin 26 | PA25 — GPIO |
| Pin 27 | GND — Ground |
| Pin 28 | VDD — Digital supply voltage |
| Pin 29 | PB02 — GPIO/ADC |
| Pin 30 | PB03 — GPIO/ADC |
| Pin 31 | PB04 — GPIO/ADC |
| Pin 32 | PB05 — GPIO/ADC |
| Pin 33 | PB06 — GPIO/ADC |
| Pin 34 | PB07 — GPIO/ADC |
| Pin 35 | PB08 — GPIO/ADC |
| Pin 36 | PB09 — GPIO/ADC |
| Pin 37 | PB10 — GPIO |
| Pin 38 | PB11 — GPIO |
| Pin 39 | PB12 — GPIO |
| Pin 40 | PB13 — GPIO |
| Pin 41 | PB14 — GPIO |
| Pin 42 | PB15 — GPIO |
| Pin 43 | PB16 — GPIO |
| Pin 44 | PB17 — GPIO |
| Pin 45 | PB22 — GPIO |
| Pin 46 | PB23 — GPIO |
| Pin 47 | GND — Ground |
| Pin 48 | VDDIO — I/O supply voltage |
Typical Applications
ATSAML21G17B-ANT is suitable for 6 applications: Battery-Powered IoT Sensor Node, Wearable Health and Fitness Device, Smart Home HVAC Remote Control, Industrial Wireless Sensor Network, Household Appliance Control Board, Energy-Harvesting Wireless Endpoint.
Battery-Powered IoT Sensor Node
The ATSAML21G17B-ANT excels in battery-powered IoT sensor nodes where its 200 nA Sleep mode current and 35 µA/MHz active current enable multi-year operation on a single coin cell. The Cortex-M0+ core running at 48 MHz handles sensor sampling, edge processing, and LoRaWAN/BLE protocol stacks with headroom to spare. SleepWalking peripherals trigger wake-ups only on sensor threshold crossings, keeping average current below 5 µA in typical deployment scenarios. The 128 KB Flash accommodates over-the-air firmware update slots for full OTA support.
Recommended
Wearable Health and Fitness Device
For wearables, the ATSAML21G17B-ANT delivers the right balance of low power, integrated peripherals, and code space. The 12-bit 1 MSPS ADC captures biometric signals from PPG and ECG sensors with high fidelity, while the 200 nA Sleep current preserves battery life between measurements. The integrated RTC with calendar supports sleep-tracking algorithms, and 16 KB SRAM buffers sensor data before radio transmission. The 48-TQFP 7x7 mm package fits comfortably inside wristband form factors.
Recommended
Smart Home HVAC Remote Control
The ATSAML21G17B-ANT's Functional Safety features and ultra-low-power profile make it ideal for smart home HVAC remote controls and thermostats. The Cortex-M0+ handles RF4CE, Zigbee, or BLE stack execution, while SleepWalking allows the device to wake on user button presses without polling. The 5 configurable SERCOM modules support multi-protocol sensor interfaces (I²C temp/humidity, SPI display, UART radio). Operating from 2 AAA cells down to 1.8 V is fully supported by the wide 1.62-3.63 V supply range.
Recommended
Industrial Wireless Sensor Network
In industrial wireless sensor networks, the ATSAML21G17B-ANT provides deterministic real-time response and ultra-low power consumption for battery or energy-harvesting endpoints. The Peripheral Event System enables direct hardware-triggered data acquisition without CPU wake-up, achieving sub-µA standby currents in vibration, temperature, and pressure monitoring nodes. The 48 MHz core runs WirelessHART or IO-Link wireless stacks, while 128 KB Flash stores protocol libraries, application code, and OTA staging areas.
Recommended
Household Appliance Control Board
For IEC 60730 Class B functional safety compliance, the ATSAML21G17B-ANT integrates the necessary FuSa features including dual watchdog timers, clock failure detection, and CRC peripherals. The Cortex-M0+ runs motor control algorithms for washing machines, dishwashers, and induction cooktops while the safety library validates each I/O operation. The 200 nA Sleep mode supports standby energy regulations, and the 48-TQFP package simplifies PCB layout in space-constrained appliance enclosures.
Recommended
Energy-Harvesting Wireless Endpoint
Energy-harvesting applications benefit from the ATSAML21G17B-ANT's 200 nA Sleep current, allowing it to operate from harvested energy sources like indoor photovoltaics or piezoelectric vibration harvesters. The integrated DC-DC converter efficiently manages the variable supply from energy harvesters, while the Event System enables efficient wake-on-sensor architectures. The 48-TQFP package and industrial temperature range support deployment in outdoor and industrial environments with energy autonomy measured in years.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML21G17B-ANT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML21G16B-ANT | ATSAML21G18B-ANT | ATSAML21E16B-AUT | ATSAML21E15B-AUT | ATSAML21J17B-AUT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 64-QFN - different |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 128 KB | 64 KB (-50%) | 256 KB (+100%) | 64 KB (-50%) | 32 KB (-75%) | 128 KB (same) |
| SRAM | 16 KB | 8 KB | 32 KB | 8 KB | 4 KB | 16 KB |
| Active Current | Under 35 µA/MHz | Under 35 µA/MHz | Under 35 µA/MHz | Under 35 µA/MHz | Under 35 µA/MHz | Under 35 µA/MHz |
| Sleep Current | 200 nA | 200 nA | 200 nA | 200 nA | 200 nA | 200 nA |
| Number of I/O | 37 | 37 | 37 | 26 | 26 | 51 |
| Functional Safety | Yes (IEC 60730 Class B) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Industry-leading Sleep current for the Cortex-M0+ class (vs ATSAML21E16B-AUT)
- Functional Safety features integrated on-chip (vs ATSAML21J17B-AUT)
- More SERCOM channels in 48-TQFP package (vs ATSAML21G16B-ANT)
Design Notes
The ATSAML21G17B-ANT integrates a DC-DC switch-mode regulator that supplies the core at 1.2 V from VDD. Per the SAM L21 datasheet, connect a 4.7 µH inductor between VSW and the inductor pin, plus a 4.7 µF X7R capacitor on each VDD pin. Place the inductor and capacitors as close as possible to the IC with a star-ground topology to minimize ripple. Estimated: peak DC-DC efficiency exceeds 80% when VDD is 2.5-3.3 V and the core load is below 10 mA.
Place a 100 nF X7R decoupling capacitor within 3 mm of each VDD/VDDIO pin pair, with a 4.7 µF bulk capacitor near the package. Use a continuous ground plane on layer 2 (or layer 1 if 2-layer PCB) directly under the TQFP package to provide thermal dissipation and return path. Keep high-speed signal traces short and away from analog ADC inputs; add a guard ring around sensitive analog traces. The exposed pad (if present) must be soldered to the ground plane for thermal relief.
Do not enable the DC-DC regulator and the internal voltage regulator simultaneously - the SAM L21 supports only one mode at a time. Ensure the fuse bits are configured correctly for the chosen regulator topology (refer to the NVM user row mapping in the datasheet). The 32.768 kHz crystal oscillator requires careful PCB layout with the load capacitors placed within 2 mm of the XTAL pins; long traces cause startup failures. Always read the latest silicon errata before production programming.
Compliance Information
RoHS compliant per Microchip product page. Functional Safety (FuSa) features support IEC 60730 Class B compliance for household appliance applications. AEC-Q100 qualified automotive variants are available under different part numbers (ATSAML21E15B-AUT is automotive-grade; this G17B industrial variant is not AEC-Q100).
