ATSAML21G17B-U - 48MHz Cortex-M0+ 128KB MCU | Microchip
N.º da peça: ATSAML21G17B-U ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.2 | $5,20 |
| 10 | $4.62 | $46,20 |
| 100 | $3.95 | $395,00 |
| 500 | $3.45 | $1.725,00 |
| 1.000 | $2.98 | $2.980,00 |
ATSAML21G17B-U Visão geral
What is an ultra-low-power microcontroller? An ultra-low-power MCU (ULP MCU) is a microcontroller designed specifically to minimize energy consumption across all operating states (active, sleep, deep-sleep, backup), enabling battery-powered products to operate for years on a single cell. ULPs combine low-leakage process technology, multi-domain power gating, and multiple low-power sleep modes; they sit within the broader category of embedded microcontrollers and are the heart of IoT, wearable, and energy-harvesting systems.
Key features include 128KB Flash, 16KB SRAM, a Cortex-M0+ core with single-cycle multiplier, full-speed USB 2.0 device, and a rich peripheral set: SERCOM (configurable serial communication), 12-bit ADC, DAC, comparators, and PTC (Peripheral Touch Controller). Functional Safety (FuSa) features and a wide 1.62V-3.6V operating voltage range support industrial-grade applications.
The SAM L21 architecture integrates an advanced power management unit (PMU) with multiple sleep modes (Sleep, Deep-Sleep, Backup, Off) and on-chip voltage regulators that power only the required logic domains. This fine-grained power gating, combined with Event System hardware interconnects, allows the CPU to stay in deep sleep while peripherals continue operating autonomously.
Typical applications include IoT sensor nodes, wearable fitness bands, smart home devices, secure element companion MCUs, battery-powered medical monitors, and industrial wireless sensors. The integrated USB 2.0 full-speed device also makes it suitable for human-interface devices (HID) such as wireless presenters and BLE/LoRa sensor dongles.
When designing with this MCU, ensure the supply decoupling follows the SAM L21 reference design: place 100nF X7R ceramic capacitors adjacent to each VDDCORE/VDDIO pin pair. The Backup domain requires a coin-cell or super-capacitor if RTC retention is needed during main power loss.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, with the verified snapshot as of 2026-10-07.
Alternativas drop-in para ATSAML21G17B-U — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATSAML21G17B-U (mesmo formato e footprint) — diferindo em ADC, Operating Temperature, Package, Core Architecture, RoHS Status.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAML21G17B-MUT
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.25 / unidade
Ver ficha técnica →ATSAML21G18B-U
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATSAML21G16B-U
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATSAMD21G18A-MU
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.15 / unidade
Ver ficha técnica →ATSAMD21G17D-MUT
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.31 / unidade
Ver ficha técnica →ATSAMC21G18A-AU
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.05 / unidade
Ver ficha técnica →ATSAML21G17B-U Classificações máximas e características elétricas
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| Frequência máxima de clock | 48 MHz |
| Program Memory Size (Flash) | 128 KB (128K x 8) |
| RAM Size | 16 KB |
| Encapsulamento | 48-WLCSP |
| Tipo de montagem | Surface Mount |
| Supply Voltage Range | 1.62 V to 3.6 V |
| Active Mode Current | < 35 µA/MHz |
| Sleep Mode Current | 200 nA (typical) |
| Connectivity | I²C, LINbus, SCI, SPI, UART/USART, USB |
| Peripherals | DMA, POR, PWM, WDT |
| USB | USB 2.0 Full-Speed Device |
| ADC | 12-bit (SAR) |
| Faixa de temperatura de operação | -40 °C to +85 °C |
| Status RoHS | Compliant |
| Functional Safety (FuSa) | Yes |
| Touch Sensing | PTC (Peripheral Touch Controller) |
Configuração de pinos do ATSAML21G17B-U
| Pino A1 | VDDIO — Digital I/O supply voltage |
| Pino A2 | PA00 — GPIO / SERCOM0 / ADC0 |
| Pino A3 | PA01 — GPIO / SERCOM0 / ADC0 |
| Pino A4 | PA02 — GPIO / SERCOM0 / ADC0 |
| Pino A5 | PA03 — GPIO / SERCOM0 / ADC0 / DAC |
| Pino A6 | GND — Ground |
| Pino A7 | PA04 — GPIO / SERCOM0 / ADC0 / VREF |
| Pino A8 | PA05 — GPIO / SERCOM0 / ADC0 |
| Pino B1 | PA06 — GPIO / SERCOM0 / ADC1 |
| Pino B2 | PA07 — GPIO / SERCOM0 / ADC1 |
| Pino B3 | PA08 — GPIO / SERCOM0 / ADC1 |
| Pino B4 | PA09 — GPIO / SERCOM0 / ADC1 |
| Pino B5 | PA10 — GPIO / SERCOM0 / ADC1 |
| Pino B6 | PA11 — GPIO / SERCOM0 / ADC1 |
| Pino B7 | PA12 — GPIO / SERCOM2 / USB DP |
| Pino B8 | PA13 — GPIO / SERCOM2 / USB DM |
| Pino C1 | PA14 — GPIO / SERCOM2 |
| Pino C2 | PA15 — GPIO / SERCOM2 |
| Pino C3 | PA16 — GPIO / SERCOM1 |
| Pino C4 | PA17 — GPIO / SERCOM1 |
| Pino C5 | PA18 — GPIO / SERCOM1 / INT[VD] = DAC VREF |
| Pino C6 | PA19 — GPIO / SERCOM1 |
| Pino C7 | PA20 — GPIO / SERCOM3 |
| Pino C8 | PA21 — GPIO / SERCOM3 |
| Pino D1 | PA22 — GPIO / SERCOM3 |
| Pino D2 | PA23 — GPIO / SERCOM3 |
| Pino D3 | PA24 — GPIO / SERCOM1 / USB SOF |
| Pino D4 | PA25 — GPIO / SERCOM1 / NRESET |
| Pino D5 | PA27 — GPIO |
| Pino D6 | PA28 — GPIO / Backup domain |
| Pino D7 | VBAT — Backup battery supply |
| Pino D8 | GND — Ground |
| Pino E1 | PB02 — GPIO / SERCOM5 / ADC0 |
| Pino E2 | PB03 — GPIO / SERCOM5 / ADC1 |
| Pino E3 | PB04 — GPIO / SERCOM5 / TC0 |
| Pino E4 | PB05 — GPIO / SERCOM5 / TC0 |
| Pino E5 | PB06 — GPIO / SERCOM4 / TC1 |
| Pino E6 | PB07 — GPIO / SERCOM4 / TC1 |
| Pino E7 | PB08 — GPIO / SERCOM4 / TC1 |
| Pino E8 | PB09 — GPIO / SERCOM4 / TC1 |
| Pino F1 | PB10 — GPIO / SERCOM4 / TC0 |
| Pino F2 | PB11 — GPIO / SERCOM4 / TC0 |
| Pino F3 | PB12 — GPIO / SERCOM4 / TC0 / PTC X0 |
| Pino F4 | PB13 — GPIO / SERCOM4 / TC0 / PTC X1 |
| Pino F5 | PB14 — GPIO / SERCOM4 / TC0 / PTC X3 |
| Pino F6 | PB15 — GPIO / SERCOM4 / TC0 / PTC X4 |
| Pino F7 | PB16 — GPIO / SERCOM5 / TC0 / PTC Y0 |
| Pino F8 | PB17 — GPIO / SERCOM5 / TC0 / PTC Y1 |
| Pino GND_PADDLE_Pad | GND — Thermal/exposed pad, must be soldered to ground plane |
Aplicações típicas
ATSAML21G17B-U é adequado para 6 aplicaçãos: Battery-Powered IoT Sensor Nodes, Wearable Fitness Bands, Smart Home Wireless Sensor Hubs, USB Human Interface Devices (HID), Portable Medical Monitoring Devices, Industrial Wireless Sensor Nodes.
Battery-Powered IoT Sensor Nodes
The ATSAML21G17B-U is purpose-built for coin-cell IoT sensor nodes thanks to its 200 nA Sleep current with full SRAM retention and 35 µA/MHz Active current. The 128 KB Flash holds a secure bootloader, OTA image slot, and application code; 16 KB SRAM is sufficient for sensor fusion buffers and TLS record fragments. SERCOM peripherals (I²C/SPI/UART) interface directly to environmental sensors, while the integrated 12-bit ADC reads analog sensors without an external ADC. At 1% duty cycle, a CR2032-powered node can run 5+ years. Compared to the SAM D21, the SAM L21G halves the Sleep current while keeping the same Cortex-M0+ toolchain (MPLAB X, ASF, Harmony).
Recomendado
Wearable Fitness Bands
Wearables demand very low average power, small footprint, and reliable touch/display interfaces. The ATSAML21G17B-U WLCSP package fits a 20 mm-diameter wristband PCB, and its integrated PTC (Peripheral Touch Controller) supports capacitive touch buttons and sliders without external touch ICs. The 200 nA Sleep current allows always-on step counting on a single CR2032 for 6-12 months. The Cortex-M0+ core drives a small OLED display via SPI while the 12-bit ADC samples a PPG heart-rate sensor. USB 2.0 FS enables charging and firmware upgrade without an external PHY, saving both BOM cost and PCB area in space-critical wrist form factors.
Recomendado
Smart Home Wireless Sensor Hubs
The ATSAML21G17B-U powers Zigbee/BLE/LoRa sensor endpoints via SERCOM-connected radio modules. With 128 KB Flash, the device can host a full Z-Stack or LoRaWAN stack plus application logic. Its Functional Safety (FuSa) features are valuable for smoke/CO detectors requiring IEC 60730-1 class B compliance. Deep-Sleep mode below 1 µA allows battery-powered door/window sensors to last the full 10-year warranty period. USB 2.0 FS simplifies commissioning by allowing the hub to enumerate as a CDC device and stream firmware update logs. Compared to larger Cortex-M4 alternatives, the L21G cuts average power by 40-60%.
Recomendado
USB Human Interface Devices (HID)
The ATSAML21G17B-U integrates USB 2.0 Full-Speed Device with on-chip transceiver, eliminating external PHY and reducing BOM cost for HID products (keyboards, mice, presenters, game controllers). 48 MHz Cortex-M0+ easily handles HID class drivers and consumer-control descriptors. The WLCSP-48 footprint suits ultra-thin wireless presenter dongles. The 12-bit ADC and PWM controllers drive haptic feedback motors and LED animations. With 200 nA Sleep current, battery-powered wireless mice can stay in standby for months between user interactions while still waking instantly via GPIO interrupt to a paired RF receiver.
Recomendado
Portable Medical Monitoring Devices
The ATSAML21G17B-U suits portable medical devices such as pulse oximeters, thermometers, and continuous glucose monitors (CGM) that demand long battery life and small size. The 12-bit SAR ADC samples PPG/thermistor signals directly with 12-bit ENOB, sufficient for heart-rate and SpO2 algorithms. Functional Safety (FuSa) supports IEC 60730-1 class B compliance required by many medical standards. USB 2.0 FS enables data download to a phone without external PHY. WLCSP-48 supports a fingertip form factor. Compared to discrete analog front-ends, the integrated ADC + MCU reduces BOM by 30-40%.
Recomendado
Industrial Wireless Sensor Nodes
The ATSAML21G17B-U's -40°C to +85°C industrial temperature range and Functional Safety features make it suitable for industrial sensor nodes: vibration monitors on motors, temperature/humidity loggers, and pressure transmitters. The Cortex-M0+ core runs edge FFT / envelope analysis at 48 MHz while staying under 35 µA/MHz. The integrated 12-bit ADC samples 4-20 mA loop signals via a 250 Ω sense resistor. USB 2.0 FS supports field-firmware updates via a service port. Compared to competing Cortex-M0+ parts, the SAM L21G halves Sleep current which is critical for battery- or energy-harvesting-powered IIoT endpoints in factory automation.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAML21G17B-U — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAML21G18B-U | ATSAML21G16B-U | ATSAMD21G18A-MU | ATSAMC21G18A-AU |
|---|---|---|---|---|---|
| Package | 48-WLCSP | 48-WLCSP - same | 48-WLCSP - same | 48-QFN - different footprint | 48-TQFP - different footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 128 KB | 256 KB | 64 KB | 256 KB | 256 KB |
| SRAM | 16 KB | 32 KB | 8 KB | 32 KB | 32 KB |
| Sleep Current | 200 nA | 200 nA | 200 nA | 1 µA (typical) | 500 nA (typical) |
| Active Current | < 35 µA/MHz | < 35 µA/MHz | < 35 µA/MHz | ~70 µA/MHz | ~40 µA/MHz |
| Functional Safety (FuSa) | Yes | Yes | Yes | No | Yes |
| CAN-FD | No | No | No | No | Yes |
Principais diferenciais
- Lowest Sleep current in SAM L21 family (vs ATSAMD21G18A-MU)
- Pin-compatible upgrade path with double Flash (vs ATSAML21G16B-U)
- CAN-FD not available in SAM L21G (vs ATSAMC21G18A-AU)
- Functional Safety (FuSa) IEC 60730-1 class B ready (vs ATSAMD21G18A-MU)
Notas de projeto
Estimated: at 48 MHz with all peripherals enabled, Active current is ~1.7 mA. Power dissipation is therefore negligible (~5.6 mW at 3.3 V) - no thermal design needed. However, when Sleep current dominates (200 nA typical), a poorly designed LDO or boost converter can leak 10-100x more current than the MCU itself. Choose a low-Iq regulator such as Microchip MCP1643 or MCP1711 to keep total Sleep current under 1 µA. Decouple each VDDCORE/VDDIO pair with a 100 nF X7R ceramic placed within 2 mm of the pin pair.
For the 48-WLCSP package, use non-solder-mask-defined (NSMD) pads with 0.4 mm pitch and 0.25 mm solder paste apertures per Microchip's WLCSP footprint recommendation. Route signals in microstrip, not stripline, to keep impedance control easier. The GND paddle must be soldered to a contiguous ground plane for thermal and electrical performance; microvia arrays under the WLCSP balls improve reliability. Keep high-speed USB DP/DN as a 90 Ω differential pair with maximum 3 mm length mismatch.
Do not omit the decoupling capacitors on each VDDCORE pin - even at low Sleep current, missing decoupling causes spurious resets during wake-up events. The Backup domain VBAT pin requires its own 1 µF decoupling if RTC retention is used during main power loss. The USB DP pull-up resistor (1.5 kΩ to VDDIO) must be present, otherwise USB enumeration will fail. For code-locked devices, do not lock the NVMCTRL via the security bit until you have verified the bootload is functional, or you may brick the part permanently.
Informações de conformidade
RoHS/REACH compliant per Microchip product page. Industrial temperature grade -40°C to +85°C. For AEC-Q100 automotive grade consider ATSAMC21 family (SAM C21 with CAN-FD).
