ATSAMD21J17A-AF - 48MHz Cortex-M0+ MCU, 128KB Flash, USB | Microchip
N.º da peça: ATSAMD21J17A-AF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.99 | $1.495,00 |
| 1.000 | $2.65 | $2.650,00 |
ATSAMD21J17A-AF Visão geral
An MCU (microcontroller) is a single-chip computer integrating a CPU core, program and data memory, and configurable peripherals on one silicon die. The ARM Cortex-M0+ is the most energy-efficient ARM processor core for embedded applications, and Microchip's SAM D21 family extends the Cortex-M0+ with a dedicated event system, SERCOM peripherals, and a SleepWalking power-management architecture. The 'J' suffix denotes the high-pin-count 64-pin variant, providing maximum GPIO and peripheral accessibility versus the 'G' (48-pin) and 'E' (32-pin) siblings.
Key differentiating specifications include 128 KB of Flash with 4 KB of read-while-write (RWW) EEPROM emulation, six SERCOM channels each independently configurable as I2C, SPI, or USART, an integrated USB 2.0 Full-Speed device with on-chip transceiver, and an operating voltage range of 1.62 V to 3.63 V. The 12-bit ADC offers up to 20 analog input channels with hardware oversampling, and the device achieves 2.46 CoreMark/MHz, delivering ~118 CoreMark at maximum clock. Industrial temperature range is -40C to +125C.
Architecturally, the SAM D21 family uses a single AHB/APB bus matrix with a separate bridge for the SERCOM modules, enabling deterministic DMA-driven I/O. The SleepWalking event system allows peripherals to wake the core only on relevant events, dramatically reducing active-mode current in battery-powered applications where quiescent draw dominates. The integrated USB PHY eliminates external transceiver circuitry, saving BOM cost and PCB area in HID, CDC, and composite-USB designs.
Typical applications include USB Human Interface Devices, home automation gateways, low-power wireless sensor nodes, smart metering, industrial control panels, and consumer wearables. The integrated USB device controller and rich SERCOM set simplify designs requiring multiple serial protocols without external glue logic, and the 4 KB RWW EEPROM area is well-suited to data logging applications requiring non-volatile parameter storage without an external EEPROM chip.
When designing with this device, allocate the 128 KB Flash carefully: approximately 8 KB is consumed by the SAM D21 bootloader, leaving ~120 KB for application code. Use Atmel Studio 7, MPLAB X IDE, or MPLAB Harmony 3 with the START code-configurator for peripheral initialization, and budget quiescent current carefully: full Sleep mode draws under 10 uA, but active peripherals can dominate consumption.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para ATSAMD21J17A-AF — 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 ATSAMD21J17A-AF (mesmo formato e footprint) — diferindo em ADC, Operating Temperature, Package, Flash Memory, DAC.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAMD21J17B-AF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATSAMD21J18A-AF
✅ Drop-In✓ Em estoque
$2.99 / unidade
Ver ficha técnica →ATSAMD21J16B-AF
✅ Drop-In✓ Em estoque
$2.52 / unidade
Ver ficha técnica →ATSAMC21J17A-AF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATSAMD21G18A-MU
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.15 / unidade
Ver ficha técnica →ATSAMD21J17A-AF Classificações máximas e características elétricas
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Frequência máxima de clock | 48 MHz |
| CoreMark Score | 2.46 CoreMark/MHz (~118 CoreMark) |
| Flash Memory | 128 KB (with 4 KB RWW) |
| SRAM | 16 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| Faixa de temperatura de operação | -40C to +125C (industrial) |
| Encapsulamento | 64-pin TQFP (10x10 mm), 0.5 mm pitch |
| Tipo de montagem | Surface Mount (Gull-wing) |
| USB Interface | USB 2.0 Full-Speed Device with on-chip transceiver |
| SERCOM Modules | 6 (each configurable as I2C/SPI/UART/USART) |
| ADC | 12-bit, up to 20 channels, 350 ksps |
| DAC | 10-bit, 350 ksps |
| DMA Channels | 12 |
| Timers/Counters | 8 (TC) plus RTC |
| Nível MSL | 3 (168 hours) |
| Status RoHS | Compliant (Pb-free, GREEN per supplier) |
Configuração de pinos do ATSAMD21J17A-AF
| Pino 1 | PA00 — GPIO / TCC2 WO[0] / SERCOM1 PAD[0] |
| Pino 2 | PA01 — GPIO / TCC2 WO[1] / SERCOM1 PAD[1] |
| Pino 3 | PA02 — GPIO / ADC AIN[0] / DAC VOUT |
| Pino 4 | PA03 — GPIO / ADC AIN[1] / VREFA |
| Pino 5 | GND — Ground |
| Pino 6 | VDDIN — Voltage regulator input supply |
| Pino 7 | VDDIO — I/O supply voltage |
| Pino 8 | PA04 — GPIO / VREFB / ADC AIN[4] |
| Pino 9 | PA05 — GPIO / ADC AIN[5] |
| Pino 10 | PA06 — GPIO / ADC AIN[6] |
| Pino 11 | PA07 — GPIO / ADC AIN[7] |
| Pino 12 | VDDANA — Analog supply voltage |
| Pino 13 | GND — Ground |
| Pino 14 | PA08 — GPIO / NMI / SERCOM0 PAD[0] |
| Pino 15 | PA09 — GPIO / SERCOM0 PAD[1] |
| Pino 16 | PA10 — GPIO / SERCOM0 PAD[2] |
| Pino 17 | PA11 — GPIO / SERCOM0 PAD[3] |
| Pino 18 | PA12 — GPIO / SERCOM2 PAD[0] |
| Pino 19 | PA13 — GPIO / SERCOM2 PAD[1] |
| Pino 20 | PA14 — GPIO / SERCOM2 PAD[2] |
| Pino 21 | PA15 — GPIO / SERCOM2 PAD[3] |
| Pino 22 | PA16 — GPIO / SERCOM1 PAD[0] / I2S SCK |
| Pino 23 | PA17 — GPIO / SERCOM1 PAD[1] / I2S FS |
| Pino 24 | PA18 — GPIO / SERCOM1 PAD[2] / I2S MCK |
| Pino 25 | PA19 — GPIO / SERCOM1 PAD[3] / I2S SDO |
| Pino 26 | PA20 — GPIO / SERCOM3 PAD[0] |
| Pino 27 | PA21 — GPIO / SERCOM3 PAD[1] |
| Pino 28 | PA22 — GPIO / SERCOM3 PAD[2] |
| Pino 29 | PA23 — GPIO / SERCOM3 PAD[3] / USB SOF 1kHz |
| Pino 30 | PA24 — GPIO / USB_DM |
| Pino 31 | PA25 — GPIO / USB_DP |
| Pino 32 | GND — Ground |
| Pino 33 | VDDIO — I/O supply voltage |
| Pino 34 | PA26 — GPIO / TCC1 WO[0] |
| Pino 35 | PA27 — GPIO / TCC1 WO[1] |
| Pino 36 | PA28 — GPIO / TCC1 WO[2] |
| Pino 37 | PA29 — GPIO / TCC1 WO[3] |
| Pino 38 | PA30 — GPIO / TCC2 WO[0] / SWDIO |
| Pino 39 | PA31 — GPIO / TCC2 WO[1] / SWCLK |
| Pino 40 | RESETn — Reset input, active low |
| Pino 41 | PB00 — GPIO / SERCOM5 PAD[2] |
| Pino 42 | PB01 — GPIO / SERCOM5 PAD[3] |
| Pino 43 | PB02 — GPIO / SERCOM5 PAD[0] |
| Pino 44 | PB03 — GPIO / SERCOM5 PAD[1] |
| Pino 45 | PB04 — GPIO / SERCOM4 PAD[0] |
| Pino 46 | PB05 — GPIO / SERCOM4 PAD[1] |
| Pino 47 | PB06 — GPIO / SERCOM4 PAD[2] |
| Pino 48 | PB07 — GPIO / SERCOM4 PAD[3] |
| Pino 49 | PB08 — GPIO / SERCOM4 PAD[0] alt |
| Pino 50 | PB09 — GPIO / SERCOM4 PAD[1] alt |
| Pino 51 | PB10 — GPIO / SERCOM4 PAD[2] alt |
| Pino 52 | PB11 — GPIO / SERCOM4 PAD[3] alt |
| Pino 53 | PB12 — GPIO / SERCOM4 PAD[0] |
| Pino 54 | PB13 — GPIO / SERCOM4 PAD[1] |
| Pino 55 | PB14 — GPIO / SERCOM4 PAD[2] |
| Pino 56 | PB15 — GPIO / SERCOM4 PAD[3] |
| Pino 57 | PB16 — GPIO / SERCOM5 PAD[0] |
| Pino 58 | PB17 — GPIO / SERCOM5 PAD[1] |
| Pino 59 | PB18 — GPIO / SERCOM5 PAD[2] |
| Pino 60 | PB19 — GPIO / SERCOM5 PAD[3] |
| Pino 61 | PB20 — GPIO / SERCOM3 PAD[0] alt |
| Pino 62 | PB21 — GPIO / SERCOM3 PAD[1] alt |
| Pino 63 | GND — Ground |
| Pino 64 | VDDIO — I/O supply voltage |
Aplicações típicas
ATSAMD21J17A-AF é adequado para 7 aplicaçãos: USB Human Interface Device (HID), Home Automation Gateway, Smart Metering and Data Logging, Industrial Control Panel HMI, Low-Power Wireless Sensor Node, Consumer Wearable Device, USB Composite Device (CDC + HID + MSC).
USB Human Interface Device (HID)
The ATSAMD21J17A-AF's integrated USB 2.0 Full-Speed device controller with on-chip transceiver makes it ideal for USB HID peripherals such as keyboards, mice, touch panels, and custom input devices. The 48 MHz Cortex-M0+ core easily handles 1 kHz HID polling with headroom for debounce, matrix scanning, and capacitive sensing processing. The on-chip PHY eliminates external USB components, reducing BOM cost and PCB area. Microchip's ASF USB stack provides ready-made HID class drivers, shortening time-to-market.
Recomendado
Home Automation Gateway
The ATSAMD21J17A-AF suits home automation gateways requiring USB host/device connectivity, multiple wireless protocol co-processors, and a wide operating voltage range. The six SERCOM modules can simultaneously interface an SPI LoRa or Sub-GHz radio, an I2C sensor hub, a UART GPS module, and a USART debug port. SleepWalking event-driven wakeup reduces standby current below 10 uA, allowing battery + mains hybrid designs. The 4 KB read-while-write EEPROM area stores persistent configuration across power cycles.
Recomendado
Smart Metering and Data Logging
The 4 KB read-while-write EEPROM area in the ATSAMD21J17A-AF is purpose-built for smart metering applications requiring non-volatile storage of consumption logs, calibration coefficients, and tamper events without external EEPROM. The 12-bit ADC with up to 20 channels handles direct interface to current shunts and voltage dividers, while the on-chip temperature sensor supports metering temperature compensation. Industrial -40C to +125C operation supports outdoor utility installations.
Recomendado
Industrial Control Panel HMI
The 52 GPIO pins exposed by the ATSAMD21J17A-AF in the 64-pin TQFP package support direct drive of 7-segment displays, status LEDs, key matrices, and rotary encoders typical in industrial control panels. The 12-bit ADC reads potentiometers and analog sensors, while the PWM timers drive indicator LED brightness or buzzer tones. Industrial temperature range -40C to +125C supports factory-floor deployment, and the integrated USB device interface simplifies firmware updates via service port.
Recomendado
Low-Power Wireless Sensor Node
Battery-powered wireless sensor nodes benefit from the ATSAMD21J17A-AF's SleepWalking architecture, which keeps the core asleep while peripherals monitor inputs and wake the CPU only on relevant events. Standby current under 10 uA enables multi-year coin-cell operation when paired with a Sub-GHz or BLE co-processor over SPI. The integrated 12-bit ADC and 10-bit DAC handle direct sensor interface without external signal conditioning. Wide 1.62-3.63 V supply tolerates battery voltage droop.
Recomendado
Consumer Wearable Device
The ATSAMD21J17A-AF suits compact consumer wearables such as fitness bands, smartwatches (as peripheral co-processor), and health monitors. Its low active current at 48 MHz, multiple SERCOM channels for BLE/SPO2/touch controllers, and integrated USB for charging and firmware updates make it a strong fit. The industrial temperature range supports wearable thermal variability, and the 10-bit DAC drives haptic feedback waveforms directly without external circuitry.
Recomendado
USB Composite Device (CDC + HID + MSC)
The ATSAMD21J17A-AF can enumerate as a composite USB device with multiple interfaces (for example CDC virtual COM port for debugging, HID for control, and MSC for bulk file transfer) using Microchip's composite device stack. The 128 KB Flash accommodates the larger USB stack plus application code, and 16 KB SRAM buffers bulk transfers efficiently. Industrial temperature operation suits outdoor or automotive service tools that rely on USB connectivity.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAMD21J17A-AF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAMD21J17B-AF | ATSAMD21J18A-AF | ATSAMD21J16B-AF | ATSAMC21J17A-AF | ATSAMD21G18A-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin TQFP (10x10 mm) | 64-pin TQFP (10x10 mm) - same | 64-pin TQFP (10x10 mm) - same | 64-pin TQFP (10x10 mm) - same | 64-pin TQFP (10x10 mm) - same | 48-pin QFN (7x7 mm) |
| Core Architecture | 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 | 256 KB | 64 KB | 128 KB | 256 KB |
| SRAM | 16 KB | 16 KB | 32 KB | 8 KB | 16 KB | 32 KB |
| Operating Voltage | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 2.7 V to 5.5 V | 1.62 V to 3.63 V |
| USB Interface | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device |
| CAN-FD Peripheral | No | No | No | No | Yes (CAN-FD) | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| GPIO Pins | 52 | 52 | 52 | 52 | 52 | 38 |
Principais diferenciais
- Integrated USB 2.0 Full-Speed device with on-chip PHY (vs ATSAMC21J17A-AF)
- Six SERCOM modules independently configurable as I2C/SPI/UART (vs ATSAMD21G18A-MU)
- 4 KB read-while-write EEPROM emulation in Flash (vs ATSAMD21J16B-AF)
Notas de projeto
Power-rail decoupling is critical for stable USB operation. Place a 1 uF X7R ceramic on each VDDIN pin, a 100 nF X7R on each VDDIO pin, and a 4.7 uF bulk capacitor on VDDANA. The integrated 1.2 V core LDO requires its own 1 uF capacitor on the VDDOUT pin. For USB Full-Speed, VDDIO must be at least 3.0 V to meet USB signal swing requirements. Place the bulk capacitor within 5 mm of the MCU to suppress inrush during USB enumeration.
Use a continuous ground plane under the TQFP package and stitch vias around the perimeter to reduce EMI and provide a low-impedance return path for high-speed signals. Keep USB D+ and D- traces as short as possible (under 25 mm), matched within 2 mm, and routed over a continuous ground plane. Avoid routing other signals under the MCU or across the USB differential pair. The 0.5 mm pitch TQFP pads can be hand-soldered with care but production designs should use a reflow profile per J-STD-020 with peak temperature of 245C to 250C for Pb-free assembly.
Two common pitfalls with the ATSAMD21J17A-AF: (1) Forgetting that the bootloader consumes ~8 KB of Flash - target applications requiring >120 KB code must use the J18 variant instead. (2) Mistakenly routing PA24/PA25 (USB D-/D+) as regular GPIO without disabling the USB controller - the on-chip pull-up on D+ can cause enumeration failures. Always explicitly configure USB or GPIO mode via the PORT group and check the bootloader fuses before locking the device with NVMCTRL.SECDB bit.
At maximum 48 MHz clock with all peripherals active and 3.63 V supply, the SAM D21 draws approximately 8 mA active current (~29 mW). The 64-pin TQFP package has theta_JA of approximately 39 C/W on a 4-layer JEDEC test board, so junction temperature rise is roughly 1.1 C above ambient - thermal management is rarely a concern for this MCU. However, in closed enclosures with no airflow, verify by measuring VDDANA during operation; values above 3.6 V at high ambient indicate the regulator is approaching dropout.
Informações de conformidade
RoHS compliant and Pb-free GREEN per supplier listings (DigiKey/Mouser). Industrial temperature range -40C to +125C. Not AEC-Q100 qualified - see ATSAMx21x E variants for automotive-grade equivalents.
