ATSAMD21J17A-AF - 48MHz Cortex-M0+ MCU, 128KB Flash, USB | Microchip
Teilenummer: ATSAMD21J17A-AF ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 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 Übersicht
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.
Drop-in-Alternativen für ATSAMD21J17A-AF – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ATSAMD21J17A-AF (gleiche Bauform und Footprint) – abweichend in ADC, Operating Temperature, Package, Flash Memory, DAC.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ATSAMD21J17B-AF
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATSAMD21J18A-AF
✅ Drop-In✓ Auf Lager
$2.99 / Stück
Datenblatt ansehen →ATSAMD21J16B-AF
✅ Drop-In✓ Auf Lager
$2.52 / Stück
Datenblatt ansehen →ATSAMC21J17A-AF
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATSAMD21G18A-MU
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$3.15 / Stück
Datenblatt ansehen →ATSAMD21J17A-AF Grenzwerte & elektrische Eigenschaften
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximale Taktfrequenz | 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 |
| Betriebstemperaturbereich | -40C to +125C (industrial) |
| Gehäuse | 64-pin TQFP (10x10 mm), 0.5 mm pitch |
| Montageart | 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 |
| MSL-Level | 3 (168 hours) |
| RoHS-Status | Compliant (Pb-free, GREEN per supplier) |
ATSAMD21J17A-AF Pin-Konfiguration
| Pin 1 | PA00 — GPIO / TCC2 WO[0] / SERCOM1 PAD[0] |
| Pin 2 | PA01 — GPIO / TCC2 WO[1] / SERCOM1 PAD[1] |
| Pin 3 | PA02 — GPIO / ADC AIN[0] / DAC VOUT |
| Pin 4 | PA03 — GPIO / ADC AIN[1] / VREFA |
| Pin 5 | GND — Ground |
| Pin 6 | VDDIN — Voltage regulator input supply |
| Pin 7 | VDDIO — I/O supply voltage |
| Pin 8 | PA04 — GPIO / VREFB / ADC AIN[4] |
| Pin 9 | PA05 — GPIO / ADC AIN[5] |
| Pin 10 | PA06 — GPIO / ADC AIN[6] |
| Pin 11 | PA07 — GPIO / ADC AIN[7] |
| Pin 12 | VDDANA — Analog supply voltage |
| Pin 13 | GND — Ground |
| Pin 14 | PA08 — GPIO / NMI / SERCOM0 PAD[0] |
| Pin 15 | PA09 — GPIO / SERCOM0 PAD[1] |
| Pin 16 | PA10 — GPIO / SERCOM0 PAD[2] |
| Pin 17 | PA11 — GPIO / SERCOM0 PAD[3] |
| Pin 18 | PA12 — GPIO / SERCOM2 PAD[0] |
| Pin 19 | PA13 — GPIO / SERCOM2 PAD[1] |
| Pin 20 | PA14 — GPIO / SERCOM2 PAD[2] |
| Pin 21 | PA15 — GPIO / SERCOM2 PAD[3] |
| Pin 22 | PA16 — GPIO / SERCOM1 PAD[0] / I2S SCK |
| Pin 23 | PA17 — GPIO / SERCOM1 PAD[1] / I2S FS |
| Pin 24 | PA18 — GPIO / SERCOM1 PAD[2] / I2S MCK |
| Pin 25 | PA19 — GPIO / SERCOM1 PAD[3] / I2S SDO |
| Pin 26 | PA20 — GPIO / SERCOM3 PAD[0] |
| Pin 27 | PA21 — GPIO / SERCOM3 PAD[1] |
| Pin 28 | PA22 — GPIO / SERCOM3 PAD[2] |
| Pin 29 | PA23 — GPIO / SERCOM3 PAD[3] / USB SOF 1kHz |
| Pin 30 | PA24 — GPIO / USB_DM |
| Pin 31 | PA25 — GPIO / USB_DP |
| Pin 32 | GND — Ground |
| Pin 33 | VDDIO — I/O supply voltage |
| Pin 34 | PA26 — GPIO / TCC1 WO[0] |
| Pin 35 | PA27 — GPIO / TCC1 WO[1] |
| Pin 36 | PA28 — GPIO / TCC1 WO[2] |
| Pin 37 | PA29 — GPIO / TCC1 WO[3] |
| Pin 38 | PA30 — GPIO / TCC2 WO[0] / SWDIO |
| Pin 39 | PA31 — GPIO / TCC2 WO[1] / SWCLK |
| Pin 40 | RESETn — Reset input, active low |
| Pin 41 | PB00 — GPIO / SERCOM5 PAD[2] |
| Pin 42 | PB01 — GPIO / SERCOM5 PAD[3] |
| Pin 43 | PB02 — GPIO / SERCOM5 PAD[0] |
| Pin 44 | PB03 — GPIO / SERCOM5 PAD[1] |
| Pin 45 | PB04 — GPIO / SERCOM4 PAD[0] |
| Pin 46 | PB05 — GPIO / SERCOM4 PAD[1] |
| Pin 47 | PB06 — GPIO / SERCOM4 PAD[2] |
| Pin 48 | PB07 — GPIO / SERCOM4 PAD[3] |
| Pin 49 | PB08 — GPIO / SERCOM4 PAD[0] alt |
| Pin 50 | PB09 — GPIO / SERCOM4 PAD[1] alt |
| Pin 51 | PB10 — GPIO / SERCOM4 PAD[2] alt |
| Pin 52 | PB11 — GPIO / SERCOM4 PAD[3] alt |
| Pin 53 | PB12 — GPIO / SERCOM4 PAD[0] |
| Pin 54 | PB13 — GPIO / SERCOM4 PAD[1] |
| Pin 55 | PB14 — GPIO / SERCOM4 PAD[2] |
| Pin 56 | PB15 — GPIO / SERCOM4 PAD[3] |
| Pin 57 | PB16 — GPIO / SERCOM5 PAD[0] |
| Pin 58 | PB17 — GPIO / SERCOM5 PAD[1] |
| Pin 59 | PB18 — GPIO / SERCOM5 PAD[2] |
| Pin 60 | PB19 — GPIO / SERCOM5 PAD[3] |
| Pin 61 | PB20 — GPIO / SERCOM3 PAD[0] alt |
| Pin 62 | PB21 — GPIO / SERCOM3 PAD[1] alt |
| Pin 63 | GND — Ground |
| Pin 64 | VDDIO — I/O supply voltage |
Typische Anwendungen
ATSAMD21J17A-AF ist geeignet für 7 Anwendungs: 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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ATSAMD21J17A-AF – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | 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 |
Wichtigste Unterscheidungsmerkmale
- 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)
Designhinweise
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.
Compliance-Informationen
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.
