ATSAMD21J16B-AFT - 64KB Flash ARM Cortex-M0+ MCU | Microchip
Référence : ATSAMD21J16B-AFT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.95 | $3,95 |
| 10 | $3.62 | $36,20 |
| 100 | $3.1 | $310,00 |
| 500 | $2.78 | $1 390,00 |
| 1 000 | $2.55 | $2 550,00 |
ATSAMD21J16B-AFT Présentation
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals such as timers, ADCs, communication interfaces, and GPIO. The Cortex-M0+ is ARM's smallest and most energy-efficient 32-bit core, designed for deterministic real-time embedded workloads at low cost. Within the broader hierarchy, an MCU sits below microprocessors (MPUs) and above digital signal controllers (DSCs); the SAM D21 line is Microchip's mainstream ARM-based MCU family replacing legacy AVR parts.
Key features include six SERCOM interfaces configurable as UART/SPI/I2C, one 12-bit 1 MSPS ADC with up to 20 channels, one 10-bit DAC, two analog comparators, up to 52 GPIO, and a full-speed USB 2.0 Device/Host with internal 3.3 V regulator. The Event System and DMAC enable peripheral-to-peripheral and memory-to-peripheral transfers without CPU intervention, freeing cycles for application logic.
The SAM D21J variant is a pin-compatible upgrade for older SAM D20 designs, adding USB and richer analog capability while keeping the same 64-pin TQFP footprint. Power modes include Idle, Standby, Backup, and SleepWalking peripherals that wake selectively on configured events, allowing deep sleep at single-digit microampere currents.
Typical applications include industrial sensor hubs, USB HID peripherals, home automation gateways, low-power IoT nodes, and Human-Machine Interface (HMI) panels. Drop-in compatibility with SAM D20J simplifies migration for legacy firmware while exposing USB and richer timers.
Designers should note that the suffix -AFT denotes 125C TQFP tape-and-reel packaging, while -AF is identical in tray. Ensure the 1.62 V minimum supply is respected for brown-out behavior and configure the SYSCTRL with the correct 8 MHz DFLL reference for full 48 MHz operation.
This page synthesizes distributor pricing, pin-compatible SAM D20J and SAM D21J alternatives, and practical design notes that complement the manufacturer datasheet for engineering selection.
Alternatives de remplacement direct pour ATSAMD21J16B-AFT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATSAMD21J16B-AFT (même facteur de forme et même empreinte) — différant par ADC, Mounting Type, Package, Core, Operating Temperature.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATSAMD21J17D-AFT
✅ Remplacement direct✓ En stock
$2.78 / unité
Voir la fiche technique →ATSAMD21J18A-AFT
✅ Remplacement direct✓ En stock
$2.71 / unité
Voir la fiche technique →ATSAMD21J15B-AFT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATSAMD20J18A-AU
✅ Remplacement direct✓ En stock
$2.15 / unité
Voir la fiche technique →ATSAMD21J16B-AFT Valeurs maximales et caractéristiques électriques
| Core | ARM Cortex-M0+ (32-bit, single core) |
| CPU Clock Speed | 48 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| SRAM | 8 KB |
| Boîtier | 64-TQFP (10x10 mm) |
| Operating Voltage | 1.62 V to 3.63 V |
| Typical Operating Voltage | 3.3 V |
| Number of I/O | 52 |
| Plage de température de fonctionnement | -40C to +125C |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
| ADC | 12-bit, 1 MSPS, up to 20 channels |
| DAC | 10-bit, 1 channel |
| Comparators | 2 analog comparators |
| Communication Interfaces | 6 SERCOM (UART/SPI/I2C), USB 2.0 FS Device/Host, I2S |
| DMA Channels | 12-channel DMAC + 12-channel Event System |
| Debug Interface | Two-pin Serial Wire Debug (SWD) |
Configuration des broches de ATSAMD21J16B-AFT
| Broche 1 | PA00 — GPIO / ADC input |
| Broche 2 | PA01 — GPIO / ADC input |
| Broche 3 | PA02 — GPIO / ADC / DAC output |
| Broche 4 | PA03 — GPIO / ADC / Reference voltage |
| Broche 5 | VDD — Digital supply voltage |
| Broche 6 | GND — Ground |
| Broche 7 | PA04 — GPIO / ADC / VDIV |
| Broche 8 | PA05 — GPIO / ADC |
| Broche 9 | PA06 — GPIO / ADC |
| Broche 10 | PA07 — GPIO / ADC |
| Broche 11 | VDDIO — I/O supply voltage |
| Broche 12 | GND — Ground |
| Broche 13 | PA08 — GPIO / NMI / ADC |
| Broche 14 | PA09 — GPIO / I2S / SERCOM |
| Broche 15 | PA10 — GPIO / SERCOM |
| Broche 16 | PA11 — GPIO / SERCOM |
| Broche 17 | PA12 — GPIO / SERCOM / COSC |
| Broche 18 | PA13 — GPIO / SERCOM |
| Broche 19 | PA14 — GPIO / SERCOM / XCLK |
| Broche 20 | PA15 — GPIO / SERCOM |
| Broche 21 | PA16 — GPIO / SERCOM / I2S |
| Broche 22 | PA17 — GPIO / SERCOM / SDO |
| Broche 23 | PA18 — GPIO / SERCOM |
| Broche 24 | PA19 — GPIO / SERCOM |
| Broche 25 | PA20 — GPIO / SERCOM |
| Broche 26 | PA21 — GPIO / SERCOM |
| Broche 27 | PA22 — GPIO / SERCOM |
| Broche 28 | PA23 — GPIO / SERCOM / USB SOF |
| Broche 29 | PA24 — GPIO / USB D- |
| Broche 30 | PA25 — GPIO / USB D+ |
| Broche 31 | GND — Ground |
| Broche 32 | VDD — Digital supply voltage |
| Broche 33 | PA26 — GPIO / SDC |
| Broche 34 | PA27 — GPIO / SDC |
| Broche 35 | PA28 — GPIO / Reset input |
| Broche 36 | PA29 — GPIO / SWD IO |
| Broche 37 | PA30 — GPIO / SWD CLK |
| Broche 38 | PA31 — GPIO |
| Broche 39 | PB00 — GPIO |
| Broche 40 | PB01 — GPIO |
| Broche 41 | PB02 — GPIO / SERCOM |
| Broche 42 | PB03 — GPIO / SERCOM |
| Broche 43 | PB04 — GPIO / SERCOM |
| Broche 44 | PB05 — GPIO / SERCOM |
| Broche 45 | PB06 — GPIO / SERCOM |
| Broche 46 | PB07 — GPIO / SERCOM |
| Broche 47 | PB08 — GPIO / SERCOM / I2S |
| Broche 48 | PB09 — GPIO / SERCOM / I2S |
| Broche 49 | PB10 — GPIO / SERCOM |
| Broche 50 | PB11 — GPIO / SERCOM |
| Broche 51 | PB12 — GPIO / SERCOM |
| Broche 52 | PB13 — GPIO / SERCOM |
| Broche 53 | PB14 — GPIO / SERCOM |
| Broche 54 | PB15 — GPIO / SERCOM |
| Broche 55 | PB16 — GPIO / SERCOM |
| Broche 56 | PB17 — GPIO / SERCOM / I2S MCLK |
| Broche 57 | PB18 — GPIO / TC |
| Broche 58 | PB19 — GPIO / TC |
| Broche 59 | PB20 — GPIO / TC |
| Broche 60 | PB21 — GPIO / TC |
| Broche 61 | VDD — Digital supply voltage |
| Broche 62 | GND — Ground |
| Broche 63 | VDDIO — I/O supply voltage |
| Broche 64 | GND — Ground |
Applications typiques
ATSAMD21J16B-AFT convient pour 6 applications: Industrial Sensor Hub, USB HID Peripheral, Home Automation Gateway, Low-Power IoT Sensor Node, HMI Control Panel, Wearable Fitness Device.
Industrial Sensor Hub
The ATSAMD21J16B-AFT fits industrial sensor hubs because it combines 48 MHz ARM Cortex-M0+ processing with 6 SERCOM channels and a 12-bit 1 MSPS ADC capable of sampling up to 20 analog inputs in parallel. Its -40C to +125C operating range and 64 KB Flash allow full Modbus RTU or IO-Link stack integration with local DSP filtering on a single chip. The 12-channel DMAC autonomously streams ADC samples into SRAM, leaving the CPU free for higher-level protocol work. Compared with discrete ADC + MCU two-chip solutions, the integrated ADC and SERCOM reduce BOM by 30% and shrink PCB area. SleepWalking peripherals also let unused analog front-ends stay asleep until threshold events, holding quiescent current under 5 uA.
Recommandé
USB HID Peripheral
The ATSAMD21J16B-AFT is well-suited for USB Human Interface Devices because it integrates a full-speed USB 2.0 Device/Host controller with on-chip pull-up and an internal 3.3 V regulator, eliminating an external LDO. Its 48 MHz Cortex-M0+ handles HID report generation, debouncing, and LED animations without offloading. Six SERCOM channels remain available for N-key rollover keyboards, custom HID-class joysticks, or game controllers needing auxiliary SPI/I2C sensors. The 64 KB Flash holds the USB stack and HID report descriptor with room for vendor-specific commands. Drop-in compatibility with SAM D21J allows the same PCB to scale between J15 (32 KB), J16 (64 KB), and J18 (256 KB) without layout change.
Recommandé
Home Automation Gateway
The ATSAMD21J16B-AFT powers cost-optimized home automation gateways thanks to its Cortex-M0+ core at 48 MHz and 6 SERCOM interfaces that concurrently handle RS-485, SPI flash, I2C sensors, and a UART console. The 12-channel Event System wires GPIO interrupts directly to timers and SERCOM without CPU round-trip latency, ensuring deterministic response to PIR motion or push-button events. The integrated 10-bit DAC can synthesize local voice prompts or test tones. With 64 KB Flash it runs Thread/Zigbee host stub or Matter-over-WiFi co-processor glue logic. Industrial temperature grade ensures reliability in unattended installations.
Recommandé
Low-Power IoT Sensor Node
The ATSAMD21J16B-AFT is ideal for battery-powered IoT sensor nodes thanks to its SleepWalking peripherals and deep standby current under 5 uA with full SRAM retention. The Cortex-M0+ core at 48 MHz executes LoRaWAN/Sigfox stacks and AES-128 crypto acceleration, while 64 KB Flash fits the full network stack plus application code. Six SERCOM interfaces concurrently drive SPI sensors, I2C peripherals, and a UART debug console. Wake-up time from standby to active mode is under 5 us, minimizing energy spent on listening. Industrial -40C to +125C temperature grade enables outdoor deployments.
Recommandé
HMI Control Panel
The ATSAMD21J16B-AFT drives Human-Machine Interface panels because its 12-bit 1 MSPS ADC reads multiple rotary encoders, sliders, and 4-wire resistive touchscreens simultaneously, while the 10-bit DAC generates beep tones and contrast voltages. With 52 GPIO the device connects directly to character/graphic LCDs without external glue logic. The Cortex-M0+ runs a small RTOS or event-driven UI loop with sub-50 us response latency. Six SERCOM interfaces drive RGB LED backlights and I2C GPIO expanders for keypad scanning. Industrial temperature and 64 KB Flash sustain long product lifetimes with field-updatable firmware.
Recommandé
Wearable Fitness Device
The ATSAMD21J16B-AFT suits wearable fitness bands and watches thanks to its 64-pin TQFP package, low standby current, and rich analog front-end for heart-rate and motion sensing. The 12-bit ADC reads photoplethysmography (PPG) signals at 1 MSPS while the SERCOM-based I2C drives accelerometers, gyros, and BLE companions. The Cortex-M0+ at 48 MHz processes sensor-fusion algorithms in real time, and 64 KB Flash holds custom BLE profiles plus DSP firmware. With SleepWalking peripherals, only the BLE module wakes the MCU on connection events. The 64-pin TQFP keeps the PCB compact for wrist-worn form factors.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATSAMD21J16B-AFT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATSAMD21J17D-AFT | ATSAMD21J18A-AFT | ATSAMD21J15B-AFT | ATSAMD20J18A-AU | ATSAMD21G18A-AFT |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP - same | 48-TQFP - smaller |
| 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 | 64 KB | 128 KB | 256 KB | 32 KB | 256 KB | 256 KB |
| SRAM | 8 KB | 16 KB | 32 KB | 4 KB | 32 KB | 32 KB |
| Number of I/O | 52 | 52 | 52 | 52 | 52 | 38 |
| USB | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | No USB | USB 2.0 FS Device/Host |
| 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 | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +125C |
Principaux différenciateurs
- Full-speed USB 2.0 with on-chip pull-up and internal regulator (vs ATSAMD20J18A-AU)
- Higher GPIO count (52) on a single TQFP-64 footprint (vs ATSAMD21G18A-AFT)
- Industrial -40C to +125C operating temperature range (vs ATSAMD20J18A-AU)
Notes de conception
The ATSAMD21J16B-AFT supports four power profiles - Active, Idle, Standby, and Backup. To minimize current in battery-powered designs, switch unused analog blocks (ADC, DAC, comparators) off via the APBCMASK register before entering standby. The internal 3.3V regulator has a soft-start sequence; apply VDDIO and VDDIN within 10ms of each other to avoid brown-out. Decoupling: place 100nF X7R + 4.7uF X5R on each VDD pin, kept within 3mm of the pad. The VDDIO and VDDIN may be tied together for 3.3V-only operation.
Route the SWD signals (SWDIO/PA29, SWDCLK/PA30) as a 2-wire shielded pair with ground guard vias, keeping total length under 50mm. The 32 kHz crystal (XIN32/XOUT32) requires a guard ring with isolated ground to keep noise out of the low-power oscillator. If USB is used, route DP (PA25) and DM (PA24) as a 90-ohm differential pair with reference ground plane on layer 2. Place the USB decoupling 100nF + 4.7uF within 5mm of the USB VBUS pin.
Avoid the ATSAMD21J16A-AFT (revision A) - it is no longer recommended for new designs due to errata fixed in revision B. Use only -B suffix parts (J16B, J15B, J18B). When migrating from SAM D20 to SAM D21, note that the SERCOM pin multiplexing has subtle differences - re-validate your pin map against the SAMD21 pinout table. Do not exceed 8 mA per GPIO pin or 50 mA total per port to avoid long-term reliability degradation. Finally, ensure the BOOTPROT fuse is configured before locking Flash for production.
Informations de conformité
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - the -AFT variant is industrial-grade, not automotive. Contact Microchip for AEC-Q100 SAMD21J variants if automotive is required.
