ATSAMD21J16B-AF - 48MHz Cortex-M0+ MCU, 64KB Flash | Microchip
N.º da peça: ATSAMD21J16B-AF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.95 | $1.475,00 |
| 1.000 | $2.52 | $2.520,00 |
ATSAMD21J16B-AF Visão geral
A microcontroller (MCU) is an integrated circuit that combines a CPU core, memory, and programmable peripherals into a single chip. Within the embedded systems hierarchy, an MCU sits between a microprocessor (which requires external memory) and a system-on-chip (which integrates higher-level application processors). The Cortex-M0+ core places this MCU in the entry-level 32-bit tier, optimized for deterministic interrupt response, low active current, and aggressive sleep modes for battery-powered designs.
Key features of the ATSAMD21J16B-AF include a single-cycle hardware multiplier, a Micro Trace Buffer for lightweight instruction trace, six Serial Communication Interfaces (SERCOM) configurable as UART/SPI/I2C, a 12-channel DMA controller and 12-channel Event System for peripheral-to-peripheral signaling, plus full-speed USB 2.0 device/host support. Advanced peripherals include a 12-bit 350 ksps ADC with up to 20 channels, a 10-bit 350 ksps DAC, two analog comparators, and a 24-bit Timer/Counter for Control (TCC). The device also supports capacitive touch via the Peripheral Touch Controller (PTC).
The SAM D21 architecture integrates a 48 MHz Digital Frequency Locked Loop (DFLL48M) and a 48 MHz to 96 MHz Fractional Digital Phase-Locked Loop (FDPLL96M) on-chip, eliminating the need for an external crystal in many designs. A two-pin Serial Wire Debug (SWD) interface handles programming and test, and the part is drop-in compatible with the SAM D20 family for easy migration.
Typical applications include IoT sensor nodes, consumer wearables, industrial HMI panels, USB human-interface devices, capacitive-touch user interfaces, and low-power wireless sensor hubs. Its combination of 64KB Flash and SERCOM flexibility makes it well-suited to protocols like BLE co-processor interfaces, LoRa command shells, and CAN bus nodes through external transceivers.
When designing with this device, provide a 1uF and 0.1uF decoupling pair close to VDDCORE and VDDIO, follow the recommended 32.768 kHz crystal layout for RTC accuracy, and ensure the SWD reset circuit allows both programming and application reset. AEC-Q100 qualification (where applicable via the -AF variant) makes the part attractive for automotive body and chassis ECUs.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same SAM D21 family, and practical design notes that complement the manufacturer datasheet.
Alternativas drop-in para ATSAMD21J16B-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 ATSAMD21J16B-AF (mesmo formato e footprint) — diferindo em Package, ADC, Operating Temperature, RoHS Status, Core.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAMD21J16B-AFT
✅ Drop-In✓ Em estoque
$2.55 / unidade
Ver ficha técnica →ATSAMD21J15B-AUT
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.4 / unidade
Ver ficha técnica →ATSAMD21G18A-AF
✅ Drop-In✓ Em estoque
$3.49 / unidade
Ver ficha técnica →ATSAMD21G17A-AF
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.15 / unidade
Ver ficha técnica →ATSAMD21E16B-AF
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.19 / unidade
Ver ficha técnica →ATSAMD21G15B-AF
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.78 / unidade
Ver ficha técnica →ATSAMD21J16B-AF Classificações máximas e características elétricas
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| CoreMark/MHz | 2.46 |
| Flash Memory | 64 KB |
| SRAM | 8 KB |
| Supply Voltage (VDDIO) | 1.62 V to 3.63 V (3.3 V typical) |
| Temperatura de operação | -40C to +125C (industrial) |
| Encapsulamento | 64-pin TQFP (10x10 mm) |
| Tipo de montagem | Surface Mount |
| ADC | 12-bit, up to 20 channels, 350 ksps |
| DAC | 10-bit, 350 ksps |
| Analog Comparators | 2 |
| SERCOM Modules | 6 (configurable UART/SPI/I2C) |
| USB | USB 2.0 Full-Speed Device/Host |
| DMA Channels | 12 |
| Event System Channels | 12 |
| Debug Interface | 2-pin Serial Wire Debug (SWD) |
| Status RoHS | Compliant |
Configuração de pinos do ATSAMD21J16B-AF
| Pino 1 | PA03 — GPIO/AIN[1]/VREFA |
| Pino 2 | PA04 — GPIO/AIN[2]/VREFB |
| Pino 3 | PA05 — GPIO/AIN[3] |
| Pino 4 | PA06 — GPIO/AIN[4] |
| Pino 5 | PA07 — GPIO/AIN[5] |
| Pino 6 | PA08 — GPIO/NMI |
| Pino 7 | PA09 — GPIO |
| Pino 8 | PA10 — GPIO |
| Pino 9 | PA11 — GPIO |
| Pino 10 | VDDIO — I/O supply |
| Pino 11 | GND — Ground |
| Pino 12 | PA12 — GPIO |
| Pino 13 | PA13 — GPIO |
| Pino 14 | PA14 — GPIO/XIN |
| Pino 15 | PA15 — GPIO/XOUT |
| Pino 16 | PA16 — GPIO |
| Pino 17 | PA17 — GPIO |
| Pino 18 | PA18 — GPIO |
| Pino 19 | PA19 — GPIO |
| Pino 20 | PA20 — GPIO |
| Pino 21 | PA21 — GPIO |
| Pino 22 | PA22 — GPIO |
| Pino 23 | PA23 — GPIO |
| Pino 24 | PA24 — GPIO/USB_DM |
| Pino 25 | PA25 — GPIO/USB_DP |
| Pino 26 | PA27 — GPIO |
| Pino 27 | PA28 — GPIO |
| Pino 28 | PA29 — GPIO |
| Pino 29 | PA30 — GPIO/SWCLK |
| Pino 30 | PA31 — GPIO/SWDIO |
| Pino 31 | PB00 — GPIO |
| Pino 32 | PB01 — GPIO |
| Pino 33 | PB02 — GPIO/AIN[10] |
| Pino 34 | PB03 — GPIO/AIN[11] |
| Pino 35 | PB04 — GPIO/AIN[12] |
| Pino 36 | PB05 — GPIO/AIN[13] |
| Pino 37 | PB06 — GPIO/AIN[14] |
| Pino 38 | PB07 — GPIO/AIN[15] |
| Pino 39 | PB08 — GPIO/AIN[16] |
| Pino 40 | PB09 — GPIO/AIN[17] |
| Pino 41 | PB10 — GPIO/AIN[18] |
| Pino 42 | PB11 — GPIO/AIN[19] |
| Pino 43 | PB12 — GPIO |
| Pino 44 | PB13 — GPIO |
| Pino 45 | PB14 — GPIO |
| Pino 46 | PB15 — GPIO |
| Pino 47 | PB16 — GPIO |
| Pino 48 | PB17 — GPIO |
| Pino 49 | PB18 — GPIO |
| Pino 50 | PB19 — GPIO |
| Pino 51 | PB20 — GPIO |
| Pino 52 | PB21 — GPIO |
| Pino 53 | PB22 — GPIO |
| Pino 54 | PB23 — GPIO |
| Pino 55 | PB24 — GPIO |
| Pino 56 | PB25 — GPIO |
| Pino 57 | PB26 — GPIO |
| Pino 58 | PB27 — GPIO |
| Pino 59 | PB28 — GPIO |
| Pino 60 | PB29 — GPIO |
| Pino 61 | PB30 — GPIO |
| Pino 62 | PB31 — GPIO |
| Pino 63 | VDDIO — I/O supply |
| Pino 64 | GND — Ground |
Aplicações típicas
ATSAMD21J16B-AF é adequado para 6 aplicaçãos: IoT Sensor Nodes and Edge Devices, USB Human-Interface Devices, Capacitive Touch User Interfaces, Industrial Control and HMI Panels, Consumer Wearables and Fitness Devices, Battery Charging and Power Management Hosts.
IoT Sensor Nodes and Edge Devices
The ATSAMD21J16B-AF is an excellent fit for IoT sensor nodes thanks to its ARM Cortex-M0+ core at 48 MHz, 6 flexible SERCOM channels, and 12-bit ADC with up to 20 channels. Its idle current under 10 uA/MHz and sub-5 uA standby with RTC active let designs run for years on a coin cell. The 64KB Flash accommodates BLE or LoRaWAN stacks via a coprocessor over UART/SPI, and the Event System lets the ADC wake the MCU without CPU intervention. With the 12-channel DMA, sensor reads run autonomously, freeing the core for protocol logic and edge filtering.
Recomendado
USB Human-Interface Devices
The ATSAMD21J16B-AF integrates USB 2.0 Full-Speed Device/Host with on-chip DFLL48M, eliminating the external 12 MHz crystal required by most USB microcontrollers. Its 48 MHz Cortex-M0+ core runs HID class drivers comfortably, and the 6 SERCOM channels let you expose keyboard, mouse, consumer-control, and vendor interfaces concurrently. The 64KB Flash fits USB stacks plus HID report logic, while 8KB SRAM handles double-buffered HID reports. On-chip 5V-tolerant GPIOs simplify direct connection to USB connectors without level shifters.
Recomendado
Capacitive Touch User Interfaces
The ATSAMD21J16B-AF includes the Peripheral Touch Controller (PTC) supporting buttons, sliders, and wheels with up to 256 channels via the Y-lines. Combined with the 12-bit ADC for moisture compensation and the Event System for low-power wake-on-touch, the part delivers a robust touch UI in wearable, appliance, and industrial control panels. The 64KB Flash holds touch libraries and graphics rendering for small TFTs, while 8KB SRAM is sufficient for button debouncing and slider gesture state machines.
Recomendado
Industrial Control and HMI Panels
With AEC-Q100 Grade 1 qualification and -40C to +125C operation, the ATSAMD21J16B-AF suits industrial HMI panels, sensor transmitters, and small PLCs. Its 6 SERCOM channels drive RS-485, RS-232, SPI displays, and I2C sensors simultaneously, while the 12-channel DMA offloads repetitive communication tasks. The 12-bit ADC with 20 channels reads multiple analog sensors, and the 10-bit DAC outputs analog control signals. Hardware crypto acceleration through the on-chip AES peripheral secures field-bus traffic.
Recomendado
Consumer Wearables and Fitness Devices
The ATSAMD21J16B-AF powers wristband fitness trackers, heart-rate monitors, and BLE beacons thanks to its low active current, deep sleep modes, and integrated touch and ADC peripherals. The Cortex-M0+ runs sensor-fusion and BLE command shells while consuming under 7 mA active. The 64KB Flash holds BLE stacks and firmware update bootloaders, and the Event System lets an accelerometer interrupt wake the MCU directly. The 8KB SRAM buffers sensor samples before BLE transmission, extending battery life.
Recomendado
Battery Charging and Power Management Hosts
The ATSAMD21J16B-AF serves as the host controller in smart battery chargers, power banks, and energy-harvesting nodes. Its 12-bit ADC monitors cell voltage and current with hardware averaging, the 10-bit DAC drives constant-current references, and the 6 SERCOMs talk to I2C fuel gauges and SPI displays. Low-power sleep modes let the device idle while a load is absent, while RTC calendar tracks time-of-day charging profiles. The 64KB Flash fits state-machine firmware and battery-protocol stacks.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAMD21J16B-AF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAMD21J16B-AFT | ATSAMD21J15B-AUT | ATSAMD21G18A-AF | ATSAMD21G17A-AF | ATSAMD21E16B-AF | ATSAMD21G15B-AF |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 48-TQFP | 48-TQFP | 32-TQFP | 48-TQFP |
| Core | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ |
| Max Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 64 KB | 64 KB | 32 KB | 256 KB | 128 KB | 64 KB | 32 KB |
| SRAM | 8 KB | 8 KB | 4 KB | 32 KB | 16 KB | 8 KB | 4 KB |
| SERCOM Channels | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Principais diferenciais
- Maximum analog channel count in SAM D21 family (vs ATSAMD21G18A-AF)
- Best balance of Flash density and pin count (vs ATSAMD21J15B-AUT)
- Drop-in silicon revision with corrected errata (vs ATSAMD21J16A-AF)
Notas de projeto
Decouple VDDCORE with a 1uF X7R ceramic plus a 100nF X7R placed within 2 mm of the pin. VDDIO requires its own 100nF plus a bulk 1uF. Place the bulk capacitor on the same side of the PCB as the MCU, with vias to a ground island directly under the exposed pad. For USB-powered designs, add a 4.7uF bulk on VBUS to ride out inrush events. The on-chip voltage regulator needs no external inductor.
Route the 32.768 kHz crystal traces symmetrically and within 5 mm of the XIN/XOUT pins. Keep high-frequency digital traces (USB DP/DM, SWD) at least 3 mm away from the crystal. The USB differential pair must be 90 ohm impedance-controlled with no stubs, and the SWD pins should be brought to a 10-pin Cortex Debug header for production programming. The exposed thermal pad is not present on TQFP-64 but is on QFN variants - check the specific package.
Do not leave the RESET line floating - pull it up to VDDIO through a 10 kohm resistor with a 1 nF to 100 nF capacitor for noise rejection. Configure the NMI pin at startup so it is not driven by an external source inadvertently. When using the on-chip DFLL48M for USB, calibrate against the internal 48 MHz oscillator after each cold-boot. Last: confirm BOOTPROT fuse settings before locking the part, or you may brick production units.
Informações de conformidade
RoHS and REACH compliant per Microchip product page. AEC-Q100 Grade 1 qualified for automotive applications. Lead-free and halogen-free per Microchip environmental certification.
