ATSAMD21J16B-AF - 48MHz Cortex-M0+ MCU, 64KB Flash | Microchip
MPN: ATSAMD21J16B-AF ✓ Hoạt độngATSAMD21J16B-AF Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J16B-AF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATSAMD21J16B-AF (cùng hình factor và footprint) — khác nhau ở Package, ADC, Operating Temperature, RoHS Status, Core.
ATSAMD21J16B-AFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J15B-AUT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21G18A-AF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21G17A-AF
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21E16B-AF
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21G15B-AF
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21J16B-AF Tỷ lệ tối đa & tính chất điện
| 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) |
| Nhiệt độ hoạt động | -40C to +125C (industrial) |
| Hộp | 64-pin TQFP (10x10 mm) |
| Kiểu lắp đặt | 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) |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATSAMD21J16B-AF
| Chân 1 | PA03 — GPIO/AIN[1]/VREFA |
| Chân 2 | PA04 — GPIO/AIN[2]/VREFB |
| Chân 3 | PA05 — GPIO/AIN[3] |
| Chân 4 | PA06 — GPIO/AIN[4] |
| Chân 5 | PA07 — GPIO/AIN[5] |
| Chân 6 | PA08 — GPIO/NMI |
| Chân 7 | PA09 — GPIO |
| Chân 8 | PA10 — GPIO |
| Chân 9 | PA11 — GPIO |
| Chân 10 | VDDIO — I/O supply |
| Chân 11 | GND — Ground |
| Chân 12 | PA12 — GPIO |
| Chân 13 | PA13 — GPIO |
| Chân 14 | PA14 — GPIO/XIN |
| Chân 15 | PA15 — GPIO/XOUT |
| Chân 16 | PA16 — GPIO |
| Chân 17 | PA17 — GPIO |
| Chân 18 | PA18 — GPIO |
| Chân 19 | PA19 — GPIO |
| Chân 20 | PA20 — GPIO |
| Chân 21 | PA21 — GPIO |
| Chân 22 | PA22 — GPIO |
| Chân 23 | PA23 — GPIO |
| Chân 24 | PA24 — GPIO/USB_DM |
| Chân 25 | PA25 — GPIO/USB_DP |
| Chân 26 | PA27 — GPIO |
| Chân 27 | PA28 — GPIO |
| Chân 28 | PA29 — GPIO |
| Chân 29 | PA30 — GPIO/SWCLK |
| Chân 30 | PA31 — GPIO/SWDIO |
| Chân 31 | PB00 — GPIO |
| Chân 32 | PB01 — GPIO |
| Chân 33 | PB02 — GPIO/AIN[10] |
| Chân 34 | PB03 — GPIO/AIN[11] |
| Chân 35 | PB04 — GPIO/AIN[12] |
| Chân 36 | PB05 — GPIO/AIN[13] |
| Chân 37 | PB06 — GPIO/AIN[14] |
| Chân 38 | PB07 — GPIO/AIN[15] |
| Chân 39 | PB08 — GPIO/AIN[16] |
| Chân 40 | PB09 — GPIO/AIN[17] |
| Chân 41 | PB10 — GPIO/AIN[18] |
| Chân 42 | PB11 — GPIO/AIN[19] |
| Chân 43 | PB12 — GPIO |
| Chân 44 | PB13 — GPIO |
| Chân 45 | PB14 — GPIO |
| Chân 46 | PB15 — GPIO |
| Chân 47 | PB16 — GPIO |
| Chân 48 | PB17 — GPIO |
| Chân 49 | PB18 — GPIO |
| Chân 50 | PB19 — GPIO |
| Chân 51 | PB20 — GPIO |
| Chân 52 | PB21 — GPIO |
| Chân 53 | PB22 — GPIO |
| Chân 54 | PB23 — GPIO |
| Chân 55 | PB24 — GPIO |
| Chân 56 | PB25 — GPIO |
| Chân 57 | PB26 — GPIO |
| Chân 58 | PB27 — GPIO |
| Chân 59 | PB28 — GPIO |
| Chân 60 | PB29 — GPIO |
| Chân 61 | PB30 — GPIO |
| Chân 62 | PB31 — GPIO |
| Chân 63 | VDDIO — I/O supply |
| Chân 64 | GND — Ground |
Ứng dụng tiêu biểu
ATSAMD21J16B-AF phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J16B-AF — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Maximum analog channel count in SAM D21 family (vsATSAMD21G18A-AF)
- Best balance of Flash density and pin count (vsATSAMD21J15B-AUT)
- Drop-in silicon revision with corrected errata (vsATSAMD21J16A-AF)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
