ATSAMD20J14B-AU - 48MHz ARM Cortex-M0+ MCU, 16KB Flash | Microchip
MPN: ATSAMD20J14B-AU ✓ Hoạt độngATSAMD20J14B-AU Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and peripheral interfaces into one package. MCUs form the lowest tier of embedded computing, sitting below microprocessors and above simple logic ICs in the system-on-chip hierarchy. Within the Cortex family, M0+ is the smallest, lowest-power ARM core; it targets deterministic, energy-efficient real-time tasks such as sensor fusion, motor timing, and human-machine interface (HMI) glue logic. The SAM D20 family was Microchip's first Cortex-M0+ entry and remains popular for cost-sensitive, low-power designs.
Key features include 6 configurable SERCOM channels (each usable as UART, SPI, or I2C), a 12-channel 350 ksps 12-bit ADC, a 10-bit 350 ksps DAC, two analog comparators, a 24-bit RTC, and full-speed USB 2.0 device with on-chip transceiver. The device includes 38 GPIO, the Peripheral Touch Controller (PTC) supporting buttons, sliders, and wheels, and supports Sleep, Idle, and Standby modes consuming less than 5 uA in Standby.
The ATSAMD20J14B-AU uses a single-cycle hardware multiplier, a nested vector interrupt controller (NVIC) with 32 channels, and Microchip's Event System for inter-peripheral signalling without CPU wake-up. The integrated USB 2.0 Full-Speed device, 1 KB endpoint RAM, and on-chip pull-ups eliminate external PHY components, reducing BOM and board area. The 1.62 V minimum supply allows single-cell Li-ion or 2x AA alkaline operation.
Typical applications include home automation nodes, smart metering endpoints, consumer HMI, industrial sensor interfaces, and USB HID peripherals. The PTC and DAC combination also makes the part well-suited to capacitive touch panels and small audio-tone generators. For wireless sensor nodes, the low-power Sleep modes combined with the RTC enable multi-year battery life on coin cells.
When designing with this MCU, ensure the 64-TQFP footprint is selected for the 'J' (64-pin) variant - the 48-pin 'G' and 32-pin 'E' variants differ in pinout and peripheral count. Decouple VDDIN, VDDIO, and VDDCORE each with at least 100 nF plus 4.7 uF bulk, and tie the exposed pad (if present) to a solid ground pour for thermal relief.
This page synthesizes distributor pricing, drop-in alternatives within the SAM D20 family, and practical design notes not found in the bare datasheet, giving engineers a single decision-ready reference.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD20J14B-AU — 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 ATSAMD20J14B-AU (cùng hình factor và footprint) — khác nhau ở ADC, Mounting Type, Package, RoHS Status, Core Architecture.
ATSAMD20J14A-AUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD20J14A-CNT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD20J15A-AU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD20J16A-AU
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD20J18A-AU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD20J14B-AUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD20J14B-AU Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Core Subseries | SAM D20 |
| Maximum Clock Speed | 48 MHz |
| Program Memory (Flash) | 16 KB (16K x 8) |
| Data Memory (SRAM) | 2 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| Hộp | 64-pin TQFP (10x10 mm) |
| Temperature Grade | Industrial (-40C to +85C) |
| GPIO Count | 38 |
| SERCOM Channels | 6 (each configurable as UART/SPI/I2C) |
| ADC | 12-bit, 12 channels, 350 ksps |
| DAC | 10-bit, 1 channel, 350 ksps |
| Analog Comparators | 2 |
| USB | USB 2.0 Full-Speed Device with on-chip transceiver |
| Peripheral Touch Controller (PTC) | Yes (buttons, sliders, wheels) |
| RTC | 24-bit, with calendar mode |
| DMA Channels | 12 |
| Trạng thái RoHS | Compliant (Pb-free TQFP) |
| Kiểu lắp đặt | Surface Mount (TQFP, gull-wing) |
Cấu hình chân ATSAMD20J14B-AU
| Chân 1 | PA00 — GPIO / XIN (external clock input) |
| Chân 2 | PA01 — GPIO / XOUT (external clock output) |
| Chân 3 | PA02 — GPIO / AIN0 (analog input) |
| Chân 4 | PA03 — GPIO / AIN1 / VREFA / ADC reference |
| Chân 5 | GND — Ground |
| Chân 6 | VDDIO — Digital I/O supply (1.62-3.63 V) |
| Chân 7 | PA04 — GPIO / AIN2 / DAC / VREFB |
| Chân 8 | PA05 — GPIO / AIN3 |
| Chân 9 | PA06 — GPIO / AIN4 |
| Chân 10 | PA07 — GPIO / AIN5 |
| Chân 11 | VDDIN — Main supply input (1.62-3.63 V) |
| Chân 12 | GND — Ground |
| Chân 13 | PA08 — GPIO / AIN6 / SERCOM0 PAD0 |
| Chân 14 | PA09 — GPIO / AIN7 / SERCOM0 PAD1 |
| Chân 15 | PA10 — GPIO / AIN8 / SERCOM0 PAD2 |
| Chân 16 | PA11 — GPIO / AIN9 / SERCOM0 PAD3 |
| Chân 17 | PA12 — GPIO / SERCOM2 PAD0 |
| Chân 18 | PA13 — GPIO / SERCOM2 PAD1 |
| Chân 19 | PA14 — GPIO / SERCOM2 PAD2 |
| Chân 20 | PA15 — GPIO / SERCOM2 PAD3 |
| Chân 21 | PA16 — GPIO / SERCOM1 PAD0 |
| Chân 22 | PA17 — GPIO / SERCOM1 PAD1 |
| Chân 23 | PA18 — GPIO / SERCOM1 PAD2 |
| Chân 24 | PA19 — GPIO / SERCOM1 PAD3 |
| Chân 25 | PA20 — GPIO / SERCOM3 PAD0 |
| Chân 26 | PA21 — GPIO / SERCOM3 PAD1 |
| Chân 27 | PA22 — GPIO / SERCOM3 PAD2 |
| Chân 28 | PA23 — GPIO / SERCOM3 PAD3 / USB SOF |
| Chân 29 | PA24 — GPIO / USB_DM |
| Chân 30 | PA25 — GPIO / USB_DP |
| Chân 31 | GND — Ground |
| Chân 32 | VDDIO — Digital I/O supply |
| Chân 33 | PA26 — GPIO |
| Chân 34 | PA27 — GPIO |
| Chân 35 | PA28 — GPIO |
| Chân 36 | PA29 — GPIO / SWDIO (programming) |
| Chân 37 | PA30 — GPIO / SWCLK (programming) |
| Chân 38 | PA31 — GPIO |
| Chân 39 | PB00 — GPIO |
| Chân 40 | PB01 — GPIO |
| Chân 41 | PB02 — GPIO / SERCOM5 PAD0 |
| Chân 42 | PB03 — GPIO / SERCOM5 PAD1 |
| Chân 43 | PB04 — GPIO / SERCOM5 PAD2 |
| Chân 44 | PB05 — GPIO / SERCOM5 PAD3 |
| Chân 45 | PB06 — GPIO / SERCOM4 PAD0 |
| Chân 46 | PB07 — GPIO / SERCOM4 PAD1 |
| Chân 47 | PB08 — GPIO / SERCOM4 PAD2 |
| Chân 48 | PB09 — GPIO / SERCOM4 PAD3 |
| Chân 49 | PB10 — GPIO |
| Chân 50 | PB11 — GPIO |
| Chân 51 | PB12 — GPIO / PTC X0 (touch) |
| Chân 52 | PB13 — GPIO / PTC X1 (touch) |
| Chân 53 | PB14 — GPIO / PTC X2 (touch) |
| Chân 54 | PB15 — GPIO / PTC X3 (touch) |
| Chân 55 | PB16 — GPIO / PTC X4 (touch) |
| Chân 56 | PB17 — GPIO / PTC X5 (touch) |
| Chân 57 | PB18 — GPIO / PTC X6 (touch) |
| Chân 58 | PB19 — GPIO / PTC X7 (touch) |
| Chân 59 | PB20 — GPIO / PTC X8 (touch) |
| Chân 60 | PB21 — GPIO / PTC X9 (touch) |
| Chân 61 | PB22 — GPIO / PTC X10 (touch) |
| Chân 62 | PB23 — GPIO / PTC X11 (touch) |
| Chân 63 | GND — Ground |
| Chân 64 | VDDIO — Digital I/O supply |
Ứng dụng tiêu biểu
ATSAMD20J14B-AU phù hợp cho 7 Áp dụngs: Home Automation Hubs, Smart Metering Endpoints, USB HID Peripherals, Industrial Sensor Interfaces, Capacitive Touch HMI Panels, Consumer Audio Tone Generators, Battery-Powered IoT Sensor Nodes.
Home Automation Hubs
The ATSAMD20J14B-AU is well-suited to home automation nodes because its 48 MHz Cortex-M0+ core, 6 SERCOM channels, and integrated USB 2.0 Full-Speed device enable compact gateways that bridge Zigbee, BLE, or sub-GHz radios to a Wi-Fi host via USB CDC. The 1.62-3.63 V supply accepts 2x AA alkaline (3.0 V) without an LDO, and Standby current below 5 uA extends battery life on battery-backed door/window sensors. The Peripheral Touch Controller adds cost-free capacitive touch buttons on thermostats and dimmer switches.
Được đề xuất
Smart Metering Endpoints
In smart metering endpoints, the ATSAMD20J14B-AU handles pulse counting from mechanical or Hall-effect sensors, drives an LCD segment display, and reports over a wired M-Bus or wireless link. Its 12-bit 350 ksps ADC digitizes voltage and current with sufficient accuracy for Class 1 single-phase meters, while the 24-bit RTC handles time-of-use tariff scheduling. The 64-TQFP package is robust enough for industrial temperature (-40C to +85C) and offers 38 GPIO for keypad scanning and tamper-switch monitoring.
Được đề xuất
USB HID Peripherals
The ATSAMD20J14B-AU's integrated USB 2.0 Full-Speed device with on-chip PHY eliminates external transceiver cost and PCB area, making it ideal for USB keyboards, mice, gamepads, and custom HID peripherals. The 16 KB Flash accommodates USB stacks plus HID report logic, and 2 KB SRAM is enough for endpoint buffering. Microchip's ASF / START USB stack supports HID, CDC, MSD, and vendor classes out of the box. The 33 ohm DP/DM series resistors and ESD diode array are the only external USB components required.
Được đề xuất
Industrial Sensor Interfaces
The ATSAMD20J14B-AU's 12-bit ADC with 12 channels, 2 analog comparators, and 6 SERCOM interfaces make it a strong fit for industrial 4-20 mA loop sensors, RTD/thermocouple front ends, and Modbus RTU slaves. The Cortex-M0+ core's deterministic interrupt latency (12 cycles) suits IEC 61131-3 PLC scan loops. The industrial temperature grade (-40C to +85C) and 1.62-3.63 V supply tolerate noisy 24 V bus rails when paired with an external buck regulator. The 64-TQFP footprint supports through-hole-style rework.
Được đề xuất
Capacitive Touch HMI Panels
The ATSAMD20J14B-AU integrates the Peripheral Touch Controller (PTC) supporting up to 256 self-capacitance or mutual-capacitance electrodes for buttons, sliders, and wheels - ideal for kitchen appliances, white goods, and industrial control panels. The PTC runs autonomously with DMA offloading the Cortex-M0+ core, freeing CPU cycles for HMI logic. The Q-Touch Modular Library provides IEC 61000-4-6 noise immunity, allowing reliable touch operation in noisy industrial environments with motors and inverters nearby.
Được đề xuất
Consumer Audio Tone Generators
The ATSAMD20J14B-AU's 10-bit 350 ksps DAC combined with PWM and timer peripherals enables simple tone generation for doorbells, alarm panels, and consumer electronics. The DAC drives an external op-amp headphone buffer or piezo buzzer with low THD. The Cortex-M0+ core can synthesize wavetable or beep patterns while USB CDC streams firmware updates from a host PC. The 1.62 V minimum VDD allows direct 2x AA alkaline operation without an LDO, reducing BOM cost by USD 0.10-0.20.
Được đề xuất
Battery-Powered IoT Sensor Nodes
In wireless IoT sensor nodes, the ATSAMD20J14B-AU acts as a low-power host controller paired with an SPI-connected radio such as the ATSAMR34 or an external LoRa transceiver. Sleep current below 5 uA combined with a 24-bit RTC and Event System enables multi-year battery life on a CR2032 coin cell. The 6 SERCOM channels connect multiple sensors (temperature, humidity, accelerometer) while the 12-bit ADC digitizes analog channels. Wake-on-interrupt peripherals let the MCU stay asleep until a sensor threshold is crossed.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD20J14B-AU — 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 | ATSAMD20J14A-AU | ATSAMD20J15A-AU | ATSAMD20J16A-AU | ATSAMD20J18A-AU | ATSAMD20J14A-CNT |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (10x10 mm) | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB (+100%) | 64 KB (+300%) | 256 KB (+1500%) | 16 KB |
| SRAM | 2 KB | 2 KB | 4 KB (+100%) | 8 KB (+300%) | 32 KB (+1500%) | 2 KB |
| Max Clock Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Silicon Revision | B | A (earlier) | A | A | A | A |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended (-40C to +105C) |
| USB | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device |
Bảo phân biệt quan trọng
- Latest B-revision silicon with ADC and Event System errata fixes (vsATSAMD20J14A-AU)
- 16 KB Flash is exactly right-sized for cost-sensitive designs (vsATSAMD20J18A-AU)
- 64-TQFP offers 38 GPIO vs 48-pin G variants' reduced pinout (vsATSAMD20G16B-AU)
- Integrated USB 2.0 Full-Speed with on-chip PHY (vsPIC16F677-I/P)
Ghi chú thiết kế
Decouple VDDIN, VDDIO, and VDDCORE each with a 100 nF X7R ceramic placed within 3 mm of the respective pins, plus a single shared 4.7 uF X5R bulk capacitor on VDDIN. According to Microchip's SAM D20 hardware design considerations, the internal 1.2 V LDO sourcing VDDCORE draws high transient current during Sleep-to-Active transitions; insufficient bulk capacitance causes VDDCORE droop and brown-out resets. Place the 4.7 uF as close as possible to pin 11 (VDDIN) and ensure the ground return path is short and direct.
The TQFP-64 (10x10 mm) has a junction-to-ambient thermal resistance of approximately 36 C/W on a standard 4-layer JEDEC test PCB. Estimated: at 48 MHz active current of 7 mA and 3.3 V supply, dissipation is ~23 mW, yielding a junction temperature rise of under 1 C above ambient - thermal management is not a concern at typical industrial operating points. For sealed enclosures or ambient temperatures above 70 C, ensure the 64-pin exposed-pad variant is used to drop theta_JA to ~15 C/W.
Route the USB DP and DM pair as a 90 ohm differential with matched length (within 150 mil), keep series resistors within 4 mm of the MCU, and place the ESD diode array within 10 mm of the USB connector. According to USB 2.0 Full-Speed compliance guidelines, the DP/DM traces must not cross any clock or switching signals and should be guarded by ground pour on both sides. Add a 1 M ohm pull-down on DM and a 22 ohm series resistor on each line to improve signal integrity on long cable runs.
Group the SWDIO/SWCLK (PA29/PA30) programming pins on the same board edge as the debug header to keep the 10-pin Cortex Debug connector trace length below 50 mm. According to Microchip's Atmel-ICE hardware guide, SWD traces should be source-terminated with 33 ohm series resistors for reliable debug at 48 MHz target clock. Decouple VDDIO near the SWD pins and avoid routing high-speed signals (SERCOM SPI at >10 MHz) directly under the debug header footprint.
Do not assume the ATSAMD20J14A and J14B revisions are bit-exact identical - the B revision fixes errata for the ADC and Event System but also revises the GCLK ID mappings. According to Microchip's SAM D20 errata document, firmware compiled against the A revision may need linker script updates when porting to B. Always include the latest CMSIS startup file and ASF version when switching silicon revisions. Also ensure the 32 kHz crystal load capacitance matches the chosen crystal ESR; using too-low load caps results in oscillator startup failures at -40C.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Pb-free TQFP with NiPdAu lead finish. Halogen-free per IEC 61249-2-21. Not AEC-Q100 qualified - choose SAM automotive variants for vehicle applications. Conflict-minerals compliant per Microchip CMRT declaration.
