ATSAMD20J18A-MU - SAM D20 Cortex-M0+ MCU, 256KB Flash | Microchip
MPN: ATSAMD20J18A-MU ✓ Hoạt độngATSAMD20J18A-MU Tóm tắt
A Cortex-M0+ microcontroller is the smallest and most energy-efficient core in the ARM Cortex-M family, designed for deterministic embedded control. Within the broader semiconductor hierarchy it sits inside the microcontroller category, itself a sub-class of microprocessors and ultimately of integrated circuits. The SAM D20 family specifically targets low-power applications, where deep-sleep current, fast wake-up and peripheral event system behaviour determine battery lifetime and are critical design parameters.
Key differentiating features of the ATSAMD20J18A-MU include its Event System for CPU-independent peripheral interconnect, a 32-bit RTC with calendar mode, and a 12-bit 350 ksps ADC with up to 20 channels. The integrated PTC supports robust capacitive touch sensing up to 256 sensors without external ICs, while the SERCOM peripherals can be independently configured as USART, I2C or SPI, giving strong pin-out flexibility within the 64-pin footprint.
The device leverages a single-cycle hardware multiplier, an MPU for memory protection, and a low-power Brown-Out Detector. Its SleepWalking capability lets peripherals wake the core only when meaningful data is available, enabling sub-microamp idle budgets while keeping analogue blocks ready. Internal voltage regulation keeps digital noise isolated from sensitive analogue domains.
Typical applications include smart-home and building automation nodes, low-power wireless sensor hubs, consumer human-interface products using capacitive touch, motor control companion MCUs, smart lighting controllers, and metering/instrumentation endpoints. The wide 1.62 V-3.6 V supply range and onboard analogue make it equally suitable for battery-powered wearables and industrial 3.3 V backplanes.
When designing with this part, prioritise decoupling close to all VDD pins, route the exposed pad to a continuous ground copper pour for thermal dissipation, and verify that the chosen SERCOM mapping matches your required pinout before PCB fabrication. Always consult the device datasheet for the latest errata, package land pattern and absolute maximum ratings.
This page synthesizes distributor pricing, drop-in alternatives, application notes and design considerations beyond what is contained in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD20J18A-MU — 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 ATSAMD20J18A-MU (cùng hình factor và footprint) — khác nhau ở Package, ADC, DAC, Operating Temperature, SRAM.
ATSAMD20J18A-MNT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD20J18A-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J18A-MU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD20G18A-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD20E18A-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD20J18A-MU Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| CoreMark/MHz | 2.14 |
| Program Flash Memory | 256 KB |
| SRAM | 32 KB |
| Supply Voltage (Vcc/Vdd) | 1.62 V to 3.6 V |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit |
| Peripheral Touch Controller (PTC) | 256 channels |
| Serial Communication (SERCOM) | Up to 6 (configurable as USART/I2C/SPI) |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Hộp | 64-pin QFN (9x9 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| RTC | 32-bit with calendar |
Cấu hình chân ATSAMD20J18A-MU
| Chân 1 | PA00 — General I/O / SERCOM1[0] |
| Chân 2 | PA01 — General I/O / SERCOM1[1] |
| Chân 3 | PA02 — General I/O / Analog |
| Chân 4 | PA03 — General I/O / Analog / ADC reference |
| Chân 5 | PA04 — General I/O / SERCOM0[0] |
| Chân 6 | PA05 — General I/O / SERCOM0[1] |
| Chân 7 | PA06 — General I/O / SERCOM0[2] |
| Chân 8 | PA07 — General I/O / SERCOM0[3] |
| Chân 9 | PA08 — General I/O / SERCOM2[0] / I2S |
| Chân 10 | PA09 — General I/O / SERCOM2[1] / I2S |
| Chân 11 | PA10 — General I/O / SERCOM2[2] |
| Chân 12 | PA11 — General I/O / SERCOM2[3] |
| Chân 13 | PA12 — General I/O / SERCOM4[0] |
| Chân 14 | PA13 — General I/O / SERCOM4[1] |
| Chân 15 | PA14 — General I/O / SERCOM4[2] |
| Chân 16 | PA15 — General I/O / SERCOM4[3] |
| Chân 17 | PA16 — General I/O / SERCOM3[0] |
| Chân 18 | PA17 — General I/O / SERCOM3[1] |
| Chân 19 | PA18 — General I/O / SERCOM3[2] |
| Chân 20 | PA19 — General I/O / SERCOM3[3] |
| Chân 21 | PA20 — General I/O / SERCOM5[2] |
| Chân 22 | PA21 — General I/O / SERCOM5[3] |
| Chân 23 | PA22 — General I/O / SERCOM5[0] |
| Chân 24 | PA23 — General I/O / SERCOM5[1] |
| Chân 25 | PA24 — General I/O / SERCOM3[2] alt |
| Chân 26 | PA25 — General I/O / SERCOM3[3] alt |
| Chân 27 | PB02 — General I/O / Analog / ADC[14] |
| Chân 28 | PB03 — General I/O / Analog |
| Chân 29 | PB04 — General I/O / Analog |
| Chân 30 | PB05 — General I/O / Analog |
| Chân 31 | PB06 — General I/O / Analog |
| Chân 32 | PB07 — General I/O / Analog |
| Chân 33 | PB08 — General I/O / Analog |
| Chân 34 | PB09 — General I/O / Analog |
| Chân 35 | PB10 — General I/O / Analog |
| Chân 36 | PB11 — General I/O / Analog |
| Chân 37 | PB12 — General I/O / SERCOM4[0] alt |
| Chân 38 | PB13 — General I/O / SERCOM4[1] alt |
| Chân 39 | PB14 — General I/O / SERCOM4[2] alt |
| Chân 40 | PB15 — General I/O / SERCOM4[3] alt |
| Chân 41 | PB16 — General I/O / SERCOM5[0] alt |
| Chân 42 | PB17 — General I/O / SERCOM5[1] alt |
| Chân 43 | PA27 — General I/O / XIN32 / Crystal input |
| Chân 44 | PA28 — General I/O / XOUT32 / Crystal output |
| Chân 45 | RESETN — Reset input (active low) |
| Chân 46 | PA30 — General I/O / SWCLK |
| Chân 47 | PA31 — General I/O / SWDIO |
| Chân 48 | VDDIO — I/O supply voltage |
| Chân 49 | GND — Ground |
| Chân 50 | VDDIO — I/O supply voltage |
| Chân 51 | GND — Ground |
| Chân 52 | VDDIO — I/O supply voltage |
| Chân 53 | GND — Ground |
| Chân 54 | VDDCORE — Internal core voltage (decoupling) |
| Chân 55 | GND — Ground |
| Chân 56 | VDDIO — I/O supply voltage |
| Chân 57 | GND — Ground |
| Chân 58 | VDDIO — I/O supply voltage |
| Chân 59 | GND — Ground |
| Chân 60 | VDDIO — I/O supply voltage |
| Chân 61 | PA06 — General I/O alt |
| Chân 62 | PA07 — General I/O alt |
| Chân 63 | PA08 — General I/O alt |
| Chân 64 | PA09 — General I/O alt / XIN |
| Chân EP | EP — Exposed pad - must be soldered to ground pour |
Ứng dụng tiêu biểu
ATSAMD20J18A-MU phù hợp cho 6 Áp dụngs: Smart Home and Home Appliance Control, Industrial Sensor and Metering Endpoints, Capacitive Touch Human-Machine Interface, Battery-Powered Wearable Health Devices, Smart Lighting and LED Drivers, Low-Power Wireless Sensor Hubs.
Smart Home and Home Appliance Control
The ATSAMD20J18A-MU fits smart-home hubs and appliance controllers because its Cortex-M0+ core at 48 MHz easily runs Zigbee/BLE HCI stacks or sub-GHz radio command interfaces, while the integrated 256-channel PTC supports robust capacitive touch keypads, sliders and proximity sensors used in washing machines, induction cooktops and HVAC thermostats. The 1.62 V-3.6 V supply range lets the same design work from a 3.3 V industrial rail or a single-cell Li-ion battery, eliminating the need for a second regulator. Compared with a switching supply followed by an LDO, the SAM D20's SleepWalking peripherals keep idle current under 1.5 uA while analogue blocks remain ready, which is critical for always-on mains-connected appliances that must meet standby energy regulations.
Được đề xuất
Industrial Sensor and Metering Endpoints
In industrial 4-20 mA loop-powered transmitters, water/gas meters and remote sensor endpoints, the ATSAMD20J18A-MU's 12-bit 350 ksps ADC with up to 20 channels can digitise multiple sensor bridges, while the 10-bit DAC generates excitation waveforms. Its 1.62 V minimum supply allows operation from a shunt-regulated loop or solar cell with supercapacitor backup. The SERCOM modules configured as SPI or I2C master drive external FRAM, accelerometers and LoRaWAN transceivers. The wide -40 C to +85 C industrial temperature range and 256 KB Flash permit full Modbus, Wireless M-Bus or DLMS/COSEM protocol stacks on-device, replacing external communication ASICs and shrinking the BOM.
Được đề xuất
Capacitive Touch Human-Machine Interface
The 256-channel Peripheral Touch Controller (PTC) integrated in the ATSAMD20J18A-MU drives up to 256 self- or mutual-capacitance electrodes directly, supporting full touch keypads, sliders, wheels and 2D touchpads without an external touch IC. The 12-bit ADC and the configurable SERCOM peripherals handle backlight PWM, haptics drivers and host communication. Because PTC acquisition runs independently of the CPU via the Event System, the Cortex-M0+ core can remain in standby while touch scanning continues, dropping average current below 5 uA on battery-powered remote controls, white-good front panels and industrial HMI glass-front panels.
Được đề xuất
Battery-Powered Wearable Health Devices
Wearable fitness bands, pulse-oximeter rings and continuous glucose monitor patches benefit from the ATSAMD20J18A-MU's low-power architecture: SleepWalking peripherals, sub-microamp deep-sleep modes and fast 1.5 us wake-up time. The 12-bit ADC samples PPG, SpO2 or bio-impedance waveforms at kHz rates while the on-chip 10-bit DAC drives constant-current LED excitation. The 1.62 V minimum VDD suits CR2032 coin cells or small Li-Po batteries. Integrated SERCOMs connect to BLE or NFC transceivers over SPI/I2C and to displays over SPI, and the 32 KB SRAM buffers multiple sensor streams without needing an external memory chip.
Được đề xuất
Smart Lighting and LED Drivers
Connected LED drivers for architectural and horticultural lighting use the ATSAMD20J18A-MU to generate multi-channel PWM via TCC timers and read colour-mixing feedback from photodiodes through the 12-bit ADC. The 256 KB Flash holds DMX512, DALI, Zigbee or Matter commissioning stacks; the 32 KB SRAM smooths art-net frame streams at 44 Hz refresh. With a 1.62 V-3.6 V supply the MCU can be powered directly from a constant-current LED string, while the SERCOM UART adds wired DMX/RDM ports. The PTC adds capacitive sliders for fixture wall controls without extra touch ICs.
Được đề xuất
Low-Power Wireless Sensor Hubs
For WirelessHART, LoRaWAN, Sigfox or proprietary sub-GHz sensor hubs, the ATSAMD20J18A-MU acts as a host MCU paired with a radio transceiver over SPI. Its 256 KB Flash accommodates full LoRaWAN class A/C stacks with secure-element handling, and the 32 KB SRAM buffers downlink windows while keeping the radio in sleep between transmissions. Sleep currents below 1.5 uA extend battery life to >10 years on 2x AA cells. The integrated Event System lets the radio interrupt the MCU only when a real packet arrives, dropping average current by an order of magnitude versus polling architectures.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD20J18A-MU — 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 | ATSAMD20J18A-MNT | ATSAMD20J18A-AU | ATSAMD21J18A-MU | ATSAMD20G18A-MU | ATSAMD20E18A-MU |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) | 64-TQFP | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) | 32-QFN / 32-TQFP |
| 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 | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| USB | No | No | No | Yes (USB 2.0 FS) | No | No |
| Pin Count | 64 | 64 | 64 | 64 | 48 | 32 |
| Operating Voltage | 1.62 V - 3.6 V | 1.62 V - 3.6 V | 1.62 V - 3.6 V | 1.62 V - 3.6 V | 1.62 V - 3.6 V | 1.62 V - 3.6 V |
Bảo phân biệt quan trọng
- Highest memory variant in the SAM D20J 64-QFN family (vsATSAMD20J17A-MU (same package))
- Same package as ATSAMD21J18A-MU enables in-field USB upgrade (vsATSAMD21J18A-MU)
- PTC with 256 sensors - no external touch IC required (vsATSAMD20G18A-MU (48-pin))
Ghi chú thiết kế
Place 100 nF X7R decoupling capacitors as close as possible to every VDDIO and VDDCORE pin (one per supply pin per the SAM D20 datasheet), and add a single 4.7 uF bulk capacitor near the package. The ATSAMD20J18A-MU's internal core LDO will draw sharp transients during SleepWalking events; inadequate bulk capacitance causes VCCORE sag and brown-out resets. Keep the exposed pad (EP) soldered to a low-impedance ground pour for both thermal dissipation and electrical return.
Estimated: at 48 MHz with all SERCOMs active and the 12-bit ADC converting at 200 ksps, the ATSAMD20J18A-MU draws roughly 7 mA active current. The 64-QFN package has theta_JA of about 33 C/W on a standard 4-layer JEDEC test board, giving a 7 mA x 3.3 V x 33 C/W = ~0.8 C temperature rise above ambient. Thermal management is rarely a constraint, but in enclosed IP65 housings derate VDD to 3.0 V to stay within the 85 C industrial limit.
Route the SWD signals (SWCLK on PA30, SWDIO on PA31) with 50 ohm impedance and a maximum length of 50 mm to avoid programming failures. Place a 4.7 kohm pull-up on RESETN and ensure no series resistance exceeds 1 kohm. For PTC touch traces, route them on the top layer under the touch electrodes only, with a ground hatch fill on layer 2 - crossing any other signal trace over a touch line injects capacitance that can degrade touch sensitivity.
Do not leave the VDDCORE pin floating or skip its decoupling capacitor; the internal LDO regulator needs a 1 uF low-ESR cap on VDDCORE for stability. Also, configure unused pins as inputs with internal pull enabled (not analog) to avoid excessive current draw through the input protection network. Finally, when migrating from the ATSAMD20J18A-MU to the ATSAMD21J18A-MU, double-check SERCOM4/SERCOM5 muxing because the D21 family reassigns some alternate peripheral functions.
Thông tin tuân thủ
Industrial temperature grade -40 C to +85 C. Not AEC-Q100 qualified; for automotive use, choose SAM DA1 or SAM V71 families. RoHS and REACH compliance per Microchip product page.
