ATSAMD20J18A-MU - SAM D20 Cortex-M0+ MCU, 256KB Flash | Microchip
料号： ATSAMD20J18A-MU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.8 | $4.80 |
| 10 | $4.32 | $43.20 |
| 100 | $3.84 | $384.00 |
| 500 | $3.46 | $1,730.00 |
| 1,000 | $3.07 | $3,070.00 |
| 3,000 | $2.69 | $8,070.00 |
ATSAMD20J18A-MU 概述
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.
直接替换替代料： ATSAMD20J18A-MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATSAMD20J18A-MU （相同外形与封装尺寸） ——差异在于 Package, ADC, DAC, Operating Temperature, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATSAMD20J18A-MNT
✅ 直接替换✓ 有现货
$3.41 / 个
查看数据手册 →ATSAMD20J18A-AU
✅ 直接替换✓ 有现货
$2.15 / 个
查看数据手册 →ATSAMD21J18A-MU
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD20G18A-MU
✅ 直接替换✓ 有现货
$3.51 / 个
查看数据手册 →ATSAMD20E18A-MU
✅ 直接替换✓ 有现货
$2.75 / 个
查看数据手册 →ATSAMD20J18A-MU 最大额定值与电气特性
| 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) |
| 工作温度 | -40 C to +85 C (industrial) |
| 封装 | 64-pin QFN (9x9 mm) with exposed pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| RTC | 32-bit with calendar |
ATSAMD20J18A-MU 引脚配置
| 引脚 1 | PA00 — General I/O / SERCOM1[0] |
| 引脚 2 | PA01 — General I/O / SERCOM1[1] |
| 引脚 3 | PA02 — General I/O / Analog |
| 引脚 4 | PA03 — General I/O / Analog / ADC reference |
| 引脚 5 | PA04 — General I/O / SERCOM0[0] |
| 引脚 6 | PA05 — General I/O / SERCOM0[1] |
| 引脚 7 | PA06 — General I/O / SERCOM0[2] |
| 引脚 8 | PA07 — General I/O / SERCOM0[3] |
| 引脚 9 | PA08 — General I/O / SERCOM2[0] / I2S |
| 引脚 10 | PA09 — General I/O / SERCOM2[1] / I2S |
| 引脚 11 | PA10 — General I/O / SERCOM2[2] |
| 引脚 12 | PA11 — General I/O / SERCOM2[3] |
| 引脚 13 | PA12 — General I/O / SERCOM4[0] |
| 引脚 14 | PA13 — General I/O / SERCOM4[1] |
| 引脚 15 | PA14 — General I/O / SERCOM4[2] |
| 引脚 16 | PA15 — General I/O / SERCOM4[3] |
| 引脚 17 | PA16 — General I/O / SERCOM3[0] |
| 引脚 18 | PA17 — General I/O / SERCOM3[1] |
| 引脚 19 | PA18 — General I/O / SERCOM3[2] |
| 引脚 20 | PA19 — General I/O / SERCOM3[3] |
| 引脚 21 | PA20 — General I/O / SERCOM5[2] |
| 引脚 22 | PA21 — General I/O / SERCOM5[3] |
| 引脚 23 | PA22 — General I/O / SERCOM5[0] |
| 引脚 24 | PA23 — General I/O / SERCOM5[1] |
| 引脚 25 | PA24 — General I/O / SERCOM3[2] alt |
| 引脚 26 | PA25 — General I/O / SERCOM3[3] alt |
| 引脚 27 | PB02 — General I/O / Analog / ADC[14] |
| 引脚 28 | PB03 — General I/O / Analog |
| 引脚 29 | PB04 — General I/O / Analog |
| 引脚 30 | PB05 — General I/O / Analog |
| 引脚 31 | PB06 — General I/O / Analog |
| 引脚 32 | PB07 — General I/O / Analog |
| 引脚 33 | PB08 — General I/O / Analog |
| 引脚 34 | PB09 — General I/O / Analog |
| 引脚 35 | PB10 — General I/O / Analog |
| 引脚 36 | PB11 — General I/O / Analog |
| 引脚 37 | PB12 — General I/O / SERCOM4[0] alt |
| 引脚 38 | PB13 — General I/O / SERCOM4[1] alt |
| 引脚 39 | PB14 — General I/O / SERCOM4[2] alt |
| 引脚 40 | PB15 — General I/O / SERCOM4[3] alt |
| 引脚 41 | PB16 — General I/O / SERCOM5[0] alt |
| 引脚 42 | PB17 — General I/O / SERCOM5[1] alt |
| 引脚 43 | PA27 — General I/O / XIN32 / Crystal input |
| 引脚 44 | PA28 — General I/O / XOUT32 / Crystal output |
| 引脚 45 | RESETN — Reset input (active low) |
| 引脚 46 | PA30 — General I/O / SWCLK |
| 引脚 47 | PA31 — General I/O / SWDIO |
| 引脚 48 | VDDIO — I/O supply voltage |
| 引脚 49 | GND — Ground |
| 引脚 50 | VDDIO — I/O supply voltage |
| 引脚 51 | GND — Ground |
| 引脚 52 | VDDIO — I/O supply voltage |
| 引脚 53 | GND — Ground |
| 引脚 54 | VDDCORE — Internal core voltage (decoupling) |
| 引脚 55 | GND — Ground |
| 引脚 56 | VDDIO — I/O supply voltage |
| 引脚 57 | GND — Ground |
| 引脚 58 | VDDIO — I/O supply voltage |
| 引脚 59 | GND — Ground |
| 引脚 60 | VDDIO — I/O supply voltage |
| 引脚 61 | PA06 — General I/O alt |
| 引脚 62 | PA07 — General I/O alt |
| 引脚 63 | PA08 — General I/O alt |
| 引脚 64 | PA09 — General I/O alt / XIN |
| 引脚 EP | EP — Exposed pad - must be soldered to ground pour |
典型应用
ATSAMD20J18A-MU 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ATSAMD20J18A-MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Highest memory variant in the SAM D20J 64-QFN family （对比 ATSAMD20J17A-MU (same package))
- Same package as ATSAMD21J18A-MU enables in-field USB upgrade （对比 ATSAMD21J18A-MU)
- PTC with 256 sensors - no external touch IC required （对比 ATSAMD20G18A-MU (48-pin))
设计说明
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.
合规信息
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.
