ATSAMC20J18A-MNT - 256KB Flash SAM C20 Cortex-M0+ MCU | Microchip
MPN： ATSAMC20J18A-MNT ✓ 啟用中ATSAMC20J18A-MNT 概覽
Key features include 256KB (256K x 8) Flash memory, 32KB SRAM, 48MHz maximum CPU frequency, and 52 programmable I/O pins across 6 SERCOM channels configurable as UART/SPI/I2C. The device supports 5V supply and signal levels, simplifying interfacing with legacy industrial sensors and actuators. It also incorporates a full-speed USB 2.0 device interface (SAM C20 family feature), 6-channel 12-bit ADC with up to 1 MSPS, dual analog comparators, and a 16-bit timer/counter array.
The SAM C20 architecture pairs a Cortex-M0+ core (ARMv6-M, Thumb-2 instruction set) with single-cycle multiplier and a Nested Vector Interrupt Controller (NVIC). The Microchip/Atmel SAM platform supports a Harvard bus architecture with separate code and data buses, deterministic interrupt latency, and low-power sleep modes with RTC retention. Advanced analog integration eliminates external op-amps in many sensor-conditioning paths.
Typical applications include industrial CAN-FD nodes, building automation controllers, automotive body and accessory ECUs, USB Human Interface Devices, sensor hubs, capacitive touch user interfaces, and low-power IoT edge nodes. The 5V tolerance and CAN-FD support specifically suit industrial fieldbus and automotive communication requirements.
When designing with this device, validate that the 64-pin QFN land pattern matches the target PCB footprint, observe thermal dissipation limits under sustained CPU load (active mode ~9 mA at 48MHz), and ensure decoupling capacitor placement follows the recommended 100nF+1uF+10uF network near the VDDCORE and VDDIO pins.
直接替換替代品，適用於 ATSAMC20J18A-MNT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAMC20J18A-MNT （相同外形與佔位） — 差異在於 Package, ADC, Operating Temperature, RoHS Status, DAC.
ATSAMC21J18A-MNT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMC20J17A-MNT
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAMC20J16A-MUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMC20E18A-MUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD20J18A-MNT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMC20G18A-ANT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMC20J18A-MNT 最大額定值與電氣特性
| Series | SAM C20 |
| Core | ARM Cortex-M0+ |
| Core Architecture | ARMv6-M (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Program Memory Size | 256 KB (256K x 8) Flash |
| RAM Size | 32 KB SRAM |
| Supply Voltage (VDDIN) | 2.7 V to 5.5 V |
| 工作溫度 | -40 C to +105 C (Industrial, M-grade) |
| I/O Pins | 52 programmable I/O |
| Communication Interfaces | CAN-FD, USB 2.0 FS, 6x SERCOM (UART/SPI/I2C), I2S |
| ADC | 12-bit, up to 1 MSPS |
| DAC | 10-bit |
| 封裝 | 64-pin QFN (VQFN) 9x9 mm with exposed pad |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (Green, lead-free) |
| MSL 等級 | MSL3 |
| Peripheral Touch Controller | Yes (PTC, capacitive touch) |
| Data Sheet Publish Date | 2016-11-04 |
ATSAMC20J18A-MNT 腳位配置
| 腳位 1 | PA00 — GPIO / XIN32 (external 32kHz crystal input) |
| 腳位 2 | PA01 — GPIO / XOUT32 (external 32kHz crystal output) |
| 腳位 3 | PA02 — GPIO / AIN0 (ADC input) |
| 腳位 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| 腳位 5 | GND — Ground |
| 腳位 6 | VDDIO — I/O supply voltage |
| 腳位 7 | PA04 — GPIO / AIN2 |
| 腳位 8 | PA05 — GPIO / AIN3 |
| 腳位 9 | PA06 — GPIO / AIN4 |
| 腳位 10 | PA07 — GPIO / AIN5 |
| 腳位 11 | PA08 — GPIO / AIN6 / SERCOM0 PAD0 |
| 腳位 12 | PA09 — GPIO / AIN7 / SERCOM0 PAD1 |
| 腳位 13 | PA10 — GPIO / AIN8 / SERCOM0 PAD2 |
| 腳位 14 | PA11 — GPIO / AIN9 / SERCOM0 PAD3 |
| 腳位 15 | PA12 — GPIO / SERCOM1 PAD0 |
| 腳位 16 | PA13 — GPIO / SERCOM1 PAD1 |
| 腳位 17 | PA14 — GPIO / SERCOM1 PAD2 |
| 腳位 18 | PA15 — GPIO / SERCOM1 PAD3 |
| 腳位 19 | PA16 — GPIO / SERCOM2 PAD0 |
| 腳位 20 | PA17 — GPIO / SERCOM2 PAD1 |
| 腳位 21 | PA18 — GPIO / SERCOM2 PAD2 |
| 腳位 22 | PA19 — GPIO / SERCOM2 PAD3 |
| 腳位 23 | PA20 — GPIO / SERCOM3 PAD0 |
| 腳位 24 | PA21 — GPIO / SERCOM3 PAD1 |
| 腳位 25 | PA22 — GPIO / SERCOM3 PAD2 |
| 腳位 26 | PA23 — GPIO / SERCOM3 PAD3 |
| 腳位 27 | PA24 — GPIO / USB_DM |
| 腳位 28 | PA25 — GPIO / USB_DP |
| 腳位 29 | GND — Ground |
| 腳位 30 | VDDIO — I/O supply voltage |
| 腳位 31 | PA27 — GPIO |
| 腳位 32 | PA28 — GPIO / SERCOM4 PAD0 |
| 腳位 33 | PA29 — GPIO / SERCOM4 PAD1 |
| 腳位 34 | PA30 — GPIO / SERCOM4 PAD2 / TCC0 WO0 |
| 腳位 35 | PA31 — GPIO / SERCOM4 PAD3 / TCC0 WO1 |
| 腳位 36 | PB00 — GPIO / SERCOM5 PAD0 |
| 腳位 37 | PB01 — GPIO / SERCOM5 PAD1 |
| 腳位 38 | PB02 — GPIO / SERCOM5 PAD2 / ADC AIN14 |
| 腳位 39 | PB03 — GPIO / SERCOM5 PAD3 / ADC AIN15 |
| 腳位 40 | PB04 — GPIO / SERCOM5 PAD0 (alt) |
| 腳位 41 | PB05 — GPIO / SERCOM5 PAD1 (alt) |
| 腳位 42 | PB06 — GPIO / SERCOM4 PAD0 (alt) |
| 腳位 43 | PB07 — GPIO / SERCOM4 PAD1 (alt) |
| 腳位 44 | PB08 — GPIO / SERCOM4 PAD2 (alt) |
| 腳位 45 | PB09 — GPIO / SERCOM4 PAD3 (alt) |
| 腳位 46 | PB10 — GPIO |
| 腳位 47 | PB11 — GPIO |
| 腳位 48 | PB12 — GPIO / CAN RX |
| 腳位 49 | PB13 — GPIO / CAN TX |
| 腳位 50 | PB14 — GPIO |
| 腳位 51 | PB15 — GPIO |
| 腳位 52 | PB16 — GPIO |
| 腳位 53 | PB17 — GPIO |
| 腳位 54 | PB18 — GPIO |
| 腳位 55 | PB19 — GPIO |
| 腳位 56 | PB20 — GPIO |
| 腳位 57 | PB21 — GPIO |
| 腳位 58 | PB22 — GPIO |
| 腳位 59 | PB23 — GPIO |
| 腳位 60 | PB24 — GPIO |
| 腳位 61 | PB25 — GPIO |
| 腳位 62 | VDDIO — I/O supply voltage |
| 腳位 63 | GND — Ground |
| 腳位 64 | VDDCORE — Internal core supply (1.2V LDO output) |
典型應用
ATSAMC20J18A-MNT 適用於 8 應用s: Industrial CAN-FD Communication Nodes, Building Automation Controllers, Automotive Body and Accessory ECUs, USB Human Interface Devices, Capacitive Touch User Interfaces, Low-Power IoT Edge Sensor Hubs, Sensor Signal Conditioning and Acquisition, USB-Powered Industrial Data Loggers.
Industrial CAN-FD Communication Nodes
The ATSAMC20J18A-MNT integrates a hardware CAN-FD controller supporting both Classical CAN 2.0B and CAN Flexible Data-Rate frames at up to 5 Mbit/s, making it ideal for industrial fieldbus nodes such as CANopen, DeviceNet, and NMEA 2000 networks. Its 5V supply and I/O tolerance eliminates level-shifters between sensors and the MCU, while 256KB Flash fits full CANopen stack plus application logic. Place the MCU between 24V industrial sensor rails and field actuators; the on-chip CAN-FD transceivers can pair with external high-speed transceivers such as the MCP2562FD.
推薦
Building Automation Controllers
Building automation systems require multiple wired interfaces (BACnet, Modbus, RS-485) and capacitive touch user interfaces. The ATSAMC20J18A-MNT's 6 SERCOM channels configure as UART/SPI/I2C plus the integrated Peripheral Touch Controller (PTC) for capacitive buttons and sliders make it well suited. The 52 I/O pins drive relays, triacs, and LED indicators directly. Operating from -40 C to +105 C industrial temperature range, it handles HVAC control panels, smart thermostats, and access control keypads in commercial environments.
推薦
Automotive Body and Accessory ECUs
The ATSAMC20J18A-MNT's 5V supply tolerance and CAN-FD support suit automotive body control modules such as seat controllers, mirror adjusters, interior lighting, and door modules. Its Cortex-M0+ core runs at 48MHz with deterministic interrupt latency for sensor polling, while the 12-bit ADC reads automotive sensor signals. The 64-QFN package with exposed pad provides robust thermal performance. Pair with automotive CAN transceivers such as the MCP2562FD for body-domain networks at 500 kbit/s Classical CAN or 2 Mbit/s CAN-FD.
推薦
USB Human Interface Devices
USB HID peripherals such as industrial keypads, barcode scanners, custom input devices, and laboratory instruments benefit from the ATSAMC20J18A-MNT's integrated USB 2.0 full-speed device controller plus 256KB Flash for HID stacks. The 32KB SRAM buffers HID reports comfortably, while the 12-bit ADC reads analog inputs like joystick potentiometers. Implementation in the Microchip ASF or MPLAB Harmony framework reduces firmware development time. Connect D+/D- lines through 27-ohm series resistors to a USB Type-B or Type-C receptacle with proper ESD protection.
推薦
Capacitive Touch User Interfaces
The ATSAMC20J18A-MNT's integrated Peripheral Touch Controller (PTC) supports up to 256 touch channels through hardware-driven capacitance-to-digital conversion, enabling robust buttons, sliders, and wheels without external touch ICs. Combined with the 12-bit ADC for proximity sensing and the 6 SERCOM channels for display communication, the MCU drives touch-based appliance panels, smart locks, and consumer devices. The -40 C to +105 C industrial temperature range and 5V operation suit kitchen appliances and outdoor controls.
推薦
Low-Power IoT Edge Sensor Hubs
For battery-powered or energy-harvesting IoT edge nodes, the ATSAMC20J18A-MNT offers multiple low-power sleep modes with RTC retention and a 12-bit ADC for sensor signal acquisition. Operating from 2.7V to 5.5V supply, it works with single-cell Li-Ion, 3.3V system, or 5V industrial rails. The 256KB Flash accommodates TLS client libraries and OTA bootloader. Active mode at 48MHz draws approximately 9 mA; standby current drops below 5 uA with RTC running, suitable for wireless sensor hubs using companion radios like ATSAMR21 or external LoRa modules.
推薦
Sensor Signal Conditioning and Acquisition
The ATSAMC20J18A-MNT's 12-bit ADC up to 1 MSPS plus dual analog comparators and a 10-bit DAC enable integrated sensor signal conditioning for thermocouples, RTDs, strain gauges, and process-control analog signals. The SERCOM channels communicate with external SPI ADCs for higher-resolution measurements. The 256KB Flash implements calibration tables and linearization firmware. With 5V analog supply tolerance, it directly interfaces with 0-10V industrial sensors commonly found in process automation, eliminating external signal conditioning.
推薦
USB-Powered Industrial Data Loggers
Portable data loggers powered through USB use the ATSAMC20J18A-MNT's integrated USB 2.0 device interface plus 256KB Flash for storing configuration and small data buffers. Larger logs stream over USB to a host PC. The 12-bit ADC reads voltage, current, temperature sensors for industrial process logging, while the 5V I/O tolerance handles transducer signals directly. The 64-QFN exposed pad simplifies thermal management for sustained operation in factory-floor environments where ambient temperatures can approach 105 C.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAMC20J18A-MNT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATSAMC21J18A-MNT | ATSAMC20J17A-MNT | ATSAMC20E18A-MUT | ATSAMD20J18A-MNT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| CPU Core | ARM Cortex-M0+ | ARM Cortex-M0+ with FPU | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max CPU Frequency | 48 MHz | 64 MHz (+33%) | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 128 KB (-50%) | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 16 KB (-50%) | 32 KB | 32 KB |
| CAN-FD Support | Yes (hardware) | Yes (hardware) | Yes (hardware) | Yes (hardware) | No |
| USB Interface | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device |
| 5V I/O Tolerance | Yes | Yes | Yes | Yes | No (3.3V only) |
| Peripheral Touch Controller | Yes (PTC) | Yes (PTC) | Yes (PTC) | Yes (PTC) | Yes (PTC) |
主要差異化特點
- Integrated hardware CAN-FD controller (對比ATSAMD20J18A-MNT)
- 5V supply and I/O tolerance (對比ATSAMD20J18A-MNT)
- Same QFN-64 footprint with FPU upgrade option (對比ATSAMC21J18A-MNT)
設計說明
The ATSAMC20J18A-MNT requires a careful power decoupling network per the SAM C20 datasheet: place a 100 nF ceramic capacitor on each VDDIO pin, a 1 uF ceramic on VDDCORE, and a 10 uF bulk capacitor on VDDIN. Estimated: with VDDIN at 5V and active mode ~9 mA at 48 MHz, total supply current is approximately 9 mA; at 3.3V it drops to ~6 mA. For USB applications, add a 4.7 uF capacitor on VBUS to support USB inrush currents.
The 64-QFN exposed pad (EP) is the primary thermal dissipation path and MUST be soldered to a continuous ground plane on the top or inner PCB layer. Estimated: theta_JA for the 9x9 mm QFN with EP on a 4-layer JEDEC test board is approximately 28 C/W; in a real 2-layer design with limited ground copper, theta_JA may rise to 50 C/W. At maximum active mode power of 50 mW, junction temperature rise stays well within -40 C to +105 C operation.
For USB signal integrity, route the D+ and D- traces as a 90-ohm differential pair with controlled impedance, matching lengths within 150 mil. Place the 27-ohm series resistors close to the MCU pins PA24/PA25. For CAN-FD, route CANH and CANL as a 120-ohm differential pair with termination resistor at the bus ends. Keep analog signals (ADC inputs, VREFA) away from high-speed digital and USB traces.
Do not exceed 5.5 V on VDDIN or any I/O pin - the 5V tolerance applies only when VDDIO is configured for 5V operation. For SAM D20 cross-migration: the D20 lacks CAN-FD and 5V tolerance; replacing C20 with D20 in a 5V design will damage the I/O cells. Always verify the firmware's NVIC interrupt priorities match the Cortex-M0+ 4-level priority scheme and use the appropriate CMSIS register definitions.
When using the 12-bit ADC at 1 MSPS, place an anti-aliasing RC filter (typically 1 kohm + 1 nF = 159 kHz cutoff) on each analog input. Use a stable low-noise reference source for VREFA (e.g., REF3025 or MCP1525) - any noise on VREFA directly couples into ADC readings. For capacitive touch via PTC, route touch traces with ground shielding and avoid running noisy digital traces adjacent to them.
合規資訊
RoHS compliant and Green per Microchip ordering information. Lead-free and halogen-free per Microchip environmental declarations. Industrial temperature grade -40 C to +105 C; not AEC-Q100 qualified - choose ATSAMC20J18A-AUT variant for automotive applications.
