ATSAMC21J18A-ANT - 32-bit ARM Cortex-M0+ MCU 48MHz CAN-FD | Microchip
料号： ATSAMC21J18A-ANT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.49 | $6.49 |
| 10 | $5.86 | $58.60 |
| 100 | $5.18 | $518.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.1 | $4,100.00 |
ATSAMC21J18A-ANT 概述
What is an ARM Cortex-M0+ microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, and peripherals. The Cortex-M0+ is ARM's smallest and most energy-efficient 32-bit core, optimized for deterministic interrupt response and low active power. The SAM C21 series extends that core with 5V-tolerant I/O, hardware CAN-FD, and advanced analog, positioning it as a 5V-rail cousin of the lower-voltage SAM D20/D21 families. Within the broader product taxonomy, the ATSAMC21J18A-ANT falls under MCU -> embedded microcontroller -> ARM Cortex-M -> power-management-aware industrial controller.
Key features include a single-cycle hardware multiplier, a Peripheral Touch Controller (PTC), six SERCOM serial-communication modules, a full-speed USB 2.0 device interface, a 12-bit ADC with up to 16 channels, two analog comparators, and a CAN-FD controller. The 5V supply tolerance enables direct connection to 5V sensors, relay drivers and industrial buses without level shifters.
Technically, the device implements the Cortex-M0+ core with a 2-stage pipeline, NVIC with 32 interrupts, and an optional Micro Trace Buffer for lightweight instruction tracing via the SWD debug port. The 5V-tolerant I/Os and the integrated brown-out detector (BOD) plus a separate VDDCORE LDO regulator allow the same part to operate from a single 5V rail or from regulated 3.3V/1.8V cores with 5V I/O. Internal flash endurance is rated for 25 k write cycles, with the 8 KB EEPROM-emulation block extending endurance through wear-leveling firmware.
Typical applications include industrial CAN-FD sensor nodes, 5V motor-control front-ends, building-automation controllers, automotive body and accessory modules (in non-AEC-Q100 grades), and USB-CDC/HID human-interface peripherals such as touch keypads or industrial HMIs. The combination of 5V I/O, CAN-FD and 256 KB Flash is the typical sweet spot for IIoT edge nodes operating on 24V backplanes.
Designers should note that the -ANT suffix denotes Tape & Reel packaging and the standard (non-AUT non-MNT) temperature grade of -40C to +105C. The CAN-FD peripheral supports ISO 11898-1:2015 and is fully backward-compatible with classic CAN 2.0B at bit rates up to 1 Mbit/s. When migrating to the smaller C20 or larger C21N variants, peripheral mapping and pinout remain consistent across the family.
This page synthesizes distributor pricing, drop-in same-family alternates (ATSAMC21J17A, ATSAMC21J16A), pin-compatible SAM C20 devices, and practical firmware-level design notes not collated in any single Microchip datasheet chapter.
直接替换替代料： ATSAMC21J18A-ANT ——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： ATSAMC21J18A-ANT （相同外形与封装尺寸） ——差异在于 Package, Core, RoHS Status, Mounting Type, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATSAMC21J17A-ANT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMC21J15A-ANT
✅ 直接替换✓ 有现货
$1.18 / 个
查看数据手册 →ATSAMC20J18A-ANT
✅ 直接替换✓ 有现货
$2.78 / 个
查看数据手册 →ATSAMC20J18A-AUT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.1 / 个
查看数据手册 →ATSAMC21J18A-AUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMC21J18A-ANT 最大额定值与电气特性
| Core Architecture | ARM Cortex-M0+ (32-bit, single-core) |
| Family / Series | SAM C21, Functional Safety (FuSa) |
| Maximum CPU Clock | 48 MHz |
| Flash Memory | 256 KB (in-system self-programmable) |
| SRAM | 32 KB |
| EEPROM Emulation Area | 8 KB independent self-programmable Flash block |
| 电源电压 | 2.7 V to 5.5 V (5 V-tolerant I/O) |
| 工作温度 | -40 C to +105 C |
| 封装 | 64-pin TQFP, 10x10 mm |
| 安装类型 | Surface Mount, Tape & Reel (-ANT) |
| Communication Peripherals | CAN-FD, USB 2.0 FS device, 6x SERCOM (UART/SPI/I2C) |
| Analog | 12-bit ADC (up to 16 channels), 2x analog comparators, PTC |
| Hardware Multiplier | Single-cycle (32-bit result) |
| Memory Protection Unit (MPU) | Yes |
| Debug Interface | SWD + Micro Trace Buffer |
| RoHS 状态 | Compliant |
ATSAMC21J18A-ANT 引脚配置
| 引脚 1 | VDDIN — Main supply input (2.7 V to 5.5 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | AVDD — Analog supply, decouple to GND |
| 引脚 4 | PA00 — GPIO / SERCOM alt |
| 引脚 5 | PA01 — GPIO / SERCOM alt |
| 引脚 6 | PA02 — GPIO / analog input |
| 引脚 7 | PA03 — GPIO / analog input |
| 引脚 8 | PA04 — GPIO / ADC input |
| 引脚 9 | PA05 — GPIO / ADC input |
| 引脚 10 | PA06 — GPIO / SERCOM alt |
| 引脚 11 | PA07 — GPIO / SERCOM alt |
| 引脚 12 | PA08 — GPIO / SERCOM alt |
| 引脚 13 | PA09 — GPIO / SERCOM alt |
| 引脚 14 | PA10 — GPIO / SERCOM alt |
| 引脚 15 | PA11 — GPIO / SERCOM alt |
| 引脚 16 | PA12 — GPIO / SERCOM alt |
| 引脚 17 | PA13 — GPIO / PTC channel |
| 引脚 18 | PA14 — GPIO / PTC channel |
| 引脚 19 | PA15 — GPIO / PTC channel |
| 引脚 20 | PA16 — GPIO / SERCOM alt |
| 引脚 21 | PA17 — GPIO / SERCOM alt |
| 引脚 22 | PA18 — GPIO / SERCOM alt |
| 引脚 23 | PA19 — GPIO / SERCOM alt |
| 引脚 24 | PA20 — GPIO / SERCOM alt |
| 引脚 25 | PA21 — GPIO / SERCOM alt |
| 引脚 26 | PA22 — GPIO / SERCOM alt |
| 引脚 27 | PA23 — GPIO / SERCOM alt |
| 引脚 28 | PA24 — GPIO / SERCOM alt |
| 引脚 29 | PA25 — GPIO / SERCOM alt |
| 引脚 30 | PA26 — GPIO / analog input |
| 引脚 31 | PA27 — GPIO / analog input |
| 引脚 32 | PA28 — GPIO / analog input |
| 引脚 33 | PA29 — GPIO / analog input |
| 引脚 34 | PA30 — GPIO / SERCOM alt |
| 引脚 35 | PA31 — GPIO / SERCOM alt |
| 引脚 36 | PB00 — GPIO / SERCOM alt |
| 引脚 37 | PB01 — GPIO / SERCOM alt |
| 引脚 38 | PB02 — GPIO / SERCOM alt |
| 引脚 39 | PB03 — GPIO / SERCOM alt |
| 引脚 40 | PB04 — GPIO / SERCOM alt |
| 引脚 41 | PB05 — GPIO / SERCOM alt |
| 引脚 42 | PB06 — GPIO / SERCOM alt |
| 引脚 43 | PB07 — GPIO / SERCOM alt |
| 引脚 44 | PB08 — GPIO / SERCOM alt |
| 引脚 45 | PB09 — GPIO / SERCOM alt |
| 引脚 46 | PB10 — GPIO / SERCOM alt |
| 引脚 47 | PB11 — GPIO / SERCOM alt |
| 引脚 48 | PB12 — GPIO / SERCOM alt |
| 引脚 49 | PB13 — GPIO / SERCOM alt |
| 引脚 50 | PB14 — GPIO / SERCOM alt |
| 引脚 51 | PB15 — GPIO / SERCOM alt |
| 引脚 52 | PB16 — GPIO / SERCOM alt |
| 引脚 53 | PB17 — GPIO / SERCOM alt |
| 引脚 54 | PB18 — GPIO / SERCOM alt |
| 引脚 55 | PB19 — GPIO / SERCOM alt |
| 引脚 56 | PB20 — GPIO / SERCOM alt |
| 引脚 57 | PB21 — GPIO / SERCOM alt |
| 引脚 58 | VBAT — RTC and backup domain supply |
| 引脚 59 | GND — Ground |
| 引脚 60 | VDDO — I/O supply reference |
| 引脚 61 | RESET — Reset input, active low |
| 引脚 62 | SWDIO — SWD data (debug) |
| 引脚 63 | SWCLK — SWD clock (debug) |
| 引脚 64 | NC — Not connected (per datasheet) |
典型应用
ATSAMC21J18A-ANT 适用于 6 应用s: Industrial CAN-FD Sensor Node, Building Automation Controller, USB-CDC Human Interface Device, 5V Industrial Motor-Control Front End, Touch-Key Human-Machine Interface Panel, IIoT Edge Sensor Gateway.
Industrial CAN-FD Sensor Node
The ATSAMC21J18A-ANT fits industrial CAN-FD sensor nodes because of its integrated ISO 11898-1:2015 CAN-FD controller, 5V-tolerant I/O for direct connection to 24V backplane-derived rails via simple regulators, and 256 KB Flash for protocol stacks plus field-upgradeable firmware. Designers typically place the MCU between a 5V LDO and a CAN-FD transceiver such as the MCP2562FD, with a 10uF+100nF decoupling network at VDDIN. The 48 MHz Cortex-M0+ clock yields deterministic CAN-FD throughput up to 1 Mbit/s arbitration and typical data-phase bit rates around 2 Mbit/s, while the 32 KB SRAM comfortably holds the CAN-FD mailbox buffer plus the application stack without jitter.
推荐
Building Automation Controller
The ATSAMC21J18A-ANT is well suited to building automation controllers (HVAC, lighting, access) because the 5V-tolerant I/O talks directly to 24V-mapped relay drivers and triac optocouplers, and the CAN-FD plus USB FS simplify bridging between fieldbus networks and the commissioning laptop. The Peripheral Touch Controller (PTC) supports projected-capacitive touch keypads behind 5 mm plastic, eliminating mechanical buttons. Most designs run the MCU from a 5V rail with the internal VDDCORE LDO handling 1.8V core, freeing PCB area, and the 256 KB Flash holds BACnet or Modbus stacks with room for over-the-air update partitions.
推荐
USB-CDC Human Interface Device
USB-CDC HID-class peripherals are an ideal application for the ATSAMC21J18A-ANT because of its on-chip USB 2.0 Full-Speed device controller with internal pull-up and D+/D- pads, 256 KB Flash for composite descriptors, and the Cortex-M0+ core fast enough to handle HID report generation without DMA. The device enumerates with no external crystal when paired with the 48 MHz PLL on the internal 16 MHz DFLL, simplifying BOM cost. Typical 5V-rail products use the ATSAMC21J18A-ANT over the ATSAMD21 series for better noise tolerance on industrial USB ports.
推荐
5V Industrial Motor-Control Front End
For 5V industrial motor-control front-end boards that precede a discrete three-phase gate driver, the ATSAMC21J18A-ANT provides six high-speed SERCOM channels for SPI encoder and resolver feedback, dual analog comparators for over-current protection, and a 12-bit ADC with up to 16 channels for back-EMF sampling. The 5V-tolerant I/Os drive the isolated gate driver through optocouplers without a level translator. The 32 KB SRAM absorbs the field-oriented control (FOC) math plus space-vector PWM state, and the 48 MHz core cycles the FOC loop comfortably at 10 kHz with headroom for housekeeping.
推荐
Touch-Key Human-Machine Interface Panel
The Peripheral Touch Controller (PTC) on the ATSAMC21J18A-ANT handles projected-capacitive touch buttons or sliders, replacing up to 20 mechanical switches with a single MCU plus a scan header. The 256 KB Flash fits Microchip's QTouch library and a custom UI overlay, while CAN-FD links the panel to the controller. Designers commonly use the device at 5V rail to share ground with industrial LED drivers, and the -40C to +105C temperature grade supports outdoor panels and refrigerated enclosures.
推荐
IIoT Edge Sensor Gateway
The ATSAMC21J18A-ANT is well matched to IIoT edge gateways that pre-process CAN-FD sensor traffic before forwarding over USB or SERCOM to a higher-tier gateway. The 5V supply rail is common in factory cabinets, and the 256 KB Flash runs TLS plus a lightweight MQTT-SN or OPC-UA stack. The 32 KB SRAM holds rolling buffers of sensor frames, and the Cortex-M0+ provides enough cycles to encrypt outbound frames with hardware-accelerated AES, which is implemented in software library on this device. Pin-compatibility with the smaller SAM C20 parts gives designers a clean 48 MHz Cortex-M0+ migration path.
推荐
推荐产品汇总
工程参考数据： ATSAMC21J18A-ANT ——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 | ATSAMC21J17A-ANT | ATSAMC21J15A-ANT | ATSAMC20J18A-ANT | ATSAMC20J18A-AUT | ATSAMC21J18A-AUT |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 128 KB | smaller (J15 step) | 256 KB (same) | 256 KB (same) | 256 KB (same) |
| SRAM | 32 KB | 32 KB (same) | varies by sub-family | 32 KB (same) | 32 KB (same) | 32 KB (same) |
| CAN-FD | Yes | Yes | Yes | No | No | Yes |
| USB 2.0 FS | Yes | Yes | Yes | No | No | Yes |
| Automotive Grade (AEC-Q100) | No (industrial) | No (industrial) | No (industrial) | No (industrial) | Yes (AEC-Q100) | Yes (AEC-Q100) |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +125 C (AEC-Q100 Grade 1) | -40 C to +125 C (AEC-Q100 Grade 1) |
关键差异点
- Largest Flash option in SAM C21 TQFP-64 line （对比 ATSAMC21J17A-ANT)
- Adds CAN-FD and USB FS on top of SAM C20 peripherals （对比 ATSAMC20J18A-ANT)
- Same silicon as the AEC-Q100 automotive grade （对比 ATSAMC21J18A-AUT)
设计说明
Estimated: Power dissipation with all peripherals running at 48 MHz and 5V supply is around 30 mW typical. Add bulk capacitance of 10 uF+100 nF directly at VDDIN (pin 1) and a similar network at VDDCORE; the internal LDO can be over-stressed by hot-plug events if bulk capacitance is missing. Reset the BOD threshold (BOD12 vs BOD33) appropriately for 5V rails to avoid spurious resets during 24V backplane dips below 5V.
Keep the CAN-FD transceiver and its differential pair as close as possible to the PB15/PB16 (CANTX/CANRX) pads to avoid reflections; route the bus with 120 ohm characteristic impedance and place a 120 ohm termination only at the two ends of the bus. The USB DP/DM traces must be 90 ohm differential with no stubs; keep them on top layer with a continuous ground reference plane underneath.
Do not exceed the 5.5 V abs-max rating on VDDIN; the device is 5V-tolerant on I/O but the supply rail itself has the same 5.5 V limit. The 8 KB EEPROM-emulation Flash block has its own lock bits and should be wear-leveled explicitly if used as a non-volatile store. When upgrading from SAM C20 to SAM C21 silicon, double-check Peripheral Touch Controller (PTC) channel mapping, as it differs between the two sub-families despite the same physical pins.
合规信息
RoHS and REACH compliant per Microchip product page. Standard -ANT variant is industrial grade only; choose ATSAMC21J18A-AUT for AEC-Q100 Grade 1 automotive qualification.
