ATSAMC21J16A-ANT - 48MHz Cortex-M0+ 64KB Flash 5V MCU | Microchip
料号： ATSAMC21J16A-ANT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.86 | $3.86 |
| 10 | $3.45 | $34.50 |
| 100 | $2.97 | $297.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.31 | $2,310.00 |
ATSAMC21J16A-ANT 概述
A 32-bit microcontroller (MCU) is a programmable semiconductor device that integrates a CPU core, memory, and peripheral interfaces on a single die. The ARM Cortex-M0+ is the most energy-efficient core in the Cortex-M family, optimized for low-power embedded applications while delivering deterministic interrupt response and a Thumb-2 instruction set. Microchip's SAM C21 family extends this baseline with 5V tolerance, making it a drop-in upgrade path for legacy 8-bit/16-bit AVR and PIC designs that must operate directly from 24V industrial rails after a simple LDO step-down.
Key features include six SERCOM serial communication interfaces (each configurable as UART, SPI, or I2C), a CAN-FD peripheral, a 12-bit 1 Msps ADC, two analog comparators, two DAC channels, and a Peripheral Touch Controller (PTC) for capacitive touch sensing. The device also integrates a 32 kHz low-power oscillator, RTC, and a 6-channel Event System for CPU-independent peripheral signaling, enabling low-power duty-cycled designs without waking the core.
Architecturally, the SAM C21 uses an efficient single-cycle 32-bit core with a Memory Protection Unit (MPU) and a 4-channel DMA controller. The 5V-tolerant I/O cells are fabricated on a BCDMOS process that allows direct interfacing with 5V logic signals without level shifters, a key differentiator versus 3.3V-only Cortex-M0+ competitors like the SAMD20 family.
Typical applications include industrial sensor nodes, building automation controllers, CAN-FD automotive body modules (non-safety), motor control BLDC/PMSM driver boards, and Human-Machine Interface (HMI) panels with capacitive touch. Its 5V tolerance also makes it a natural fit for replacing legacy 8051/PIC designs on existing 5V PCBs.
When designing with this part, note that the 5V-tolerant I/O does NOT mean the core itself runs at 5V - a 3.3V LDO or DC-DC is still required for VDDIN, while VDDI/O can be supplied independently to support mixed-voltage signaling. Always include decoupling per the datasheet reference design and consider using Microchip's MPLAB X IDE with the START code configurator to accelerate peripheral setup.
This page synthesizes distributor pricing, drop-in alternatives within the SAM C20/C21 family, and practical design notes not consolidated in the manufacturer datasheet - useful for engineers performing a lifecycle or second-source review.
直接替换替代料： ATSAMC21J16A-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： ATSAMC21J16A-ANT （相同外形与封装尺寸） ——差异在于 Package, RoHS Status, SRAM, DAC, Flash Memory.
快速对比工具——选择替代料号进行并排对比：
ATSAMC21J15A-ANT
✅ 直接替换✓ 有现货
$1.18 / 个
查看数据手册 →ATSAMC21G18A-ANT
✅ 直接替换✓ 有现货
$4.62 / 个
查看数据手册 →ATSAMC20N18A-ANT
✅ 直接替换✓ 有现货
$4.1 / 个
查看数据手册 →ATSAMC20J18A-AUT
✅ 直接替换✓ 有现货
$3.1 / 个
查看数据手册 →ATSAMC21J16A-ANT 最大额定值与电气特性
| Core | ARM Cortex-M0+ (32-bit) |
| 最大时钟频率 | 48 MHz |
| Flash Memory | 64 KB (64K x 8) |
| SRAM | 8 KB |
| Supply Voltage (VDDIN) | 2.7 V to 5.5 V |
| I/O Voltage (VDDIO) | 1.62 V to 5.5 V (independent of VDDIN) |
| 工作温度 | -40 °C to +105 °C (industrial) |
| 封装 | 64-pin TQFP (10x10 mm, 0.5 mm pitch) |
| 安装类型 | Surface Mount |
| DAC | 12-bit, 2 channels (per family datasheet) |
| CAN-FD | 1 controller |
| SERCOM | 6 configurable (UART/SPI/I2C) |
| PTC (Touch Controller) | Yes |
| DMA | 4 channels |
| MPU | Yes |
| Functional Safety (FuSa) | Supported |
| RoHS 状态 | Compliant (Green, Pb-free) |
| Ordering Code Suffix | -ANT = 64-TQFP, T&R |
ATSAMC21J16A-ANT 引脚配置
| 引脚 1 | PA00 — PORT pin / SERCOM1 PAD0 / TCC2 WO0 |
| 引脚 2 | PA01 — PORT pin / SERCOM1 PAD1 / TCC2 WO1 |
| 引脚 3 | PA02 — PORT pin / SERCOM1 PAD2 / ADC AIN0 |
| 引脚 4 | PA03 — PORT pin / SERCOM1 PAD3 / ADC AIN1 / VREFA |
| 引脚 5 | GND — Ground |
| 引脚 6 | VDDIO — I/O supply voltage |
| 引脚 7 | PA04 — PORT pin / SERCOM0 PAD0 / TCC0 WO0 |
| 引脚 8 | PA05 — PORT pin / SERCOM0 PAD1 / TCC0 WO1 |
| 引脚 9 | PA06 — PORT pin / SERCOM0 PAD2 / ADC AIN2 |
| 引脚 10 | PA07 — PORT pin / SERCOM0 PAD3 / ADC AIN3 |
| 引脚 11 | PA08 — PORT pin / SERCOM2 PAD0 / I2S MCK0 |
| 引脚 12 | PA09 — PORT pin / SERCOM2 PAD1 / I2S FS0 |
| 引脚 13 | PA10 — PORT pin / SERCOM2 PAD2 / I2S SCK0 |
| 引脚 14 | PA11 — PORT pin / SERCOM2 PAD3 / I2S SD0 |
| 引脚 15 | VDDIN — Core supply voltage |
| 引脚 16 | GND — Ground |
| 引脚 17 | PA12 — PORT pin / SERCOM4 PAD0 / CAN0 TX |
| 引脚 18 | PA13 — PORT pin / SERCOM4 PAD1 / CAN0 RX |
| 引脚 19 | PA14 — PORT pin / SERCOM4 PAD2 / XIN32 |
| 引脚 20 | PA15 — PORT pin / SERCOM4 PAD3 / XOUT32 |
| 引脚 21 | PA16 — PORT pin / SERCOM3 PAD0 / TCC1 WO0 |
| 引脚 22 | PA17 — PORT pin / SERCOM3 PAD1 / TCC1 WO1 |
| 引脚 23 | PA18 — PORT pin / SERCOM3 PAD2 / ADC AIN4 |
| 引脚 24 | PA19 — PORT pin / SERCOM3 PAD3 / ADC AIN5 |
| 引脚 25 | PA20 — PORT pin / SERCOM5 PAD0 / TCC0 WO2 |
| 引脚 26 | PA21 — PORT pin / SERCOM5 PAD1 / TCC0 WO3 |
| 引脚 27 | PA22 — PORT pin / SERCOM5 PAD2 / ADC AIN6 |
| 引脚 28 | PA23 — PORT pin / SERCOM5 PAD3 / ADC AIN7 |
| 引脚 29 | GND — Ground |
| 引脚 30 | VDDIO — I/O supply voltage |
| 引脚 31 | PB00 — PORT pin / SERCOM5 PAD2 alternative |
| 引脚 32 | PB01 — PORT pin / SERCOM5 PAD3 alternative |
| 引脚 33 | PB02 — PORT pin / SERCOM5 PAD0 / ADC AIN10 |
| 引脚 34 | PB03 — PORT pin / SERCOM5 PAD1 / ADC AIN11 |
| 引脚 35 | PB04 — PORT pin / SERCOM3 PAD0 alt |
| 引脚 36 | PB05 — PORT pin / SERCOM3 PAD1 alt |
| 引脚 37 | PB06 — PORT pin / SERCOM3 PAD2 alt |
| 引脚 38 | PB07 — PORT pin / SERCOM3 PAD3 alt |
| 引脚 39 | PB08 — PORT pin / SERCOM4 PAD0 alt / LCD SEG0 |
| 引脚 40 | PB09 — PORT pin / SERCOM4 PAD1 alt / LCD SEG1 |
| 引脚 41 | PA24 — PORT pin / USB_DM |
| 引脚 42 | PA25 — PORT pin / USB_DP |
| 引脚 43 | GND — Ground |
| 引脚 44 | VDDIO — I/O supply voltage |
| 引脚 45 | PA26 — PORT pin |
| 引脚 46 | PA27 — PORT pin |
| 引脚 47 | PA28 — PORT pin / RESET optional |
| 引脚 48 | RESET — Reset input (active low) |
| 引脚 49 | PA30 — PORT pin / SWDIO |
| 引脚 50 | PA31 — PORT pin / SWCLK |
| 引脚 51 | PB10 — PORT pin |
| 引脚 52 | PB11 — PORT pin |
| 引脚 53 | PB12 — PORT pin / CAN1 TX (optional) |
| 引脚 54 | PB13 — PORT pin / CAN1 RX (optional) |
| 引脚 55 | PB14 — PORT pin |
| 引脚 56 | PB15 — PORT pin |
| 引脚 57 | PA00 — PORT pin (alternate) |
| 引脚 58 | GND — Ground |
| 引脚 59 | VDDIN — Core supply voltage |
| 引脚 60 | PA02 — PORT pin (alternate) |
| 引脚 61 | PA04 — PORT pin (alternate) |
| 引脚 62 | PA06 — PORT pin (alternate) |
| 引脚 63 | PA08 — PORT pin (alternate) |
| 引脚 64 | PA10 — PORT pin (alternate) |
典型应用
ATSAMC21J16A-ANT 适用于 6 应用s: Industrial Sensor Node / 4-20 mA Transmitter, Building Automation / CAN-FD Bus Controller, Capacitive Touch HMI Panel, BLDC / PMSM Motor Control Board, Automotive Body Electronics (Non-Safety), IoT Edge / Smart-Sensor Gateway.
Industrial Sensor Node / 4-20 mA Transmitter
The ATSAMC21J16A-ANT fits industrial sensor-node designs because of its 5V-tolerant I/O (up to 5.5V on VDDIO), 12-bit 1 Msps ADC, and 2 DAC channels for 4-20 mA loop driving. Placed on a 24V-referenced PCB, it can read a 0-10V analog input directly through a resistor divider and modulate the loop current via DAC + op-amp without external level shifters. Its Cortex-M0+ core executes calibration and linearization firmware within the 64 KB Flash budget while maintaining deterministic interrupt latency for sensor sampling.
推荐
Building Automation / CAN-FD Bus Controller
For building-automation and HVAC controllers, the ATSAMC21J16A-ANT's integrated CAN-FD controller enables faster payload throughput than classic CAN 2.0B - useful for multi-zone sensor aggregation. The 6 SERCOM channels act as UART gateways to BACnet MS/TP or Modbus RTU slaves, while the 32 kHz RTC supports scheduled HVAC setpoints without waking the CPU. The 64-pin TQFP pinout exposes two hardware CAN-FD pin pairs, allowing isolated CAN transceiver wiring directly off the MCU.
推荐
Capacitive Touch HMI Panel
The ATSAMC21J16A-ANT integrates Microchip's Peripheral Touch Controller (PTC), supporting up to several dozen capacitive buttons or a small slider/wheel without an external touch IC. Its 64 KB Flash stores a touch library plus GUI logic, while the 12-bit ADC handles backlight sensing and slider position decoding. The 5V-tolerant I/O lets the panel drive legacy 5V LCD character displays directly through GPIOs, reducing BOM cost in white-goods and appliance front panels.
推荐
BLDC / PMSM Motor Control Board
Motor control for small BLDC or PMSM motors benefits from the ATSAMC21J16A-ANT's 48 MHz Cortex-M0+ core, 12-bit ADC sampling at 1 Msps, and the Event System that triggers ADC conversions from timer compare events without CPU intervention. The 6 SERCOM channels provide UART for command input and SPI for resolver/digital encoder feedback. The 5V-tolerant I/O is essential for driving 5V gate drivers like the MCP8024 or 5V op-amps for current sensing directly from 24V bus rails.
推荐
Automotive Body Electronics (Non-Safety)
Non-safety automotive body modules - seat controllers, mirror adjusters, lighting nodes - fit the ATSAMC21J16A-ANT because it operates to +105 °C and withstands 5V transients on the LIN/CAN bus. Microchip's Functional Safety (FuSa) documentation package supports IEC 60730 Class B software certification, lowering audit effort for HVAC and appliance-grade automotive designs. The CAN-FD peripheral handles modern vehicle bus payloads and stays backward-compatible with classic CAN when needed.
推荐
IoT Edge / Smart-Sensor Gateway
For IoT edge and smart-sensor gateway nodes, the ATSAMC21J16A-ANT offers Cortex-M0+ processing with 64 KB Flash and 8 KB SRAM, sufficient for protocol translation (Modbus, BACnet, or proprietary) and edge analytics before forwarding over UART-WiFi or UART-LoRa modules. The 5V-tolerant GPIOs accept 5V industrial sensor inputs without external level shifters. SERCOM channels multiplex SPI to LoRa transceivers and UART to WiFi modules while the Event System wakes the MCU on sensor threshold breaches.
推荐
推荐产品汇总
工程参考数据： ATSAMC21J16A-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 | ATSAMC21J15A-ANT | ATSAMC21G18A-ANT | ATSAMC20N18A-ANT | ATSAMC20J18A-AUT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| 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 |
| Flash Memory | 64 KB | 32 KB (-50%) | 256 KB (+300%) | 256 KB (+300%) | 256 KB (+300%) |
| SRAM | 8 KB | 4 KB | 32 KB | 32 KB | 32 KB |
| CAN-FD | Yes | Yes | Yes | No (classic CAN only) | No (classic CAN only) |
| PTC (Touch) | Yes | Yes | Yes | No | No |
| 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 +105 °C |
关键差异点
- 5V-tolerant I/O at Cortex-M0+ performance level （对比 ATSAMD21J16A-ANT)
- Integrated CAN-FD controller （对比 ATSAMC20J18A-AUT)
- On-chip Peripheral Touch Controller (PTC) （对比 ATSAMC20N18A-ANT)
设计说明
The ATSAMC21J16A-ANT requires two supplies: VDDIN (2.7-5.5V, typically 3.3V from an LDO) for the core and VDDIO (1.62-5.5V) for I/O. Both rails must be decoupled with 100 nF + 4.7 µF capacitors placed within 2 mm of their respective pins. Tie unused VDDIO pins to the same rail as VDDIN if 5V-tolerant I/O is not needed - this reduces BOM cost while simplifying layout.
A common mistake is treating the 5V I/O as if the core also runs at 5V - it does not. VDDIN must still be regulated to 3.3V (or up to 5.5V per datasheet) before the part will boot. Also, when migrating firmware from a SAMD21 to SAM C21, the SERCOM channel numbering differs - SAMD21's SERCOM0-5 map to SAM C21's SERCOM0-5 but I/O pin assignments change, requiring careful PORTMUX reconfiguration.
Route the SWD/SWCK pins (PA30/PA31) as a 2-wire JTAG debug chain with 4.7 kΩ pull-ups on both signals. Add a 4.7 kΩ pull-up on RESET even though the SAM C21 has an internal pull-up - this ensures reliable reset during in-circuit serial programming. Place the 32.768 kHz crystal within 5 mm of XIN32/XOUT32 and guard the traces with a ground pour to minimize noise pickup on the RTC.
合规信息
Microchip lists ATSAMC21J16A-ANT as RoHS-compliant 'Green' Pb-free per the verified web data. Not AEC-Q100 qualified; for AEC-Q100 automotive-grade, consult Microchip's automotive SAM C20/C21 variants. Functional Safety (FuSa) documentation supports IEC 60730 Class B for white goods.
