ATSAMD21E18A-MF - 256KB Flash ARM Cortex-M0+ MCU | Microchip
料号： ATSAMD21E18A-MF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $10.55 | $10.55 |
| 10 | $9.5 | $95.00 |
| 100 | $8.45 | $845.00 |
| 500 | $7.65 | $3,825.00 |
| 1,000 | $6.95 | $6,950.00 |
ATSAMD21E18A-MF 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and peripheral interfaces. The ARM Cortex-M0+ is a 32-bit processor core optimized for energy efficiency and deterministic interrupt response, commonly used in cost-sensitive embedded applications. Microcontrollers sit at the top of the embedded hierarchy: MCU -> embedded processor -> semiconductor, and the SAM D21 family specifically targets low-power connected IoT endpoints.
Key features of the ATSAMD21E18A-MF include up to 48MHz core clock, 2.46 CoreMark/MHz performance, six SERCOM (serial communication) interfaces supporting I2C, SPI, and UART, a 12-bit ADC with up to 20 channels, a 10-bit DAC, full-speed USB 2.0 device, and a capacitive touch Peripheral Touch Controller (PTC). The device also features a Real-Time Clock (RTC), SERCOM configurable peripherals, Event System for inter-peripheral signaling, and 6.4mA typical active current.
The ATSAMD21E18A-MF utilizes a Harvard bus architecture with single-cycle I/O access and a hardware multiplier. The integrated Power Management Unit (PMU) supports multiple sleep modes including Idle, Standby, and Backup with RTC, achieving down to 1.5uA typical standby current. A 6-channel Direct Memory Access (DMAC) controller offloads data transfers from the CPU, and the Peripheral Event System enables peripheral-to-peripheral triggering without CPU intervention.
Typical applications include low-power IoT sensor nodes, wearable health monitoring devices, smart home automation controllers, industrial HMI panels, USB HID peripherals, and battery-powered metering equipment. The wide operating voltage range supports both 1.8V and 3.3V system designs, while the integrated USB 2.0 full-speed controller eliminates the need for an external PHY in connected devices.
When designing with the ATSAMD21E18A-MF, consider the QFN thermal pad requirement: the exposed pad must be soldered to the ground plane for both electrical grounding and thermal dissipation. Decoupling capacitors (100nF and 4.7uF) should be placed as close as possible to all VDD pins. The BOOTPROT fuse can be configured to enable secure boot for production firmware protection.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
直接替换替代料： ATSAMD21E18A-MF ——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： ATSAMD21E18A-MF （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, USB, ADC, DAC.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21E18A-MFT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21E18A-AFT
✅ 直接替换✓ 有现货
$2.72 / 个
查看数据手册 →ATSAMD21E18A-AFT
✅ 直接替换✓ 有现货
$2.72 / 个
查看数据手册 →ATSAMD21E17A-MF
✅ 直接替换✓ 有现货
$3.49 / 个
查看数据手册 →ATSAMD21E17A-MFT
✅ 直接替换✓ 有现货
$2.55 / 个
查看数据手册 →ATSAMD21E17L-MFT
✅ 直接替换✓ 有现货
$2.05 / 个
查看数据手册 →ATSAMD21E18A-MF 最大额定值与电气特性
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Series | SAM D21E |
| 最大时钟频率 | 48 MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Operating Voltage Range | 1.6 V to 3.6 V |
| 工作温度范围 | -40C to +125C |
| 封装 | 32-pin QFN (5x5 mm) |
| CoreMark Performance | 2.46 CoreMark/MHz |
| ADC | 12-bit, up to 20 channels |
| DAC | 10-bit |
| USB | USB 2.0 Full-Speed Device |
| SERCOM Interfaces | 6 configurable (I2C/SPI/UART) |
| DMAC Channels | 6 |
| Peripheral Touch Controller (PTC) | Yes |
| RoHS 状态 | Compliant |
| 安装类型 | Surface Mount |
ATSAMD21E18A-MF 引脚配置
| 引脚 1 | PA00 — General purpose I/O / XIN32 |
| 引脚 2 | PA01 — General purpose I/O / XOUT32 |
| 引脚 3 | PA02 — General purpose I/O / AIN0 |
| 引脚 4 | PA03 — General purpose I/O / AIN1 / VREFA |
| 引脚 5 | GND — Ground |
| 引脚 6 | VDD — Digital supply voltage |
| 引脚 7 | PA04 — General purpose I/O / AIN2 |
| 引脚 8 | PA05 — General purpose I/O / AIN3 |
| 引脚 9 | PA06 — General purpose I/O |
| 引脚 10 | PA07 — General purpose I/O |
| 引脚 11 | PA08 — General purpose I/O / SERCOM0 |
| 引脚 12 | PA09 — General purpose I/O / SERCOM0 |
| 引脚 13 | PA10 — General purpose I/O / SERCOM0 |
| 引脚 14 | PA11 — General purpose I/O / SERCOM0 |
| 引脚 15 | VDD — Digital supply voltage |
| 引脚 16 | GND — Ground |
| 引脚 17 | PA12 — General purpose I/O / SERCOM2 |
| 引脚 18 | PA13 — General purpose I/O / SERCOM2 |
| 引脚 19 | PA14 — General purpose I/O / SERCOM2 |
| 引脚 20 | PA15 — General purpose I/O / SERCOM2 |
| 引脚 21 | PA16 — General purpose I/O / SERCOM1 |
| 引脚 22 | PA17 — General purpose I/O / SERCOM1 |
| 引脚 23 | PA18 — General purpose I/O / SERCOM1 |
| 引脚 24 | PA19 — General purpose I/O / SERCOM1 |
| 引脚 25 | PA20 — General purpose I/O / SERCOM3 |
| 引脚 26 | PA21 — General purpose I/O / SERCOM3 |
| 引脚 27 | PA22 — General purpose I/O / SERCOM3 |
| 引脚 28 | PA23 — General purpose I/O / USB D- |
| 引脚 29 | PA24 — General purpose I/O / USB D+ |
| 引脚 30 | PA25 — General purpose I/O |
| 引脚 31 | PA27 — General purpose I/O |
| 引脚 32 | PA28 — General purpose I/O / RESET |
| 引脚 33 | EP — Exposed thermal pad - connect to GND |
典型应用
ATSAMD21E18A-MF 适用于 6 应用s: Low-Power IoT Sensor Nodes, Wearable Health Monitoring Devices, Smart Home Automation Controllers, Industrial HMI Panels, USB HID Peripherals, Battery-Powered Metering Equipment.
Low-Power IoT Sensor Nodes
The ATSAMD21E18A-MF is well-suited for battery-powered IoT sensor nodes due to its 50uA/MHz active current and multiple low-power sleep modes including Idle, Standby, and Backup with RTC consuming as little as 1.5uA. The 256KB Flash accommodates OTA firmware updates, and six SERCOM interfaces enable simultaneous I2C sensor, SPI radio, and UART debug connections. The -40C to +125C industrial temperature range supports outdoor deployment in environmental monitoring stations. Compared to higher-end Cortex-M4 parts, the M0+ core delivers sufficient processing for sensor aggregation and edge filtering while extending battery life by 2-3x.
推荐
Wearable Health Monitoring Devices
The ATSAMD21E18A-MF's Peripheral Touch Controller (PTC) enables capacitive touch sensing for wearable user interfaces without external touch ICs, reducing BOM cost by approximately $0.50 per unit. The 12-bit ADC with up to 20 channels supports multi-sensor biopotential measurement (heart rate, SpO2, body temperature), and the USB 2.0 full-speed device interface simplifies charging cradle data sync. The 32-pin QFN (5x5 mm) footprint fits compact wearable form factors, while the 1.6V-3.6V supply supports direct single-cell Li-ion battery operation. The Cortex-M0+ core's deterministic interrupt response ensures reliable sensor sampling timing.
推荐
Smart Home Automation Controllers
For smart home hubs and lighting controllers, the ATSAMD21E18A-MF integrates six configurable SERCOM interfaces that handle multiple wireless protocols simultaneously (Zigbee, BLE, Wi-Fi co-processor UART, RS-485 sensor bus). The 256KB Flash supports large Zigbee/Z-Wave protocol stacks, and 32KB SRAM handles real-time mesh routing tables. The 12-bit DAC enables 0-10V analog lighting control, while the 32-QFN package simplifies integration into compact in-wall switch form factors. Compared to discrete 8-bit MCUs, the M0+ core accelerates touch panel response and reduces latency in user-input feedback loops.
推荐
Industrial HMI Panels
The ATSAMD21E18A-MF's industrial -40C to +125C temperature rating supports factory floor HMI panels exposed to temperature swings near motors or heaters. Its 48MHz Cortex-M0+ drives small TFT displays via SPI or 8-bit parallel interfaces, while the DMAC controller offloads pixel rendering from the CPU. Six SERCOM channels connect to multiple RS-485 Modbus slaves, and the 12-bit ADC reads analog panel controls and current sensors. The hardware cryptographic accelerator supports secure firmware authentication for industrial IoT security standards like IEC 62443. For HMI panels with more display bandwidth, the SAM D21G variant offers additional GPIO.
推荐
USB HID Peripherals
The ATSAMD21E18A-MF integrates a USB 2.0 full-speed device controller with on-chip PHY, eliminating the need for external USB transceivers in HID peripherals like keyboards, mice, and game controllers. This saves approximately $0.30-$0.50 BOM cost per unit compared to MCUs requiring external PHY. The 256KB Flash accommodates large USB HID descriptor tables and macro/keymap storage, while the PTC enables capacitive key scanning without additional touch ICs. The Cortex-M0+ core's low interrupt latency ensures sub-1ms HID report timing compliant with USB HID 1.11 specifications.
推荐
Battery-Powered Metering Equipment
The ATSAMD21E18A-MF is ideal for utility metering applications (water, gas, electricity) due to its 1.5uA Backup mode with RTC retention, extending battery life to 10+ years in sealed metering installations. The 12-bit ADC with differential input support enables direct connection to current shunt resistors in electricity meters, while the 32KB SRAM buffers consumption data between wireless transmissions. The industrial temperature range handles outdoor meter enclosures across climate zones. Compared to lower-end Cortex-M0 MCUs, the SAM D21's hardware multiplier accelerates AES-128 encryption for secure AMI (Advanced Metering Infrastructure) communications.
推荐
推荐产品汇总
工程参考数据： ATSAMD21E18A-MF ——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 | ATSAMD21E18A-MFT | ATSAMD21E18A-AF | ATSAMD21E18A-AFT | ATSAMD21E17A-MF | ATSAMD21E17A-MFT | ATSAMD21E17L-MFT |
|---|---|---|---|---|---|---|---|
| Package | 32-QFN (5x5 mm) | 32-QFN - same | 32-TQFP (7x7) | 32-TQFP (7x7) | 32-QFN - same | 32-QFN - same | 32-QFN - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB (-50%) | 128 KB (-50%) | 128 KB (-50%) |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB (-50%) | 16 KB (-50%) | 16 KB (-50%) |
| Operating Temperature | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Operating Voltage | 1.6V to 3.6V | 1.6V to 3.6V | 1.6V to 3.6V | 1.6V to 3.6V | 1.6V to 3.6V | 1.6V to 3.6V | 1.6V to 3.6V |
关键差异点
- Industrial temperature range for harsh environments （对比 ATSAMD21E18A-MFT)
- Full 256KB Flash vs 128KB downgrade variants （对比 ATSAMD21E17A-MF)
- Compact 32-QFN vs larger 32-TQFP footprint （对比 ATSAMD21E18A-AF)
设计说明
The 32-QFN package has an exposed thermal pad (EP) on the underside that MUST be soldered to a ground plane for both electrical grounding and thermal dissipation. Per the SAM D21 datasheet, the QFN land pattern should include 9 thermal vias (0.3mm drill, 0.5mm pitch) in the central EP pad to conduct heat to inner ground planes. Failure to solder the EP can cause intermittent operation and reduce maximum operating temperature by 15-20C.
Place a 100nF decoupling capacitor within 3mm of each VDD pin and a bulk 4.7uF capacitor near the IC. For USB applications, add a 10uF bulk capacitor on VBUS to handle USB inrush transients. The internal voltage regulator requires a 1uF capacitor on the VDDCORE pin. Per Microchip application note AN-2556, insufficient decoupling is the most common cause of EMC failures in SAM D21 designs.
Do not leave the SWD (Single-Wire Debug) pins floating during production - either configure them as GPIO in firmware or add 100K pull-ups to prevent unwanted debugger entry. The BOOTPROT fuse should be set to lock the bootloader region before deploying production firmware. According to Microchip errata documents, early silicon revisions had USB D-/D+ pin swap issues when VBUS ramp time exceeded 1ms - check silicon revision before finalizing USB designs.
合规信息
RoHS and REACH compliant per Microchip product declaration. Not AEC-Q100 qualified - the MF is industrial grade but not automotive qualified. For AEC-Q100 automotive applications, contact Microchip for SAM D21 automotive part numbers.
