ATSAMD21E15B-AU - 32KB Flash ARM Cortex-M0+ MCU | Microchip
料号： ATSAMD21E15B-AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.21 | $221.00 |
| 500 | $1.94 | $970.00 |
| 1,000 | $1.72 | $1,720.00 |
| 3,000 | $1.45 | $4,350.00 |
ATSAMD21E15B-AU 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory, and programmable I/O peripherals. Within the broader semiconductor hierarchy, the ATSAMD21E15B-AU belongs to the ARM Cortex-M0+ class of microcontrollers, which are designed for energy-efficient 32-bit computing in cost-sensitive applications. The SAM D21 series extends Cortex-M0+ with Microchip's Event System, SERCOM peripherals, and full-speed USB support on selected variants.
Key differentiating features include a 12-channel 350 µs minimum sample time 12-bit ADC, up to 26 GPIO lines, and six SERCOM interfaces that can each be configured as UART, I²C, or SPI. The integrated Event System allows peripherals to communicate without CPU intervention, reducing active time and current draw. SleepWalking peripherals continue to monitor external events while the CPU sleeps, achieving standby currents measured in microamperes.
Architecturally, the ATSAMD21E15B-AU uses a single-cycle hardware multiplier and a Nested Vector Interrupt Controller (NVIC) to deliver deterministic interrupt response. The advanced analog peripherals, including a 10-bit DAC and two analog comparators, make it suitable for sensor signal conditioning. The on-chip Full-Speed USB 2.0 device interface (selected variants) simplifies connectivity for hardware peripherals.
Typical applications include IoT sensor nodes, home automation controllers, wearable fitness bands, USB human-interface devices, and industrial control subsystems. The combination of low power, USB connectivity, and capacitive touch support makes it popular in consumer electronics and connected home products.
When designing with this MCU, allocate sufficient decoupling capacitance near each VDD pin and route the SWD signals (SWDIO/SWDCLK) as short as possible for reliable debug. The on-chip 32.768 kHz oscillator should be configured for low-power RTC modes. Verify the specific variant's peripheral count against your BOM requirements.
直接替换替代料： ATSAMD21E15B-AU ——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： ATSAMD21E15B-AU （相同外形与封装尺寸） ——差异在于 ADC, Package, Operating Temperature, RoHS Status, Core Architecture.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21E15B-AUT
✅ 直接替换✓ 有现货
$1.4 / 个
查看数据手册 →ATSAMD21E15A-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21E15B-MU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAMD21E16B-AU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.1 / 个
查看数据手册 →ATSAMD20E15B-AUT
✅ 直接替换✓ 有现货
$2.52 / 个
查看数据手册 →ATSAMD21E15B-AFT
✅ 直接替换✓ 有现货
$1.96 / 个
查看数据手册 →ATSAMD21E15B-AU 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 | 32 KB |
| SRAM | 4 KB |
| 电源电压 | 1.62 V to 3.6 V (3.3 V nominal) |
| 工作温度 | -40 °C to +85 °C (industrial) |
| 封装 | 32-pin TQFP |
| GPIO Count | Up to 26 |
| ADC | 12-bit, 20 channels |
| DAC | 10-bit, 1 channel |
| SERCOM | 6 configurable (UART/SPI/I²C) |
| Timers/Counters | TC x6, TCC x2 |
| Analog Comparators | 2 |
| RTC | Yes (32.768 kHz) |
| Programming Interface | Serial Wire Debug (SWD) |
| RoHS 状态 | Compliant |
ATSAMD21E15B-AU 引脚配置
| 引脚 1 | PA00 — General-purpose I/O, ADC input |
| 引脚 2 | PA01 — General-purpose I/O, ADC input |
| 引脚 3 | PA02 — General-purpose I/O, ADC input, DAC output |
| 引脚 4 | PA03 — General-purpose I/O, ADC input, analog comparator |
| 引脚 5 | PA04 — General-purpose I/O, ADC input, VREFA |
| 引脚 6 | PA05 — General-purpose I/O, ADC input, VREFB |
| 引脚 7 | PA06 — General-purpose I/O, ADC input |
| 引脚 8 | PA07 — General-purpose I/O, ADC input |
| 引脚 9 | VDD — Digital supply voltage |
| 引脚 10 | GND — Ground |
| 引脚 11 | PA08 — General-purpose I/O, NMI |
| 引脚 12 | PA09 — General-purpose I/O |
| 引脚 13 | PA10 — General-purpose I/O |
| 引脚 14 | PA11 — General-purpose I/O |
| 引脚 15 | PA14 — General-purpose I/O, SWDIO |
| 引脚 16 | PA15 — General-purpose I/O |
| 引脚 17 | PA16 — General-purpose I/O |
| 引脚 18 | PA17 — General-purpose I/O |
| 引脚 19 | PA18 — General-purpose I/O |
| 引脚 20 | PA19 — General-purpose I/O |
| 引脚 21 | PA20 — General-purpose I/O |
| 引脚 22 | PA21 — General-purpose I/O, SERCOM |
| 引脚 23 | PA22 — General-purpose I/O, SERCOM |
| 引脚 24 | PA23 — General-purpose I/O, SERCOM |
| 引脚 25 | PA24 — General-purpose I/O |
| 引脚 26 | PA25 — General-purpose I/O, SWDCLK |
| 引脚 27 | PA27 — General-purpose I/O |
| 引脚 28 | PA28 — General-purpose I/O, RESET |
| 引脚 29 | PB00 — General-purpose I/O |
| 引脚 30 | PB01 — General-purpose I/O |
| 引脚 31 | PB02 — General-purpose I/O, ADC input |
| 引脚 32 | PB03 — General-purpose I/O, ADC input |
典型应用
ATSAMD21E15B-AU 适用于 7 应用s: IoT Sensor Nodes, USB Human Interface Devices, Home Automation Controllers, Wearable Fitness Bands, Industrial Control Subsystems, Capacitive Touch User Interfaces, Educational and Maker Boards.
IoT Sensor Nodes
The ATSAMD21E15B-AU fits IoT sensor node designs through its 48 MHz Cortex-M0+ core and 4KB SRAM that comfortably run wireless stacks and sensor-fusion tasks. The 12-bit ADC with 20 channels interfaces directly with analog temperature, humidity, and gas sensors without external converters. SleepWalking peripherals allow the MCU to wake only when a meaningful sensor event occurs, extending coin-cell battery life to years. Compared to discrete 8-bit MCU designs, the integrated SERCOM blocks reduce PCB footprint by eliminating external UART/I²C expanders, making it ideal for sub-1GHz wireless sensor motes.
推荐
USB Human Interface Devices
For USB HID peripherals such as keyboards, mice, and game controllers, the ATSAMD21E15B-AU (in the USB-capable -MU/-CU suffix variants) integrates a Full-Speed USB 2.0 device controller with on-chip transceivers. The 48 MHz Cortex-M0+ executes HID report generation with negligible latency, while six SERCOM blocks handle additional I/O for mechanical switches, encoders, or RGB lighting. Compared to external USB controller chips, the integrated peripheral saves BOM cost and PCB area, ideal for low-cost consumer peripherals.
推荐
Home Automation Controllers
The ATSAMD21E15B-AU is well-suited for home automation hubs where multiple communication protocols must coexist. Six SERCOM interfaces can simultaneously drive RS-485 for Modbus, SPI for an external display controller, I²C for sensors, and UART for debug logging without CPU overhead. The 12-bit ADC monitors battery or supply voltage rails for predictive maintenance, while the Event System routes peripheral-to-peripheral signals at hardware speed. With 32KB Flash, designers can implement Zigbee or Matter protocol stacks with room for application-layer customization.
推荐
Wearable Fitness Bands
For wearable fitness trackers, the ATSAMD21E15B-AU delivers the energy efficiency required for multi-day battery life. SleepWalking peripherals monitor accelerometer interrupts while the CPU stays in standby, drawing only single-digit microamps. The Cortex-M0+ core wakes in microseconds to update OLED displays and BLE radio modules. Compared to larger Cortex-M4 alternatives, the ATSAMD21E15B-AU's compact 32-pin TQFP enables ultra-thin wearable form factors without sacrificing analog performance for heart-rate sensing.
推荐
Industrial Control Subsystems
In industrial control systems, the ATSAMD21E15B-AU provides deterministic interrupt response through its NVIC and SERCOM peripherals that handle multi-protocol field-bus communication. The industrial -40 °C to +85 °C temperature range covers most factory-floor environments, and the 12-bit ADC reads 4-20 mA loop signals directly. The integrated Event System enables safety-critical interlocks without CPU latency, satisfying real-time control requirements. Compared to discrete PLC logic, this MCU reduces cost while maintaining deterministic behaviour for motor-control and process-control subsystems.
推荐
Capacitive Touch User Interfaces
The ATSAMD21E15B-AU supports capacitive touch buttons, sliders, and wheels through its built-in Peripheral Touch Controller (PTC). The PTC handles electrode scanning in hardware, freeing the Cortex-M0+ to manage communication tasks. With up to 26 GPIO-capable pins, designers can implement 10+ touch zones in a single MCU. Compared to dedicated touch ICs, integrating the PTC reduces BOM and PCB complexity for kitchen appliances, IoT switches, and consumer electronics that benefit from sealed, glass-fronted interfaces.
推荐
Educational and Maker Boards
The ATSAMD21E15B-AU is widely deployed on Arduino-compatible boards and SparkFun development kits because of its accessible Cortex-M0+ core and rich peripherals. With 32KB Flash and 4KB SRAM, it handles beginner-level sketches, real-time operating systems, and Bluetooth Low Energy stacks. The integrated Serial Wire Debug interface supports plug-and-play programming through Atmel Studio, PlatformIO, and Arduino IDE. Compared to legacy 8-bit AVR MCUs, this MCU brings 32-bit performance and modern peripherals to maker and educational applications.
推荐
推荐产品汇总
工程参考数据： ATSAMD21E15B-AU ——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 | ATSAMD21E15B-AUT | ATSAMD21E15A-AU | ATSAMD20E15B-AU |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-pin TQFP | 32-pin TQFP - same | 32-pin TQFP - same | 32-pin TQFP - same |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 10-bit |
| USB Support | No (base variant) | No | No | No |
| Event System | Yes | Yes | Yes | No |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
关键差异点
- Integrated Event System hardware routing （对比 ATSAMD20E15B-AU)
- Higher-resolution 12-bit ADC vs 10-bit on D20 family （对比 ATSAMD20E15B-AU)
- Lower active current with SleepWalking peripherals （对比 ATSAMD21E15B-AU vs larger Cortex-M4 MCUs)
设计说明
Place 100 nF decoupling capacitors as close as possible to every VDD pin and a bulk 10 µF capacitor near the package supply entry. The ATSAMD21E15B-AU supports separate VDDANA and VDDIO supply rails; tying them together via ferrite beads improves noise isolation for the analog ADC reference. According to the SAM D21 datasheet, configuring the on-chip voltage regulator's low-dropout mode reduces quiescent current to single-digit microamps in standby.
Route the SWDIO and SWDCLK traces with ground shielding and avoid crossing noisy signal paths. The 32-pin TQFP package supports 0.8 mm pitch routing on a 4-layer PCB with continuous ground plane beneath the device. Per Microchip layout guidelines, keep crystal traces short and symmetric to the GND plane to minimize oscillator start-up jitter and EMI.
Do not program the NMI pin (PA08) without considering its alternate function - leaving it floating can cause unexpected wake events. The 32.768 kHz external crystal requires proper load capacitor selection per the crystal vendor's CL specification; typical values are 12 pF. Ensure NVMCTRL locked regions are unlocked before any flash erase operation to prevent silent programming failures during firmware updates.
When using the SERCOM blocks for high-speed SPI above 12 MHz, add series source termination resistors near the MCU output pins to dampen reflections on long PCB traces. For I²C buses, use external 4.7 kΩ pull-ups rather than relying on weak internal pull-ups, especially when multiple slaves are connected. The 12-bit ADC's input impedance requires careful source-impedance budgeting; a 1 kΩ external series resistor with 10 nF input capacitance forms a suitable anti-alias filter.
合规信息
RoHS and REACH compliance per product page. Not AEC-Q100 qualified in this suffix; automotive variants (-AN/-AUT) are AEC-Q100 Grade 1 qualified.
