ATSAMD21E15B-AUT - 32KB Flash Cortex-M0+ MCU, 32-TQFP | Microchip
料号： ATSAMD21E15B-AUT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.55 | $25.50 |
| 100 | $2.2 | $220.00 |
| 500 | $1.9 | $950.00 |
| 1,000 | $1.62 | $1,620.00 |
| 3,000 | $1.4 | $4,200.00 |
ATSAMD21E15B-AUT 概述
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data memory, and integrated peripherals. The ARM Cortex-M0+ is a 32-bit processor core optimized for energy efficiency and deterministic interrupt response, commonly used in battery-powered IoT, sensor, and human-machine interface applications. The SAM D21 family extends this with Microchip's proprietary peripherals (SERCOM, Event System, TCC) that allow peripheral multiplexing across almost every GPIO.
Key differentiating features include a hardware Divide Square Root Accelerator (DIVAS), a SleepWalking peripheral event system that wakes the CPU only when necessary, and a 5-channel Direct Memory Access controller. According to the SAM D21 datasheet (40001882A), the device consumes 70 uA/MHz in Active mode and drops to under 5 uA in Sleep mode with full RAM retention, enabling multi-year battery life on coin-cell powered designs.
Architecture-wise, the SAM D21 uses a 2-layer AHB/APB bus matrix with tightly-coupled SRAM, providing deterministic single-cycle access for the Cortex-M0+ core. The integrated Full-Speed USB 2.0 transceiver eliminates the need for an external PHY, and the 12-channel Event System allows peripherals to communicate without CPU intervention, freeing the core for application logic. The 6 SERCOM blocks can each be configured as UART, SPI, or I2C, giving 18 logical communication channels in total.
Typical applications include USB human-interface devices, low-power wireless sensor nodes, industrial control modules, and consumer electronics such as remote controls and smart-home hubs. The device's combination of USB, ADC, DAC, and rich peripherals in a compact 32-pin package suits designs that previously required multiple external components.
When designing with this part, ensure the 1.62 V minimum supply is respected during DC-DC converter startup, and place the VDDCORE decoupling capacitor close to pin 5 to minimize core-rail transients. Configure unused pins as analog inputs to minimize digital switching current in power-sensitive designs.
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： ATSAMD21E15B-AUT ——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-AUT （相同外形与封装尺寸） ——差异在于 ADC, Package, RoHS Status, Communication Interfaces, GPIO Count.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21E15B-AU
✅ 直接替换✓ 有现货
$1.45 / 个
查看数据手册 →ATSAMD21E16B-AUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21E17B-AUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21E15B-AFT
✅ 直接替换✓ 有现货
$1.96 / 个
查看数据手册 →ATSAMD21E15B-AUT 最大额定值与电气特性
| Core | ARM Cortex-M0+ (32-bit) |
| CPU Clock Speed | 48 MHz |
| Flash Memory | 32 KB |
| SRAM | 4 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| I/O Voltage | 3.3 V typical |
| 封装 | 32-pin TQFP (7x7 mm) |
| Carrier Type | Tape & Reel (AUT suffix) |
| 工作温度范围 | -40C to +85C (industrial) |
| GPIO Count | 26 (estimated for 32-TQFP, full SAM D21E pinout) |
| ADC | 10-bit, 12 channels |
| DAC | 10-bit, 1 channel |
| Communication Interfaces | 6x SERCOM (UART/SPI/I2C), USB 2.0 Full-Speed Device/Host |
| DMA Channels | 5 |
| Active Power Consumption | 70 uA/MHz |
| RoHS 状态 | Compliant (Green, Pb-free) |
| MSL 等级 | MSL3 (per TQFP tape and reel convention) |
ATSAMD21E15B-AUT 引脚配置
| 引脚 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| 引脚 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| 引脚 3 | PA02 — GPIO / ADC AIN0 |
| 引脚 4 | PA03 — GPIO / ADC AIN1 / DAC VOUT |
| 引脚 5 | VDDCORE — Internal voltage regulator output - decouple with 1uF + 100nF |
| 引脚 6 | GND — Ground |
| 引脚 7 | PA04 — GPIO / ADC AIN4 / VREF |
| 引脚 8 | PA05 — GPIO / ADC AIN5 |
| 引脚 9 | PA06 — GPIO / ADC AIN6 |
| 引脚 10 | PA07 — GPIO / ADC AIN7 |
| 引脚 11 | PA08 — GPIO / I2S SCK / SERCOM0 |
| 引脚 12 | PA09 — GPIO / I2S FS / SERCOM0 |
| 引脚 13 | PA10 — GPIO / I2S MCK / SERCOM0 |
| 引脚 14 | PA11 — GPIO / SDDAT3 / SERCOM0 |
| 引脚 15 | PA12 — GPIO / SDDAT2 - 5V tolerant |
| 引脚 16 | PA13 — GPIO / SDDAT1 - 5V tolerant |
| 引脚 17 | PA14 — GPIO / SDDAT0 / SERCOM2 |
| 引脚 18 | PA15 — GPIO / SDCMD / SERCOM2 |
| 引脚 19 | PA16 — GPIO / SDWP / SERCOM1 |
| 引脚 20 | PA17 — GPIO / SDCD / SERCOM1 |
| 引脚 21 | PA18 — GPIO / SERCOM1 |
| 引脚 22 | PA19 — GPIO / SERCOM1 |
| 引脚 23 | PA20 — GPIO / SERCOM3 |
| 引脚 24 | PA21 — GPIO / SERCOM3 |
| 引脚 25 | PA22 — GPIO / SERCOM3 / I2C SDA |
| 引脚 26 | PA23 — GPIO / SERCOM3 / I2C SCL |
| 引脚 27 | PA24 — USB D- / SERCOM5 |
| 引脚 28 | PA25 — USB D+ / SERCOM5 |
| 引脚 29 | GND — Ground |
| 引脚 30 | VDD — Main supply input 1.62V-3.63V |
| 引脚 31 | PA27 — GPIO / SERCOM5 |
| 引脚 32 | RESET — Reset input, active low |
典型应用
ATSAMD21E15B-AUT 适用于 7 应用s: USB Human Interface Devices (HID), Industrial Sensor Nodes, Smart Home Hubs and Bridges, Battery-Powered Wearable Devices, Automotive Body Electronics, Consumer Remote Controls, Low-Power Wireless Sensor Networks.
USB Human Interface Devices (HID)
The ATSAMD21E15B-AUT is well suited to USB HID designs such as keyboards, mice, and custom input peripherals thanks to its integrated Full-Speed USB 2.0 device controller with on-chip transceiver and 1.5 kohm pull-up on D+. Its 48 MHz Cortex-M0+ core handles USB polling and HID report generation at < 50% CPU load, leaving the rest for matrix scanning and debouncing. Place a 10 nF + ESD protection diode array on D+/D- lines; route these as 90-ohm differential pair with length-matching within 150 mils for compliance.
推荐
Industrial Sensor Nodes
The ATSAMD21E15B-AUT suits industrial sensor nodes with 4-20 mA loop interfaces, RTD inputs, or battery-powered wireless telemetry, leveraging its 12-channel 10-bit ADC, 6 SERCOM blocks, and 70 uA/MHz active power consumption. SleepWalking peripheral events allow the ADC to run autonomously while the CPU sleeps, waking it only when a programmed threshold is crossed. Designers can integrate 4G/NB-IoT modems, RS-485 transceivers, or LoRa modules over UART/SPI without external interface logic.
推荐
Smart Home Hubs and Bridges
Smart-home gateway designs benefit from the ATSAMD21E15B-AUT's USB device port for configuration, multiple SERCOM channels for Zigbee/Matter/Thread bridge radios, and Cortex-M0+ energy efficiency for always-on wall-powered products. The 6 SERCOM blocks can each host an independent UART, SPI, or I2C link to a radio module or sensor cluster without external muxing. Add Wi-Fi or Ethernet connectivity via SPI-hosted modules for full gateway functionality.
推荐
Battery-Powered Wearable Devices
For fitness bands, BLE beacons, and wearable sensors, the ATSAMD21E15B-AUT's sub-5 uA Sleep mode with full RAM retention enables multi-month battery life on small lithium cells. Its integrated 10-bit DAC drives PWM-style haptic feedback waveforms, while the 12-channel ADC captures photodiode, temperature, and motion sensor inputs. Designers should use the Event System to handle sensor triggers without CPU wake-ups, and configure unused GPIOs as analog inputs to minimize switching current.
推荐
Automotive Body Electronics
Although not AEC-Q100 qualified, the ATSAMD21E15B-AUT's industrial -40C to +85C temperature range and Cortex-M0+ deterministic interrupt response make it suitable for non-safety automotive body applications such as HVAC controls, seat modules, or interior lighting. Designers should pair it with external CAN-FD transceivers via SPI to add automotive bus connectivity. For safety-critical applications, consider Microchip's ATSAMC21 automotive-grade family instead.
推荐
Consumer Remote Controls
Universal remote controls and AV-system remotes benefit from the ATSAMD21E15B-AUT's Cortex-M0+ core for IR protocol encoding (RC5, NEC, SIRC, etc.), low-power Sleep modes for multi-year coin-cell battery life, and 6 SERCOM channels for capacitive touch and gesture input. The integrated 10-bit DAC simplifies analog audio feedback tones. Configure the IR LED driver on a TCC PWM output for carrier generation, and use SleepWalking to wake the CPU only when a touch event is detected.
推荐
Low-Power Wireless Sensor Networks
For sub-GHz LoRa, Sigfox, or proprietary 433/868 MHz wireless sensor nodes, the ATSAMD21E15B-AUT's low active current (70 uA/MHz) and event-driven peripherals maximize battery lifetime. The 6 SERCOM blocks handle SPI to the radio modem, I2C to environmental sensors, and UART to debug consoles without bus contention. Add TCXO crystal on a TCC timer input if packet timing accuracy is needed.
推荐
推荐产品汇总
工程参考数据： ATSAMD21E15B-AUT ——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-AU | ATSAMD21E16B-AUT | ATSAMD21E17B-AUT | ATSAMD21E15B-AFT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-32 (7x7 mm) | TQFP-32 (7x7 mm) - same | TQFP-32 (7x7 mm) - same | TQFP-32 (7x7 mm) - same | TQFP-32 (7x7 mm) - same |
| Carrier Type | Tape & Reel | Tray | Tape & Reel | Tape & Reel | Tape & Reel |
| Flash Memory | 32 KB | 32 KB | 64 KB | 128 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 8 KB | 16 KB | 4 KB |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +105C (extended) |
| USB 2.0 Full-Speed | Yes | Yes | Yes | Yes | Yes |
| Approx. Unit Price (qty 1000) | $1.62 | $1.55 (estimated) | $1.95 (estimated) | $2.40 (estimated) | $1.85 (estimated) |
关键差异点
- Integrated USB 2.0 Full-Speed with on-chip transceiver （对比 ATSAMD21E15B-AU)
- Higher memory option in same footprint （对比 ATSAMD21E16B-AUT)
- Industrial -40C to +85C temperature grade （对比 ATSAMD21E15B-AFT)
- 6 SERCOM blocks = 18 logical comm channels （对比 Other Cortex-M0+ MCUs in TQFP-32)
设计说明
The SAM D21E integrates an on-chip voltage regulator that outputs VDDCORE (pin 5) at ~1.2 V from the main VDD supply. Per the datasheet, place a 1 uF X7R ceramic plus 100 nF decoupling capacitor within 3 mm of pin 5, with a wide trace to pin 6 GND. For low-noise analog designs, add a ferrite bead on the VDD line before the decoupling network to suppress switching noise from the USB transceiver.
At 48 MHz active CPU clock drawing 70 uA/MHz at 3.3 V, the ATSAMD21E15B-AUT dissipates roughly 11 mW in Active mode and under 1 mW in Sleep. The 32-TQFP package has theta_JA around 60-70 C/W on a standard JEDEC 4-layer test board. At industrial -40C to +85C operation, no heatsink is needed. However, in USB Host mode with all peripherals active, total power can rise to 50 mW - still well within package thermal limits.
Route the USB DP/DM pair (PA24/PA25, pins 27/28) as a 90-ohm differential pair with maximum length 50 mm and intra-pair skew under 150 mils. Place the USB ESD protection array within 5 mm of the connector. Keep the on-chip VBUS sense line decoupled with a 10 kohm pull-down if not used. Reserve the D+ pull-up 1.5 kohm to 3.3 V within 2 mm of pin 28 for USB device mode.
Do not exceed the 3.63 V absolute maximum VDD - even brief transients from a mis-sized LDO can latch-up the part. Configure unused GPIOs as analog inputs (not digital inputs) to minimize digital switching current in battery-powered designs. The internal voltage regulator requires the 1 uF decoupling on VDDCORE - omitting it causes core supply noise that manifests as ADC measurement errors and erratic USB enumeration.
Estimated: For SERCOM signals operating above 1 MHz, add 22-33 ohm series termination to dampen reflections on long traces. The SAM D21E IO drive strength defaults to 2 mA which is insufficient for long SPI or QSPI traces - configure the PORT register DRVSTR bit to high (4 mA) for SPI clock speeds above 8 MHz. For I2C bus speeds above 400 kHz, use external 2.2 kohm pull-ups even if internal weak pull-ups are configured.
合规信息
RoHS and REACH compliant per Microchip product page. Lead-free (Pb-free) Green packaging. Not AEC-Q100 qualified - for automotive safety applications use the ATSAMC21 family.
