ATSAMD21E15B-AUT - 32KB Flash Cortex-M0+ MCU, 32-TQFP | Microchip
MPN: ATSAMD21E15B-AUT ✓ Hoạt độngATSAMD21E15B-AUT Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21E15B-AUT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATSAMD21E15B-AUT (cùng hình factor và footprint) — khác nhau ở ADC, Package, RoHS Status, Communication Interfaces, GPIO Count.
ATSAMD21E15B-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E16B-AUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21E17B-AUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21E15B-AFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E15B-AUT Tỷ lệ tối đa & tính chất điện
| 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 |
| Hộp | 32-pin TQFP (7x7 mm) |
| Carrier Type | Tape & Reel (AUT suffix) |
| Khoảng nhiệt độ hoạt động | -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 |
| Trạng thái RoHS | Compliant (Green, Pb-free) |
| Cấp MSL | MSL3 (per TQFP tape and reel convention) |
Cấu hình chân ATSAMD21E15B-AUT
| Chân 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| Chân 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| Chân 3 | PA02 — GPIO / ADC AIN0 |
| Chân 4 | PA03 — GPIO / ADC AIN1 / DAC VOUT |
| Chân 5 | VDDCORE — Internal voltage regulator output - decouple with 1uF + 100nF |
| Chân 6 | GND — Ground |
| Chân 7 | PA04 — GPIO / ADC AIN4 / VREF |
| Chân 8 | PA05 — GPIO / ADC AIN5 |
| Chân 9 | PA06 — GPIO / ADC AIN6 |
| Chân 10 | PA07 — GPIO / ADC AIN7 |
| Chân 11 | PA08 — GPIO / I2S SCK / SERCOM0 |
| Chân 12 | PA09 — GPIO / I2S FS / SERCOM0 |
| Chân 13 | PA10 — GPIO / I2S MCK / SERCOM0 |
| Chân 14 | PA11 — GPIO / SDDAT3 / SERCOM0 |
| Chân 15 | PA12 — GPIO / SDDAT2 - 5V tolerant |
| Chân 16 | PA13 — GPIO / SDDAT1 - 5V tolerant |
| Chân 17 | PA14 — GPIO / SDDAT0 / SERCOM2 |
| Chân 18 | PA15 — GPIO / SDCMD / SERCOM2 |
| Chân 19 | PA16 — GPIO / SDWP / SERCOM1 |
| Chân 20 | PA17 — GPIO / SDCD / SERCOM1 |
| Chân 21 | PA18 — GPIO / SERCOM1 |
| Chân 22 | PA19 — GPIO / SERCOM1 |
| Chân 23 | PA20 — GPIO / SERCOM3 |
| Chân 24 | PA21 — GPIO / SERCOM3 |
| Chân 25 | PA22 — GPIO / SERCOM3 / I2C SDA |
| Chân 26 | PA23 — GPIO / SERCOM3 / I2C SCL |
| Chân 27 | PA24 — USB D- / SERCOM5 |
| Chân 28 | PA25 — USB D+ / SERCOM5 |
| Chân 29 | GND — Ground |
| Chân 30 | VDD — Main supply input 1.62V-3.63V |
| Chân 31 | PA27 — GPIO / SERCOM5 |
| Chân 32 | RESET — Reset input, active low |
Ứng dụng tiêu biểu
ATSAMD21E15B-AUT phù hợp cho 7 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21E15B-AUT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Integrated USB 2.0 Full-Speed with on-chip transceiver (vsATSAMD21E15B-AU)
- Higher memory option in same footprint (vsATSAMD21E16B-AUT)
- Industrial -40C to +85C temperature grade (vsATSAMD21E15B-AFT)
- 6 SERCOM blocks = 18 logical comm channels (vsOther Cortex-M0+ MCUs in TQFP-32)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
