ATSAML21E15B-MUT - 32KB Flash Cortex-M0+ MCU | Microchip
부품 번호: ATSAML21E15B-MUT ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.2 | $32.00 |
| 100 | $2.75 | $275.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.2 | $2,200.00 |
ATSAML21E15B-MUT 개요
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O. The ARM Cortex-M0+ is the smallest and most energy-efficient member of the ARM Cortex-M processor family, designed for embedded applications where low power, deterministic interrupt response, and small code footprint are critical. The SAM L21 family specifically targets battery-powered IoT endpoints, wearables, and Energy Harvesting designs where every microamp counts. Within the broader hierarchy, the ATSAML21E15B-MUT sits at: ARM Cortex-M0+ -> 32-bit MCU -> microcontroller -> embedded processor -> semiconductor IC.
Key features include a 12-bit 1 Msps ADC, a 12-bit DAC, SERCOM (serial communication) peripherals configurable as UART/SPI/I2C, a 32 KB Flash program memory, 4 KB SRAM, an on-chip 32 kHz RTC oscillator, and a full-speed USB 2.0 device interface. It also supports SleepWalking peripherals and an Event System that allows peripherals to communicate without CPU intervention - a hallmark feature for low-power designs.
The SAM L21 architecture combines an efficient Cortex-M0+ core with the Microchip Sleep Technology (Most) power-saving IP. It provides six different power domains and up to six low-power modes, with a dedicated RTC running from a 32 kHz crystal that keeps the device aware of the outside world while consuming only hundreds of nanoamps. The Event System and SERCOM configurability let the same silicon serve multiple roles in a BOM.
Typical applications include battery-powered IoT sensor nodes, wearables and fitness trackers, energy-harvesting devices, smart-home wireless sensors (LoRa/Zigbee/Thread/BLE companion MCUs), industrial data loggers, and USB-powered human-interface devices such as custom keyboards or HID peripherals.
When designing with this device, choose the right low-power mode for the duty cycle: Sleep mode for fast wake-up, Standby for RTC-only operation, and Backup for nanoamp quiescent current. Always place the decoupling network within 2 mm of the VDD pin, and connect the exposed pad to a continuous ground pour for thermal and electrical performance.
This page synthesizes distributor pricing, drop-in same-package alternatives from the SAM L21 family, and practical low-power design notes that go beyond the manufacturer datasheet to help you select and use the part correctly.
드롭인 대체품: ATSAML21E15B-MUT — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ATSAML21E15B-MUT (동일 폼 팩터 및 풋프린트) — 차이점: Package, SRAM, Mounting Type, ADC, Core Architecture.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ATSAML21E15B-MF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ATSAML21E16B-MUT
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$2.3 / 개
데이터시트 보기 →ATSAML21E17B-MUT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ATSAML21E18B-MUT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ATSAML21G16B-MUT
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$2.16 / 개
데이터시트 보기 →ATSAML21E15B-MUT 최대 정격 & 전기적 특성
| Core Architecture | ARM Cortex-M0+ |
| Bit Width | 32-bit |
| 최대 클록 주파수 | 48 MHz |
| Program Memory (Flash) | 32 KB |
| SRAM | 4 KB |
| Supply Voltage Range | 1.62 V to 3.63 V |
| Active Mode Current | < 35 uA/MHz |
| Sleep Mode Current | 200 nA |
| ADC | 12-bit, up to 1 Msps |
| DAC | 12-bit |
| USB Interface | USB 2.0 Full-Speed Device |
| Communication Peripherals | SERCOM (UART/SPI/I2C configurable) |
| 패키지 | 32-VQFN (5x5 mm) with exposed pad |
| 동작 온도 | -40 C to +85 C (industrial) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
ATSAML21E15B-MUT 핀 구성
| 핀 1 | PA00 — GPIO / XIN (external clock input) |
| 핀 2 | PA01 — GPIO / XOUT (external clock output) |
| 핀 3 | PA02 — GPIO / AIN0 (ADC input) |
| 핀 4 | PA03 — GPIO / AIN1 / VREFA reference |
| 핀 5 | GND — Ground |
| 핀 6 | VDD — Core supply voltage (1.62-3.63V) |
| 핀 7 | PA04 — GPIO / AIN2 / VREFB reference |
| 핀 8 | PA05 — GPIO / AIN3 |
| 핀 9 | PA06 — GPIO / AIN4 |
| 핀 10 | PA07 — GPIO / AIN5 |
| 핀 11 | PA08 — GPIO / AIN6 / SERCOM pad |
| 핀 12 | PA09 — GPIO / AIN7 / SERCOM pad |
| 핀 13 | PA10 — GPIO / AIN8 / SERCOM pad |
| 핀 14 | PA11 — GPIO / AIN9 / SERCOM pad |
| 핀 15 | VDDIO — I/O supply voltage |
| 핀 16 | GND — Ground |
| 핀 17 | PA14 — GPIO / SERCOM pad |
| 핀 18 | PA15 — GPIO / SERCOM pad |
| 핀 19 | PA16 — GPIO / SERCOM pad |
| 핀 20 | PA17 — GPIO / SERCOM pad |
| 핀 21 | PA18 — GPIO / SERCOM pad |
| 핀 22 | PA19 — GPIO / SERCOM pad |
| 핀 23 | PA20 — GPIO / SERCOM pad |
| 핀 24 | PA21 — GPIO / SERCOM pad |
| 핀 25 | PA22 — GPIO / SERCOM pad |
| 핀 26 | PA23 — GPIO / USB SOF 1 kHz output |
| 핀 27 | PA24 — GPIO / USB DM (USB D-) |
| 핀 28 | PA25 — GPIO / USB DP (USB D+) |
| 핀 29 | RESET — Reset input (active low) |
| 핀 30 | SWDIO — Serial Wire Debug I/O |
| 핀 31 | SWCLK — Serial Wire Debug Clock |
| 핀 32 | VDD — Core supply voltage |
일반적인 애플리케이션
ATSAML21E15B-MUT 적합 용도: 7 애플리케이션s: Battery-Powered IoT Sensor Nodes, Wearables and Fitness Trackers, Energy-Harvesting Wireless Switches, USB Human-Interface Devices (HID), Industrial Data Loggers, Smart-Home Wireless Sensor Hubs, Medical Monitoring Devices.
Battery-Powered IoT Sensor Nodes
The ATSAML21E15B-MUT's 200 nA Sleep current with RTC retention and <35 uA/MHz active consumption make it ideal for wireless sensor nodes that must run years on a single coin cell or 2x AA battery. The Event System lets SERCOM, ADC, and GPIO peripherals communicate without waking the CPU, while SleepWalking autonomously wakes the ADC only when a threshold is crossed. At 1.62-3.63V supply, the MCU runs directly from a single-cell Li-ion/Li-poly (3.0-4.2V with LDO) or two alkaline AAs (3.0V), eliminating boost regulators. The 12-bit 1 Msps ADC with 16 channels handles temperature, humidity, pressure, and analog sensor interfaces; SERCOM peripherals implement UART/SPI/I2C for BME280, SHT31, or LoRa transceivers like SX1276. Compared to a switching regulator + MCU architecture, the SAM L21 saves 5-15 µA quiescent current, extending battery life by 20-40% in 1% duty-cycle sensor beacons.
추천
Wearables and Fitness Trackers
Wearables demand 7-30 day battery life with always-on motion/heart-rate sensing. The ATSAML21E15B-MUT's ultra-low-power Sleep modes, on-chip 12-bit ADC for ECG/PPG analog front-ends, and SERCOM-based I2C interface to optical heart-rate sensors make it a strong host MCU. The 48 MHz Cortex-M0+ core runs BLE stacks (when paired with a co-processor) or proprietary 2.4 GHz protocols while keeping compute headroom under 35 µA/MHz. The 32-VQFN (5x5 mm) footprint fits inside wristband form factors, and the 200 nA Sleep current with RTC retention means 24/7 step counting costs negligible battery budget. Compared to nRF52832-based wearables, the SAM L21 lowers Sleep current by 5-10x for the host portion, at the cost of integrating a separate radio SoC.
추천
Energy-Harvesting Wireless Switches
Self-powered IoT devices (EnOcean-style light switches, HVAC controllers, asset trackers) harvest energy from button presses, vibration, or indoor light and must transmit RF packets with no battery. The ATSAML21E15B-MUT's 1.62V minimum supply lets it boot directly from energy-harvester output without an intermediate boost regulator, and its 200 nA Sleep current means standby losses are negligible. The fast Cortex-M0+ wake-up time (sub-10 µs from Sleep) lets the MCU transmit a complete RF packet within a single button-press energy budget. With the Event System, a GPIO interrupt can directly trigger SERCOM SPI to a companion radio without CPU wake, maximizing the energy budget for the radio. This topology achieves 100,000+ press cycles from a single coin cell or supercapacitor.
추천
USB Human-Interface Devices (HID)
USB keyboards, mice, custom HID peripherals, and USB dongles benefit from the ATSAML21E15B-MUT's integrated USB 2.0 Full-Speed device controller with on-chip transceiver. The 32 KB Flash fits a USB HID stack plus application logic for custom interfaces (game controllers, foot pedals, presentation clickers), while the SERCOM peripherals handle additional UART/SPI channels for firmware updates or debug. The 48 MHz Cortex-M0+ comfortably drives 8 kHz USB polling with cycles to spare for debouncing, LED control, and capacitive-touch scanning. Compared to discrete USB controllers + 8-bit MCUs, the SAM L21 saves 50-70% of PCB area and BOM cost while adding low-power Sleep for battery-powered wireless HID peripherals.
추천
Industrial Data Loggers
Industrial sensors monitoring temperature, pressure, flow, or vibration in remote locations need years of unattended operation. The ATSAML21E15B-MUT's industrial temperature range (-40°C to +85°C), 12-bit ADC with internal temperature sensor reference, RTC with calendar functions, and 200 nA Sleep with RTC retention enable multi-year battery-powered loggers. The on-chip 32 KB Flash stores weeks of timestamped data at typical 1-minute sample intervals; the 12-bit DAC drives 4-20 mA loops for legacy industrial interfaces. SERCOM peripherals communicate with external sensors over SPI/I2C/UART. Compared to discrete RTC + ADC + MCU designs, the SAM L21 integrates all of these on a single die with consistent low-power behavior, reducing BOM count by 30-40%.
추천
Smart-Home Wireless Sensor Hubs
Smart-home devices bridging Zigbee, Thread, Matter, LoRa, or BLE sensors to Wi-Fi/cloud gateways need a low-power host MCU that wakes on sensor events, reads data, and forwards it to a high-power radio co-processor. The ATSAML21E15B-MUT's SleepWalking peripherals monitor GPIO and ADC without CPU, wake the core only on threshold crossings, and hand off sensor data via SERCOM SPI to a host radio (nRF52840, ESP32, or similar). The 1.62-3.63V supply lets it run from 2x AA or USB power without additional regulators. Compared to always-on hub architectures, this sleep-and-forward topology reduces idle power by 80-90%, enabling battery-powered window/door sensors that last 5+ years on a single CR2032.
추천
Medical Monitoring Devices
Portable medical devices such as pulse oximeters, glucose meters, single-lead ECG patches, and spirometers benefit from the ATSAML21E15B-MUT's ultra-low-power Sleep modes, integrated 12-bit ADC for analog biosensor front-ends, and 12-bit DAC for sensor excitation/stimulation. The 32 KB Flash holds firmware for sensor calibration, display drivers (via SPI to OLED), and USB data upload. The 200 nA Sleep current with RTC retention lets devices sit idle for months while still waking on a button press or scheduled measurement. Compared to discrete analog front-end + 8-bit MCU designs, the SAM L21 provides a unified Cortex-M0+ platform with deterministic interrupt response for medical-grade timing requirements.
추천
추천 제품 요약
엔지니어링 참조 데이터: ATSAML21E15B-MUT — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ATSAML21E15B-MF | ATSAML21E16B-MUT | ATSAML21E17B-MUT | ATSAML21E18B-MUT | ATSAML21G16B-MUT |
|---|---|---|---|---|---|---|
| Package | 32-VQFN (5x5) | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Flash | 32 KB | 32 KB | 64 KB | 128 KB | 256 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 8 KB | 16 KB | 32 KB | 8 KB |
| Max Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Sleep Current | 200 nA | 200 nA | 200 nA | 200 nA | 200 nA | 200 nA |
| Supply Voltage | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V | 1.62-3.63 V |
주요 차별점
- Lowest Sleep current in Cortex-M0+ class (vs ATSAMD21E15B-MUT)
- Event System + SleepWalking peripherals (vs ATSAMD21E15B-MUT)
- Direct battery operation from 1.62V (vs ATSAMD21E15B-MUT)
설계 노트
Estimated battery-life calculation: at 1% duty cycle (1 second active per 99 seconds Sleep), the ATSAML21E15B-MUT averages roughly (35 uA/MHz x 48 MHz x 0.01) + (200 nA x 0.99) ~ 17 µA average current. From a 240 mAh CR2032 coin cell, this yields ~14,000 hours (~1.6 years) of operation. For ultra-low-duty designs (<0.01%), Sleep current dominates and the choice of peripheral wake sources (Event System, RTC, GPIO) matters more than CPU clock speed. Always enable the on-chip DC-DC converter rather than the LDO for active mode to minimize quiescent current.
Place 100 nF decoupling capacitors within 2 mm of every VDD and VDDIO pin, plus a bulk 4.7 µF on the main VDD rail. Connect the exposed thermal pad (EP) directly to a continuous ground pour with at least 8 thermal vias to the inner ground plane - this provides both electrical ground reference and thermal dissipation for sustained active-mode operation. Route USB DP/DM (PA24/PA25) as a 90-ohm differential pair with matched length, and keep them away from switching signals. SWDIO/SWCLK should be routed to a 4-pin or 10-pin debug header for production programming.
Do not exceed 3.63V on any VDD/VDDIO pin - the SAM L21 is a 1.8V/3.3V-class MCU and will latch up at higher voltages. Do not leave unused GPIO floating; configure them as output-low or input with internal pull-up enabled to prevent shoot-through current. When using the USB peripheral, ensure VDDIO matches the selected USB reference voltage (typically 3.3V); the SAM L21's USB transceiver requires the core voltage rail to be at least 3.0V for proper operation. Finally, when entering Backup or Off mode, the device must be woken via a specific reset sequence - verify wake-up timing in the datasheet's electrical characteristics section.
The 32-VQFN (5x5 mm) package requires careful PCB layout: the central exposed pad must be soldered to a square land pattern (typically 3.0x3.0 mm) with multiple thermal vias to ground for reliable reflow. Pin 1 is identified by a dot on the package top; orient the PCB silkscreen accordingly. Avoid routing traces under the package unless on an inner ground plane - keep the top layer clear under the EP for thermal dissipation. For high-EMI environments, add a ferrite bead on VDD and place the ADC reference decoupling (1 nF + 100 nF) close to the VREF pin if used in ADC reference mode.
규정 준수 정보
RoHS compliant per Microchip product page. Industrial temperature grade (-40C to +85C). Not AEC-Q100 qualified - choose SAM V71/V7x for automotive.
