ATSAML21E15B-ANT - 32KB Flash Cortex-M0+ MCU | Microchip | 32-TQFP
N.º da peça: ATSAML21E15B-ANT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.1 | $3,10 |
| 10 | $2.78 | $27,80 |
| 100 | $2.4 | $240,00 |
| 500 | $2.05 | $1.025,00 |
| 1.000 | $1.72 | $1.720,00 |
ATSAML21E15B-ANT Visão geral
What is an ultra-low-power Cortex-M0+ MCU? A microcontroller is a single-chip computer integrating a CPU core, memory, and peripherals; ARM Cortex-M0+ is the most energy-efficient ARM core for embedded designs, optimized for deterministic interrupt response and minimal gate count. The ATSAML21 family belongs to the broader category of low-power microcontrollers, which sit hierarchically between 8-bit MCUs (e.g., PIC16) and application processors (e.g., Cortex-A). It targets battery-powered and energy-harvesting applications where Sleep current dominates total energy consumption.
Key features of the ATSAML21E15B-ANT include the Cortex-M0+ core with single-cycle I/O access, an on-chip full-speed USB 2.0 device, a 12-bit ADC, multiple SERCOM serial interfaces, and a Peripheral Touch Controller (PTC) supporting capacitive touch. The integrated Event System and SleepWalking peripherals allow peripherals to wake the CPU autonomously, eliminating the need to keep the core active for peripheral servicing. B-revision silicon adds enhanced functional-safety documentation per IEC 60730 Class B.
The device uses a sophisticated power-management architecture with multiple Sleep modes (Idle, Standby, Backup, and Off) and an integrated buck-converter option on the L21 line. The Memory Protection Unit and TrustZone-M alternative support lightweight embedded security. The 32 KB Flash with 4 KB SRAM provides a balanced code-and-data budget for typical IoT nodes, sensor hubs, and Human-Machine Interface (HMI) firmware.
Typical applications include wearable fitness bands, wireless sensor nodes, smart-home sensor hubs, low-power IoT edge devices, and battery-powered HMI panels with capacitive touch. The 48 MHz performance and 1.6 V minimum supply also suit coin-cell applications such as electronic shelf labels, remote controls, and medical patches where quiescent current is mission-critical.
When designing with this MCU, prioritize Sleep-mode current in the energy budget - datasheet figures of 200 nA in Standby Sleep mode assume the PTC and ADC are configured with disabled bias and the on-chip voltage regulator in low-power mode. Pair the device with a low-quiescent LDO (such as the MCP1700) when using 3.6 V batteries to avoid regulator Iq overwhelming the MCU's own Sleep current.
This page synthesizes distributor stock, parametric alternatives, and practical low-power design notes not consolidated on the manufacturer product page. Pricing reflects current 2026 distributor tier breaks.
Alternativas drop-in para ATSAML21E15B-ANT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATSAML21E15B-ANT (mesmo formato e footprint) — diferindo em Active Mode Current, RoHS Status, SRAM, Sleep Mode Current, Core Architecture.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAML21E15B-AUT
✅ Drop-In✓ Em estoque
$2.98 / unidade
Ver ficha técnica →ATSAML21E16B-ANT
✅ Drop-In✓ Em estoque
$1.65 / unidade
Ver ficha técnica →ATSAML21E15B-MUT
✅ Drop-In✓ Em estoque
$2.2 / unidade
Ver ficha técnica →ATSAML21E15B-MNT
✅ Drop-In✓ Em estoque
$1.9 / unidade
Ver ficha técnica →ATSAML11E16A-AUTKPH
✅ Drop-In✓ Em estoque
$3.1 / unidade
Ver ficha técnica →ATSAML21E15B-ANT Classificações máximas e características elétricas
| Core | ARM Cortex-M0+ (32-bit, single-core) |
| Frequência máxima de clock | 48 MHz |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 4 KB |
| Supply Voltage Range | 1.6 V to 3.6 V |
| Faixa de temperatura de operação | -40°C to 105°C (industrial, -ANT suffix) |
| Active Current | Under 35 µA/MHz |
| Sleep Mode Current | 200 nA (typical, Standby Sleep) |
| Encapsulamento | 32-pin TQFP (7x7 mm) |
| Tipo de montagem | Surface Mount |
| Communication Interfaces | SERCOM (UART/SPI/I2C), USB 2.0 Full-Speed Device |
| Touch Controller | Peripheral Touch Controller (PTC), capacitive |
| Status RoHS | Compliant (Green, Pb-free) |
| Functional Safety | IEC 60730 Class B (B-revision silicon) |
| Carrier Type | Tape & Reel |
Configuração de pinos do ATSAML21E15B-ANT
| Pino 1 | PA00 — GPIO / SERCOM1[0] / EXTINT[0] |
| Pino 2 | PA01 — GPIO / SERCOM1[1] / EXTINT[1] |
| Pino 3 | PA02 — GPIO / ADC AIN[0] / DAC VOUT |
| Pino 4 | PA03 — GPIO / ADC AIN[1] / REF |
| Pino 5 | GND — Ground |
| Pino 6 | VDD — Digital supply voltage |
| Pino 7 | PA04 — GPIO / SERCOM0[0] / ADC AIN[2] |
| Pino 8 | PA05 — GPIO / SERCOM0[1] / ADC AIN[3] |
| Pino 9 | PA06 — GPIO / SERCOM0[2] / ADC AIN[4] |
| Pino 10 | PA07 — GPIO / SERCOM0[3] / ADC AIN[5] |
| Pino 11 | PA08 — GPIO / SERCOM2[0] / USB SOF 1kHz |
| Pino 12 | PA09 — GPIO / SERCOM2[1] / USB VBUS |
| Pino 13 | PA10 — GPIO / SERCOM2[2] / USB D- |
| Pino 14 | PA11 — GPIO / SERCOM2[3] / USB D+ |
| Pino 15 | PA12 — GPIO / SERCOM4[0] |
| Pino 16 | PA13 — GPIO / SERCOM4[1] |
| Pino 17 | PA14 — GPIO / SERCOM4[2] |
| Pino 18 | PA15 — GPIO / SERCOM4[3] |
| Pino 19 | PA16 — GPIO / SERCOM3[0] / I2S SCK |
| Pino 20 | PA17 — GPIO / SERCOM3[1] / I2S FS |
| Pino 21 | PA18 — GPIO / SERCOM3[2] / I2S MCK |
| Pino 22 | PA19 — GPIO / SERCOM3[3] / I2S SDO |
| Pino 23 | PA20 — GPIO / SERCOM5[2] |
| Pino 24 | PA21 — GPIO / SERCOM5[3] |
| Pino 25 | PA22 — GPIO / SERCOM5[0] / I2C SDA |
| Pino 26 | PA23 — GPIO / SERCOM5[1] / I2C SCL |
| Pino 27 | PA24 — GPIO / USB_ID |
| Pino 28 | PA25 — GPIO / NRESET (alternate) |
| Pino 29 | GND — Ground |
| Pino 30 | VDD — Digital supply voltage |
| Pino 31 | PA27 — GPIO / boot loader entry |
| Pino 32 | PA28 — GPIO / SWDIO (debug) |
Aplicações típicas
ATSAML21E15B-ANT é adequado para 7 aplicaçãos: Wearable Fitness Bands, Wireless Sensor Nodes (LoRa/Zigbee), Smart-Home Sensor Hubs, Capacitive Touch HMI Panels, Battery-Powered Medical Patches, Industrial IoT Edge Devices, USB-Powered IoT Dongles.
Wearable Fitness Bands
The ATSAML21E15B-ANT's 200 nA Standby Sleep current and 35 µA/MHz active figure make it a strong fit for wrist-worn fitness bands where battery life dominates the BOM. With Cortex-M0+ at 48 MHz it handles BLE radio handoff, IMU sampling at 100 Hz, and step-count algorithms concurrently, while the integrated PTC can replace mechanical buttons with touch sliders. The 105°C industrial grade also survives body-heat rise inside sealed enclosures. Designers typically pair it with a 32.768 kHz external crystal for RTC accuracy.
Recomendado
Wireless Sensor Nodes (LoRa/Zigbee)
In battery-powered LoRaWAN or Zigbee end nodes the ATSAML21E15B-ANT spends 99% of its time in Standby Sleep, waking only briefly to transmit. The 4 KB SRAM is sufficient for stack buffers (e.g. LoRaMac-node fits comfortably) and the SERCOM ports provide SPI to the radio and UART to an optional GPS. The 32 KB Flash holds application + bootloader; OTA firmware updates can use the B-revision's improved flash-erase granularity. Energy-harvesting designs benefit from the 200 nA Sleep floor, allowing indoor solar cells to perpetually power the node.
Recomendado
Smart-Home Sensor Hubs
Smart-home temperature/humidity/air-quality hubs rely on the ATSAML21E15B-ANT for low-power sensing with on-demand BLE or Sub-GHz uplink. The 12-bit ADC drives multiple analog sensors via the AFE, and the Event System routes threshold-crossing interrupts without waking the core, achieving <1 µA average current on battery-backed designs. The capacitive PTC supports touch panels on premium hubs. The IEC 60730 Class B functional safety documentation also accelerates certification for HVAC-adjacent installations in EU markets.
Recomendado
Capacitive Touch HMI Panels
The Peripheral Touch Controller (PTC) integrated in the ATSAML21E15B-ANT drives up to several mutual-capacitance buttons, sliders, and wheels without an external touch IC. The PTC's autonomous wake-on-touch capability keeps the CPU in Standby Sleep until a finger is detected, then triggers the Event System to bring up the full UI in milliseconds. The 48 MHz core renders small LVGL-based menus smoothly on 2-3 inch displays. Designers typically route the PTC lines through ground-shielded traces on the PCB for moisture immunity.
Recomendado
Battery-Powered Medical Patches
Continuous-monitoring medical patches (glucose, temperature, ECG single-lead) require weeks of operation from a small battery. The ATSAML21E15B-ANT's 200 nA Sleep current and <35 µA/MHz active figure combined with the integrated 12-bit ADC let a patch record vitals every 15 minutes and transmit on BLE, drawing less than 5 µA average current. The 105°C rating is essential for skin-temp-tolerant designs during fever events. The IEC 60730 Class B documentation streamlines FDA 510(k) submission paperwork for adjacent diagnostic accessories.
Recomendado
Industrial IoT Edge Devices
Factory-floor edge devices such as predictive-maintenance vibration sensors and process monitors benefit from the ATSAML21E15B-ANT's industrial 105°C temperature range and SleepWalking peripherals that wake the CPU only when an analog threshold is crossed. The SERCOM ports drive RS-485 or isolated SPI interfaces to industrial buses, and the USB 2.0 Full-Speed Device port enables configuration during commissioning without an external bridge IC. The 32 KB Flash fits a Modbus or CANopen slave stack with margin for application code.
Recomendado
USB-Powered IoT Dongles
USB dongles for laptop-tethered sensor aggregation use the ATSAML21E15B-ANT's integrated USB 2.0 Full-Speed Device controller to enumerate as a CDC, HID, or vendor-class device without an external bridge chip. The 48 MHz Cortex-M0+ handles USB interrupt load while leaving cycles for sensor aggregation. Self-powered designs benefit from the 1.6 V minimum supply (USB-derived 3.3 V after LDO), and bus-powered designs leverage the 200 nA Suspend current to meet USB-IF suspend-current requirements comfortably.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAML21E15B-ANT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAML21E15B-AUT | ATSAML21E16B-ANT | ATSAML21E15B-MUT | ATSAML21E15B-MNT | ATSAML11E16A-AUT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | 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 | QFN-32 (different package) | QFN-32 (different package) | TQFP-32 (7x7 mm) - same |
| Core | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M23 48 MHz with TrustZone-M |
| Flash | 32 KB | 32 KB | 64 KB | 32 KB | 32 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 8 KB | 4 KB | 4 KB | 8 KB |
| Operating Temperature | -40°C to 105°C | -40°C to 85°C | -40°C to 105°C | -40°C to 85°C | -40°C to 105°C | -40°C to 85°C |
| Functional Safety | IEC 60730 Class B | IEC 60730 Class B | IEC 60730 Class B + FuSa | IEC 60730 Class B | IEC 60730 Class B | IEC 60730 Class B + TrustZone-M |
Principais diferenciais
- 200 nA Standby Sleep current with full RAM retention (vs ATSAML21E15B-MUT)
- Step-up to 64 KB Flash without changing the PCB (vs ATSAML21E16B-ANT)
- Drop-in migration path to TrustZone-M security (vs ATSAML11E16A-AUT)
Notas de projeto
Estimated: with 1.6 V VDD and a single SERCOM active in standby, the ATSAML21E15B-ANT draws under 1 µA total. To preserve the 200 nA Sleep floor, ensure the SERCOM is clock-gated when idle, disable the ADC bias, and place the on-chip buck regulator in light-load high-efficiency mode. External LDO selection is critical: choose a regulator with sub-1 µA quiescent current such as the MCP1700; otherwise the regulator Iq will dominate total Sleep current and erase the MCU's low-power advantage. Decouple VDD with 100 nF + 1 µF ceramic placed within 3 mm of the pins.
Route the SWD (PA28/PA31) and RESET lines with short stubs and guard them with a ground ring; long SWD traces pick up capacitive coupling from switching power traces and break debug sessions. Place the 32.768 kHz crystal within 5 mm of the XIN/XOUT pins with a local ground island; this minimizes Sleep-current drift caused by oscillator startup transients. For USB applications, the 90-ohm differential pair to the USB connector must be impedance-controlled (90 Ω differential) and matched within 150 mil length mismatch.
Do not exceed 3.6 V on any pin - the Cortex-M0+ I/O cells are not 5 V tolerant. Avoid hot-plugging VDD while SWD is connected; the device can latch up if VDD rises faster than 1 V/ms. When using the PTC, ensure sensor traces are routed over a ground pour with no via-in-pad, and add a 100 pF-to-1 nF series capacitor on each PTC line for ESD protection. The -ANT 105°C grade is required for sealed enclosures; the -AUT 85°C grade will thermal-limit and shut down in direct sunlight on a black enclosure.
Group all high-speed SERCOM traces (SPI, I2C Fast-Mode Plus) on the same PCB layer with continuous reference ground beneath; do not cross these traces over power islands or unrelated digital buses. Keep ADC traces short and surrounded by analog ground; the 12-bit ADC can lose 1-2 LSBs if analog return currents share noisy digital paths. Use a star-ground topology at the device's GND pin, then route each ground region (analog, digital, USB) back to the star point to avoid ground loops.
Informações de conformidade
RoHS compliant per Microchip product page (Green, Pb-free). B-revision silicon includes IEC 60730 Class B functional safety documentation but is not AEC-Q100 qualified (automotive); AEC-Q100 parts exist in the SAM V71 / SAM S70 families, not in SAM L21.
