ATSAMD21G17L-MNT - SAM D21G Cortex-M0+ MCU 128KB Flash 48-QFN | Microchip
MPN: ATSAMD21G17L-MNT ✓ Hoạt độngATSAMD21G17L-MNT Tóm tắt
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory (Flash), data memory (SRAM), and a rich set of on-chip peripherals such as timers, communication interfaces and ADCs. Within the broader taxonomy, an MCU belongs to the semiconductor category, then to microcontrollers, then to ARM Cortex-M class devices, and finally to the Cortex-M0+ sub-class - the smallest, most energy-efficient ARM core designed for deterministic real-time control. The ATSAMD21G17L sits at the entry point of the SAM D20/D21 family, balancing memory, pin count, and peripheral mix for cost-sensitive applications.
The device features 128 KB of in-system programmable Flash with 4 KB read-while-write (RWW) capability, 16 KB SRAM, a 12-bit 350 ksps ADC with up to 20 channels, two analog comparators, six SERCOM modules configurable as UART/SPI/I2C, a USB 2.0 Full-Speed device (no PHY needed), up to 38 GPIO, a 24-bit PWM timer counter, and a hardware peripheral touch controller supporting capacitive buttons, sliders, and wheel sensing. The integrated PTC enables touch-driven UI without an external touch IC, lowering BOM cost in HMI applications.
Architecturally, the ATSAMD21G17L uses Microchip's event system for inter-peripheral signaling without CPU intervention, a 6-channel DMA controller to offload data movement, and an interrupt controller supporting up to 16 priority levels. The USB module integrates a 3.3 V regulator and transceiver, allowing direct bus-powered designs. Cryptographic accelerators are not present on the 'G17' part - those are reserved for the D21 'E' and 'J' variants - which keeps pricing low for lighting and metering applications that do not require on-chip crypto.
Typical applications include LED lighting controllers with capacitive touch dimmers, USB-CDC virtual COM-port bridges, smart-home sensor hubs, IoT end nodes using UART/SPI peripherals, and consumer devices requiring small form-factor MCUs. The wide 1.62 V to 3.63 V operating range lets the same part work from a single Li-ion cell, two AA cells, or a regulated 3.3 V rail. Combined with 105 C maximum junction temperature support (L-suffix), the MNT suffix (tape-and-reel, matte-Sn finish) is qualified for high-volume manufacturing.
When designing with this device, pay close attention to PCB layout of the exposed pad (EP) - it must be soldered to a continuous ground plane for thermal dissipation and electrical reference, and decoupling must use at least 100 nF + 4.7 uF per VDD pin. For USB applications, the D+/D- traces require 90-ohm differential impedance, and the 48 MHz core must be sourced from a 32.768 kHz crystal via the DFLL or from the internal 8 MHz oscillator trimmed to +/- 2%. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC and Heisener, drop-in same-brand SAM D21 alternatives, and practical design notes not aggregated elsewhere.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21G17L-MNT — 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 ATSAMD21G17L-MNT (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, ADC, USB, Mounting Type.
ATSAMD21G17L-MN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21G17L-MUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21G18L-MNT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21G16L-MUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E17L-MN
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21G17D-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21G17A-MFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21G17L-MNT Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Family | SAM D21G |
| Series | ATSAMD21 |
| Maximum CPU Frequency | 48 MHz |
| Flash Memory | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Read-While-Write Flash Partition | 4 KB |
| Supply Voltage (VDD) | 1.62 V to 3.63 V |
| I/O Voltage | 1.62 V to 3.63 V (same as VDD) |
| GPIO Count | Up to 38 |
| ADC | 12-bit, up to 20 channels, 350 ksps |
| Analog Comparators | 2 |
| SERCOM Modules | 6 (configurable as UART/SPI/I2C) |
| USB | USB 2.0 Full-Speed Device, integrated transceiver |
| Peripheral Touch Controller (PTC) | Yes (capacitive touch sensing) |
| DMA Channels | 6 |
| Timers/Counters | TC0..TC5 + TCC0..TCC1, multiple PWM outputs |
| Nhiệt độ hoạt động | -40C to +105C (L-suffix, industrial) |
| Hộp | 48-QFN (7x7 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount, Tape and Reel (MNT suffix) |
| Lead Finish | Matte tin (lead-free, GREEN) |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATSAMD21G17L-MNT
| Chân 1 | PA00 — PORTA GPIO / XIN32 reference clock input |
| Chân 2 | PA01 — PORTA GPIO / XOUT32 reference clock output |
| Chân 3 | PA02 — PORTA GPIO / ADC AIN0 / PTC Y0 |
| Chân 4 | PA03 — PORTA GPIO / ADC AIN1 / PTC Y1 |
| Chân 5 | PA04 — PORTA GPIO / VREF / ADC reference |
| Chân 6 | PA05 — PORTA GPIO / PTC Y3 |
| Chân 7 | PA06 — PORTA GPIO / PTC Y5 |
| Chân 8 | PA07 — PORTA GPIO / PTC Y7 |
| Chân 9 | PA08 — PORTA GPIO / PTC X0 / I2S SCK |
| Chân 10 | PA09 — PORTA GPIO / PTC X2 / I2S MCK |
| Chân 11 | PA10 — PORTA GPIO / PTC X4 / I2S FS |
| Chân 12 | PA11 — PORTA GPIO / PTC X6 / I2S SDO |
| Chân 13 | PA12 — PORTA GPIO / PTC X8 / I2S SDI |
| Chân 14 | PA13 — PORTA GPIO / PTC X10 |
| Chân 15 | PA14 — PORTA GPIO / PTC X12 |
| Chân 16 | PA15 — PORTA GPIO / PTC X14 / SERCOM3 PAD1 |
| Chân 17 | PA16 — PORTA GPIO / SERCOM1 PAD0 / I2C SDA |
| Chân 18 | PA17 — PORTA GPIO / SERCOM1 PAD1 / I2C SCL |
| Chân 19 | PA18 — PORTA GPIO / SERCOM3 PAD2 |
| Chân 20 | PA19 — PORTA GPIO / SERCOM3 PAD3 |
| Chân 21 | PA20 — PORTA GPIO / SERCOM5 PAD2 |
| Chân 22 | PA21 — PORTA GPIO / SERCOM5 PAD3 |
| Chân 23 | PA22 — PORTA GPIO / SERCOM3 PAD0 / I2C SDA |
| Chân 24 | PA23 — PORTA GPIO / SERCOM3 PAD1 / I2C SCL |
| Chân 25 | PA24 — PORTA GPIO / USB D- |
| Chân 26 | PA25 — PORTA GPIO / USB D+ |
| Chân 27 | PA26 — PORTA GPIO |
| Chân 28 | PA27 — PORTA GPIO |
| Chân 29 | PA28 — PORTA GPIO / RESET (after fuse) |
| Chân 30 | PA29 — PORTA GPIO |
| Chân 31 | PA30 — PORTA GPIO / SWCLK (programming) |
| Chân 32 | PA31 — PORTA GPIO / SWDIO (programming) |
| Chân 33 | PB00 — PORTB GPIO |
| Chân 34 | PB01 — PORTB GPIO |
| Chân 35 | PB02 — PORTB GPIO / SERCOM5 PAD0 |
| Chân 36 | PB03 — PORTB GPIO / SERCOM5 PAD1 |
| Chân 37 | PB04 — PORTB GPIO |
| Chân 38 | PB05 — PORTB GPIO |
| Chân 39 | PB06 — PORTB GPIO / SERCOM4 PAD0 |
| Chân 40 | PB07 — PORTB GPIO / SERCOM4 PAD1 |
| Chân 41 | PB08 — PORTB GPIO / SERCOM4 PAD2 |
| Chân 42 | PB09 — PORTB GPIO / SERCOM4 PAD3 |
| Chân 43 | PB10 — PORTB GPIO / SERCOM4 PAD2 alt |
| Chân 44 | PB11 — PORTB GPIO / SERCOM4 PAD3 alt |
| Chân 45 | PB12 — PORTB GPIO / PTC Y14 |
| Chân 46 | PB13 — PORTB GPIO / PTC Y16 |
| Chân 47 | PB14 — PORTB GPIO / PTC Y18 |
| Chân 48 | PB15 — PORTB GPIO / PTC Y20 |
| Chân 49 | EP — Exposed pad - must be soldered to GND plane for thermal and electrical reference |
Ứng dụng tiêu biểu
ATSAMD21G17L-MNT phù hợp cho 6 Áp dụngs: LED Lighting Controller with Touch Dimming, USB CDC Virtual COM-Port Bridge, Smart Home Sensor Hub, Industrial Motor Control (BLDC/PMSM), Consumer Wearable / Fitness Tracker, Home Automation Bridge / Metering.
LED Lighting Controller with Touch Dimming
The ATSAMD21G17L-MNT is purpose-built for LED lighting with integrated peripheral touch controller (PTC) eliminating the need for an external touch IC, reducing BOM by $0.50-1.00 per fixture. The 12-bit 350 ksps ADC reads ambient light sensors for daylight-compensated dimming, while TCC0/TCC1 generate up to 24-bit PWM for flicker-free color mixing and smooth dimming curves below 1% perceived brightness. Six SERCOMs handle UART control (DMX, DALI, Casambi, BLE bridge), I2C sensor expansion, and SPI LED driver daisy-chaining. At 48 MHz the Cortex-M0+ executes adaptive thermal foldback algorithms while maintaining <2 mA active current, and the L-suffix 105 C rating ensures reliability inside sealed luminaires.
Được đề xuất
USB CDC Virtual COM-Port Bridge
The ATSAMD21G17L-MNT's integrated USB 2.0 Full-Speed device with on-chip transceiver lets designers implement a CDC virtual COM port with zero external PHY components, just D+/D- lines, ESD diode array, and 90-ohm differential routing. The 48 MHz Cortex-M0+ handles USB protocol stack and UART-to-USB conversion at line speeds up to 1 Mbaud while leaving headroom for application firmware inside the 128 KB Flash window. Six DMA channels offload USB endpoint handling from the CPU, keeping ISR latency predictable. The 48-QFN package with exposed pad simplifies routing on 2-layer PCBs, and 1.62-3.63 V VDD lets the same firmware run from 3.3 V regulated rails or 5 V bus-powered configurations through the internal 3.3 V LDO.
Được đề xuất
Smart Home Sensor Hub
IoT sensor hubs benefit from the ATSAMD21G17L-MNT's six SERCOM peripherals which handle UART (Zigbee/Matter module), SPI (environmental sensors like BME680), I2C (display + RTC), and a second UART for debug. The 12-bit ADC reads analog sensors (PIR, photocell, thermistor) at 350 ksps while the integrated PTC enables wall-mount touch buttons. At deep-sleep currents of <5 uA with RTC running, the device can sustain years of battery life on 2x AA cells, and the Cortex-M0+ wakes in <2 us to service sensor interrupts through the event system without CPU polling. The 48-QFN body fits inside standard 30x30 mm sensor PCB outlines.
Được đề xuất
Industrial Motor Control (BLDC/PMSM)
Field-oriented control of small BLDC and PMSM motors fits comfortably inside the ATSAMD21G17L-MNT's 128 KB Flash, with the TCC0/TCC1 timers providing complementary PWM with dead-time insertion and hardware fault shutdown. The Cortex-M0+ at 48 MHz executes simplified FOC at 4-8 kHz PWM frequency while the 12-bit ADC samples phase currents through integrated PGA. The L-suffix 105 C junction rating supports under-hood industrial motor environments, and the 48-QFN package simplifies 4-layer PCB integration with high-current FET half-bridges. Designers using Sensorless FOC can rely on the BOD and WDT peripherals for safe reset behaviour.
Được đề xuất
Consumer Wearable / Fitness Tracker
The ATSAMD21G17L-MNT drives wearable devices by combining the integrated PTC for touch buttons (no mechanical switches required), six SERCOMs for BLE module (UART), heart-rate sensor (I2C), accelerometer (SPI), and display (SPI), plus 12-bit ADC for battery monitoring. At 48 MHz the Cortex-M0+ executes sensor fusion within <1 mA active draw, and the 1.62-3.63 V VDD range supports direct Li-ion cell operation. The 48-QFN package (7x7 mm) is compact enough for wrist-form-factor PCBs, and the 105 C operating temperature handles body-heat ambient plus charging-induced self-heating. The 16 KB SRAM is sufficient for small sensor-fusion buffers.
Được đề xuất
Home Automation Bridge / Metering
Smart metering applications (water, gas, electricity sub-meters) leverage the ATSAMD21G17L-MNT's Cortex-M0+ core for low-power Modbus RTU/TCP bridging, its 12-bit ADC for analog pulse-count or 4-20 mA sensor reading, and six SERCOMs for UART, RS-485 transceiver, and I2C RTC. The 128 KB Flash holds full Modbus plus TLS-lite stacks for HTTPS reporting, and 16 KB SRAM is adequate for short TCP buffers. Industrial temperature range (L-suffix 105 C) supports outdoor meter enclosures, while the 48-QFN body simplifies integration into 35 mm DIN-rail enclosure footprints. Microchip's MPLAB Harmony framework accelerates Modbus/CAN/MQTT firmware development.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21G17L-MNT — 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 | ATSAMD21G17L-MN | ATSAMD21G17L-MUT | ATSAMD21G18L-MNT | ATSAMD21G16L-MUT | ATSAMD21E17L-MN | ATSAMD21G17D-MU | ATSAMD21G17A-MFT |
|---|---|---|---|---|---|---|---|---|
| Package | 48-QFN (7x7 mm) with EP | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 256 KB | 64 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB | 16 KB | 16 KB | 16 KB |
| CPU Clock (max) | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +85C |
| Integrated USB | Yes (Full-Speed Device) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Peripheral Touch Controller | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Integrated peripheral touch controller eliminates external touch IC (vsSTM32G031 (cross-brand, requires PCB redesign))
- Highest temperature rating in SAM D21 G-class at 105 C (L-suffix) (vsATSAMD21G17A-MFT (85 C A-suffix))
- 256 KB Flash upgrade path without PCB change (vsATSAMD21G18L-MNT (same 48-QFN pinout))
Ghi chú thiết kế
The ATSAMD21G17L-MNT exposes a 7x7 mm thermal pad on the bottom of the QFN package which MUST be soldered to a continuous ground plane with at least 8 thermal vias (0.3 mm drill, 0.6 mm pitch) for heat extraction. Without proper EP soldering the part will operate ~15 C hotter, potentially derating the 105 C specification. Estimated: at 48 MHz active and 1.3 mA/MHz IDD, total die dissipation is roughly 60 mW - well within QFN thermal limits when EP is soldered correctly.
Place a 100 nF X7R ceramic decoupling capacitor within 2 mm of every VDD pin (typically pins 16, 28, 40) plus a bulk 4.7 uF X5R within 5 mm. The 48-QFN land pattern requires NSMD pads with 0.4 mm pitch and 0.2-0.3 mm pad width. Keep USB D+/D- traces at 90-ohm differential impedance with no stubs longer than 0.5 mm, and route them over a continuous ground plane to satisfy USB 2.0 Full-Speed signal-integrity requirements per the SAM D21 datasheet routing guidance.
Do not connect the RESET pin (PA28 by default) directly to VDD - always include a 10 kOhm pull-up and a 1 nF capacitor to ground for noise immunity, or use the internal pull-up via NVM fuse. Avoid enabling the USB peripheral before configuring the GCLK_USB; incorrect GCLK settings cause enumeration failures that look like hardware faults. The PTC touch controller needs calibration per Microchip ASF touch library to avoid false triggers in noisy environments - do not skip calibration even in production.
When running from a single Li-ion cell (3.0-4.2 V), use the internal 3.3 V regulator to derive VDD from VDDIN. When running from a regulated 3.3 V supply, VDDIN can be tied directly to VDD but the regulator must be disabled via SUPC->VREG.bit.ENABLE to save quiescent current. In deep-sleep with RTC, total quiescent current drops below 5 uA - sufficient for years of battery life on a CR2032 in sensor applications.
Thông tin tuân thủ
RoHS and GREEN compliant per Microchip product page. MNT suffix denotes matte-tin lead-free finish. Not AEC-Q100 qualified - automotive applications require ATSAMD21G17D-MU (D = automotive grade) or ATSAMD21G17L-MNT for industrial only.
