ATSAML22J18A-AUT - 32MHz Cortex-M0+ MCU 256KB Flash | Microchip
MPN: ATSAML22J18A-AUT ✓ Hoạt độngATSAML22J18A-AUT Tóm tắt
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals on a single die. The SAM L22 belongs to the ultra-low-power MCU category within the broader ARM Cortex-M0+ family, positioned between 8-bit MCUs and Cortex-M4 application processors in terms of performance and energy efficiency. It integrates an LCD segment driver, capacitive touch (PTC) hardware, and USB device support, making it a true system-on-chip for battery-powered human-machine interface products.
Key features include Segment LCD driver (up to 8 common x 40 segment), 16-channel 12-bit ADC with hardware oversampling, 3-channel 10-bit DAC, two I2C and four SERCOM-configurable serial interfaces, full-speed USB 2.0 device, 12-channel PTC for touch sensing, and an AES-256 crypto accelerator. The integrated 32.768 kHz crystal oscillator enables RTC accuracy of ±5 ppm across 0-50 °C. The device supports Sleep, Idle, Standby, and Backup power domains, with fast wake-up from 1.5 µs from Standby.
Architecturally, the SAM L22 uses Microchip's proprietary picoPower technology with an event system that allows peripherals to communicate without CPU intervention, drastically reducing active time and average power. The ARM Cortex-M0+ core delivers 0.9 DMIPS/MHz via the Thumb-2 subset, and the single-cycle 32x32 hardware multiplier handles DSP-like operations for sensor fusion and audio effects.
Typical applications include battery-powered IoT sensor nodes with segment-LCD displays, wearable health and fitness bands with capacitive touch buttons, smart utility meters, electronic shelf labels (ESL), medical dosing pumps, asset tracking tags, and portable industrial HMI panels. The 256 KB Flash comfortably hosts USB stacks, graphics libraries, and over-the-air update bootloaders.
When designing with this part, choose the 64-TQFP package when your board has spare area and you need maximum I/O access; for smaller footprints consider the QFN variant. Always include a 32.768 kHz crystal across pins XIN32/XOUT32 for accurate RTC, and ensure VDDIO and VDDC decoupling with 100 nF X7R capacitors placed within 3 mm of each pin.
This page synthesizes distributor pricing, drop-in alternatives within the SAM L22 family, and practical low-power design notes not found in the manufacturer datasheet summary alone.
Bộ thay thế dễ dàng lắp đặt cho ATSAML22J18A-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 ATSAML22J18A-AUT (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Serial Interfaces, Mounting Type, SRAM.
ATSAML22J17A-AUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAML22G18A-AUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAML21J18B-AUT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAML22J18A-AUT Tỷ lệ tối đa & tính chất điện
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-Bit Single-Core |
| Maximum CPU Speed | 32 MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| Active Current (CoreMark) | 39 µA/MHz |
| Backup Mode Current (RTC) | 490 nA |
| Hộp | 64-TQFP (10x10 mm) |
| Nhiệt độ hoạt động | -40 °C to +85 °C (AUT grade) |
| Connectivity | I²C, SPI, UART, USB 2.0 Full-Speed Device |
| Peripherals | Segment LCD, 12-bit ADC, 10-bit DAC, PTC (touch), AES-256, RTC |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
Hướng dẫn cấu hình chân ATSAML22J18A-AUT 64-tqfp (10x10 mm)
Cấu hình chân cho ATSAML22J18A-AUT (64-tqfp (10x10 mm) gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho ATSAML22J18A-AUT.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
ATSAML22J18A-AUT phù hợp cho 6 Áp dụngs: Battery-Powered IoT Sensor Node with LCD Display, Wearable Health and Fitness Tracker, Smart Utility Meter (Water/Gas/Heat), Electronic Shelf Label (ESL) Display Tag, Portable Industrial HMI Panel, Medical Dosing Pump Controller.
Battery-Powered IoT Sensor Node with LCD Display
The ATSAML22J18A-AUT's 490 nA backup current with RTC and integrated Segment LCD controller make it ideal for wireless sensor nodes that display readings on a low-power glass LCD. The 256 KB Flash comfortably hosts an LoRaWAN or BLE 5.x stack alongside application code, while the 32 KB SRAM supports network buffers and sensor processing. Its 39 µA/MHz active current lets a typical 1% duty-cycle sensor node operate for 5+ years on a single CR2477 coin cell. The integrated PTC peripheral also allows capacitive touch buttons on the same PCB without a dedicated touch IC.
Được đề xuất
Wearable Health and Fitness Tracker
Wearable fitness bands require ultra-low standby current, integrated touch for UI buttons, and a small segment or TFT display. The ATSAML22J18A-AUT's 490 nA backup current preserves battery life when the device is idle, and the 12-channel PTC peripheral enables reliable touch sensing through plastic enclosures. The Cortex-M0+ core at 32 MHz handles heart-rate, step-count, and BLE stack processing without exceeding the device's thermal envelope. The integrated 12-bit ADC with hardware oversampling achieves effective 16-bit noise-free resolution for bio-impedance measurements.
Được đề xuất
Smart Utility Meter (Water/Gas/Heat)
Smart meters demand 10+ year battery life, tamper detection, and reliable RTC timekeeping. The ATSAML22J18A-AUT's ultra-low-power backup domain with RTC and tamper-detection pins allows a smart meter to maintain timekeeping and event logging for a decade on a single lithium primary cell. The 256 KB Flash holds AMI communication stacks (Wireless M-Bus, LoRaWAN, Sigfox) plus segmented application firmware, and the Segment LCD driver displays consumption and status on a low-power glass indicator without extra hardware.
Được đề xuất
Electronic Shelf Label (ESL) Display Tag
Electronic shelf labels require years of battery life, low-power wireless update capability, and an integrated e-paper or LCD segment display interface. The ATSAML22J18A-AUT combines a Cortex-M0+ core with an integrated Segment LCD controller to drive 8x40 segment displays directly. The 490 nA RTC backup current enables ESL batteries to last 5-7 years under typical refresh duty cycles, while the AES-256 hardware accelerator secures over-the-air price updates. The 64-TQFP package provides access to all SERCOM peripherals for SPI, I²C, or proprietary RF interfaces.
Được đề xuất
Portable Industrial HMI Panel
Industrial HMI panels with capacitive touch screens and segment LCD readouts require deterministic real-time response and robust ESD/EMI immunity. The ATSAML22J18A-AUT's event system allows peripherals to wake the CPU only when needed, reducing average power in battery-assisted industrial tools. The integrated 12-channel PTC handles up to 12 capacitive buttons or sliders, eliminating a separate touch controller and BOM cost. The USB 2.0 Full-Speed device interface supports firmware updates and configuration via standard micro-USB cables.
Được đề xuất
Medical Dosing Pump Controller
Medical dosing pumps demand IEC 62304-compliant firmware with deterministic timing and reliable watchdog operation. The ATSAML22J18A-AUT's Cortex-M0+ core running at 32 MHz executes closed-loop flow control with 1 ms cycle times, while the WDT and RTC provide certified fail-safe behavior. The integrated 12-bit ADC with hardware oversampling achieves 16-bit effective resolution for precise flow-rate sensing, and the Segment LCD displays dose volume and alarm status. The 256 KB Flash holds application firmware plus a certified bootloader with secure firmware update via the USB device port.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAML22J18A-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 | ATSAML22J17A-AUT | ATSAML22G18A-AUT | ATSAML21J18B-AUT | STM32L073RZ |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (same) | 64-TQFP (same) | 64-TQFP (same) | 64-LQFP (similar but pin-mapped differently) |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max CPU Speed | 32 MHz | 32 MHz | 32 MHz | 48 MHz | 32 MHz |
| Flash Memory | 256 KB | 128 KB | 256 KB | 256 KB | 192 KB |
| SRAM | 32 KB | 16 KB | 32 KB | 32 KB | 20 KB |
| Segment LCD Controller | Yes (8x40) | Yes (8x40) | No | No | Yes (8x44) |
| AES-256 Accelerator | Yes | Yes | Yes | Yes | Yes (AES-128 + AES-256) |
Bảo phân biệt quan trọng
- Integrated Segment LCD Controller up to 8x40 segments (vsATSAML21J18B-AUT)
- 12-channel hardware Peripheral Touch Controller (PTC) (vsSTM32L073RZ)
- 490 nA RTC backup current - 56% lower than closest competitor (vsSTM32L073RZ)
Ghi chú thiết kế
Estimated: at 32 MHz active mode the ATSAML22J18A-AUT draws ~1.25 mA from a 3.3 V supply while running CoreMark. For battery-powered designs, use the event system to wake the CPU only on peripheral interrupts (PTC, RTC, ADC window) and spend >99% of the time in Standby or Backup mode. A typical 1% duty-cycle sensor node with this device averages <20 µA continuous current, enabling 5+ year operation on a 240 mAh CR2032 coin cell.
Place 100 nF X7R decoupling capacitors within 3 mm of each VDDIO and VDDC pin pair, with a shared 4.7 µF bulk capacitor on each supply rail. The USB D+/D- traces must be 90 Ω differential and matched within 150 mils (3.8 mm) of each other. Keep the 32.768 kHz crystal traces short and symmetric, surrounded by a ground guard ring, to achieve the ±5 ppm RTC accuracy spec.
Route all PTC touch sensor traces as short capacitive traces with a 2 mm minimum clearance to ground fills; for moisture robustness use a hatched ground plane beneath the touch sensor area. Segment LCD traces must be routed with minimum 0.15 mm spacing and not cross noisy digital lines to avoid display artifacts. The 64-TQFP exposed pad (if present on this variant) must be soldered to a continuous ground plane for thermal dissipation.
Do not enable the PTC and the ADC on the same analog channel simultaneously - MUX contention can damage the IO. Always configure the NVMCTRL (flash controller) wait states according to the 32 MHz operation section of the datasheet; missing wait states cause Flash read errors under load. Use the BOD33 (Brown-Out Detector) at 1.85 V threshold for battery-powered applications to prevent Flash corruption during brownout events.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Lead-free reflow compatible (MSL3, 260 °C peak). Halogen-free per JEDEC JS709A. AEC-Q100 not applicable for general-purpose industrial MCU - choose ATSAML22J18A-AUT variant for industrial or the E variant for extended-temperature automotive applications.
