ATSAML22J18A-MUT - 32MHz Cortex-M0+ MCU 256KB Flash | Microchip
MPN： ATSAML22J18A-MUT ✓ 啟用中ATSAML22J18A-MUT 概覽
A low-dropout (LDO) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage, dropping only the headroom required by a pass element. In a power-management hierarchy, an LDO sits below a DC-DC switching converter and is used for post-regulation or noise-sensitive rails; for the SAM L22 family specifically, internal LDO and DC-DC blocks support sleep-mode currents in the hundreds of nanoamperes. Understanding this hierarchy helps frame why SAM L22 parts are positioned for always-on sensor nodes rather than high-throughput DSP.
Key features of the ATSAML22J18A-MUT include 39 uA/MHz active current running CoreMark, 490 nA ultra-low-power backup mode with RTC retention, an on-chip 32.768 kHz RTC, and segment LCD support up to 8x36 segments. The integrated PTC (Peripheral Touch Controller) enables capacitive touch sensing without an external IC, and the SERCOM-configurable serial interfaces provide flexible UART/SPI/I2C connectivity. Hardware crypto, true random number generator, and secure boot features support IoT security requirements.
The SAM L22 architecture uses a single-cycle hardware multiplier, single-cycle 32-bit divider option, and a low-power Cortex-M0+ core with Sleepwalking peripherals that wake the CPU only on qualifying events. The device supports 1.62 V minimum supply, allowing direct connection to single-cell Li-ion or 2x AA chemistries without external regulation. Code density is enhanced via Thumb-2 instruction set and Microchip's Atmel Studio/MPLAB X IDE toolchain with FreeRTOS support.
Typical applications include IoT sensor nodes, wearable health monitors, smart home hubs with segment LCD front panels, industrial metering, capacitive touch user interfaces, and battery-powered HVAC controls. The 64-QFN with EP provides a compact footprint for space-constrained PCBAs while the exposed pad improves thermal dissipation for sustained 32 MHz operation.
When designing with this device, plan decoupling per Section 7 of the manufacturer datasheet, route the exposed pad to a contiguous ground copper pour, and configure the LCD charge pump voltage before driving segments. Use sleep modes strategically - Sleepwalking I/O can reduce average current by 10x or more compared with polling. The VDDIO2 supply rail allows independent I/O voltage for mixed-voltage peripherals.
This page synthesizes distributor pricing, drop-in same-package alternatives, and design notes for the ATSAML22J18A-MUT that are not aggregated on the manufacturer datasheet or single distributor pages.
直接替換替代品，適用於 ATSAML22J18A-MUT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAML22J18A-MUT （相同外形與佔位） — 差異在於 Package, Mounting Type, Operating Temperature, Core Architecture, ADC.
ATSAML22J18A-AUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAML22J16A-MUT
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAML22N18A-MUT
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAML21J18B-MUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD21J18A-MUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAML22J18A-MUT 最大額定值與電氣特性
| Core Processor | ARM Cortex-M0+ |
| Core Architecture | 32-bit RISC |
| Series | SAM L22J |
| 最大時脈頻率 | 32 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| 工作溫度 | -40C to +85C (Industrial) |
| Active Current | 39 uA/MHz (CoreMark) |
| Ultra-Low-Power Backup Mode Current | 490 nA (RTC retention) |
| 封裝 | 64-QFN (9x9) with Exposed Pad |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (-MUT suffix) |
| LCD Controller | Segment LCD up to 8x36 segments |
| Capacitive Touch | Integrated PTC (Peripheral Touch Controller) |
| Serial Interfaces | Configurable SERCOM (UART/SPI/I2C) |
| RoHS 狀態 | Compliant |
ATSAML22J18A-MUT 64-qfn (9x9) with exposed pad 腳位配置指南
ATSAML22J18A-MUT（64-qfn (9x9) with exposed pad 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATSAML22J18A-MUT.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAML22J18A-MUT 適用於 6 應用s: IoT Sensor Node with Segment LCD, Wearable Health Monitor, Capacitive Touch User Interface, Industrial Metering with LCD, Smart Home Hub Front Panel, Battery-Powered HVAC Control.
IoT Sensor Node with Segment LCD
The ATSAML22J18A-MUT integrates a segment LCD controller supporting up to 8x36 segments, making it ideal for IoT sensor nodes with on-device display readout. Its 490 nA ultra-low-power backup mode with RTC retention enables multi-year battery life on 2x AA cells, while 39 uA/MHz active current running CoreMark keeps average consumption low during periodic sensor reads. The 256 KB Flash accommodates over-the-air (OTA) firmware update staging buffers alongside application code, and 32 KB SRAM handles BLE/Zigbee stack fragments during radio bursts. Place the exposed pad to a contiguous ground pour for thermal dissipation at sustained 32 MHz operation.
推薦
Wearable Health Monitor
The ATSAML22J18A-MUT suits wearable health monitors due to its 490 nA backup current with RTC, preserving real-time clock across deep sleep cycles between heart-rate or SpO2 measurements. The integrated PTC (Peripheral Touch Controller) eliminates external capacitive touch ICs for skin-contact button interfaces, reducing BOM cost and PCB area. Operating from 1.6 V to 3.6 V allows direct connection to single-cell Li-ion batteries without an external LDO. The 64-QFN 9x9 mm package fits small wrist-form-factor PCBs, and Sleepwalking I/O lets the CPU wake only on qualifying sensor events.
推薦
Capacitive Touch User Interface
The ATSAML22J18A-MUT features integrated PTC hardware that supports self-capacitance and mutual-capacitance touch sensing without external touch ICs, enabling cost-optimized UI designs for appliances, smart locks, and industrial control panels. Its 256 KB Flash accommodates sophisticated gesture recognition algorithms, while SERCOM-configurable UART/SPI/I2C interfaces link to host controllers or wireless modules. The 32 KB SRAM supports touch event queues and debounce state machines. Its 1.6-3.6 V supply range simplifies power tree design in battery or USB-powered appliances.
推薦
Industrial Metering with LCD
The ATSAML22J18A-MUT is well-suited for electricity, water, or gas metering with its integrated 8x36 segment LCD driver that displays consumption values without an external LCD controller IC. Its hardware crypto accelerator and true random number generator support secure metering data logging and anti-tamper protection. The 32 MHz Cortex-M0+ core processes metering pulses in real time while Sleepwalking peripherals monitor pulse inputs without CPU intervention. The 64-QFN package with exposed pad enables compact meter form factors with adequate thermal performance for sustained operation.
推薦
Smart Home Hub Front Panel
The ATSAML22J18A-MUT drives segment LCD front panels on smart home hubs, thermostats, and security keypads with its integrated 8x36 segment controller eliminating the need for external LCD drivers. Its 256 KB Flash accommodates Zigbee or Matter stack fragments alongside application logic, while 32 KB SRAM handles UI rendering buffers. The 490 nA backup current preserves RTC during brown-out events. The 64-QFN 9x9 mm package suits compact hub enclosures, and configurable SERCOM ports connect to host SoCs over UART or SPI for command exchange.
推薦
Battery-Powered HVAC Control
The ATSAML22J18A-MUT powers battery-operated HVAC wireless thermostats with its 490 nA backup current extending battery life beyond typical HVAC sensor replacement cycles. The integrated PTC enables touch-button interfaces on thermostat faceplates, while the segment LCD controller displays setpoint and ambient temperature. Its 1.6-3.6 V supply range supports 2x AA alkaline, 2x AAA lithium, or single-cell Li-ion battery configurations. The Cortex-M0+ core runs at 32 MHz handling PID control loops with deterministic timing, and Sleepwalking I/O reduces average current during idle periods.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAML22J18A-MUT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATSAML22J18A-AUT | ATSAML22J16A-MUT | ATSAML22N18A-MUT | ATSAML21J18B-MUT | ATSAMD21J18A-MUT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 128 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Supply Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| Operating Temperature | -40C to +85C | -40C to +125C (automotive) | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C |
| AEC-Q100 Automotive | No | Yes | No | No | No | No |
| Segment LCD Controller | Yes (8x36) | Yes (8x36) | Yes (8x36) | Yes (8x36) | No | No |
主要差異化特點
- Integrated segment LCD controller on-chip (對比ATSAML21J18B-MUT)
- Ultra-low 490 nA backup current with RTC retention (對比ATSAMD21J18A-MUT)
- Lower cost same-package Flash variant available (對比ATSAML22J16A-MUT)
設計說明
The ATSAML22J18A-MUT supports multiple low-power modes including Active, Idle, Standby, and Backup. Estimated: when using Backup mode with RTC running at 1.8 V supply, the IC draws approximately 490 nA per the datasheet. Use Sleepwalking peripherals to monitor external events without waking the CPU - this reduces average current by 10x or more compared to polling loops. Configure the VREGCTRL register to select the internal LDO or DC-DC converter based on your efficiency versus noise requirements.
The 64-QFN (9x9) package includes an exposed thermal pad that must be soldered to a contiguous ground copper pour of at least 50 mm squared to meet thermal ratings. Estimated: at 32 MHz operation with all peripherals active, internal dissipation remains under 50 mW; however, insufficient ground copper can cause junction temperature rise. For high ambient temperature applications above 70C, consider ATSAML22N18A-MUT with extended -40C to +125C rating.
Place decoupling capacitors as close as possible to each VDD pin: 100 nF ceramic for high-frequency noise and 4.7 uF bulk for transient response. The VDDIO2 supply (when used) requires its own decoupling network. Keep the 32.768 kHz crystal traces short and symmetric to minimize load capacitance mismatch. The exposed pad (EP) should have at least 9 thermal vias (0.3 mm drill) connecting top copper to inner ground plane.
Do not exceed the absolute maximum VDD of 3.8 V - transient spikes from inductive loads or unstable regulators can damage the IC. The segment LCD pins are 5V-tolerant when configured for segment mode but NOT in GPIO mode. When migrating from ATSAMD21 firmware, verify SERCOM peripheral channel mapping as the SAM L22 uses a different multiplexer scheme. Always configure the NVMCTRL lock bits before production to prevent unauthorized Flash access.
合規資訊
RoHS compliant per Microchip product page declaration. Not AEC-Q100 qualified in standard MUT variant - choose ATSAML22J18A-AUT for automotive. Halogen-free per JEDEC JS709B.
