A31L123LU

The A31L123LU is an ultra‑low power microcontroller based on the 32‑bit ARM Cortex‑M0+ core, offering 64 Kbytes of Flash and 8 Kbytes of SRAM. Designed for battery‑operated and space‑constrained designs, it combines a low‑power architecture with an integrated set of analog, timing and communication peripherals.

Targeted application areas include smart meters, building and home control, IoT and wireless sensor nodes, and portable consumer and healthcare devices. Key value comes from its low supply voltage range, comprehensive peripheral set and compact 24‑QFN package for embedded designs.

Key Features

• Core High‑performance ARM Cortex‑M0+ 32‑bit processor running up to 32 MHz for efficient control and signal processing.
• Memory 64 Kbytes internal Flash and 8 Kbytes SRAM with a 32‑byte backup register for non‑volatile code storage and runtime data retention.
• Power and Low‑Power Modes Wide supply range from 1.65 V to 3.6 V. Measured consumption figures include 78 μA/MHz in Run mode, 12 μA in Run mode with low‑frequency clocks, 1.3 μA in Deep Sleep with RTCC and retention, and 0.6 μA in Deep Sleep with power control; wakeup time from any power mode is 8 μs.
• Timers and RTC Real‑time clock and calendar plus multiple general‑purpose timers supporting periodic, one‑shot, PWM and capture; includes a 24‑bit watchdog timer for system reliability.
• Analog and Data Conversion 12‑bit ADC (9 channels) with up to 1 Msps sampling and integrated comparators for sensor interfacing and analog signal monitoring.
• Interfaces and Communication Rich serial connectivity including I2C and SPI plus UART/USART interfaces for peripheral communications.
• Display and Smart‑Card Support Integrated LCD driver/controller (up to 8×29 segments) for user interfaces.
• DMA, CRC and System DMA channels for low‑overhead data movement, CRC generator and a 128‑bit unique ID; SWD debug interface for development and debugging.
• Package and Temperature Compact 24‑QFN package (4×4×0.75T‑0.5 mm) and industrial operating temperature range of −40 °C to +105 °C.

Typical Applications

• Smart Meters — Low‑power operation, precision ADC and real‑time clock make it suitable for metering and long‑lifetime deployments.
• Building & Home Control — Integrated I/O, timers, LCD driver and low standby currents enable battery‑friendly door locks, controllers and smart sensors.
• IoT and Wireless Sensor Nodes — Small package, low supply voltage and deep‑sleep modes reduce BOM and extend battery life in sensor and gateway applications.
• Portable Healthcare & Consumer Electronics — ADC, comparators and compact footprint support portable measurement and user‑interface designs.

Unique Advantages

• Highly integrated peripheral set: On‑chip ADC, comparators, LCD driver, timers, DMA and communication interfaces reduce external components and simplify BOM.
• Optimized for low power: Multiple low‑power modes with sub‑microamp deep‑sleep currents and fast 8 μs wakeup time minimize energy usage in battery‑powered designs.
• Flexible supply and clocking: Operates from 1.65 V to 3.6 V with internal and external oscillator support to match a range of system power and frequency requirements.
• Compact, industrial‑range package: 24‑QFN 4×4 mm package and −40 °C to +105 °C operating range enable space‑constrained and robust embedded designs.
• System reliability and traceability: Built‑in watchdog timer, CRC generator and a 128‑bit unique ID support dependable operation and device identification.
• Developer and production friendliness: SWD debug interface and internal Flash simplify development, programming and field updates.

Why Choose A31L123LU?

The A31L123LU positions itself as a compact, ultra‑low power microcontroller that balances a capable ARM Cortex‑M0+ core with a comprehensive set of on‑chip peripherals for sensing, user‑interface and communication tasks. Its combination of low standby/current draw, integrated display support, and compact QFN packaging make it well suited to designers of battery‑operated products and space‑limited embedded systems.

Choose the A31L123LU for designs that require verified low‑power behavior, a rich peripheral mix, and industrial temperature performance—enabling scalable, robust solutions across metering, access control, IoT and portable device markets.

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