A31L123KU

The A31L123KU is an ultra-low power microcontroller based on the ARM Cortex-M0+ core, optimized for battery-operated and portable designs. It integrates up to 64 Kbytes of internal flash and 8 Kbytes of SRAM, a broad set of analog and digital peripherals, and multiple low-power modes to support long battery life.

Targeted use cases include smart meters, smart card readers, building and home control, IoT nodes and portable consumer or healthcare devices where low power, integrated peripherals and modest code density are required.

Key Features

• Core ARM Cortex-M0+ 32-bit core running at 32 MHz, providing deterministic control and efficient code execution for embedded applications.
• Memory 64 Kbytes of internal Flash program memory and 8 Kbytes of internal SRAM with a 32-byte backup register for small non-volatile and runtime data storage.
• Operating Voltage Wide supply range from 1.65 V to 3.6 V to support low-voltage battery-powered systems and a variety of power domains.
• Low-Power Modes Ultra-low power technology with measured modes including 78 μA/MHz in run, 12 μA run (using low-frequency clocks), deep sleep at 1.3 μA with RTCC and retention, and 0.6 μA deep sleep with power control. Fast wakeup time of 8 μs from all power modes.
• Analog 12-bit A/D converter (1 Msps) with 10 inputs and two comparators, suitable for sensor interfacing and precision measurements down to 1.65 V operation.
• Timers and RTCC Five general-purpose 16-bit timers providing periodic, one-shot, PWM and capture functions, plus a real-time clock and calendar for timekeeping.
• Communication Interfaces Multiple serial interfaces including USART (supports UART + SPI), UART, an I2C controller (up to 1 Mbps), an SPI controller (up to 16 Mbps) and smart card interfaces for secure reader applications.
• System and Reliability CRC unit (8/16/32-bit), 128-bit unique ID, watchdog timer (24-bit), power-on reset (POR), low-voltage reset (LVR) and low-voltage interrupt (LVI) for robust system management.
• DMA and Debug Five DMA channels for efficient peripheral-to-memory transfers and SWD debug interface for development and debugging.
• Display and I/O Integrated LCD driver supporting up to 8×29 segments and 28 general-purpose I/O pins on the QFN32 package for compact user-interface implementations.
• Package and Temperature Available in a compact 32-QFN (5×5 mm, 0.5 mm pitch) surface-mount package and specified for operation from −40 °C to +105 °C.

Typical Applications

• Smart Meters Onboard 12-bit ADC, low-power operation and RTC/RTCC support accurate measurement and long-term timekeeping in metering designs.
• Smart Card Readers Integrated smart card interfaces and secure communication peripherals simplify reader implementations.
• Building & Home Control Multiple serial buses (I2C, SPI, UART/USART) and LCD driver support sensor networks, user displays and subsystem control in home automation.
• IoT and Wireless Sensor Nodes Low-voltage operation, ultra-low sleep currents and small QFN package make the device suitable for battery-powered sensor nodes and IoT endpoints.
• Portable Consumer & Healthcare Devices Compact flash/SRAM footprint, ADC inputs and low-power modes enable portable instruments with user interfaces and data logging.

Unique Advantages

• Highly integrated peripheral set: On-chip ADC, comparators, LCD driver, DMA, CRC and multiple serial interfaces reduce external components and simplify BOM.
• Optimized for low-power operation: Multiple sleep and deep-sleep modes with sub‑microamp and single‑microamp currents plus 8 μs wakeup minimize energy use in duty-cycled systems.
• Flexible I/O and display support: 28 GPIOs and an LCD driver supporting up to 8×29 segments enable compact user-interface designs without external drivers.
• Compact footprint: 32-QFN (5×5 mm) surface-mount package suits space-constrained applications while providing ample connectivity.
• Wide supply and temperature range: 1.65–3.6 V operation and −40 °C to +105 °C rating support a broad range of industrial and portable environments.
• Efficient data handling: Five DMA channels and hardware CRC offload common data-transfer and integrity tasks from the CPU.

Why Choose A31L123KU?

The A31L123KU combines a Cortex‑M0+ core with a dense set of analog and digital peripherals, efficient power modes and a compact QFN package to address battery-powered and space-constrained embedded applications. Its 64 KB Flash and 8 KB SRAM provide adequate code and data memory for feature-rich, low-power designs while on-chip resources (ADC, comparators, LCD driver, DMA, serial interfaces and RTC) reduce system complexity.

This device is well suited for designers building smart meters, secure card readers, building control nodes, IoT sensors and portable instruments that require a balance of integration, low-power operation and industrial temperature support.

Request a quote or contact sales to discuss pricing, availability and how the A31L123KU can fit your next design.