A31L123RL

The A31L123RL is an ultra-low power microcontroller based on an ARM Cortex-M0+ core, offering 64 Kbytes of internal flash and 8 Kbytes of SRAM. Built for battery-operated and embedded systems, it combines a rich peripheral set—including 12-bit ADC, comparators, timers, RTC, DMA and multiple serial interfaces—with low-power modes and fast wake-up for prolonged battery life and responsive operation.

Key Features

• Core  ARM Cortex-M0+ 32-bit core running up to 32 MHz with SWD debug support for standard embedded development workflows.
• Memory  64 Kbytes of internal FLASH program memory and 8 Kbytes of SRAM plus a 32-byte backup register for retained data.
• Power and Low-Power Modes  Operates from 1.65 V to 3.6 V. Typical currents include 78 μA/MHz in Run mode, 12 μA in low-frequency Run mode, 1.3 μA in Deep Sleep with RTCC + retention, and 0.6 μA in Deep Sleep with power control; wake-up time from all power modes is 8 μs.
• Analog  12-bit A/D converter (1 Msps) with 16 input channels and two comparators, suitable for precision sensor interfacing at low voltages down to 1.65 V.
• Timers and RTC  Real Time Clock and Calendar, five general-purpose 16-bit timers supporting periodic, one-shot, PWM and capture modes, plus a Watchdog Timer and low-power timer options.
• Connectivity  Extensive serial interfaces include 1×USART (UART + SPI), 2×UART, 1×LPUART, 2×I2C (up to 1 Mbps), 2×SPI (up to 16 Mbps) and 2 Smart Card (SC) interfaces for secure-reader designs.
• System Reliability & Security  Integrated CRC units (8/16/32-bit), 128-bit unique ID, power-on reset (POR), low-voltage detection (LVD/LVI) and clock monitoring for robust system operation.
• DMA and Peripherals  Five DMA channels to offload data movement, internal RC oscillator plus external clock support, LCD driver/controller for up to 8×29 segments and multiple communication ports for flexible system design.
• GPIO and Package  Up to 52 I/O lines in a 64-LQFP (10×10 mm, 0.5 mm pitch) surface-mount package; operating temperature range −40 °C to +105 °C.

Typical Applications

• Smart Meters  Low-power operation, RTC and ADC channels enable energy-efficient metering and long-term data logging.
• Smart Card Readers  Dual Smart Card interfaces, serial connectivity and low-voltage operation support secure card access and reader control.
• Building & Home Control  Timers, low-power modes and diverse I/O/peripherals make the device suitable for locks, sensors and user-interface management.
• IoT and Wireless Sensor Nodes  Small footprint, deep-sleep retention and multiple comms interfaces support battery-powered sensor and edge devices.
• Portable Healthcare & Consumer Electronics  12-bit ADC, LCD driver and low-power profiles support compact, battery-operated user products and portable instruments.

Unique Advantages

• Highly integrated peripheral set: ADC, comparators, LCD driver, DMA, RTC and multiple serial interfaces reduce BOM and simplify board design.
• Optimized for low-power operation: Multiple run and deep-sleep current figures (down to 0.6 μA) and an 8 μs wake-up time help extend battery life while maintaining responsiveness.
• Flexible voltage range: 1.65 V to 3.6 V operation supports a wide range of battery chemistries and low-voltage sensor interfaces.
• Compact, production-ready package: 64-LQFP (10×10 mm) with up to 52 GPIOs enables feature-rich designs in a manufacturable surface-mount footprint.
• Developer-friendly core and debug: ARM Cortex-M0+ architecture with SWD debug and standard toolchain compatibility streamlines firmware development and validation.
• Robust system features: Integrated CRC, POR, LVD/LVI and clock monitoring support reliability and data integrity in embedded systems.

Why Choose A31L123RL?

The A31L123RL balances a capable ARM Cortex-M0+ core with a broad set of on-chip peripherals and advanced low-power modes, making it a practical choice for designers of battery-powered and embedded devices. Its combination of 64 KB flash, 8 KB SRAM, precision analog, multiple comms interfaces and low standby currents supports compact, energy-efficient system designs across smart metering, secure reader, IoT and portable product segments.

With industry-standard development support for Cortex-M0+ and a selection of production-friendly packages and operating conditions (−40 °C to +105 °C), the A31L123RL offers a scalable platform for engineers seeking a feature-rich, low-power MCU with integrated peripherals to reduce system complexity and time-to-market.

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