A31L122CL

The A31L122CL is an ultra-low power microcontroller based on the ARM Cortex-M0+ core, integrating 32 Kbytes of flash memory and 8 Kbytes of SRAM. Designed for battery-operated and embedded control applications, it combines mixed-signal peripherals, multiple communication interfaces and advanced power management for compact, energy-efficient designs.

Typical use cases include smart meters, smart card readers, home/building control, IoT and portable consumer devices where low-power operation, integrated peripherals and compact packaging (48-LQFP) reduce BOM and simplify system design.

Key Features

• Core ARM Cortex-M0+ 32-bit core running up to 32 MHz providing efficient control and deterministic interrupt handling.
• Memory 32 Kbytes internal FLASH and 8 Kbytes SRAM with 32-byte backup register for application code and runtime data.
• Power and Low-Power Modes Operates from 1.65 V to 3.6 V. Ultra-low power figures from the family include 78 µA/MHz in Run mode, 12 µA in low-frequency Run mode, 1.3 µA deep sleep with RTCC and retention, and 0.6 µA deep sleep with power control; typical wake-up time is 8 µs.
• Analog 12-bit A/D converter (up to 1 Msps per datasheet) with device-specific 10-channel ADC inputs and integrated comparators for sensor interfacing and analog measurement.
• Timers and RTC Multiple 16-bit general-purpose timers, five multi-purpose timers (periodic, one-shot, PWM, capture) and a real-time clock/calendar for timing, scheduling and motor or UI control.
• Connectivity Rich serial interfaces including I2C, SPI, USART/UART variants, LPUART and smart card interface for peripheral expansion and host/device communication.
• System Reliability & Security On-chip CRC (8/16/32-bit), POR, LVR, LVI and watchdog timer for runtime integrity and safety monitoring.
• DMA and Debug Five DMA channels for low-overhead data movement and SWD debug interface for development and troubleshooting.
• Display Support Integrated LCD driver/controller supporting segment displays and 16-step contrast control for low-power UI implementations.
• Package & Temperature 48-LQFP mounting type, 38 I/O pins, operating temperature range −40 °C to +105 °C suitable for commercial and industrial designs.

Typical Applications

• Smart Meters — Accurate ADC and low-power RTC enable long-life metering and periodic communication while minimizing energy use.
• Smart Card Readers — Integrated smart card interface with robust power management and multiple UART/USART ports for secure host communication.
• Home & Building Control — Timers, PWM and LCD driver support user interfaces and actuator control in access control, door locks and environmental controllers.
• IoT & Wireless Sensors — Ultra-low standby currents, fast wake-up and multiple serial interfaces allow sensor nodes and battery-powered IoT endpoints to run longer with responsive connectivity.
• Portable Consumer Electronics — Compact 48-LQFP package, mixed-signal peripherals and low-voltage operation simplify compact, battery-powered product designs.

Unique Advantages

• Highly integrated peripheral set: ADC, comparators, LCD driver, smart card interface, timers and multiple serial ports reduce external component count and BOM.
• Optimized for low power: Family power figures and microcontroller sleep modes enable extended battery life in portable and IoT applications.
• Compact package with ample I/O: 48-LQFP with 38 I/O pins provides a balance of size and connectivity for compact system designs.
• Fast wake-up: 8 µs wake-up time from power modes supports responsive systems that switch frequently between active and low-power states.
• Robust system monitoring: POR, LVR, LVI, watchdog and CRC support reliable operation and runtime integrity checks.
• Development and integration friendly: SWD debug and DMA channels streamline development and enable efficient data handling in complex applications.

Why Choose A31L122CL?

The A31L122CL provides a balanced combination of Cortex-M0+ processing, on-chip flash and SRAM, and a broad set of mixed-signal and communication peripherals tailored for low-power embedded designs. Its operating range (1.65–3.6 V), industrial temperature support (−40 °C to +105 °C) and integrated display and smart-card features make it well suited for smart metering, portable consumer devices, IoT nodes and access control systems.

Choose the A31L122CL when you need a compact, low-power MCU with integrated analog resources, multiple serial interfaces and system reliability features to shorten development time, reduce component count and deliver predictable power performance in fielded products.

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