A31G123RN

The A31G123RN is a 32-bit microcontroller based on the ARM Cortex-M0+ core delivering up to 64 Kbytes of on-chip Flash and 6 Kbytes of SRAM with 40 MHz operation. It combines a broad set of mixed-signal peripherals, display drive capability and robust system-control features in a 64-pin LQFP package for compact embedded designs.

This device targets smart-home and general-purpose applications that require integrated communication interfaces, multi-channel timers and display support, while offering a wide supply range (1.8 V to 5.5 V) and industrial temperature operation.

Key Features

• Core  ARM Cortex-M0+ 32-bit core running at up to 40 MHz for deterministic embedded control.
• Memory  64 Kbytes of Flash program memory and 6 Kbytes of internal SRAM for code and data storage.
• Power and Supply  Operates from 1.8 V to 5.5 V and includes POR, LVR and LVI power management features plus an internal RC oscillator.
• Timers and PWM  Multiple timers including 16-bit and 32-bit timers, a 16-bit timer with 6-channel PWM and support for periodic, one-shot, capture and duty-selectable functions.
• Analog  12-bit ADC (50 ksps) with 14-channel inputs for sensor interfacing and analog measurement.
• Display Drive  Integrated LCD driver/controller supporting up to 8×39 segments with resistor bias and 16-step contrast control.
• Connectivity  Flexible serial interfaces: 3×USART (UART + SPI), 2×UART and 3×I2C for system communications.
• System Reliability  24-bit Watchdog Timer, CRC-16/CCITT generator, clock monitoring and SWD debug interface to support robust firmware development and fault detection.
• I/O and Drive Capability  Up to 61 general-purpose I/O pins in the 64-LQFP package, with up to 120 mA sink current capability across 8 high-current output pins (PD0–PD7).
• Package and Temperature  64-LQFP (14×14-0.8) package option with industrial-grade operation to +105 °C.

Typical Applications

• Smart Door Locks  Control user interfaces, manage sensor inputs and handle secure serial communications with integrated UART/USART and I2C peripherals.
• Air Cleaners  Implement sensor acquisition and system control while driving displays and status LEDs using the built-in ADC and LCD driver.
• General-Purpose Embedded Control  Suitable for compact embedded systems requiring multiple timers, PWM channels and a mix of serial interfaces in a 64-pin footprint.

Unique Advantages

• Highly Integrated Peripheral Set: Combines ADC, LCD controller, multi-channel PWM, CRC and multiple serial interfaces to reduce external components and simplify BOM.
• Flexible Power and Voltage Range: Wide 1.8 V to 5.5 V supply range with POR, LVR and LVI support for reliable operation across varied power environments.
• Display and LED Drive Strength: Built-in LCD driver with 16-step contrast control and dedicated high-current port capability (up to 120 mA sink across eight pins) for direct display and LED interfacing.
• Industrial Temperature Rating: Rated for operation down to −40 °C and up to +105 °C, enabling deployment in demanding environments.
• Compact, High-IO Package: 61 available I/Os in a 64-LQFP package provide ample external connectivity while maintaining a compact board footprint.
• Development and Reliability Support: SWD debug interface, USART-based ISP support, watchdog timer and clock monitoring help accelerate development and increase system robustness.

Why Choose A31G123RN?

The A31G123RN balances a capable ARM Cortex-M0+ core with a comprehensive set of on-chip peripherals—memory, ADC, LCD drive, multiple serial interfaces and robust system-control features—making it well suited for compact appliance, smart-home and general embedded control designs. Its wide supply range, high I/O count and industrial temperature rating deliver design flexibility and long-term reliability for commercial and industrial applications.

Engineers benefit from integrated display and high-current drive capabilities, multiple timers/PWM channels and communications options that simplify hardware design and accelerate time-to-market. On-chip debug and boot/ISP support facilitate development and production programming.

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