The in-vehicle air conditioner controller is a crucial component of the vehicle comfort system, designed to precisely regulate interior temperature, wind speed, and airflow direction. Additional features, such as air purification and humidity control, enhance passenger comfort. With increasing focus from automakers and consumers on driving comfort, the functionality and intelligence of in-vehicle air conditioner controllers have become critical indicators of vehicle quality.

The rising emphasis on advanced automotive technology and environmental standards has significantly increased the demand for efficient and intelligent air conditioner controllers. These systems comprise multiple modules, including MCUs, power supply units, display panels, sensor modules, actuator units, motors, and high-/low-side drivers, with the MCU serving as the core to ensure anti-interference performance and reliability.

G32A1445 In-Vehicle Air Conditioner Controller Overview

The automotive environment demands exceptional reliability and stability. Selecting an MCU for in-vehicle air conditioner controllers requires careful consideration of automotive-specific challenges, including temperature fluctuations, vibrations, and electromagnetic interference. To address these design and functional requirements, Geehy’s G32A1445-based air conditioner controller solution has entered mass production and is ready for deployment in vehicles. This solution supports temperature regulation, wind speed control, air distribution, automatic mode selection, dehumidification, air purification, rear window defogging, timer control, status display, and fault diagnosis—ensuring optimal comfort in automotive environments.

The automotive G32A1445 MCU integrates seamlessly with display panels, sensors, actuators, control modules, and refrigerant circulation systems to form a robust air conditioning control system. It regulates airflow by controlling the fan motor via LPSPI, processes actuator input signals for AC, defrosting, and pressure switch feedback, and enables diagnostic and status display functions. Additionally, the MCU transmits system status to the display panel of air conditioners through the LIN bus, ensuring precise and efficient performance.

Block Diagram of the G32A1445 In-Vehicle Air Conditioner Controller Solution

Features of the G32A1445 In-Vehicle Air Conditioner Controller Solution

· Integrates a CFGTMR timer module to drive applications such as blower motors, compressors, and stepper motors, supporting HVAC functions like heating, cooling, ventilation, air purification, and dehumidification.

· Features a multi-channel ADC (4 temperature sensors, 1 humidity sensor, 2 ambient sensors) for seamless acquisition of diverse sensor data. 

· Enables CAN bus communication to transmit real-time air conditioning status to the vehicle’s CAN network, facilitating precise control of components like the air conditioning compressor, PTC, and blower motor.

· Supports fault detection functions, including over-voltage, under-voltage, over-current, and over-temperature protection, to enhance system reliability and safety.

· Complies with 2.0A/2.0B (active) standards, with a communication speed of up to 1 Mbit/s, ensuring stable and fast CAN bus communication; offers upgradeability to the CANFD protocol, supporting data lengths up to 64 bytes and bit rates up to 8 Mbit/s.

Key Features of the Automotive G32A1445 MCUs

Geehy is committed to addressing the growing complexity of automotive system designs by delivering reliable, high-performance chip solutions for diverse automotive applications. The mass-production solutions based on the G32A1445/1465 series MCUs enable innovation and advancement in smart vehicle systems, including safety, power management, control, and infotainment systems.