Automotive HVAC control module

Products and reference designs

Automotive HVAC control module

Block diagram

Overview

Our integrated circuits and reference designs for automotive heating, ventilation and air conditioning (HVAC) control modules help accelerate your design through intelligent drive capabilities with enhanced diagnostics and robust sensors for feedback in closed-loop systems as well as performance motor drivers, efficient power supplies and LED drivers.

Design requirements

Automotive HVAC control module designs require:

  • Reduced EMI to optimize system performance.
  • Scalable power and communication interfaces.
  • Fast temperature control by driving of multiple flap actuators in minimal board size.
  • High accuracy to achieve optimal in-cabin temperature, humidity and air quality.
  • Comprehensive diagnostics for fault identification.
  • Minimal drivers to support multiple LEDs with individual dimming and diagnostics.

Block diagram

Find products and reference designs for your system.

HVAC control - control & HMI

M M Damper motor N Damper motor N M M . . .. Damper motor 1 Damper motor 1 M M Blower motor Blower motor Defrost Defrost A/C compressor solenoid A/C compressor solenoid Segment display Segment display HMI switches and switch interface HMI switches and switch interface Car battery Car battery Power supply Power supply Reverse battery protection Reverse battery protection Voltage regulator Voltage regulator Tracking LDO Tracking LDO Watchdog Watchdog Supply voltage supervisor Supply voltage supervisor MCU MCU MCU MCU Load current monitoring Load current monitoring Current sensors Current sensors Blower motor driver Blower motor driver Low-side switch Low-side switch Damper motor driver Damper motor driver High-side switch High-side switch BDC motor driver BDC motor driver Defrost driver Defrost driver High-side/low-side switch High-side/low-side switch A/C compressor controller A/C compressor controller High-side/low-side switch High-side/low-side switch Not valid in EV Not valid in EV Cabin temperature sensor Cabin temperature sensor Temperature sensor Temperature sensor Temperature sensor interface Temperature sensor interface Multiplexer Multiplexer Tell tale indicators Tell tale indicators LED drivers LED drivers Electric expansion valve (heating) Electric expansion valve (heating) Electric expansion valve (cooling) Electric expansion valve (cooling) Refrigerant liquid-gas separator Refrigerant liquid-gas separator Communication interface Communication interface CAN/LIN ESD CAN/LIN ESD CAN CAN LIN LIN For Heat Pump in EV For Heat Pump in EV

Technical documentation

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Type Title Date
Technical article Understanding flap actuators and what drives them in automotive HVAC systems PDF | HTML 30 Aug 2023
White paper How to design heating and cooling systems for HEV/EVs (Rev. A) 21 Jun 2023
White paper HEV/EV용 난방 및 냉방 시스템 설계 방법 (Rev. A) PDF | HTML 11 Jul 2023
White paper Evolution vs. revolution: the building blocks of automotive body electronics 11 Apr 2018
White paper 車體控制模組的系統電源架構 02 Apr 2019
Technical article Driving HVAC system flaps with an integrated, multichannel motor driver PDF | HTML 01 Mar 2024

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