Automotive HVAC control reference design with HMI


Design files


This reference design offers a cost-effective solution for a heating, ventilation, and air conditioning (HVAC) human-machine interface (HMI) application. This reference design incorporates a synchronous step-down converter, multiple channel half-bridge motor driver for brushed DC motors (BDC), multiple channel light-emitting diode (LED) driver, which sets LED light intensity according to the ambient light intensity, that is measured by the ambient light sensor, The high-side switch on this reference design drives various  loads, multiple hall-sensors are used for contactless measurement of the rotary knobs, tracking voltage regulator supplies off board sensors and multiplexer is used to multiplex multiple analog sensor outputs to the microcontrollers analog to digital converter (ADC).

  • Withstands reverse battery protection
  • Drives up to 6 BDC motors
  • Automatic LED dimming based on ambient light intensity
  • Contactless rotation detection for the rotary knobs
  • Fully protected high-side power switch with accurate current sense
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEE8.PDF (5832 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRYX7.ZIP (2300 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRYX6.PDF (1284 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Ambient light sensors

OPT3001-Q1Automotive digital ambient light sensor (ALS) with high-precision human-eye response

Data sheet: PDF | HTML
Analog switches & muxes

SN74LV4051A-Q1Automotive 5-V, 8:1, 1-channel general-purpose analog multiplexer

Data sheet: PDF | HTML
Automotive LED drivers

TLC6C5716-Q1Automotive 16 channel Full diagnostics constant current RGB LED driver

Data sheet: PDF | HTML
Brushed DC (BDC) motor drivers

DRV8912-Q1Automotive, 40-V, 6-A, 12-channel half-bridge motor driver with advanced diagnostics

Data sheet: PDF | HTML
Buck converters (integrated switch)

LMR36006-Q14.2-V to 60-V, 0.6-A ultra-small synchronous step-down converter

Data sheet: PDF | HTML
High-side switches

TPS1H100-Q140-V, 100-mΩ, 1-ch automotive smart high-side switch with adjustable current limit

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7B4250-Q1Automotive 50-mA, off-battery (40-V), adjustable voltage-tracking low-dropout voltage regulator

Data sheet: PDF | HTML
Linear Hall-effect sensors

DRV5055-Q1Automotive, ratiometric linear hall effect sensor with analog output

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Automotive HVAC control reference design with HMI Feb. 01, 2019
Technical article Understanding flap actuators and what drives them in automotive HVAC systems PDF | HTML Apr. 13, 2017

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