Smart Power Switch for Seat Heater Reference Design


Design files


This reference design showcases the TPS1HA08-Q1 device, which is used to control an automotive seat heater. The system consists of a main board and heating element, which represents the resistive heating component found in automotive seat heaters. This system demonstrates the ability to independently control the temperature of each seat as well as provide robust diagnostics and protection to account for fault events. Applications include any type of controlled heating element such as seat heating, climate control, defrosting, glow plugs, and tank heaters.

  • Actively Monitor and Control Resistive Load Heating Element
  • Fault Indication and Analog Sense Output for Accurate Load Current Sensing, Voltage Sensing, and Temperature Sensing
  • TLC59116-Q1 LED Status Indication
  • Open-Load and Short-to-Battery Detection
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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.

TIDUD91.PDF (3500 K)

Reference design overview and verified performance test data

TIDRX31.PDF (421 K)

Detailed schematic diagram for design layout and components

TIDRX35.PDF (54 K)

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

TIDRX33.PDF (239 K)

Detailed overview of design layout for component placement

TIDRX34.ZIP (1169 K)

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

TIDCEV7.ZIP (1028 K)

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

TIDRX32.PDF (1146 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

High-side switches

TPS1HA08-Q140-V, 8-mΩ, 1-ch automotive smart high-side switch with selectable current Limit

Data sheet: PDF | HTML
Analog temperature sensors

LMT84-Q1Automotive Grade, 1.5V-Capable,10 uA Analog Output Temperature Sensor

Data sheet: PDF | HTML
Automotive LED drivers

TLC59116-Q1Automotive 16-channel FM+ I2C-Bus constant-current LED sink driver

Data sheet: PDF | HTML
ESD protection diodes

TPD6F002-Q1Automotive 6-channel 5.5-V ESD protection & EMI Filter for LCD Display Application

Data sheet: PDF | HTML
I2C general-purpose I/Os (GPIOs)

PCF8574A8-bit 2.5- to 5.5-V I2C/SMBus I/O expander with interrupt

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74610-Q10.48-V to 42-V, zero IQ automotive ideal diode controller

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

TPS7B67-Q1Automotive 450-mA, off-battery (40-V), high-PSRR, low-IQ, low-dropout voltage regulator with PG

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17577Q3A30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 6.4 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Smart Power Switch Reference Design for Automotive Seat Heater Sep. 14, 2018

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