TIDA-020076

Automotive high-voltage BMS reference design: 18S wired or wireless cell supervisor unit

TIDA-020076

Design files

Overview

This reference design implements a cell supervision unit for up to 18 cells. The unit can be daisy-chained to cover typical high-voltage battery ranges used in passenger cars, commercial vehicles, and two- and three-wheelers operating at voltages higher than 72V. The reference design features both wired and wireless interfacing options to enable side-by-side comparison of wired and wireless battery management system (BMS) performance.

Features
  • Cell Supervision Unit (CSU) for 6 to 18 cells, stackable for high-voltage BMS. Optional bus-bar support
  • High-accuracy cell voltage measurement and integrated cell-balancing
  • Wired: Isolated differential daisy chain with optional ring architecture, capacitive and inductive isolation
  • Wireless: wireless state of charge (SoC), ISO26262 and IEC61508 certified on system-level Automotive Safety Integrity Level D (ASIL D) capability
  • Various additional interfacing options for communication and environmental sensor integration: universal asynchronous receiver transmitter (UART), serial peripheral interface (SPI), general purpose IO (GPIO), I2C
  • Optional DCDC for increased system efficiency during key-off and active states
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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.

PDF | HTML
TIDUF92.PDF (1596 KB)

Reference design overview and verified performance test data

SLURB86.PDF (618 KB)

Detailed overview of design layout for component placement

SLURB87.PDF (115 KB)

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

SLURB89.ZIP (6519 KB)

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

SLVC929.ZIP (1341 KB)

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

SLURB88.PDF (3319 KB)

PCB layer plot file used for generating PCB design layout

SLVRBZ6.PDF (831 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

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Data sheet: PDF | HTML
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LM5168-Q1Automotive 6-V to 120-V Wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability

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Battery monitors & balancers

BQ79718B-Q1Automotive, 18-S precise battery monitor, balancer and integrated protector with ASIL-D compliance

Data sheet: PDF | HTML
ESD protection diodes

TPD6E0046 channel 1.6-pF, 5.5-V, 8-kV ESD protection diode for High Speed Interfaces

Data sheet: PDF | HTML
ESD protection diodes

ESD2CAN24-Q1Automotive, dual, 3-pF, ±24-V, ±30-kV ESD protection diode for in-vehicle networks

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Technical documentation

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* Design guide Automotive High-Voltage BMS Reference Design: 18S Wired or Wireless Cell Supervisor Unit PDF | HTML Dec 18, 2025

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