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User's Guide
BQ7961x-Q1 Design Recommendations for High Voltage
Automotive BMS
Taylor Vogt
The BQ79616-Q1 provides high-accuracy cell voltage measurements for 6S to 16S battery modules in <200 µs.
The integrated front end filters enable the system to implement simple, low-cost, differential RC filters on the
cell input channels. The integrated, post-ADC, low-pass filters enable filtered, DC-like, voltage measurements for
better SOC calculation. This device supports autonomous internal cell balancing with temperature monitoring to
auto-pause and resume balancing to avoid an overtemperature condition.
The inclusion of the isolated, bidirectional, daisy chain ports supports both capacitor- and transformer-based
isolation, allowing the use of the most effective components for centralized or distribution architectures
commonly found in the xEV powertrain system. This device also includes eight GPIOs/auxiliary inputs that can
be used for NTC thermistor measurements.
Supply.....................................................................................................................................................................3
3 OTP Programming..................................................................................................................................................................
5 Bus Bar Support...................................................................................................................................................................
6 TSREF....................................................................................................................................................................................
Configuration........................................................................................................................................29
10 Multi-Drop Configuration...................................................................................................................................................
11 Main ADC Digital LPF.........................................................................................................................................................
Guidelines...............................................................................................................................................................39
Performance.................................................................................................................................................................42
16 Revision History.................................................................................................................................................................
Figure 1-1. Power Supply Schematic..........................................................................................................................................
Figure 4-1. Cell Voltage Monitoring.............................................................................................................................................
SLVAE87A - DECEMBER 2020 - REVISED OCTOBER 2023
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ABSTRACT
Table of Contents
(AAF)...........................................................................................................................................38
Noise..............................................................................................................................42
List of Figures
Balancing....................................................................................................................................11
Copyright © 2023 Texas Instruments Incorporated
REFHM............................................................................................4
Device....................................................................................14
Size..................................................................................15
Module.................................................................19
BQ7961x-Q1 Design Recommendations for High Voltage Automotive BMS
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