Texas Instruments BQ79631EVM, User Manual

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User’s Guide
BQ79631EVM Evaluation Module
ABSTRACT
The BQ79631 Evaluation Module user's guide describes the safety considerations, general features, theory of
operation, hardware setup, and use of the BQ79631 EVM. Throughout this user's guide, the abbreviations
BMS039, EVM, and the term evaluation module are synonymous with the BQ79631EVM unless otherwise
noted. This EVM is an evaluation board for the BQ79631-Q1 to provide monitoring, protecting, and
communications in high voltage environments within EV/HEVs.
Table of Contents
1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines ............................................ 3
2 General Description ................................................................................................................................................................ 6
2.1 Key Features...................................................................................................................................................................... 6
3 Theory of Operation ................................................................................................................................................................ 8
3.1 Single Board....................................................................................................................................................................... 9
3.2 Stacked Systems............................................................................................................................................................... 9
4 Connectors ............................................................................................................................................................................ 11
4.1 Powering the BQ79631EVM............................................................................................................................................. 11
4.2 Primary Input and Output Connectors.............................................................................................................................. 11
4.3 High Voltage Networks..................................................................................................................................................... 13
4.4 Current Sense.................................................................................................................................................................. 17
4.5 GPIO Connections........................................................................................................................................................... 17
5 Quick Start Guide .................................................................................................................................................................. 19
5.1 Launch Pad Connection and Example Code................................................................................................................... 19
5.2 USB2ANY Connection with GUI...................................................................................................................................... 19
6 Physical Dimensions ............................................................................................................................................................ 21
6.1 Board Dimensions............................................................................................................................................................ 21
7 BQ79631-Q1 EVM Schematic, Assembly, Layout, and BOM ............................................................................................ 22
7.1 Schematics....................................................................................................................................................................... 22
7.2 Layout.............................................................................................................................................................................. 28
7.3 Bill of Materials................................................................................................................................................................. 33
List of Figures
Figure 1-1. ................................................................................................................................................................................... 3
Figure 1-2. ................................................................................................................................................................................... 3
Figure 1-3. ................................................................................................................................................................................... 3
Figure 1-4. ................................................................................................................................................................................... 5
Figure 1-5. ................................................................................................................................................................................... 5
Figure 3-1. Typical BMS System with Stacked Modules............................................................................................................. 8
Figure 3-2. BQ79631EVM Bridge Device Configuration............................................................................................................ 10
Figure 4-1. Resistors to Desolder Topside................................................................................................................................. 13
Figure 4-2. Resistors to Desolder Underside............................................................................................................................. 13
Figure 4-3. High Voltage Connections....................................................................................................................................... 14
Figure 4-4. ................................................................................................................................................................................ 14
Figure 4-5. GPIO4 Control Option............................................................................................................................................. 15
Figure 4-6. Buffer Bypass Jumpers........................................................................................................................................... 16
Figure 4-7. Additional FET Option............................................................................................................................................. 17
Figure 6-1. Board Dimensions................................................................................................................................................... 21
Figure 7-1. Power Supply.......................................................................................................................................................... 22
Figure 7-2. AFE......................................................................................................................................................................... 23
Figure 7-3. High Voltage Sense................................................................................................................................................. 24
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SLUUCC3 – FEBRUARY 2021
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