Texas Instruments BQ769142, Manual

Page: 2 / 80

Table of Contents
1 Features ............................................................................ 1
2 Applications ..................................................................... 1
3 Description ....................................................................... 1
4 Revision History .............................................................. 3
5 Device Comparison Table ............................................... 4
6 Pin Configuration and Functions ................................... 4
7 Specifications .................................................................. 7
7.1 Absolute Maximum Ratings ....................................... 7
7.2 ESD Ratings .............................................................. 8
7.3 Recommended Operating Conditions ........................ 9
7.4 Thermal Information bq769142 ................................ 10
7.5 Supply Current ......................................................... 10
7.6 Digital I/O ................................................................. 11
7.7 LD Pin ...................................................................... 12
7.8 Precharge (PCHG) and Predischarge (PDSG)
FET Drive ................................................................... 12
7.9 FUSE Pin Functionality ............................................ 12
7.10 REG18 LDO ........................................................... 12
7.11 REG0 Pre-regulator ............................................... 13
7.12 REG1 LDO ............................................................. 13
7.13 REG2 LDO ............................................................. 14
7.14 Voltage References ................................................ 14
7.15 Coulomb Counter ................................................... 15
7.16 Coulomb Counter Digital Filter (CC1) .................... 15
7.17 Current Measurement Digital Filter (CC2) ............. 15
7.18 Current Wake Detector .......................................... 16
7.19 Analog-to-Digital Converter .................................... 16
7.20 Cell Balancing ........................................................ 18
7.21 Cell Open Wire Detector ........................................ 18
7.22 Internal Temperature Sensor ................................. 18
7.23 Thermistor Measurement ....................................... 18
7.24 Internal Oscillators ................................................. 19
7.25 High-side NFET Drivers ......................................... 19
7.26 Comparator-Based Protection Subsystem ............. 20
7.27 Timing Requirements - I
2
C Interface, 100kHz
Mode .......................................................................... 22
7.28 Timing Requirements - I
2
C Interface, 400kHz
Mode .......................................................................... 22
7.29 Timing Requirements - HDQ Interface ................... 23
7.30 Timing Requirements - SPI Interface ..................... 24
7.31 Interface Timing Diagrams...................................... 24
7.32 Typical Characteristics............................................ 26
8 Device Description ........................................................ 31
8.1 Overview................................................................... 31
8.2 BQ769142 Device Versions...................................... 31
8.3 Functional Block Diagram......................................... 32
8.4 Diagnostics............................................................... 32
9 Device Configuration .................................................... 33
9.1 Commands and Subcommands................................ 33
9.2 Configuration Using OTP or Registers...................... 33
9.3 Device Security......................................................... 33
9.4 Scratchpad Memory.................................................. 33
10 Measurement Subsystem ........................................... 34
10.1 Voltage Measurement............................................. 34
10.2 General Purpose ADCIN Functionality................... 35
10.3 Coulomb Counter and Digital Filters....................... 36
10.4 Synchronized Voltage and Current Measurement.. 36
10.5 Internal Temperature Measurement........................ 36
10.6 Thermistor Temperature Measurement................... 37
10.7 Factory Trim of Voltage ADC.................................. 37
10.8 Voltage Calibration (ADC Measurements).............. 38
10.9 Voltage Calibration (COV and CUV Protections).... 38
10.10 Current Calibration................................................ 39
10.11 Temperature Calibration........................................ 39
11 Primary and Secondary Protection Subsystems ...... 40
11.1 Protections Overview.............................................. 40
11.2 Primary Protections................................................. 40
11.3 Secondary Protections............................................ 41
11.4 High-Side NFET Drivers.......................................... 42
11.5 Protection FETs Configuration and Control............. 43
11.6 Load Detect Functionality........................................ 43
12 Device Hardware Features .......................................... 44
12.1 Voltage References................................................. 44
12.2 ADC Multiplexer...................................................... 44
12.3 LDOs....................................................................... 44
12.4 Standalone Versus Host Interface.......................... 45
12.5 Multifunction Pin Controls....................................... 45
12.6 RST_SHUT Pin Operation...................................... 46
12.7 CFETOFF, DFETOFF, and BOTHOFF Pin
Functionality................................................................ 46
12.8 ALERT Pin Operation............................................. 46
12.9 DDSG and DCHG Pin Operation............................ 47
12.10 Fuse Drive............................................................. 47
12.11 Cell Open Wire...................................................... 48
12.12 Low Frequency Oscillator..................................... 48
12.13 High Frequency Oscillator..................................... 48
13 Device Functional Modes ........................................... 48
13.1 Overview................................................................. 48
13.2 NORMAL Mode....................................................... 49
13.3 SLEEP Mode.......................................................... 49
13.4 DEEPSLEEP Mode................................................. 50
13.5 SHUTDOWN Mode................................................. 50
13.6 CONFIG_UPDATE Mode........................................ 51
14 Serial Communications Interface ............................... 51
14.1 Serial Communications Overview........................... 51
14.2 I
2
C Communications............................................... 52
14.3 SPI Communications.............................................. 53
14.4 HDQ Communications............................................ 59
15 Cell Balancing .............................................................. 60
15.1 Cell Balancing Overview......................................... 60
16 Application and Implementation ................................ 61
16.1 Application Information........................................... 61
16.2 Typical Applications................................................ 61
16.3 Random Cell Connection Support.......................... 67
16.4 Startup Timing......................................................... 68
16.5 FET Driver Turn-Off................................................ 69
16.6 Unused Pins............................................................ 71
17 Power Supply Requirements ...................................... 72
18 Layout ........................................................................... 72
18.1 Layout Guidelines................................................... 72
18.2 Layout Example...................................................... 73
19 Device and Documentation Support .......................... 76
19.1 Third-Party Products Disclaimer............................. 76
19.2 Documentation Support.......................................... 76
19.3 Support Resources................................................. 76
19.4 Trademarks............................................................. 76
BQ769142
SLUSE91A – SEPTEMBER 2020 – REVISED FEBRUARY 2021
www.ti.com
2 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: BQ769142