Texas Instruments BQ76942 Manuals

Manuals and User Guides for Texas Instruments BQ76942. We have 1 Texas Instruments BQ76942 manual available for free PDF download: Manual

Texas Instruments BQ76942 Manual (85 pages)

High Accuracy Battery Monitor and Protector for Li-Ion, Li- Polymer, and LiFePO4 Battery Packs

Brand: Texas Instruments | Category: Monitor | Size: 4.05 MB

Features
1
Applications
1
Description
1
Table of Contents
2
Revision History
3
Device Comparison Table
4
Pin Configuration and Functions
4
Specifications
7
Absolute Maximum Ratings
7
ESD Ratings
8
Recommended Operating Conditions
8
Thermal Information BQ76942
10
Supply Current
10
Digital I/O
11
LD Pin
11
Precharge (PCHG) and Predischarge (PDSG) FET Drive
11
FUSE Pin Functionality
12
Reg18 Ldo
12
REG0 Pre-Regulator
12
Reg1 Ldo
13
Reg2 Ldo
13
Voltage References
14
Coulomb Counter
14
Coulomb Counter Digital Filter (CC1)
14
Current Measurement Digital Filter (CC2)
15
Current Wake Detector
15
Analog-To-Digital Converter
15
Cell Balancing
17
Cell Open Wire Detector
17
Internal Temperature Sensor
17
Thermistor Measurement
17
Internal Oscillators
17
High-Side NFET Drivers
18
Comparator-Based Protection Subsystem
19
Timing Requirements - I
21
Mode
21
Timing Requirements - I
22
Timing Requirements - HDQ Interface
22
Timing Requirements - SPI Interface
22
Interface Timing Diagrams
23
Typical Characteristics
25
Device Description
31
Overview
31
BQ76942 Device Versions
31
Functional Block Diagram
32
Diagnostics
32
Device Configuration
33
Commands and Subcommands
33
Configuration Using OTP or Registers
33
Device Security
33
Scratchpad Memory
33
Measurement Subsystem
34
Voltage Measurement
34
General Purpose ADCIN Functionality
36
Coulomb Counter and Digital Filters
36
Synchronized Voltage and Current Measurement
37
Internal Temperature Measurement
37
Thermistor Temperature Measurement
37
Factory Trim of Voltage ADC
38
Voltage Calibration (ADC Measurements)
38
Voltage Calibration (COV and CUV Protections)
39
Current Calibration
40
Temperature Calibration
40
Primary and Secondary Protection Subsystems
40
Protections Overview
40
Primary Protections
41
Secondary Protections
41
High-Side NFET Drivers
42
Protection Fets Configuration and Control
43
Load Detect Functionality
44
Device Hardware Features
44
Voltage References
44
ADC Multiplexer
44
Ldos
45
Standalone Versus Host Interface
45
Multifunction Pin Controls
46
RST_SHUT Pin Operation
47
CFETOFF, DFETOFF, BOTHOFF Pin Functionality
47
ALERT Pin Operation
47
DDSG and DCHG Pin Operation
47
Fuse Drive
48
Cell Open Wire
48
Low Frequency Oscillator
49
High Frequency Oscillator
49
Device Functional Modes
49
Overview
49
NORMAL Mode
50
SLEEP Mode
50
DEEPSLEEP Mode
51
SHUTDOWN Mode
51
CONFIG_UPDATE Mode
52
Serial Communications
53
Serial Communications Overview
53
I 2 C Communications Subsystem
53
Interface
53
SPI Communications Interface
54
HDQ Communications Interface
60
Cell Balancing
62
Cell Balancing Overview
62
Application and Implementation
63
Application Information
63
Typical Applications
63
Random Cell Connection Support
70
Startup Timing
70
FET Driver Turn-Off
72
Unused Pins
74
Power Supply Requirements
75
Layout
75
Layout Guidelines
75
Layout Example
75
Third-Party Products Disclaimer
78
Documentation Support
78
Support Resources
78
Trademarks
78
Support
78

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