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BQ76942 3-Series to 10-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li- Polymer, and LiFePO4 Battery Packs
- SLUSE14B December 2020 – December 2021 BQ76942
  
  PRODUCTION DATA

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BQ76942 3-Series to 10-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li- Polymer, and LiFePO4 Battery Packs

1 Features
2 Applications
3 Description
4 Revision History
5 Device Comparison Table
6 Pin Configuration and Functions
7 Specifications
1. 7.1 Absolute Maximum Ratings
2. 7.2 ESD Ratings
3. 7.3 Recommended Operating Conditions
4. 7.4 Thermal Information BQ76942
5. 7.5 Supply Current
6. 7.6 Digital I/O
7. 7.7 LD Pin
8. 7.8 Precharge (PCHG) and Predischarge (PDSG) FET Drive
9. 7.9 FUSE Pin Functionality
10. 7.10 REG18 LDO
11. 7.11 REG0 Pre-regulator
12. 7.12 REG1 LDO
13. 7.13 REG2 LDO
14. 7.14 Voltage References
15. 7.15 Coulomb Counter
16. 7.16 Coulomb Counter Digital Filter (CC1)
17. 7.17 Current Measurement Digital Filter (CC2)
18. 7.18 Current Wake Detector
19. 7.19 Analog-to-Digital Converter
20. 7.20 Cell Balancing
21. 7.21 Cell Open Wire Detector
22. 7.22 Internal Temperature Sensor
23. 7.23 Thermistor Measurement
24. 7.24 Internal Oscillators
25. 7.25 High-Side NFET Drivers
26. 7.26 Comparator-Based Protection Subsystem
27. 7.27 Timing Requirements – I2C Interface, 100kHz Mode
28. 7.28 Timing Requirements – I2C Interface, 400kHz Mode
29. 7.29 Timing Requirements – HDQ Interface
30. 7.30 Timing Requirements – SPI Interface
31. 7.31 Interface Timing Diagrams
32. 7.32 Typical Characteristics
8 Device Description
1. 8.1 Overview
2. 8.2 BQ76942 Device Versions
3. 8.3 Functional Block Diagram
4. 8.4 Diagnostics
9 Device Configuration
1. 9.1 Commands and Subcommands
2. 9.2 Configuration Using OTP or Registers
3. 9.3 Device Security
4. 9.4 Scratchpad Memory
10Measurement Subsystem
1. 10.1 Voltage Measurement
2. 10.2 General Purpose ADCIN Functionality
3. 10.3 Coulomb Counter and Digital Filters
4. 10.4 Synchronized Voltage and Current Measurement
5. 10.5 Internal Temperature Measurement
6. 10.6 Thermistor Temperature Measurement
7. 10.7 Factory Trim of Voltage ADC
8. 10.8 Voltage Calibration (ADC Measurements)
9. 10.9 Voltage Calibration (COV and CUV Protections)
10. 10.10 Current Calibration
11. 10.11 Temperature Calibration
11Primary and Secondary Protection Subsystems
1. 11.1 Protections Overview
2. 11.2 Primary Protections
3. 11.3 Secondary Protections
4. 11.4 High-Side NFET Drivers
5. 11.5 Protection FETs Configuration and Control
  1. 11.5.1 FET Configuration
  2. 11.5.2 PRECHARGE and PREDISCHARGE Modes
6. 11.6 Load Detect Functionality
12Device Hardware Features
1. 12.1 Voltage References
2. 12.2 ADC Multiplexer
3. 12.3 LDOs
  1. 12.3.1 Preregulator Control
  2. 12.3.2 REG1 and REG2 LDO Controls
4. 12.4 Standalone Versus Host Interface
5. 12.5 Multifunction Pin Controls
6. 12.6 RST_SHUT Pin Operation
7. 12.7 CFETOFF, DFETOFF, BOTHOFF Pin Functionality
8. 12.8 ALERT Pin Operation
9. 12.9 DDSG and DCHG Pin Operation
10. 12.10 Fuse Drive
11. 12.11 Cell Open Wire
12. 12.12 Low Frequency Oscillator
13. 12.13 High Frequency Oscillator
13Device Functional Modes
1. 13.1 Overview
2. 13.2 NORMAL Mode
3. 13.3 SLEEP Mode
4. 13.4 DEEPSLEEP Mode
5. 13.5 SHUTDOWN Mode
6. 13.6 CONFIG_UPDATE Mode
14Serial Communications Interface
1. 14.1 Serial Communications Overview
2. 14.2 I2C Communications Subsystem
3. 14.3 SPI Communications Interface
  1. 14.3.1 SPI Protocol
4. 14.4 HDQ Communications Interface
15Cell Balancing
1. 15.1 Cell Balancing Overview
16Application and Implementation
1. 16.1 Application Information
2. 16.2 Typical Applications
3. 16.3 Random Cell Connection Support
4. 16.4 Startup Timing
5. 16.5 FET Driver Turn-Off
6. 16.6 Unused Pins
17Power Supply Requirements
18Layout
1. 18.1 Layout Guidelines
2. 18.2 Layout Example
19Device and Documentation Support
1. 19.1 Third-Party Products Disclaimer
2. 19.2 Documentation Support
  1. 19.2.1 Receiving Notification of Documentation Updates
3. 19.3 Support Resources
4. 19.4 Trademarks
5. 19.5 Electrostatic Discharge Caution
6. 19.6 Glossary
20Mechanical, Packaging, Orderable Information
IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)

PFB|48
- MTQF019B

Thermal pad, mechanical data (Package|Pins)

Orderable Information

sluse14b_oa
sluse14b_pm

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DATA SHEET

BQ76942 3-Series to 10-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li- Polymer, and LiFePO4 Battery Packs

1 Features

Battery monitoring capability for 3-series to 10-series cells
Integrated charge pump for high-side NFET protection with optional autonomous recovery
Extensive protection suite including voltage, temperature, current, and internal diagnostics
Two independent ADCs
- Support for simultaneous current and voltage sampling
- High-accuracy coulomb counter with input offset error < 1 µV (typical)
- High-accuracy cell voltage measurement < 10 mV (typical)
Wide-range current applications (±200-mV measurement range across sense resistor)
Integrated secondary chemical fuse drive protection
Autonomous or host-controlled cell balancing
Multiple power modes (typical battery pack operating range conditions)
- NORMAL mode: 286 µA
- Multiple SLEEP mode options: 24 µA to 41 µA
- Multiple DEEPSLEEP mode options: 9 µA to 10 µA
- SHUTDOWN Mode: 1 µA
High-voltage tolerance of 85 V on cell connect and select additional pins
Tolerant of random cell attach sequence on production line
Support for temperature sensing using internal sensor and up to nine external thermistors
Integrated one-time-programmable (OTP) memory programmable by customers on production line
Communication options include 400-kHz I²C, SPI, and HDQ one-wire interface
Dual programmable LDOs for external system usage
48-pin TQFP package (PFB)

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