SLUUCJ0 November 2023 BQ76907
- 1
- Read This First
- 1 Introduction
- 2 Device Description
- 3 Device Configuration
- 4 Device Security
- 5 Measurement Subsystem
-
6 Protection
Subsystem
- 6.1 Protections Overview
- 6.2 Protection FET Drivers
- 6.3 Cell Overvoltage Protection
- 6.4 Cell Undervoltage Protection
- 6.5 Short Circuit in Discharge Protection
- 6.6 Overcurrent in Charge Protection
- 6.7 Overcurrent in Discharge 1 and 2 Protections
- 6.8 Current Protection Latch
- 6.9 CHG Detector
- 6.10 Overtemperature in Charge Protection
- 6.11 Overtemperature in Discharge Protection
- 6.12 Internal Overtemperature Protection
- 6.13 Undertemperature in Charge Protection
- 6.14 Undertemperature in Discharge Protection
- 6.15 Host Watchdog Protection
- 6.16 Cell Open Wire Detection
- 6.17 Voltage Reference Measurement Diagnostic Protection
- 6.18 VSS Measurement Diagnostic Protection
- 6.19 REGOUT Diagnostic Protection
- 6.20 LFO Oscillator Integrity Diagnostic Protection
- 6.21 Internal Factory Trim Diagnostic Protection
- 7 Device Status and Controls
- 8 Operational Modes
- 9 I2C Serial Communications
- 10Cell Balancing
-
11Commands and Subcommands
- 11.1 Direct Commands
- 11.2
Bit field Definitions for Direct Commands
- 11.2.1 Safety Alert A Register
- 11.2.2 Safety Status A Register
- 11.2.3 Safety Alert B Register
- 11.2.4 Safety Status B Register
- 11.2.5 Battery Status Register
- 11.2.6 Alarm Status Register
- 11.2.7 Alarm Raw Status Register
- 11.2.8 Alarm Enable Register
- 11.2.9 FET CONTROL Register
- 11.2.10 REGOUT CONTROL Register
- 11.2.11 DSG FET Driver PWM Control Register
- 11.2.12 CHG FET Driver PWM Control Register
- 11.3 Command-only Subcommands
- 11.4 Subcommands with Data
- 11.5 Bit field Definitions for Subcommands
-
12Data Memory
- 12.1 Calibration
- 12.2
Settings
- 12.2.1
Settings:Configuration
- 12.2.1.1 Settings:Configuration:Power Config
- 12.2.1.2 Settings:Configuration:REGOUT Config
- 12.2.1.3 Settings:Configuration:I2C Address
- 12.2.1.4 Settings:Configuration:I2C Config
- 12.2.1.5 Settings:Configuration:DA Config
- 12.2.1.6 Settings:Configuration:Vcell Mode
- 12.2.1.7 Settings:Configuration:Default Alarm Mask
- 12.2.1.8 Settings:Configuration:FET Options
- 12.2.1.9 Settings:Configuration:Charge Detector Time
- 12.2.2 Settings:Cell Balancing
- 12.2.3
Settings:Protection
- 12.2.3.1 Settings:Protection:Enabled Protections A
- 12.2.3.2 Settings:Protection:Enabled Protections B
- 12.2.3.3 Settings:Protection:DSG FET Protections A
- 12.2.3.4 Settings:Protection:CHG FET Protections A
- 12.2.3.5 Settings:Protection:Both FET Protections B
- 12.2.3.6 Settings:Protection:Body Diode Threshold
- 12.2.3.7 Settings:Protection:Cell Open Wire NORMAL Check Time
- 12.2.3.8 Settings:Protection:Cell Open Wire SLEEP Check Time
- 12.2.3.9 Settings:Protection:Host Watchdog Timeout
- 12.2.1
Settings:Configuration
- 12.3
Protections
- 12.3.1
Protections:Cell Voltage
- 12.3.1.1 Protections:Cell Voltage:Cell Undervoltage Protection Threshold
- 12.3.1.2 Protections:Cell Voltage:Cell Undervoltage Protection Delay
- 12.3.1.3 Protections:Cell Voltage:Cell Undervoltage Protection Recovery Hysteresis
- 12.3.1.4 Protections:Cell Voltage:Cell Overvoltage Protection Threshold
- 12.3.1.5 Protections:Cell Voltage:Cell Overvoltage Protection Delay
- 12.3.1.6 Protections:Cell Voltage:Cell Overvoltage Protection Recovery Hysteresis
- 12.3.2
Protections:Current
- 12.3.2.1 Protections:Current:Overcurrent in Charge Protection Threshold
- 12.3.2.2 Protections:Current:Overcurrent in Charge Protection Delay
- 12.3.2.3 Protections:Current:Overcurrent in Discharge 1 Protection Threshold
- 12.3.2.4 Protections:Current:Overcurrent in Discharge 1 Protection Delay
- 12.3.2.5 Protections:Current:Overcurrent in Discharge 2 Protection Threshold
- 12.3.2.6 Protections:Current:Overcurrent in Discharge 2 Protection Delay
- 12.3.2.7 Protections:Current:Short Circuit in Discharge Protection Threshold
- 12.3.2.8 Protections:Current:Short Circuit in Discharge Protection Delay
- 12.3.2.9 Protections:Current:Latch Limit
- 12.3.2.10 Protections:Current:Recovery Time
- 12.3.3
Protections:Temperature
- 12.3.3.1 Protections:Temperature:Overtemperature in Charge Protection Threshold
- 12.3.3.2 Protections:Temperature:Overtemperature in Charge Protection Delay
- 12.3.3.3 Protections:Temperature:Overtemperature in Charge Protection Recovery
- 12.3.3.4 Protections:Temperature:Undertemperature in Charge Protection Threshold
- 12.3.3.5 Protections:Temperature:Undertemperature in Charge Protection Delay
- 12.3.3.6 Protections:Temperature:Undertemperature in Charge Protection Recovery
- 12.3.3.7 Protections:Temperature:Overtemperature in Discharge Protection Threshold
- 12.3.3.8 Protections:Temperature:Overtemperature in Discharge Protection Delay
- 12.3.3.9 Protections:Temperature:Overtemperature in Discharge Protection Recovery
- 12.3.3.10 Protections:Temperature:Undertemperature in Discharge Protection Threshold
- 12.3.3.11 Protections:Temperature:Undertemperature in Discharge Protection Delay
- 12.3.3.12 Protections:Temperature:Undertemperature in Discharge Protection Recovery
- 12.3.3.13 Protections:Temperature:Internal Overtemperature Protection Threshold
- 12.3.3.14 Protections:Temperature:Internal Overtemperature Protection Delay
- 12.3.3.15 Protections:Temperature:Internal Overtemperature Protection Recovery
- 12.3.1
Protections:Cell Voltage
- 12.4 Power
- 12.5 Security
- 12.6 Data Memory Summary
- 13Revision History
8.1 Overview of Operational Modes
This device supports four operational modes, to support optimized features and power dissipation, with the device able to transition between modes either autonomously or controlled by a host processor.
- NORMAL mode: In this mode, the device performs frequent measurements of system current, cell voltages, internal and thermistor temperature, and various other voltages, operates protections as configured, and provides data and status updates. Battery protections are enabled, and the FET drivers are typically enabled (in the absence of any protection fault).
- SLEEP mode: In this mode, the device performs measurements, calculations, and data updates in adjustable time intervals. Between the measurement intervals, the device is operating in a reduced power state to minimize total average current consumption. Battery protections are still enabled (with modified timing for those using the ADC), and the DSG FET driver (and the CHG FET driver depending on setting) is typically enabled (in the absence of any protection fault).
- DEEPSLEEP mode: In this mode, the FET drivers are disabled, all battery protections are disabled, and no current, voltage, or temperature measurements are taken. The REGOUT LDO can be optionally kept powered, in order to maintain power to external circuitry, such as a host processor. The programmable timer can optionally be used to wake the device and REGOUT LDO after a programmed time interval.
- SHUTDOWN mode: The device is completely disabled (including the internal 1.8 V and REGOUT LDOs), the CHG and DSG FETs are both disabled, all battery protections are disabled, and no measurements are taken. This is the lowest power state of the device, which can be used for shipment or long-term storage. All register settings (other than settings programmed into OTP by TI) are lost when in SHUTDOWN mode.
The device also includes a CONFIG_UPDATE mode, which is used for parameter updates. Transitioning between operational modes is shown in BQ76907 Operational Power Modes.
Figure 8-1 BQ76907 Operational Power Modes