Features: ` Provides Accurate Measurement of Available Charge in Li-Ion and Li-Polymer Batteries
` Supports the Smart Battery Specification (SBS) V1.1
` Integrated Time Base Removes Need for External Crystal with Optional Crystal input
` Works With the TI bq29312 Analog Front-End (AFE) Protection IC to Provide Complete PackElectronics for 7.2-V, 10.8-V or 14.4-V Battery Packs With Few External Components
` Based on a Powerful Low-Power RISC CPU Core With High-Performance Peripherals
` Integrated Flash Memory Eliminates the Need for External Configuration EEPROM
` Uses 16-Bit Delta Sigma Converter for Accurate Voltage and Temperature Measurements
` Measures Charge Flow Using a High Resolution 16-Bit Integrating Converter
Better Than 0.65-nVh of Resolution
Self-Calibrating
Offset Error Less Than 1-V
` Programmable Cell Modeling for Maximum Battery Fuel Gauge Accuracy
` Drives 3-, 4-, or 5-Segment LED Display for Remaining Capacity Indication
` Available in a 38-Pin TSSOP (DBT) Package
Application· Notebook PCs
· Medical and Test Equipment
· Portable InstrumentationSpecifications
| Supply voltage range,VDD relative to VSS(2) |
−0.3 V to 6 V |
| Open-drain I/O pins,V(IOD) relative to VSS (2) |
−0.3 V to 6 V |
| Input voltage range to all other pins,VI relative to VSS(2) |
−0.3 V to VDD + 0.3V |
| Operating free-air temperature range,TA |
−20°C to 85°C |
| Storage temperature range,Tstg |
−65°C to 150°C |
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) VSS refers to the common node of V(SSA), V(SSD), and V(SSP).
DescriptionThe bq2084-V140 SBS-compliant gas gauge IC for battery pack or in-system installation maintains an accurate record of available charge in Li-ion or Li-polymer batteries. The bq2084-V140 monitors capacity and other critical parameters of the battery pack and reports the information to the system host controller over a serial communication bus. It is designed to work with the bq29312 AFE protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits.Using information from the bq2084-V140, the host controller can manage remaining battery power to extend the system run time as much as possible.
The bq2084-V140 uses an integrating converter with lomb counting in portable applications, the self-calibrating integrating converter has a resolution better than 0.65-nVh and an offset measurement error of less than 1-V (typical). For voltage and temperature reporting, the bq2084-V140 uses a 16-bit A-to-D converter. With the bq29312, the onboard ADC also monitors the pack and individual cell voltages in a battery pack and allows the bq2084-V140 to generate the control signals necessary to implement the cell balancing and the required safety protection for Li-ion and Li-polymer battery chemistries.
The bq2084-V140 supports the Smart Battery Data (SBData) commands and charge-control functions. It communicates data using the System Management Bus (SMBus) 2-wire protocol. The data available include the battery's remaining capacity, temperature,voltage, current, and remaining run-time predictions.
The bq2084-V140 provides LED drivers and a pushbutton input to depict remaining battery capacity from full to empty in 20%, 25%, or 33% increments with a 3-, 4-, or 5-segment display.
bq2084-V140 Data Sheet
