| Cell chemistry | Li-Ion/Li-Polymer |
| Number of series cells | 2-4 Cells |
| Communication interface | SMBus |
| Battery capacity (Min) (mAh) | 500 |
| Battery capacity (Max) (mAh) | 15000 |
| Implementation | Pack |
| External capacity indication | LED |
| Features | Coulomb Counter |
| Operating temperature range (C) | -20 to 85 |
| Cell balancing | Internal |
| | |
- 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
- Works With the TI bq29311 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics for 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
- Measures Charge Flow Using a High Resolution 16-Bit Integrating Converter
- Better Than 3-nVh of Resolution
- Self-Calibrating
- Offset Error Less Than 1 μV
- Uses 16-Bit Delta Sigma Converter for Accurate Voltage and Temperature Measurements
- Programmable Cell Modeling for Maximum Battery Fuel Gauge Accuracy
- Drives 3-, 4-, or 5-Segment LED Display for Remaining Capacity Indication
- 38-Pin TSSOP (DBT)
- APPLICATIONS
- Notebook PCs
- Medical and Test Equipment
- Portable Instrumentation
The bq2085-V1P3 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 bq2085-V1P3 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 bq29311 analog front-end (AFE) protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits. Using information from the bq2085-V1P3, the host controller can manage remaining battery power to extend the system run time as much as possible.
The bq2085-V1P3 uses an integrating converter with continuous sampling for the measurement of battery charge and discharge currents. Optimized for coulomb counting in portable applications, the self-calibrating integrating converter has a resolution better than 3-nVh and an offset measurement error of less than 1-μV (typical). For voltage and temperature reporting, the bq2085-V1P3 uses a 16-bit A-to-D converter. In conjunction with the bq29311, the onboard ADC also monitors individual cell voltages in a battery pack and allows the bq2085-V1P3 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 bq2085-V1P3 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 bq2085-V1P3 provides LED drivers and a push-button input to depict remaining battery capacity from full to empty in 20%, 25%, or 33% increments with a 3-, 4-, or 5-segment display.
The bq2085-V1P3 contains 512 bytes of internal data flash memory, which store configuration information. The information includes nominal capacity and voltage, self-discharge rate, rate compensation factors, and other programmable cell-modeling factors used to accurately adjust remaining capacity for use-conditions based on time, rate, and temperature. The bq2085-V1P3 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from programmable near full to near empty levels.
The bq29311 AFE protection IC provides power to the bq2085-V1P3 from a 3 or 4 series Li-ion cell stack, eliminating the need for an external regulator circuit.
