BQ2085-V1P3
- 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 batterys 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.
Similar products you might be interested in
Same functionality with different pin-out to the compared device
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | bq2085-V1P3: SBS-Compliant Gas Gauge IC For Use With The bq29311 datasheet | 23 Feb 2004 | |
Application note | Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) | PDF | HTML | 12 Jul 2019 | |
Application note | Thermistor Coefficient Calculator for TI Advanced Fuel Gauges | 04 Oct 2006 | ||
Application note | bq2083, bq2084, and bq2085 Calibration Procedure (Rev. A) | 15 Sep 2004 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
TSSOP (DBT) | 38 | Ultra Librarian |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
- Fab location
- Assembly location
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.