bq29312

` Uses ImpedanceTrack Technology to Provide Accurate Measurement of Available Charge in Li-Ion and Li-Polymer Batteries
` Better than 1% Error Over Lifetime of the Battery
` Instant Accuracy ¨ No Learning Cycle Required
` Supports the Smart Battery Specification SBS V1.1
` Works With the TI bq29312 Analog Front End (AFE) Protection IC to Provide Complete Pack Electronics Solution
` Full Array of Programmable Voltage, Current, and Temperature Protection Features
` Integrated Time Base Removes Need for External Crystal with Optional Crystal Input
` Electronics 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 Field Programmable FLASH Memory Eliminates the Need for External Configuration
`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
` Uses 16-Bit Delta Sigma Converter for Accurate Voltage and Temperature Measurements
` Extensive Data Reporting Options For Improved System Interaction

The bq20z80 SBS-compliant gas gauge IC incorpor- ating ImpedanceTrack technology is designed for battery pack or in-system installation. The bq20z80 measures and maintains an accurate record of avail- able charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z80 monitors capacity change, battery im- pedance, open circuit voltage, 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 analog front-end (AFE) protection IC to maximize functionality and safety and minimize component count and cost in smart battery circuits. The superior ImpedanceTrack technology gas- gaug- ing accuracy is created by the continuous analysis of the impedance of the battery. This enables remaining capacity to be calculated with discharge rate, tem- perature, and cell aging all accounted for during each stage of every cycle.