bq20z70

` Next Generation Patented Impedance Track™ Technology accurately Measures
    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
` Powerful 8-Bit RISC CPU With Ultra-Low Power Modes
` Works With the TI bq29330 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics Solution
` Full Array of Programmable Protection Features
    Voltage, Current and Temperature
` Fully Integrated High Accurate Clock
` Flexible Configuration for 2 to 4 Series Li-Ion and Li-Polymer Cells
` Integrated Field Programmable FLASH Memory Eliminates the Need for External Configuration Memory
` Smart Battery Charger Control Feature
` Two 16-Bit Delta-Sigma Converter
Accurate Voltage and Temperature Measurements
Integrating Coloumb Counter for Charge  Flow
    ` Better Than 0.65 nVh of Resolution
    ` Self-Calibrating
` Supports SHA-1 Authentication
` 20-Pin TSSOP (PW)

The bq20z70 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z70 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z70 monitors capacity change, battery impedance 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 bq29330 analog front-end (AFE) protection IC to maximize functionality and safety, and minimize component count and cost in smart battery circuits.

The Impedance Track technology of bq20z70 continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle.