Gas Gauge Li-Ion/Li-Pol 0.4V 38-Pin TSSOP Tube

The bq20z80 SBS-compliant gas gauge IC, incorporating patented Impedance Track technology, is designed for battery-pack or in-system installation. The bq20z80 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z80 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 bq29312A 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 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.

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

Works With the TI bq29312A 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 Memory

Measures Charge Flow Using a High-Resolution, 16-Bit Integrating Delta-Sigma Converter

• Better Than 0.65 nVh of Resolution
• Self-Calibrating
• Offset Error Less Than 1 µV

Uses 16-Bit Delta-Sigma Converter for Accurate Voltage and Temperature Measurements

Extensive Data Reporting Options For Improved System Interaction

Optional Pulse Charging Feature for Improved Charge Times

Drives 3-, 4- or 5-Segment LED Display for Remaining Capacity Indication

Supports SHA-1 Authentication

Lifetime Data Logging

38-Pin TSSOP (DBT)

APPLICATIONS

• Notebook PCs
• Medical and Test Equipment
• Portable Instrumentation