FEATURES
· 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

DESCRIPTION
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.