Gas Gauge Li-Ion/Li-Pol 20-Pin TSSOP Tube

The bq20z40 SBS-compliant gas gauge and protection IC,incorporating patented Impedance Track technology, is designed forbattery-pack or in-system installation. The bq20z40 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z40monitors 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 maximizes functionality andsafety while minimizing external component count and cost in smart battery circuits. The Impedance Track technology continuously analyzes the battery impedance, resulting in superiorgas-gauging accuracy. This enables the remaining capacity to be calculated with discharge rate, temperature, and cell aging that are all accounted for during each stage of every cycle.

Next Generation Patented Impedance Track Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries

• Better Than 1% Error Over the Lifetime of the Battery

Supports the Smart Battery Specification SBS V1.1

Flexible Configuration for 2 to 4 Series Li-Ion and Li-Polymer Cells

Powerful 8-Bit RISC CPU With Ultralow Power Modes

Full Array of Programmable Protection Features

• Voltage, Current, and Temperature

Satisfies JEITA Guidelines

Added Flexibility to Handle More Complex Charging Profiles

Lifetime Data Logging

Supports SHA-1 Authentication

Available in a 20-Pin TSSOP (PW) package

APPLICATIONS

• Notebook PCs
• Medical and Test Equipment
• Portable Instrumentation