1 Features

1? Single-Cell Li-Ion Battery Fuel Gauge

– Resides on System Board

– Supports Embedded or Removable Batteries

– Powered Directly from Battery with Integrated

LDO

? Easy To Configure Fuel Gauging Based on the

Dynamic Voltage Correlation Algorithm

– Reports Remaining Capacity and State of

Charge (SOC) with Smoothing Filter

– Automatically Adjusts for Self-Discharge,

Temperature, and Rate Changes

? Microcontroller Peripheral Supports:

– 400-kHz I2C Serial Interface

– Configurable SOC Interrupt or

Battery Low Digital Output Warning

– Internal Temperature Sensor or

Host Reported Temperature

? Support 4.2-V, 4.3-V, and 4.35-V Chemistries

? 9-pin 1.62 × 1.58 mm, 0.5 mm pitch YZF package

2 Applications

? Smartphones, Feature Phones, and Tablets

? Digital Still and Video Cameras

? Handheld Terminals

? MP3 or Multimedia Players

3 Description

The Texas Instruments bq27621-G1 is a minimally

configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion

batteries. The device requires very little user

configuration and system microcontroller firmware

development.

The bq27621-G1 uses the Dynamic Voltage

Correlation algorithm for fuel gauging. This process

eliminates the need for a sense resistor when

calculating remaining battery capacity (mAh), state- of-charge (%), battery voltage (mV), and temperature

(°C).

Battery fuel gauging with the bq27621-G1 requires

connections only to PACK+ (P+) and PACK– (P–) for

a removable battery pack or embedded battery

circuit. The tiny 9-pin, 1.62 mm × 1.58 mm, 0.5 mm

pitch YZF package is ideal for space-constrained applications.