BQ27421-G1 System-Side(tm) Fuel Gauge With Integrated Sense Resistor | Battery Gas Gauge | TI.com

BQ27421-G1 (ACTIVE)

System-Side(tm) Fuel Gauge With Integrated Sense Resistor | Battery Gas Gauge

System-Side(tm) Fuel Gauge With Integrated Sense Resistor | Battery Gas Gauge - BQ27421-G1
Datasheet
bq27421-G1 System-Side Impedance Track Fuel Gauge With Integrated Sense Resistor datasheet (Rev. E)
 

Description

The Texas Instruments bq27421-G1 fuel gauge 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 bq27421-G1 fuel gauge uses the patented Impedance TrackTM algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the bq27421-G1 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-ball, 1.62 mm × 1.58 mm, 0.5-mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.

Features

  • Single-Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly from Battery with Integrated
      LDO
    • Low-Value Integrated Sense Resistor
      (7 mΩ, Typical)
  • Easy-to-Configure Fuel Gauging Based on
    Patented Impedance Track™ Technology
    • Reports Remaining Capacity and State-of-
      Charge (SOC) with Smoothing Filter
    • Automatically Adjusts for Battery Aging, Self-
      Discharge, Temperature, and Rate Changes
    • Battery State-of-Health (Aging) Estimation
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host-Reported Temperature

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Parametrics Compare all products in Battery fuel gauges

 
Number of series cells
Cell chemistry
Battery capacity (Max) (mAh)
Communication interface
Battery capacity (Min) (mAh)
External capacity indication
Implementation
Gas gauge algorithm
Cell balancing
Features
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
BQ27421-G1 BQ27425-G2A BQ27425-G2B
Single Cell     Single Cell     Single Cell    
Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer    
8000     4000     4000    
I2C     I2C     I2C    
100     100     100    
None     None     None    
System     System     System    
Impedance Track     Impedance Track     Impedance Track    
   
   
   
Integrated Sense Resistor    
   
   
-40 to 85     -40 to 85     -40 to 85    
DSBGA | 9     DSBGA | 15     DSBGA | 15    
See datasheet (DSBGA)     See datasheet (DSBGA)     See datasheet (DSBGA)