BQ27621-G1 System-Side Fuel Gauge with Dynamic Voltage Correlation, Battery Gas Gauge | TI.com

BQ27621-G1 (ACTIVE)

System-Side Fuel Gauge with Dynamic Voltage Correlation, Battery Gas Gauge

System-Side Fuel Gauge with Dynamic Voltage Correlation, Battery Gas Gauge - BQ27621-G1
 

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.

Features

  • 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

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Parametrics Compare all products in Battery Fuel Gauge

 
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)
Pin/Package
BQ27621-G1 BQ27220 BQ27426 BQ27520-G4 BQ27542-G1 BQ35100
Single Cell     Single Cell     Single Cell     Single Cell     Single Cell     2-4 Cells
>4 Cells
Single Cell    
Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Primary Lithium    
32000     29000     14000     32000     32000     32000    
I2C     I2C     I2C     I2C     HDQ
I2C    
I2C    
100     100     100     100     100     100    
None     None     None     None     None     None    
System     Pack
System    
System     System     Pack     Pack
System    
Dynamic Voltage Correlation     CEDV     Impedance Track     Impedance Track     Impedance Track     Primary    
N/A     N/A     N/A     N/A     N/A     N/A    
No Sense Resistor Required     N/A     N/A     N/A     SHA-1 Authentication     End of Service    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
9DSBGA     9DSBGA     9DSBGA     15DSBGA     12SON     14TSSOP