Overview
The Texas Instruments bq27421-G1 fuel gauge, specifically the BQ27421YZFR-G1A model, is a minimally configured microcontroller peripheral designed to provide system-side fuel gauging for single-cell Li-Ion batteries. This device is optimized for use in space-constrained applications and requires very little user configuration and system microcontroller firmware development. It utilizes the patented Impedance Track™ algorithm for accurate fuel gauging and provides detailed information on remaining battery capacity, state-of-charge, and battery voltage.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | DSBGA (YZF) - 9-ball |
| Package Size | 1.62 mm × 1.58 mm, 0.5-mm pitch |
| Operating Temperature Range | -40°C to 85°C |
| Integrated Sense Resistor | 7 mΩ (Typical) |
| I2C Serial Interface Frequency | 400 kHz |
| Battery Type | Single-Cell Li-Ion |
| Power Source | Powered directly from battery with integrated LDO |
Key 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
Applications
- Smartphones, Feature Phones, and Tablets
- Digital Still and Video Cameras
- Handheld Terminals
- MP3 or Multimedia Players
Q & A
- What is the primary function of the BQ27421-G1 fuel gauge?
The primary function is to provide system-side fuel gauging for single-cell Li-Ion batteries.
- What algorithm does the BQ27421-G1 use for fuel gauging?
The device uses the patented Impedance Track™ algorithm.
- What is the package type and size of the BQ27421YZFR-G1A?
The package type is DSBGA (YZF) with a size of 1.62 mm × 1.58 mm and a 0.5-mm pitch.
- What is the operating temperature range of the BQ27421-G1?
The operating temperature range is -40°C to 85°C.
- Does the BQ27421-G1 support both embedded and removable batteries?
- How is the BQ27421-G1 powered?
- What kind of interface does the BQ27421-G1 use for communication?
- Does the BQ27421-G1 adjust for battery aging and other factors?
- What kind of battery health information does the BQ27421-G1 provide?
- What are some common applications of the BQ27421-G1?
