The Texas Instruments bq27500/01 system-side Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development. The bq27500/01 resides on the system main board, and manages an embedded battery (non-removable) or a removable battery pack.
The bq27500/01 uses the patented Impedance Track algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).
Battery fuel gauging with the bq27500 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery. The bq27501 works with identification resistors in battery packs to gauge batteries of different fundamental chemistries and/or significantly different rated capacities.
Feature
Battery Fuel Gauge for 1-Series Li-Ion Applications
Resides on System Main Board
Two Varieties
bq27500: Uses PACK+, PACK–, and T Battery Terminals
bq27501: Works With Battery ID Resistor in Battery Pack
Microcontroller Peripheral Provides:
Accurate Battery Fuel Gauging
Internal Temperature Sensor for System Temperature Reporting
Battery Low Interrupt Warning
Battery Insertion Indicator
Battery ID Detection
96 Bytes of Non-Volatile Scratch-Pad FLASH
Battery Fuel Gauge Based on Patented Impedance Track Technology
Models the Battery Discharge Curve for Accurate Time-to-Empty Predictions
Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature/Rate Inefficiencies
Low-Value Sense Resistor (10 m or Less)
I2C Interface for Connection to System Microcontroller Port
12-Pin 2,5-mm × 4-mm SON Package
APPLICATIONS
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
