bq27220 Overview
The Texas Instruments bq27220 battery fuel gauge is a single-cell gauge that requires minimal userconfiguration and system microcontroller firmware development, leading to quick system bring-up. The bq27220 device uses the pensated End-ofDischarge Voltage (CEDV) algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime-to-empty (min), battery voltage (mV), temperature (°C), and state-of-health (%). The bq27220 battery fuel gauge has ultra-low power consumption in NORMAL (50 μA) and SLEEP (9 μA) modes, leading to longer battery runtime. Configurable interrupts help save system power and free up the host from continuous polling. Accurate temperature sensing is supported via an external thermistor. Battery fuel gauging with the bq27220 device requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack...
bq27220 Key Features
- 1 Single-Cell Li-Ion Battery Fuel Gauge
- Resides in Pack or on System Board
- Supports Embedded or Removable Batteries
- Powers Directly from Battery with Integrated LDO
- Supports a Low-Value (10-mΩ) External Sense Resistor
- Ultra-Low Power Consumption in NORMAL (50 µA) and SLEEP (9 µA) Modes
- Battery Fuel Gauging Based on pensated End-of-Discharge Voltage (CEDV) Technology
- Reports Remaining Capacity and State-ofCharge (SOC) with Smoothing Filter
- Adjusts Automatically for Battery Aging, SelfDischarge, Temperature, and Rate Changes
- Provides Battery State-of-Health (Aging) Estimation