FEATURES

Battery Fuel Gauge for 1-Series Li-Ion

Applications

Resides on System Main Board

– Works With Embedded or Removable Battery Packs

Uses PACK+, PACK–, and T Battery Terminals

Microcontroller Peripheral Provides:

– Accurate Battery Fuel Gauging

– Internal Temperature Sensor for Battery

Temperature Reporting

– Battery Low Interrupt Warning

– Battery Insertion Indicator

– Configurable Level of State of Charge

(SOC) Interrupts

– State of Health Indicator

– 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 mW or Less)

400-kHz I2C? Interface for Connection to

System Microcontroller Port

In a 12-Pin NanoFree? (CSP) Packaging

APPLICATIONS

Smartphones

PDAs

Digital Still and Video Cameras

Handheld Terminals

MP3 or Multimedia Players

1.3 DESCRIPTION

The Texas Instruments bq27505 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 bq27505

resides on the system’s main board and manages an

embedded battery (non-removable) or a removable

battery pack.

The bq27505 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), temperature (°C) and state of health

(%).

Battery fuel gauging with the bq27505 requires only

PACK+ (P+), PACK– (P–), and Thermistor (T)

connections to a removable battery pack or

embedded battery circuit. The CSP option is a 12-ball

package in the dimensions of 2,43 mm ′ 1,96 mm

with 0,5 mm lead pitch. It is ideal for space

constrained applications.