1 Features

1• Battery Fuel Gauge and Protector for Single-Cell

Li-Ion Applications

• Microcontroller Peripheral Provides:

– Precision 16-Bit, High-Side Coulomb Counter

with Low-Value Sense Resistor

(5 mΩ to 20 mΩ)

– External and Internal Temperature Sensors for

Battery Temperature Reporting

– Lifetime and Current Data Logging

– 64 Bytes of Non-Volatile Scratch Pad Flash

– SHA-1 Authentication Capability

• Battery Fuel Gauging Based on Patented

Impedance Track™ Technology

– Models Battery Discharge Curve for Accurate

Time-To-Empty Predictions

– Automatically Adjusts for Aging, Self-

Discharge, and Temperature- and Rate-

Induced Effects on Battery

• Integrated High-side NMOS Protection FET Drive

• Hardware-based Safety and Protection:

– Overvoltage (OVP)

– Undervoltage (UVP)

– Overcurrent in Charge (OCC)

– Overcurrent in Discharge (OCD)

– Short-Circuit in Discharge (SCD)

• I2C and HDQ Interface Formats for

Communication with Host System

• Ultra-Compact, 15-Ball NanoFree™ DSBGA

2 Applications

• Smartphones

• Tablets

• Handheld Terminals

• MP3 and Multimedia Players

• Portable Gaming

3 Description

The Texas Instruments bq27742-G1 is a fuel gauge

for single-cell Li-Ion battery packs that uses patented

Impedance Track™ technology to deliver rate-,

temperature-, and aging-compensated predictions of

remaining battery capacity and system runtime with

highest accuracy. The device also includes a fully

integrated high-side protector that eliminates the

need for a separate Li-Ion protection circuit and

provides a full suite of high-accuracy fault detections

for overvoltage, undervoltage, overcurrent in charge,

overcurrent in discharge, and short-circuit in

discharge conditions. The hardware protection

functions offer built-in data flash-based

programmability, allowing simple reconfiguration of

existing devices for varying end equipment needs.

The fuel gauge provides information such as

remaining battery capacity (mAh), state-of-charge

(%), runtime to empty (minutes), voltage (mV),

current (mA), and temperature (°C), as well as

recording vital parameters throughout the lifetime of

the battery. The device also supports interrupts to the

host to indicate detection of a variety of important

battery conditions to the system.

The DSBGA is a 15-ball package (2.78 mm ×

1.96 mm) that is ideal for space-constrained

applications.