1 Features

1? Battery Fuel Gauge for 1-Series (1sXp) Li-Ion

Applications up to 14,500-mAh Capacity

? Microcontroller Peripheral Provides:

– Internal or External Temperature Sensor for

Battery Temperature Reporting

– SHA-1/HMAC Authentication

– Lifetime Data Logging

– 64 Bytes of Non-Volatile Scratch Pad FLASH

? Battery Fuel Gauging Based on Patented

Impedance Track? Technology

– Models 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 (5 mΩ to 20 mΩ)

? Advanced Fuel Gauging Features

– Internal Short Detection

– Tab Disconnection Detection

? HDQ and I2C? Interface Formats for

Communication with Host System

? Small 15-Ball Nano-Free? (DSBGA) Packaging

2 Applications

? Smartphones

? Tablets

? Digital Still and Video Cameras

? Handheld Terminals

? MP3 or Multimedia Players

3 Description

The bq27546-G1 Li-Ion battery fuel gauge is a

microcontroller peripheral that provides fuel gauging

for single-cell Li-Ion battery packs. The device

requires minimal system microcontroller firmware

development for accurate battery fuel gauging. The

bq27546-G1 resides within the battery pack or on the

system’s main-board with an embedded battery (nonremovable).

The bq27546-G1 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). It also

provides detections for internal short or tab

disconnection events.

The bq27546-G1 features integrated support for

secure battery pack authentication, using the SHA-

1/HMAC authentication algorithm.

The device comes in a 15-ball Nano-Free? DSBGA

package (2.61 mm × 1.96 mm) that is ideal for spaceconstrained

applications.