1 Features

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

Applications up to 14500-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 and

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 bq27545-G1 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 for accurate battery fuel gauging. The

bq27545-G1 resides within the battery pack or on the

system’s main-board with an embedded battery (non

removable).

The bq27545-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

(minimum), battery voltage (mV), and temperature

(°C). It also provides detections for internal short or

tab disconnection events.

The bq27545-G1 also 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 space

constrained applications.