BQ27000

单节锂电池和锂聚合物电池电量监测计 IC

The bqJUNIOR™ series are highly accurate stand-alone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting devices targeted at space-limited, portable applications. The IC monitors a voltage drop across a small current sense resistor connected in series with the battery to determine charge and discharge activity of the battery. Compensations for battery temperature, self-discharge, and discharge rate are applied to the capacity measurments to provide available time-to-empty information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or learned, in the course of a discharge cycle from full to empty. Internal registers include current, capacity, time-to-empty, state-of-charge, cell temperature and voltage, status, and more.

The bqJUNIOR can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a HDQ one-wire or I2C serial interface.

.

HDQ bq27000 or I2C bq27200 Communication

.

Reports Accurate _Time-to-Empty_ With Measured Load and Historical Maximum and Standby Loads

.

Reports Temperature, Voltage, and Current

.

High Accuracy Charge and Discharge Current Integration with Automatic Offset Calibration

.

Requires No User Calibration

.

Programmable Input/Output Port

.

Internal User EEPROM Configuration Memory

.

Automatic Capacity Reduction With Age

.

Stable Oscillator Without External Components

.

Dynamic End-of-Discharge Detection Delay to Allow Use in a High-Dynamic Load Environment

.

Automatic Sleep Mode When Communication Lines are Low

.

Available in a Small 3 mm x 4 mm QFN Package

.

Five Low-Power Operating Modes

.

Active: < 90 µA

.

Sleep: < 2.5 µA

.

Ship: < 2 µA bq27000 only

.

Hibernate: < 1.5 µA

.

Data Retention: < 20 nA

.

APPLICA ONS

.

PDA

.

Smart Phones

.

MP3 Players

.

Digital Cameras

.

Internet Appliances

.

Handheld Devices

bqJUNIOR is a trademark of Texas Instruments.