Texas Instruments BQ26501PW

Description
The bq26501 is a highly accurate standalone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting device targeted at space-limited portable applications. It 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 rate of discharge are applied to the charge counter to provide available capacity 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 available capacity, cell temperature and voltage, state-of-charge, and status and control registers. The bq26501 can operate directly from single-cell Li-Ion and Li-Pol batteries and communicates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/s HDQ bus interface reduces communication overhead in the external microcontroller.

Features
Reports Accurate State-of-Charge in Li-Ion and Li-Pol Cells, No System Processor Calculations Needed
Communicates Directly With the Integrated HDQ Engine in TI OMAP™ Processors
Reports Cell Temperature and Voltage
High-Accuracy Coulometric Charge and Discharge Current Integration with Automatic Offset Cancellation
Requires No Offset Calibration
Programmable Input/Output Port
Internal Time-Base Eliminates External Crystal Oscillator
Four Automatic Low-Power Operating Modes
Active: <100 μA
Sleep: <2.5 μA
Ship: < 1.7 μA
Hibernate: < 1.5 μA
Small 8-Pin TSSOP Package

Applications
PDAs
Smart Phones
MP3 Players
Digital Cameras
Internet Appliances
Handheld Devices