BQ26501 Datasheet | Texas Instruments

FEATURES D Reports Accurate State-of-Charge in Li-Ion and Li-Pol Cells, No System Processor Calculations Needed D municates Directly With the Integrated HDQ Engine in TI OMAPt Processors D Reports Cell Temperature and Voltage D High-Accuracy Coulometric Charge and Discharge Current Integration with Automatic Offset Cancellation D Requires No Offset Calibration D Programmable Input/Output Port D Internal Time-Base Eliminates External Crystal Oscillator D Four Automatic Low-Power Operating Modes - Active: < 100 µA - Sleep: < 2.5 µA - Ship: < 1.7 µA - Hibernate: < 1.5 µA D Small 8-Pin TSSOP Package SIMPLIFIED APPLICATION PACK+ HDQ bq26501 1 RBI GPIO 8 2 VCC SRP 7 3 VSS SRN 6 4 HDQ BAT 5 Li-Ion or + Li-Pol APPLICATIONS D PDAs D Smart Phones D MP3 Players D Digital Cameras D Internet Appliances D Handheld Devices DESCRIPTION The bq26501, the first in the bq JUNIORt family of advanced gas gauge device for handhald applications, is a highly accurate standalone single-cell Li-Ion and Li-Pol battery capacity monitoring and reporting device targeted at space limited portable applications. The device 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. pensations 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 municates to the system over a simple one-wire bi-directional serial interface. The 5-kbits/s HDQ bus interface reduces munication overhead in the external microcontroller. PACK- Protection Controller Battery Pack UDG-...