188宝金博页面版

??????? ?SLUS586B − OCTOBER 2003 − REVISED MARCH 2004??????????? ?????? ??? ?????? ??????? ??? ????? ?? ??? ???????? ???????????? ?????????? ???????1www.ti.comFEATURES?Reports Accurate State-of-Charge in Li-Ionand Li-Pol Cells, No System ProcessorCalculations NeededCommunicates Directly With the IntegratedHDQ Engine in TI OMAP? ProcessorsReports Cell Temperature and VoltageHigh-Accuracy Coulometric Charge andDischarge Current Integration withAutomatic Offset CancellationRequires No Offset CalibrationProgrammable Input/Output PortInternal Time-Base Eliminates ExternalCrystal OscillatorFour Automatic Low-Power Operating Modes− Active: < 100 µA− Sleep: < 2.5 µA− Ship: < 1.7 µA− Hibernate: < 1.5 µASmall 8-Pin TSSOP Package???????? APPLICATIONS?PDAsSmart PhonesMP3 PlayersDigital CamerasInternet AppliancesHandheld Devices?????DESCRIPTIONThe bq26501, the first in the bqJUNIOR? familyof advanced gas gauge device for handhaldapplications, is a highly accurate standalonesingle-cell Li-Ion and Li-Pol battery capacitymonitoring and reporting device targeted at spacelimited portable applications. The device monitorsa voltage drop across a small current senseresistor connected in series with the battery todetermine charge and discharge activity of thebattery. Compensations for battery temperature,self-discharge, and rate of discharge are appliedto the charge counter to provide available capacityacross a wide range of operating conditions.Battery capacity is automatically recalibrated, orlearned, in the course of a discharge cycle from fullto empty. Internal registers include availablecapacity, cell temperature state-of-charge, and status and control registers.and voltage,The bq26501 can operate directly from single-cellLi-Ion and Li-Pol batteries and communicates tothe system over a simple one-wire bi-directionalserial interface. The 5-kbits/s HDQ bus interfacereduces communication overhead in the externalmicrocontroller.?????????? ???? ??????????? ?? ??????? ?? ?? ??????????? ????????????? ??????? ?? ?????????????? ??? ??? ????? ?? ????? ??????????????????? ????????? ?????????? ?????????? ???? ??? ??????????? ?????????????? ?? ??? ???????????Copyright ? 2003−2004, Texas Instruments IncorporatedPlease be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.UDG−03038SIMPLIFIED APPLICATION12348765GPIOSRPSRNBATRBIVCCVSSHDQbq26501ProtectionController+HDQPACK−PACK+Battery PackLi-IonorLi-Pol