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 A
− Sleep: < 2.5 A
− Ship: < 1.7 A
− Hibernate: < 1.5 A
` Small 8-Pin TSSOP Package
Application· PDAs
· Smart Phones
· MP3 Players
· Digital Cameras
· Internet Appliances
· Handheld DevicesPinout
Specifications
| |
|
|
UNIT |
| Supply voltage range, VCC (all with respect to VSS) |
0.3 V to 7 V |
V |
| Input voltage range at SRP, SRN, RBI, and BAT (all with respect to VSS) |
−0.3 to VCC + 0.3 V |
V |
| Input voltage |
HDQ, GPIO (with respect to VSS) |
−0.3 to 7.0 |
V |
| GPIO (with respect to VSS) during EEPROM programming only |
−0.3 to 22.0 |
V |
| Output sink current at GPIO, HDQ |
5 |
mA |
| Operating free-air temperature range, TA |
−20 to 70 |
|
| Storage temperature range, Tstg |
65 to 150 |
|
| Junction temperature range, TJ |
−40 to 125 |
|
| Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds |
300 |
|
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to Absolute Maximum Rated conditions for extended periods may affect device reliability
DescriptionThe bq26501, the first in the bqJUNIOR 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 BQ26501 monitors a voltage drop across a small current sense resistor of BQ26501 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 of BQ26501 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.
BQ26501 Data Sheet
