bq2060A

Features:

Provides accurate measurement of available charge in NiCd,NiMH, Li-Ion, and lead-acid batteries
Supports SBS Smart Battery DataSpecificationv1.1
Supports the 2-wire SMBus v1.1 interface with PEC or 1-wire HDQ16
Reportsindividualcellvoltages
Monitors and provides control to charge and discharge FETs in Li-Ionprotectioncircuit
Provides 15-bit resolution for voltage, temperature, and currentmeasurements
Measures charge flow using a V-to-F converter with offset of lessthan16Vaftercalibration
Consumes less than 0.5mW operating
Drives a 4- or 5-segment LED display for remaining capacity indication
28-pin150-milSSOP


Pinout




Specifications

Symbol	Parameter	Minimum	Maximum	Unit	Notes
VCC-Supply voltage	Relative to VSS	-0.3	+6.0	V
VINAll other pins	Relative to VSS	-0.3	+6.0	V
TOPR	Operating temperature	-20	+70	°C	Commercial

Description

The bq2060A SBS-Compliant Gas Gauge IC for battery pack or in-system installation maintains an accurate record of available charge in rechargeable batteries. The bq2060A monitors capacity and other critical battery parameters for NiCd, NiMH, Li-Ion, and lead-acid chemistries.The bq2060A uses a -to-F converter with automatic offset error correction for charge and discharge counting. For voltage, temperature, and current reporting, the bq2060A uses an A-to-D converter. The onboard ADC also monitors individual cell voltages in a Li-Ion battery pack and allows it to generate control signals that may be used in conjunction with a pack supervisor to enhance packsafety.


The bq2060A supports the smart battery data (SBData) commands and charge-control functions. It communicates data using the system manage-ment bus (SMBus) 2-wire protocol or the Benchmarq 1-wire HDQ16 protocol. The data available include the battery's remaining capacity, temper-ature, voltage, current, and remaining run-time predictions. Thebq2060A provides LED drivers and a push-button input to depict remaining battery capacity from full to empty in 20% or 25% increments witha4or 5-segmentdisplay.


The bq2060A works with an external EEPROM. The EEPROM stores the configuration information for the bq2060A, such as the battery's chemistry, self-discharge rate, rate compensation factors, measurement calibration, and design voltage and capacity. The bq2060A uses the programmable self-discharge rate and other compensation factors stored in the EEPROM to accurately adjust remaining capacity for use and standby conditions based on time, rate, and temperature. The bq2060A also auto-matically calibrates or learns the true battery capacity in the course of a discharge cycle from near-full to near-emptylevels.


The REG output regulates the operating voltage for the bq2060A from the battery cell stack using an external JFET.