Features: · Five 30mA Open-Drain Drivers for Driving LED Fuel-Gauge Display
· Debounced Fuel-Gauge Display Enable
· Internal Voltage Measurement Gain Register for Trimming External Voltage-Divider
· Pin for Driving FETs to Enable Voltage-Divider Only During Voltage Measurement, Conserving Power
· Precision Voltage, Temperature, and Current Measurement System
· Accurate, Temperature-Stable, Internal Time Base
· Absolute and Relative Capacity Estimated from Coulomb Count, Discharge Rate, Temperature,and Battery Cell Characteristics
· Accurate Warning of Low Battery Conditions
· Automatic Backup of Coulomb Count and Age Estimation to Nonvolatile (NV) EEPROM
· Gain and Tempco Calibration Allows the Use of Low-Cost Sense Resistors
· 24-Byte Battery/Application Parameter EEPROM
· 16-Byte User EEPROM
· Unique ID and Multidrop 1-Wire® Interface
· 14-Pin TSSOP Package
ApplicationPower Tools
Electric Bicycles
Electric Vehicles
Uninterruptible Power Supply
Digital CamerasPinout
SpecificationsVoltage Range on Any Pin Relative to VSS..............-0.3V to +6.0V
Voltage Range on VIN, VMA Relative to VSS ...-0.3V to VDD + 0.3V
DVSS to VSS...........................................................-0.3V to +0.3V
LED15................................................................60mA each pin
Operating Temperature Range ........................-40°C to +85°C
Storage Temperature Range .........................-55°C to +125°C
Soldering Temperature (10s) .......Refer to IPC/JEDEC-020 Specification.DescriptionThe DS2788 measures voltage, temperature, and current,and estimates available capacity for rechargeable lithium-ion (Li+) and Li+ polymer batteries. Cell characteristics and application parameters used in the calculations are stored in on-chip EEPROM. The DS2788 available capacity registers report a conservative estimate of the amount of charge that can be removed given the current temperature, discharge rate, stored charge, and application parameters. Capacity estimation is reported in mAh remaining and percentage of full.
DS2788 LED display drivers and a debounced input make display of the capacity information easy. The LED pins can directly sink current, requiring only a resistor for setting the current in the LED display, thus reducing space and cost.
DS2788 Data Sheet
