DS2788

DS2788 19-4639; Rev 2; 5/09 Stand-Alone Fuel-Gauge IC with LED Display Drivers General Description The 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 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. 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. Applications Power Tools Electric Bicycles Electric Vehicles Uninterruptible Power Supply Digital Cameras TOP VIEW LED2 LED1 DVSS VDD OVD VSS DQ 1 2 3 4 5 6 7 + Pin Configuration DS2788 TSSOP 14 LED3 13 LED4 12 LED5 11 PIO 10 VIN 9 SNS 8 VMA 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, Int...