DS2786G+T

Product Summary

The DS2786G+T is a Standalone OCV-Based Fuel Gauge. The DS2786G+T estimates available capacity for rechargeable Li-Ion and Li-Ion Polymer batteries based on the cell voltage in the open-circuit state following a relaxation period. The open-circuit voltage (OCV) is used to determine relative cell capacity based on a lookup table stored in the IC. This capability makes accurate capacity information available immediately after a battery pack is inserted. During periods of moderate to high rate discharging, which preclude OCV measurements, the DS2786G+T uses coulomb counting as a secondary means of estimating relative capacity. The applications of the DS2786G+T are 3G Multimedia Wireless Handsets, Digital Still Cameras and Digital Audio (MP3) Players.

Parametrics

DS2786G+T absolute maximum ratings: (1)Voltage on All Pins Except VPROG Relative to VSS: -0.3V to +6V; (2)Voltage on VPROG Relative to VSS: -0.3V to +18V; (3)Operating Temperature Range: -40 to +85℃; (4)Storage Temperature Range: -55 to +125℃; (5)Soldering Temperature: See IPC/JEDECJ-STD-020A.

Features

DS2786G+T features: (1)Relative Capacity Calculated from Combination Coulomb Counter and Open-Circuit Cell Voltage (OCV) Battery Model ; (2)Accurate Warning of Low Battery Conditions Even On First Cycle (No Learn Cycle Needed); (3)12-Bit Battery Voltage Measurement: ±10mV Accuracy 1.22mV LSB, 0V to 5V Input Range; (4)11-Bit Bidirectional Current Measurement: 25μV LSB, ±51.2mV Dynamic Range 1.67mA LSB, ±3.4A (RSNS = 15mΩ); (5)Current Accumulation Measurement Resolution: ±204.8mVh Range ±13.65Ah (RSNS = 15mΩ); (6)Internal Temperature Measurement: 0.125℃ LSB, ±3℃ Accuracy; (7)Two 11-Bit Aux Input Voltage Measurements: ±8 LSB Accuracy, Ratiometric Inputs Eliminate Supply Accuracy Issues; (8)VOUT Pin Drives Resistive Dividers, Reduces Current Consumption; (9)2-Wire Interface; (10)Low Power Consumption: Active Current: 50μA typ, 80μA max; Sleep Current: 1μA typ, 3μA max.

Diagrams