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DS2786G+ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS2786G+ Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 21 page  1 of 21 050907 GENERAL DESCRIPTION The DS2786 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 DS2786 uses coulomb counting as a secondary means of estimating relative capacity. Remaining capacity is reported in percent, along with cell voltage, current and temperature information. Cell characteristics and application parameters used in the calculations are stored in on-chip EEPROM. The DS2786 is intended for use on the host side of portable devices, though it can also be mounted within a battery pack. Measurement and estimated capacity data are accessed through an I 2C interface. Temperature data is available from an on-die sensor. Resistance measurements of a pack identification resistor and pack thermistor are supported by ratiometric measurements on two auxiliary inputs. APPLICATIONS 3G Multimedia Wireless Handsets Digital Still Cameras Digital Audio (MP3) Players TYPICAL OPERATING CIRCUIT FEATURES Relative Capacity Calculated from Combination Coulomb Counter and Open- Circuit Cell Voltage (OCV) Battery Model Accurate Warning of Low Battery Conditions Even On First Cycle (No Learn Cycle Needed) 12-Bit Battery Voltage Measurement: ±10mV Accuracy 1.22mV LSB, 0V to 5V Input Range 11-Bit Bidirectional Current Measurement: 25 μV LSB, ±51.2mV Dynamic Range 1.67mA LSB, ±3.4A (RSNS = 15mΩ) Current Accumulation Measurement Resolution: ±204.8mVh Range ±13.65Ah (RSNS = 15mΩ) Internal Temperature Measurement: 0.125°C LSB, ±3°C Accuracy Two 11-Bit Aux Input Voltage Measurements: ±8 LSB Accuracy, Ratiometric Inputs Eliminate Supply Accuracy Issues VOUT Pin Drives Resistive Dividers, Reduces Current Consumption 2-Wire Interface Low Power Consumption: Active Current: 50 μA typ, 80μA max Sleep Current: 1 μA typ, 3μA max ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE DS2786G+ -20ºC to +70ºC 10-pin 3mm×3mm TDFN DS2786G+T&R -20ºC to +70ºC DS2786G+ in Tape-and-Reel + Denotes lead-free package. PIN CONFIGURATION 3mm x 3mm TDFN-10 Top View DS2786 Standalone OCV-Based Fuel Gauge www.maxim-ic.com Commands, Registers, and Modes are capitalized for clarity. |
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