DS2782

Features:

Precision Voltage, Temperature, and Current Measurement System
Accurate 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 User EEPROM or 16-Byte User EEPROM and Unique 64-bit ID
Industry 2-Wire Interface with Programmable Slave Address
Tiny 8-Pin TSSOP Package Embeds Easily in Battery Packs Using Thin Prismatic Cells


Application

Digital Still Cameras
Sub-Notebook Computers
Handheld PC Data Terminals
3G Multimedia Wireless Handsets


Pinout




Specifications

Voltage Range on Any Pin Relative to V_SS                                 -0.3V to +6.0V
Voltage on VIN Relative to V_SS                                              -0.3V to V_DD+0.3
Operating Temperature Range                                                  -40 to +85
Storage Temperature Range                                                   -55 to +125
Soldering Temperature                      See IPC/JEDEC J-STD-020A Specification

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.


Description

The DS2782 measures voltage, temperature and current, and estimates available capacity for rechargeable lithium ion and lithium-ion polymer batteries. Cell characteristics and application parameters used in the calculations are stored in onchip EEPROM. The DS2784 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 reported in mAh remaining and percentage of full.