Stand-Alone Fuel Gauge - Maxim Integrated Products - #1

DS2780

Standalone Fuel Gauge IC

g dallas VUiyJXOUI

W SEMICONDUCTOR M M ^ M

The DS2780 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 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 reported in mAh remaining and percentage of full.

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

■ Precision Voltage, Temperature, and Current Measurement System

■ Internal Time Base is Accurate and Temperature

Stable

■ 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

■ Tiny 8-pin TSSOP & 10-pin TDFN Package Embeds Easily in Battery Packs Using Thin Prismatic Cells

PK+

500

1K

150

DATA

1 ceil

Li-Ion " Battery

5.6V

TSSOP-8

¹ Protection .

i droit i

0.1uF

RSNS

PK-

■AAAr

1 of 29