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Stand-Alone Fuel-Gauge IC with LED Display Drivers

The Industry's Smallest Stand-Alone Fuel Gauge That Integrates LED Display Drivers and a Pushbutton Input for Multiple Li+ Batteries

Product Details

Key Features

Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Battery Type 1-10 Cell Li-Ion
Fuel Gauge Algorithm FuelPack
Interface 1-Wire
User Data Storage (Bytes) 16 EEPROM
Parameters Measured Current
Temperature
Voltage
End Equipment Pack
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 5.5
Package/Pins TSSOP/14
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
4.63
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Fuel Gauges, Protectors, and Monitors
Functions Fuel Gauge
Battery Type 1-10 Cell Li-Ion
Fuel Gauge Algorithm FuelPack
Interface 1-Wire
User Data Storage (Bytes) 16 EEPROM
Parameters Measured Current
Temperature
Voltage
End Equipment Pack
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 5.5
Package/Pins TSSOP/14
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
4.63

Key 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, 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 Battery/Application Parameter EEPROM
  • 16-Byte User EEPROM
  • Unique ID and Multidrop 1-Wire® Interface
  • 14-Pin TSSOP Package

Applications/Uses

  • Digital Cameras
  • Electric Bicycles
  • Electric Vehicles
  • Power Tools
  • Uninterruptible Power Supply

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.

Simplified Block Diagram

DS2788 measures voltage, temperature, and current, and estimates available capacity for rechargeable lithium-ion (Li+) and Li+ polymer batteries | Typical Operating Circuit DS2788 measures voltage, temperature, and current, and estimates available capacity for rechargeable lithium-ion (Li+) and Li+ polymer batteries | Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .