DS2788

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


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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.
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 Enlarge+

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

See parametric specs for Battery Fuel Gauges, Protectors, and Monitors (52)


Part NumberFunctionsBattery TypeInterfaceUser Data Storage
(Bytes)
Parameters MeasuredFuel Gauge AlgorithmApplicationsVSUPPLY
(V)
VSUPPLY
(V)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxSee Notes
DS2788 Fuel Gauge1-10 Cell Li-Ion1-Wire16 EEPROM
Current
Temperature
Voltage
FuelPackPack2.55.5
TSSOP/14
-40 to +85$3.97 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: DS2788.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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