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STC3105

Battery monitor IC with alarm output for gas gauge applications
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The STC3105 battery monitor includes the hardware functions required to implement a low-cost gas gauge for battery monitoring. The STC3105 uses accurate measurements of the battery voltage to estimate a battery’s state-of-charge (SOC). It uses a low cost sense resistor to precisely sense the charge or discharge states, detect light-load conditions without ambiguity for voltage measurements, and accurate SOC calculation. The coulomb counter method is used for SOC tracking in high-load conditions.

An alarm output signals a low SOC condition, and can also indicate low battery voltage. The alarm threshold levels are programmable.

The device is programmable through an I2C interface.

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Errata Sheet
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Datasheet

Key Features

  • 0.5% accuracy battery voltage monitoring
  • Low battery alarm output with programmable thresholds
  • Low power: 60 μA in power-saving mode, 2 μA max in standby mode
  • Ideal for implementation of robust gas gauge systems using open-circuit voltage and coulomb counter methods
  • Small 3x2 mm package

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS8643: Battery monitor IC with alarm output for gas gauge applications
1.0 321 KB

Application Notes

Description Version Size
pdf
AN3395: Sensing resistor selection and usage in STC310x battery monitoring applications
1.2 149 KB

User Manual

Description Version Size
pdf
UM1054: STEVAL-ISB013v1 demonstration board based on the STC3105 battery monitor IC with alarm output for gas gauge applications
1.2 305 KB
pdf
UM1481: STEVAL-ISB012V1 Li-Ion battery monitor and gas-gauge based on the STC3105
1.0 5,356 KB

Presentations & Training Material

Presentations

Description Version Size
pdf
ST offering in Wearable - Analog and Mixed Signal Portfolio
1,508 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-ISB012V1 Battery monitoring system demonstration board based on the STC3105
STEVAL-ISB013V1 Battery monitor demonstration board with alarm output for gas gauge applications based on the STC3105

Publications and Collaterals

Brochure

Description Version Size
pdf
Analog ICs for wearable devices
981 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STC3105IQTActiveTDFN 3.0X2.0X0.75 8L PITCH 0.65Tape And Reel-4085_-1Distributor reported inventory date: 2014-10-23
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
P&SOrder NowASIA/PACIFIC12941
FUTUREOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE15631
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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