Lithium Primary Battery Fuel Gauge and End-of-Service Monitor - BQ35100

BQ35100 (ACTIVE)

Lithium Primary Battery Fuel Gauge and End-of-Service Monitor



The bq35100 Battery Fuel Gauge and End-Of-Service Monitor provides highly configurable fuel gauging for non-rechargeable lithium primary batteries—without requiring forced discharge of the battery. Built so that optimization is not necessary, the patented TI gauging algorithms support replaceable batteries and enable accurate results with ultra-low average power consumption through host control via the GAUGE ENABLE (GE) pin.

The fuel gauging functions use voltage, current, and temperature information to provide State-Of-Health (SOH) and End-Of-Service (EOS) data. The bq35100 device is only required to be powered long enough to gather data and to make calculations to support the selected algorithm and the frequency of updates required by the system.

The host can read the gathered data through a 400-kHz I2C bus. An ALERT output is also available to interrupt the host, based on a variety of configurable options.


  • Fuel Gauge for Single- and Multi-Cell Primary (Non-Rechargeable) Batteries
  • Supports Lithium Thionyl Chloride (LiSOCl2) and Lithium Manganese Dioxide (LiMnO2)
  • Provides Four Configurable Algorithm Options:
    • Coulomb Accumulation (ACC)
    • State-Of-Health (SOH)
    • End-Of-Service (EOS)
  • Ultra-Low Average Power Consumption Supported Through Gauge-Enable Control
  • Accurate Coulomb Counter, Voltage, and Temperature Measurement Options
  • I2C™ Host Communication, Providing Battery Parameter and Status Access
  • Configurable Host Interrupt
  • Data Logging Options
  • SHA-1 Authentication

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Parametrics Compare all products in Battery Fuel Gauge

Number of Series Cells
Cell Chemistry
Battery Capacity (Max) (mAh)
Communication Interface
Battery Capacity (Min) (mAh)
External Capacity Indication
Gas Gauge Algorithm
Cell Balancing
Special Features
Operating Temperature Range (C)
BQ35100 BQ27220 BQ27426 BQ27520-G4 BQ27542-G1 BQ27621-G1
2-4 Cells
>4 Cells
Single Cell   
Single Cell    Single Cell    Single Cell    Single Cell    Single Cell   
Primary Lithium    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer   
32000    29000    14000    32000    14600    6000   
I2C    I2C    I2C    I2C    HDQ
100    100    100    300    100    100   
None    None    None    None    None    None   
System    System    Pack    System   
Primary    CEDV    IT (High accuracy)    IT (High accuracy)    IT (High accuracy)    Dynamic Voltage Correlation   
N/A    N/A    N/A    N/A    N/A    N/A   
N/A    N/A    N/A    N/A    SHA-1 Authentication
Turbo Mode   
No Sense Resistor Required   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
14TSSOP    9DSBGA    9DSBGA    15DSBGA    12SON    9DSBGA