Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells 1-2 Cells Communication interface HDQ Battery capacity (Min) (mAh) 100 Battery capacity (Max) (mAh) 14000 Implementation Pack External capacity indication None Features Cell Balancing, Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing External, Internal open-in-new Find other Battery fuel gauges

Package | Pins | Size

VSON (DRZ) 12 10 mm² 4 x 2.5 open-in-new Find other Battery fuel gauges


  • High-Accuracy Coulomb Counter with Input Offset
    Error < 1 µV (Typical)
  • High-Side FET Drive Allows Serial Bus
    Communication During Fault Conditions
  • Analog Front End with Two Independent ADCs
    • Support for Simultaneous Current and Voltage
  • Bus Communications Interface Options
    • I2C
    • HDQ
  • SHA-1 Hash Message Authentication Code
    (HMAC) Responder for Increased Battery Pack
    • Split Key (2 × 64) Stored in Secure Memory
  • Programmable Protection Levels for:
    • Overcurrent in Discharge
    • Short-Circuit Current in Charge
    • Short-Circuit Current in Discharge
    • Overvoltage
    • Undervoltage
    • Overtemperature
  • Supports a 1-mΩ to 3-mΩ Current Sense Resistor
  • Compact 12-Terminal SON Package (DRZ)
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The bq78z100 device provides a fully integrated pack-based solution with a flash programmable custom reduced instruction-set CPU (RISC), safety protection, and authentication for 1-series to 2-series cell Li-Ion and Li-Polymer battery packs.

The bq78z100 gas gauge communicates via an I2C-compatible interface or single-wire HDQ interface and combines an ultra-low-power, high-speed TI bqBMP processor, high-accuracy analog measurement capabilities, integrated flash memory, an array of peripheral and communication ports, an N-channel FET drive, and a SHA-1 Authentication transform responder into a complete, high-performance battery management solution.

The bq78z100 device provides an array of battery and system safety functions, including overcurrent in discharge, short circuit in charge, and short circuit in discharge protection for the battery, as well as FET protection for the N-channel FETs, internal AFE watchdog, and cell balancing. Through firmware, the devices can provide a larger array of features including protection against overvoltage, undervoltage, overtemperature, and more.

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Technical documentation

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Type Title Date
* Data sheet bq78z100 Impedance Track Gas Gauge for 1-Series to 2-Series Li-Ion/Li-Polymer Battery Packs datasheet Sep. 14, 2015
* User guide bq78z100 Technical Reference Manual (Rev. A) Sep. 15, 2016
Application note How to complete a successful learning cycle for the bq28z610/bq78z100 Jun. 23, 2016
Technical article Design a battery fuel gauge for 2S battery packs Mar. 12, 2016
User guide bq78z100EVM 1s-2s Li-ion Battery Pack Manager Evaluation Module Sep. 14, 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The bq78z100EVM-532 evaluation module (EVM) is a complete evaluation system for the bq78z100 or bq294502 battery management system. The EVM includes one bq78z100 and bq294502 circuit module and a link to Windows™ based PC software. The circuit module includes one bq78z100  integrated (...)

  • Complete evaluation system for the bq78z100EVM 1s-2s Battery Pack Manager Evaluation Module and bq294502 independent overvoltage protection IC
  • Populated circuit module for quick setup
  • Software that allows data logging for system analysis

Software development

SLUC601A.ZIP (4215 KB)

Design tools & simulation

document-generic User guide

Reference designs

1 to 2s HDQ Li-Ion Battery Pack Manager Reference Design
TIDA-00884 — The Texas Instruments bq78z100 device is a Battery Pack Manager that integrates gas gauging, and protection for complete autonomous operation of 1-series to 2-series cell Li-Ion and Li-Polymer battery packs. The architecture enables communication between the fuel gauging processor and an external (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
SON (DRZ) 12 View options

Ordering & quality

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  • MSL rating/Peak reflow
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  • Ongoing reliability monitoring

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