SLVSMB0 June   2026

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1 Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
    4. 1.4 Device Information
  6. 2 Hardware
    1. 2.1 Hardware Requirements
    2. 2.2 Connecting the BQ27Z855 Circuit Module to a Battery Pack
    3. 2.3 EVM Jumpers and Terminal Block Description
  7. 3 Software
    1. 3.1 System Requirements
    2. 3.2 Software Installation
    3. 3.3 Updating Firmware
    4. 3.4 Troubleshooting Unexpected Dialog Boxes
  8. 4 Using bqStudio
    1. 4.1 Starting the Program
    2. 4.2 Setting Programmable BQ27Z855 Options
    3. 4.3 Configuring the Integrated Linear Battery Charger
  9. 5 Calibrating Gauge Measurements
    1. 5.1 Voltage Calibration
    2. 5.2 Current Calibration
  10. 6 Chemical ID
    1. 6.1 Chemical ID Selection Process
    2. 6.2 Hardware Requirements and Setup
    3. 6.3 Logging Data in bqStudio
    4. 6.4 GPCChem Tool
    5. 6.5 Programming a Chemical ID
    6. 6.6 Further Resources for Chemical ID Process
  11. 7 Learning Cycle and Golden Image
    1. 7.1 Learning Cycle Process Description
    2. 7.2 Data Memory Configuration
    3. 7.3 Learning Cycle Steps
    4. 7.4 Low Temperature Optimization
    5. 7.5 Creating the Golden Image File
    6. 7.6 Programming the Golden Image File
  12. 8 Gauge Communication
    1. 8.1 Advanced Communication in bqStudio
    2. 8.2 Standard Data Commands
    3. 8.3 Manufacturer Access Commands
    4. 8.4 Further Resources on Gauge Communication
  13. 9 BQ27Z855-Based Circuit Module
    1. 9.1 Circuit Module Connections
    2. 9.2 Pin Descriptions
  14. 10Hardware Design Files
    1. 10.1 Schematic
    2. 10.2 Bill of Materials (BOM)
    3. 10.3 PCB Layouts
  15. 11Additional Information
    1.     Trademarks

1.1 Introduction

The BQ27Z855EVM comes with the BQ27Z855 integrated gas gauge and protection IC with external high-side protection N-Channel FETs. This user's guide will walk you through the following tasks:

  • Connect the necessary components together to power up the EVM
  • Installation of the necessary Texas Instruments software tools
  • Setup of the EVM with additional hardware and software
  • Configure the integrated linear battery charger
  • Calibrate the BQ27Z855 voltage and current readings
  • Perform the Chemical ID selection process
  • Optimize gauge reporting with a Learning Cycle
  • Create and upload a Golden Image
  • Use Advanced Communication with the gauge

These tasks will guide users of the BQ27Z855EVM through the process required to prepare for production with the BQ27Z855 by creating a "Golden Pack". A Golden Pack is a single gauge and battery that has had optimization and configuration processes performed on it during the development stage. The resulting values are extracted from the Golden Pack gauge into the “Golden File” or “Golden Image”. The Golden File is a flash image programmed into every gauge used in mass production as there should be minimal pack-to-pack variation during a well-controlled manufacturing process. The Dynamic Z-Track™ algorithm enables the gauge to continue to learn once a pack is deployed to account for manufacturing differences, field conditions, and battery degradation over its lifetime.