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

8.3 Manufacturer Access Commands

Manufacturer Access (MAC) commands are defined by Texas Instruments. MAC commands require a write to the AltManufacturerAccess() registers at 0x3E and 0x3F, and then an additional write to the AltManufacturerAccess() sub-command being used. The complete list of all MAC commands in the BQ27Z855 and an example of a Command Write operation with MAC commands can be found in the 0x00, 0x01 ManufacturerAccess() and 0x3E, 0x3F AltManufacturerAccess() chapter of the BQ27Z855 Technical Reference Manual.

Example: Read Chemical ID() to AltManufacturerAccess().

  1. Send Chemical ID() to AltManufacturerAccess().
    1. I2C Address (Hex) = AA
    2. Start Register (Hex) = 3E
    3. Bytes to Write (Decimal) = 06 00 (this write data must be written in little endian)
  2. Read the result from AltManufacturerAccess() and MACData().
    1. I2C Address (Hex) = AA
    2. Start Register (Hex) = 3E
    3. Number of Bytes to Read (Decimal) = 36
  3. View the results in Transaction Log.
    1. The first two bytes "06 00" is the MAC command (for verification)
    2. The second two bytes "10 12" are the ChemID in little-endian (the ChemID can be seen if the CHEM_ID button is checked in the Command window)
    3. The final two bytes is the checksum and length. The length here is 6. The checksum is 0xFF - (sum of the first length - 2 bytes). The length and checksum are used to validate the block response.

Figure 8-2 shows this in bqStudio. To perform this process, fill out all of the fields as shown, then click Write and Read.

BQ27Z855EVM MAC Command Example Figure 8-2 MAC Command Example