SLUA790 November   2016 BQ34110 , BQ34Z100-G1 , BQ35100

 

  1.   Using I2C Communications With the bq34110, bq35100, and bq34z100-G1 Series of Gas Gauges
    1.     Trademarks
    2. 1 Example 1: Reading Cell Voltage
    3. 2 Example 2: Reading the Firmware Version
      1. 2.1 Standard I2C Commands
      2. 2.2 Extended I2C Commands
      3. 2.3 Control Subcommands
      4. 2.4 Data Flash Access for the bq34z100-G1
    4. 3 Data Flash Access for the bq34110 and bq35100
    5. 4 Summary
    6. 5 Glossary: Control-Bit-Sequence Definitions

2.3 Control Subcommands

Example 1:

DEVICE_TYPE Control() Subcommand 0001 and the correct answer is 0100 for the bq34z100-G1.

Use the I2C Master Control Panel section to read the flash.

ENTER: Start Register 00, Bytes to Write 0100 and PRESS the Write button.

The I2C words occur in the following order in the data stream: AA, 00, 01, 00.

ENTER: Start Register 00, Number of Bytes to Read 2 and PRESS the Read button.

The I2C words occur in the following order in the data stream: AA, 00, AB, 00, 01.

The device returns 0001, which is Little Endian for 0100. This is the DEVICE_TYPE for the bq34z100-G1.

fig06_slua790.pngFigure 6. I2C Control Subcommand Reading DEVICE_TYPE

Example 2:

CHEM_ID Control() Subcommand 0008 and the correct answer is 0107 for the bq34z100-G1.

Use the I2C Master Control Panel section to read the flash.

ENTER: Start Register 00, Bytes to Write 0800 and PRESS the Write button.

The I2C words occur in the following order in the data stream: AA, 00, 08, 00.

ENTER: Start Register 00, Number of Bytes to Read 2 and PRESS the Read button.

The I2C words occur in the following order in the data stream: AA, 00, AB, 07, 01.

The device returns 0701, which is Little Endian for 0107. This is the default ChemID for the bq34z100-G1.

fig07_slua790.pngFigure 7. I2C Control Subcommand Reading CHEM_ID

Example 3:

FW_VERSION Control() Subcommand 0002 returns both the DEVICE_NUMBER and the FW_VERSION on the bq34110 and bq35100. You must read 4 bytes of data.

Use the I2C Master Control Panel section to read the flash.

ENTER: Start Register 3E, Bytes to Write 0200 and PRESS the Write button.

The I2C words occur in the following order in the data stream: AA, 3E, 02, 00.

ENTER: Start Register 40, Number of Bytes to Read 4 and PRESS the Read button.

The I2C words occur in the following order in the data stream: AA, 40, AB, 01, 00, 01, 02.

The device returns 0100 0102 and it is not returned Little Endian. The DEVICE_NUMBER is 0100 for the bq35100 and the FW_VERSION is 0102.

fig08_slua790.pngFigure 8. I2C Control Subcommand Reading FW_VERSION