SLUAAM4 December   2023 BQ76905 , BQ76907

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Direct Commands
    1. 1.1 Alarm Enable - 0x66
    2. 1.2 Cell 1 Voltage - 0x14
    3. 1.3 Internal Temperature - 0x28
    4. 1.4 CC2 Current - 0x3A
    5. 1.5 Direct Command Summary
      1. 1.5.1 Disabling Auto Refresh
  5. 2Subcommands
    1. 2.1 DEVICE_NUMBER - 0x0001
    2. 2.2 FET_ENABLE - 0x0022
    3. 2.3 RESET - 0x0012
    4. 2.4 CB_ACTIVE_CELLS - 0x0083
    5. 2.5 Subcommand Summary
  6. 3Reading and Writing RAM Registers
    1. 3.1 Read Enabled Protections A
    2. 3.2 Enter CONFIG_UPDATE Mode
    3. 3.3 Write Enabled Protections A
    4. 3.4 Write VCell Mode
    5. 3.5 Exit CONFIG_UPDATE Mode
    6. 3.6 Reading and Writing RAM Registers Summary
  7. 4I2C With CRC
  8. 5Simple Code Examples
  9. 6References

3 Reading and Writing RAM Registers

A full view of registers in RAM can be found in the device-specific Technical Reference Manual and also in the Data Memory screen of BQStudio. To enable viewing the RAM register addresses in BQStudio, go to the Window->Preferences menu and select Show Advanced Views. Reading from a RAM register is accomplished by writing the register address to 0x3E and then reading from the data buffer starting at 0x40. Writing to a RAM register starts with writing the register address to 0x3E followed by the data, followed by a write to 0x60/0x61 with the checksum and length. The checksum and length calculation is described more in the data sheet, but is illustrated in the following examples.

Note: When writing to RAM registers, the recommendation is to first enter CONFIG_UPDATE mode and then perform the command to exit CONFIG_UPDATE mode once complete. This makes sure there is stable operation while settings are being modified.