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BQ25756EVM: Reverse Mode

Lane Brooks
Prodigy 120 points

Part Number: BQ25756EVM
Other Parts Discussed in Thread: BQSTUDIO

Does the BQ25756EVM dev board support REVERSE mode?

It is not clear from the user guide if it is. If it is supported, can you provide a detailed list of the ways to reconfigure it for REVERSE mode? Like do you have to change Jumpers or Resistors or can it all be done from I2C registers?

  • 0
    TI__Genius 16365 points

    Hi Lane,

    Reverse mode works on the default EVM condition. Set your battery (or power supply) on the output and your load on the input, then configure your reverse mode settings via I2C. Once you set EN_REV=1 you should be in reverse mode.

    Let me know if there are any issues.

    Best regards,
    Michael Bradbourne

  • 0 in reply to Michael Bradbourne
    Prodigy 120 points

    What are the complete list of reverse mode I2C registers we would need to set? Or what exactly to we change in BQstudio to make it work?

    And we do not need to change any resistors to separate VAC/VAC_REV or ACVO/ACVU?

  • 0 in reply to Lane Brooks
    TI__Genius 16365 points
    Lane Brooks said:
    What are the complete list of reverse mode I2C registers we would need to set? Or what exactly to we change in BQstudio to make it work?

    It will work by just setting EN_REV=1 in register REG0x19_Power_Path_and_Reverse_Mode_Control. You can change the parameters of reverse mode via the following registers:

    • REG0x0A_Reverse_Mode_Input_Current _Limit
    • REG0x0C_Reverse_Mode_Input_Voltage _Limit
    • REG0x1D_TS_Reverse_Mode_Threshold _Control
    • REG0x1E_Reverse_Undervoltage_Control
    • REG0x62_Reverse_Mode_Battery_Discharge_Current
    Lane Brooks said:
    And we do not need to change any resistors to separate VAC/VAC_REV or ACVO/ACVU?

    Correct. VAC_REV is just VAC. ACOV/ACUV only function in forward mode.

    Best regards,
    Michael Bradbourne