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BQ25622EVM: 在BQSTUDIO設定ICHG=2A，實際輸出只有1A

Paul Chang
Prodigy 40 points
Part Number: BQ25622EVM
Other Parts Discussed in Thread: BQSTUDIO, BQ25622

待測電池規格:2580mAh, 4.4VDC

使用工具:BQ25622EVM+MSP430+BQSTUDIO

在BQSTUDIO設定ICHG=2A，但電源供應器實際輸出卻只有1A，當我設定ICHG小於1A時都算正常，請問如何解除ICHG限制呢?

  • 0
    TI__Mastermind 24685 points

    Hi Paul, 

    Thank you for reaching out via E2E. Please help to translate your question into English so we can support. 

    Best Regards,

    Garrett 

  • 0 in reply to Garrett Kreger
    Prodigy 40 points

    Battery rating:2580mAh, 4.4VDC

    Tools:BQ25622EVM+MSP430+BQSTUDIO

    Question:When i setting ICHG=2A in BQSTUDIO, The BQ25622EVM can't charge to 2A  and it just keep on 1A, how do i seting charge current more than 2A?

  • 0 in reply to Paul Chang
    TI__Mastermind 24685 points

    Hi Paul, 

    The BQ25622EVM has a 2.5kohm resistor [R22 in EVM schematic] installed at ILIM pin to set a 1A input current limit. This is likely what is preventing you from charging at higher currents. To bypass this 1A current limit please set REG0x19 bit 2 = 0b to disable the ILIM pin current limit. 

    Alternatively you can replace R22 with a smaller valued resistor to raise the current limit. For example using a 1kohm resistor at ILIM will set a 2.5A current limit. 

    Best Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    Prodigy 40 points

    Dear Garrett,

    To bypass this 1A current limit please set REG0x19 bit 2 = 0b to disable the ILIM pin current limit. 

    Sorry, Where is bit 2 = 0b in REG0x19 ?

    Paul

  • 0 in reply to Paul Chang
    TI__Mastermind 24685 points

    Hi Paul, 

    Referring to the screenshot you provided bit 2 in REG0x19 is the checkbox with the label '620-EN_12V / 622-EN_EXTILIM'. When this field is unchecked the 1A current limit set by ILIM pin resistor is ignored. 

    Let me also point out the watchdog timer will need to be disabled to prevent the 1A current limit from re-enabling after watchdog timer expiration. 

    Best Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    Prodigy 40 points

    Dear Garrett,

    When i read the log, how do i check charge current more than 2A? 

    ↓↓↓

  • 0 in reply to Paul Chang
    TI__Mastermind 24685 points

    Hi Paul, 

    The way to have the BQ25622 report the charge current is by using the ADC feature. You will need to enable the ADC by setting ADC_EN = 1b (REG0x26 bit 7). After the ADC is enabled you can read the charge current via IBAT_ADC register. The address is REG0x2A. 

    If you use the field view window on the GUI you can see all ADC monitor outputs at once as shown below. 

    Best Regards,

    Garrett