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BQ24230 EVM DC Input Problems

Shaurya Agarwal
Prodigy 90 points
Other Parts Discussed in Thread: BQ24230

Hello, 

I purchased the BQ24230 Evaluation module and have been trying to conduct a simple power switching test with it. I hooked the output up to a breadboard with an LED and input a LiPo battery and a 9V DC input. 

The LED will light up with the battery power but for some reason the DC power is not routing through the module at all. It won't charge the battery or power the LED. I tested the DC input on the breadboard with a voltmeter and it has the correct voltage so the connection is fine. When I test the output point it only goes up to the voltage of the battery. 

I read the data sheet and tried the different combinations of settings controlled by the jumpers to charge the battery, switch power, etc. but nothing has worked so far. 

Any help would be greatly appreciated!

Thanks in advance, 

Shaurya 

  • 0
    TI__Guru**** 167236 points

    The 230 has a OVP protection circuit that kicks in at 6.5V and shuts down the IC.  If you lower the DC input below 6.5V, it should work.

  • 0 in reply to Jeff F
    Prodigy 90 points

    Jeff, 

    Thanks for your reply. I lowered the input to below 6 V and it still does not work. The input reads 5.5 V but the output is still 0 V. 

    Do I have to change anything on the board to make it work? 

    Thanks again, 

    Shaurya 

  • 0 in reply to Shaurya Agarwal
    TI__Mastermind 20570 points

    Hello Shaurya,

    What are the settings of the jumpers you have on the board? Please make sure that the settings for EN1 and EN2 is not in USB suspended mode (JP4 and JP5), and CE# pin is pulled low. Also, please check the voltage on TS pin. It should be between 300mV and 2100mV. If the voltage is outside this range, the charger will be disabled.  You can adjust R16 to change the voltage.

    Regards,

    Jing

  • 0 in reply to Jing Zou
    Prodigy 90 points

    Hey Jing, 

    Thanks for the suggestions. I made sure EN1 & EN2 were not in USB suspended mode and the CE pin is indeed pulled low. 

    However, the TS pin doesn't have any voltage across it when I check and adjusting the resistor doesn't change that either. 

    I connected both the battery and the DC input and both show a voltage going into the board but none of the LEDs light up. 

    Any more suggestions on what I should do, especially for the TS pin not having a voltage? 

    Best, 

    Shaurya 

  • 0 in reply to Shaurya Agarwal
    TI__Mastermind 20570 points

    Below is couple of the measurements that might help to figure out what the problem is:

    1. disconnect the DC supply and the battery, measure the resistance from TS to VSS. It should between 4k and 28k

    2. Connect the DC power only (5.5V), disconnect all the circuits that you connect to the board, measure the voltage across the output. LED indicating D2 should light up.

    3. Connect the DC power and your LED circuit, disconnect the battery, measure the voltgae at the output.

     

     

  • 0 in reply to Jing Zou
    Prodigy 90 points

    Jing, 

    You keep mentioning circuits connected to the board. I don't have anything connected to the board right now except a battery, DC input, and the output going to a breadboard. Should i have any other things connected to the board to make it work? 

    Also, none of the LEDs have lit up no matter what combination of inputs I've tried (including just connecting the DC power supply). I have the jumper on the jumper pins next to the LED. 

    Thanks, 

    Shaurya 

  • 0 in reply to Shaurya Agarwal
    TI__Mastermind 20570 points

    The circuit I mentioned is refer to your breadboad. I double check the user's guide. The PG# is pulled to the output on the EVM. Since your output is not on, the LED for PG# will not come on. So please remove the jumper on that pin and connect a pull up resistor to the input. The LED should light up.

    Also please make sure resistance between TS and VSS is within its valid range.

  • 0 in reply to Jing Zou
    Prodigy 90 points

    Jing, 

    So based on your recommendations, here are the findings: 

    1. The resistance between TS and VSS is correct. 

    2. I connected the DC power supply but there's no voltage across the output. the D2 LED also did not light up. The input however shows that there is a 5.5 V input so the power supply is working. 

    3. Same result as #2. 

    I also connected a pull up resistor to the LED jumper and the LED still did not turn on. 

    At this point I think I may have a faulty EVM but if you have more tests to run, please let me know. Otherwise, is there any way to get a replacement part from TI? 

    Thanks, 

    Shaurya

  • 0 in reply to Shaurya Agarwal
    TI__Guru**** 167236 points

    What is the voltage on TS?

  • 0 in reply to Jeff F
    Prodigy 90 points

    Hey Jeff, 

    Sorry for the late reply, I was on vacation. 

    The voltage across TS is 0 V with both the DC input and the battery connected. 

    I'm still concerned about why the PGOOD LED won't light up when the battery is connected because the battery does route to the output correctly - doesn't that indicate that the board is not working correctly overall? 

    Thanks, 

    Shaurya 

  • 0 in reply to Shaurya Agarwal
    TI__Guru**** 167236 points

    The TS voltage must be between the voltage levels in the datasheet in order for the IC to charge the battery.


    Regarding the PG pin, can you remove all power from the EVM and test the LED with a voltmeter?  It should measure like a diode in one direction and open circuit in the other.  If it is damaged, you can replace with another LED or a resistor, using a voltmeter to measure the voltage at /PG.