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  • Case ID: 348997
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nPM1300 Battery Status Voltage value

pipoket

Dear DevZone support,

I'm currently evaluating nPM1300 for Lithium Polymer battery management and charging and would like to ask a question.

I understand that I can see VBAT from "Voltage" value of  "Battery Status". But when I enable charging, it seems like that it stays at VTERM voltage.

For example, when nPM PowerUP v2.2.1 shows that VBAT is 4.44V, the actual voltage measured from terminal of the battery is 4.035V. Is this an intended behavior?

I would like to charge the LiPo battery up to VTERM value of 4.4V and ITERM value of 200mA, but it seems like that the actual battery voltage never reaches VTERM.

Could the large capacity of battery be a problem? I'm trying to use nPM1300 with 5050mAh capacity LiPo battery. 

Parents
  • +1

    Hi,

    For example, when nPM PowerUP v2.2.1 shows that VBAT is 4.44V, the actual voltage measured from terminal of the battery is 4.035V. Is this an intended behavior?

    When measuring is the battery still connected to the nPM1300 and charging? If the battery is still charging the charger could still be in constant current mode, in this case the voltage measured would be lower than VTERM. To check what state the charger is in you can read the BCHGCHARGESTATUS register using I2C.

    I would like to charge the LiPo battery up to VTERM value of 4.4V and ITERM value of 200mA, but it seems like that the actual battery voltage never reaches VTERM.

    ITERM of 200mA seems high, ITERM is the termination current where the charger stops charging in constant voltage mode. This is set as a percentage, 10%(default) or 20% of the ICHG(charge current). 

    Could the large capacity of battery be a problem? I'm trying to use nPM1300 with 5050mAh capacity LiPo battery. 

    The large battery shouldn't be a issue, the only downside with a larger battery is a longer charge time.

     

    Best regards,

    Bendik

Reply
  • +1

    Hi,

    For example, when nPM PowerUP v2.2.1 shows that VBAT is 4.44V, the actual voltage measured from terminal of the battery is 4.035V. Is this an intended behavior?

    When measuring is the battery still connected to the nPM1300 and charging? If the battery is still charging the charger could still be in constant current mode, in this case the voltage measured would be lower than VTERM. To check what state the charger is in you can read the BCHGCHARGESTATUS register using I2C.

    I would like to charge the LiPo battery up to VTERM value of 4.4V and ITERM value of 200mA, but it seems like that the actual battery voltage never reaches VTERM.

    ITERM of 200mA seems high, ITERM is the termination current where the charger stops charging in constant voltage mode. This is set as a percentage, 10%(default) or 20% of the ICHG(charge current). 

    Could the large capacity of battery be a problem? I'm trying to use nPM1300 with 5050mAh capacity LiPo battery. 

    The large battery shouldn't be a issue, the only downside with a larger battery is a longer charge time.

     

    Best regards,

    Bendik

Children
  • 0 in reply to Bendik Heiskel

    Thank you for the response.

    The problem was the connection between battery and nPM1300. I used alligator clip and jumper wire to connect the LiPo battery anode/cathode tabs and nPM1300. Such loose connections caused significant contact and wire resistance which resulted in almost 0.5V voltage drop.

    The problem is solved once I soldered the wire to the battery tab and used the JST SH1.0 connector on nPM1300 board.

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