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BQ4050: Is the Pres pin of the BQ4050 a high level when it is in a floating state?

Jia Scofield
Prodigy 60 points
Part Number: BQ4050

Hi Expert，

Is the Pres pin of the BQ4050 a high level when it is in a floating state?

Does the chip pull up a high level internally by default?

Is there an introduction in the specification?

  • 0
    Prodigy 60 points

    When this pin is connected to external GND, the system judges low level?

    Determined as high level when floating?

  • 0 in reply to Jia Scofield
    Prodigy 60 points

    When NR=0 is set, PRES is externally grounded. At this time, the DSG&CHG MOS is turned off, and the communication is disconnected. What is the state of the chip?

    Does self-consumption belong to the part of the red box in the picture below?

  • 0 in reply to Jia Scofield
    Prodigy 60 points

    If the cell voltage = 11V, and the external 100Ω resistor is connected to ground, how much will the self-consumption increase when the PRES function is activated?

  • 0 in reply to Jia Scofield
    TI__Guru** 105590 points

    Hello Jia,

    If you have additional questions you can make a new thread for each question so the answers are easier to search for others, it is also easier for us to parse the question.

    The PRES pin is pulsed every 250ms with a weak pull-up resistor, if the voltage does not pass the voltage input high threshold due to a pull-down resistor when the system is connected or the capacitance is high enough to keep the voltage below the threshold while sampling then the system will be considered as present.

    If the PRES bit is low then the FETs will be off, you can see this in the TRM section 4.12 Charge Disable and Discharge Disable. When the system is not present the gauge will most likely be in sleep mode so the value you highlighted would be the correct average current for the gauge.

    Sincerely,

    Wyatt Keller