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BQ4050: PTC query

Vinay Mande
Prodigy 95 points
Part Number: BQ4050
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

Hi,

I have designed a BQ4050 BMS by referring to the EVM. While designing the PCB, I placed the PTC near the FET. However, after configuring the BMS, the FET temperature is showing a negative value.

My queries regarding this are:

1. What is the significance of the PTC pin, and what temperature does it read? How does it work?
2. Can I see the value read by the PTC in the BQStudio app?
3. Is there any settings that I have to configure to get the PTC temperature value in BQStudio?
4. Is the PTC part of any hardware protection system?


Best Regards,
Vinay

  • 0
    TI__Mastermind 26945 points

    Hello Vinay,

    Your ticket has been assigned and will be answered promptly.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    TI__Mastermind 26945 points

    Hello Vinay,

    1. The significance of the PTC pin is that it reads the temperature coming from PTC component. The way that it works is that the PTC component is a variable resistor that increase the resistance as the temperature goes higher and voltage is passed through and the PTC pin sense the voltage difference from the component.

    2.) The PTC main function is to act a a permanent failure mode command and placed near the CHG/DSG FET. You can monitor the ManufacturerAccess() 0x0053 PFStatus bit23. The feature should already be enable by default however you would need to change the value if the default setting is not good enough.

    3.) Within the ManufacturerAccess() 0x0053 Bit 23 you need to enable or disable the PTC Failure, 


    4.) The PTC hardware design is attached below and the application of the PTC is attached below