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[BQ20Z90DBT] Inquiry about level problem of SMBC/SMBD communication line

MJ Jeon
Genius 5240 points

Hi, TI support team

Inquiries have been received from customers regarding the following problems.

Currently, it is being reviewed for application to the fuel gauge on the battery pack side, and a problem with the level of the communication waveform was found during the test.

This is a problem that the Low level does not drop to 0V as shown in the waveform below.

Please advise on the cause of this problem.

In this regard, we are asking about the damping resistor applied to the reference circuit diagram of the datasheet.

- Why are R18, R19, R20, R21 (100 ohm) applied?

Thanks.

Regards,

MJ

  • 0
    TI__Guru 57697 points

    Hello MJ,

    The damping resistors are part of ESD protection.The dark line shows the battery system interface, so the other 100ohm is on the host side. There will be a slight voltage instead of 0. If that is not desired then you can reduce the value of the resistor - smaller values will offer lesser protection.