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TXS4558: Schematic review

Shu-Cheng LIN
Guru 11785 points
Part Number: TXS4558

Hi Sirs,

Sorry to bother you.

Could you help check our schematic as below?

Any suggestion are welcome. Thanks!!

Schematic:

  • 0
    TI__Genius 16725 points

    Hi,

    I don't see any problems with your schematic. I have added our translation expert to review and see if they have any comments on this.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    TI__Guru 56790 points

    Hi Shu cheng,

    the CSEL is always at 0V due to the R47 resistor instead of being selectable from the MUX_SEL input? Currently it will not select the Sim2.

    The EN1 and EN2 are connected to Mux3.3V but the Vcc pin is connected to VSIM( different voltage than Mux3.3V?)

    Same with the CLKRUN1/2 pins tied to Mux3.3V? Having bypass caps on the Vbatt ,Vcc, Vsim1, Vsim2 pins are recommended as per fig 1 of datasheet.

  • 0 in reply to ShreyasRao
    Guru 11785 points

    Hi Sirs,

    Thanks for your reply.

    Update schematic here:

    Update answer as below

    Q: the CSEL is always at 0V due to the R47 resistor instead of being selectable from the MUX_SEL input? Currently it will not select the Sim2.

    A: MUX_SEL input will have the following software control H or L, the R47 & R42 HW  only for test, there will be switch to control 

    Q:The EN1 and EN2 are connected to Mux3.3V but the Vcc pin is connected to VSIM( different voltage than Mux3.3V?)

    A: Both EN1 and EN2 are enabled and directly connected to Mux3.3V. The Vcc pin voltage is modified to Mux3.3V, it's should not affect the VSIM voltage of 1.8V.

     

    Q:Same with the CLKRUN1/2 pins tied to Mux3.3V? Having bypass caps on the Vbatt ,Vcc, Vsim1, Vsim2 pins are recommended as per fig 1 of datasheet.

    A:The capacitor part has been modified, Please refer as below

     

  • 0 in reply to Shu-Cheng LIN
    TI__Guru 56790 points

    Ok, understood. looks good to me now.