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THVD4431A: Help to review the schematics and check the waveform

Rannie Zhou
Expert 6070 points

Part Number: THVD4431A

Hi expert,

Could you please help to check my customer schematics?RS232-RS485 20260415 - Copy.pdf

I also post the waveform they captured here. Can you help to check whether this waveform is right and indicate the RS-485 works well? (The waveform was captured on the board with UART3 and 4 are connected by a cable. UART4 as TX send message to UART3)

TI_4M fail-1.png

  

BRs,

Rannie

  • 0
    TI__Guru* 81641 points

    Hi Rannie,

    I don't see any issues with the scopeshot. It looks like the transmitted data is appearing on the receiver and is mirrored correctly.

    From the schematic:

    • Pinout is okay, Pin9 (VIO) is shorted to Vcc so no option for level translation
    • all charge pump caps are rated for atleast 2x of VoH/VoL
    • All input pins are biased (some pins are already internally biased on the A version)

    Overall okay.

    -Bobby