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TLC5941: TLC5941: XERR is always output low

user5850121
Prodigy 20 points
Part Number: TLC5941

TLC5941:A total of 16 outputs ,I only used 15 outputs.I have added an external pull-up resistor in this XERR pin .But XERR is always output low. Then  I am tryiing setting the XLAT pin. When XLAT is High ,XERR is always output High .I don't know what went wrong. Is the program wrong or is the hardware wrong? I don't know what to do now.The following is the schematic.

  • 0
    TI__Expert 3190 points

    Hi,

    Because there is a disconnected pin in your design, and the device has the LOD function, which will pull the XERR pin to GND when an open LED is detected.

    Please refer to datasheet page 13.

    Also it needs a falling edge for the sequence of the device, for example, th1. without falling edge,  the channels of the device can turn on, and  LOD can not be detected, so the XERR will stay high.

    Let me know if you have any concern, thanks!

    Regards!

    Shawn.

  • 0 in reply to Shawn Ding
    Prodigy 20 points

    Thank you for your answer.

    I use the flying wire to ground the output.And I have added an external pull-up resistor in this XERR pin .Then I changed the program. The BLANK is LOW. Pull the XLAT high and then pull it low ,but the XERR is always output high.Can you tell me how to set up hardware and software? Please.  Also, I didn't find the page that was different from what I set.

  • 0 in reply to user5850121
    TI__Expert 3190 points
    Yes, it is right as you depicted, please refer to Figure 13 of the datasheet for a double check.
    Have you sent the data for unconnected channel? since LOD is just effect when channel turn on.

    Regards!
    Shawn.