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TLC5941-Q1: Monitoring SID without XERR

Kevin Schmidgall
Expert 3010 points
Part Number: TLC5941-Q1

Hello,

I have an application where there is not GPIO resources to monitor XERR but we need LED Open Detection. The plan is to periodically read out SID to see if there is an error in the SID register.

My question is what is the proper time to pulse XLAT and read out SID? When does XERR transition back from low to high - once the XLAT is pulsed and SID is read out or once the error goes away (which means they could miss it when LEDs are PWM'd)?

Regards,

Kevin

  • 0
    TI__Genius 15776 points

    Hi Kevin.

    Could you tell me your application first, and the function you need.

  • 0 in reply to Frank Qiu
    TI__Expert 3010 points

    Hi Frank,

    This is automotive interior lighting.

    What I need to know - when is the proper time to pulse XLAT to latch LOD and TEF data reliably if you are not monitoring XERR?

    Basically, XERR is not being monitored but we need to know if there is an error. After looking through the datasheet and digging deeper into figure 16, I believe i have the answer:

    You need to pulse XLAT after T > TsuLOD (1.51us) to ensure that all channels should be active. But also if you pulse XLAT after too long then you could miss the error since a channel could have turned off once its GS counter value is met.

    Regards,

    Kevin

  • 0 in reply to Kevin Schmidgall
    TI__Genius 15776 points

    Hi

    Because you can't monitor the XERR, so I think you have to take a certain risk of can't read the error.