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Original question:

TLC6C5724-Q1: facing ERROR while sending the data in sending GS data and GLCK

TLC6C5724-Q1: Unexpected LSD Faults on all other Drain Channels in TLC6C5724 When Only One LED is Turned ON

Murali Krishnan
Prodigy 20 points
Part Number: TLC6C5724-Q1

Tool/software:

Hi Team,

I am currently using the TLC6C5724 driver IC in my project with the following configuration:

  • VSENSE = 5V

  • LSD Threshold configured as VSENSE - 0.7V, i.e., 4.3V

  • IC is controlled via SPI in serial mode

  • Only one LED is turned ON through SPI command

  • The remaining outputs are currently unused

The issue I'm facing is:

  • When I turn ON a single LED using SPI, the ERROR pin goes LOW

  • After reading the SID (Status Information Data), all drains except the one that is ON are showing LSD (Low Side Short) faults

Could you please support for this issue

  • 0
    TI__Mastermind 34780 points

    Hi Murali,

    Our expert will give you feedback later.

  • 0
    TI__Genius 15496 points

    Hi Murali,

    Leaving unused channels floating and writing 0 brightness to them will still pull ERR pin down even it’s recommended way for the unused channels.

     

    1. We don’t have mask for individual channels.
    2. But you can distinguish open/short and unused channels from LOD-LSD result in SID register and GS value.

     

    Here is the suggestion for this:

    1. Use LED_ERR_MASK for the LOD and LSD to avoid unintended pull-down;
    2. Use software to detect LED status (open/short/ short-to-GND) and ignore the fault based on GS value.