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LP5562: question about clock

user021864
Intellectual 2145 points
Part Number: LP5562

Hi, 

My customer is having question about the clock configuration about this part. 

They connect CLK_32K to ground but not sure if an external 32K clock is required in program execution engine mode.

Below is their main questions: 

 

  1. Whether the led could be controlled via execution engines without CLK_32K ?
  2. There is any impact (such as power consumption) without CLK_32K if execution engines work use internal clock ?
  3. What is the use case requiring an external 32K clock being as a must?

Please let us know if further information needed. 

Thanks a lot. 

  • 0
    TI__Genius 12915 points

    Hi,

    1. Yes engine could be executed by internal clock.

    2. There should be no extra power consumption by using internal clock. one thing should be noticed is that  if internal clock is used in the run program mode, operation mode needs to be written disabled (00b) before disabling the chip (with CHIP_EN bit or EN pin) to ensure that the sequence starts from the correct program counter (PC) value when restarting the sequence.

    3. External clock was recommended to synchronize much LED drivers. if customer only use one or have no synchronization requirement, internal clock is totally OK.