• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 401 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

HF LPO thresholds for oscillator monitor TMS570LC4357

David Boehlen
Prodigy 40 points
Other Parts Discussed in Thread: TMS570LC4357

Hello, 

I have another Question regarding the HF LPO (TMS570LC4357)

Do the thresholds from figure 2-7 change for a trimmed HF LPO ? 

I don't understand how to calculate the thresholds 4,875 and 22. 

For min and max I know its: min = 5,5/4 = 1,375 ;  max = 19,5*4 = 78

Thanks 

David 

  • +1
    TI__Guru 73236 points

    Hi David,

    Yes, they will change for trimmed HF LPO frequency.

    For example, If my HFLPO frequency is 5.5 Mhz then my lower threshold will be 1.375Mhz (5.5/4) and Higher threshold will be 22Mhz (5.5*4). So that means any oscillator frequency less than 1.375Mhz or greater than 22Mhz will be considered as oscillator fail condition.

    And similarly, If my HFLPO frequency is 19.5 Mhz then my lower threshold will be 4.875Mhz (19.5/4) and Higher threshold will be 78Mhz (19.5*4). So that means any oscillator frequency less than 4.875Mhz or greater than 78Mhz will be considered as oscillator fail condition.

    In this way the thresholds for oscillator will change based on HF LPO frequency.

    --

    Thanks & regards,
    Jagadish.