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RTOS/TDA3: Remove OSC1 on TDA3 HW design

Sung-IL
Mastermind 30850 points

Part Number: TDA3

Tool/software: TI-RTOS

Dear Team,

My customer is designing TDA3 HW for ADAS camera module, and wants to know if OSC1 can be removed.

Is it possible to remove OSC1?

When I checked it on TRM and below e2e, it seemed it can be removed.

If OSC1 can be removed, what should be checked before removing OSC1?

Is there any issue when OSC1 was removed when they modified SW not to use SYS_CLK2 in below modules?

-Timers

-ADC
-RTIs
-DCCs
(run a search for SYS_CLK2 in the PRCM chapter)

If OSC1 was not used, OSC1 pin should be 'unconnected' or 'pull-down'?

Thanks and Best Regards,

SI.

  • 0
    TI__Expert 4885 points

    Hi, @Sung-IL

     

    Yes, the OSC1 can be removed if you don't use audio functionality. Furthermore, as Stan wrote in the cited thread, double check sysboot[14] is pulled low (=0) on the PCB.

     

    Removing the OSC1 you should ensure that the above modules are clocked from OSC0. You can use Clock tree toll ( ) for easier check of the modules-sourced clocks.

     

    According to the Table 4-1. Unused Balls Specific Connection Requirements B21 ball (xi_osc1) should be grounded if not used. THere are no specific requirements for the output of the oscillator xo_osc1 (C21 ball) so it should stay unconnected.

     

    Regards,

    Mariya