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TMS570LC4357: Tolerance Time Window for DCC

Rabie Hammoud
Intellectual 325 points
Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Hello,

I implemented a self test for the HF_LPO using the DCC (Dual Clock Compare) unit. So I selected my Reference clock to be the "OSCIN" and used the Values (Seeds, Valid0) generated by HALCoGen. The problem is, while running this test on several MCUs the Tolerance Window (Valid0Seed) varies too large. For one of the MCUs it is about 5.1% and for the other it is about 8.6% and so on. 

Could someone please help me solving this issue, why the same test (DCC) on different MCUs from the same product family needs different Tolerance Windows?

Best Regards

  • 0
    TI__Mastermind 21425 points
    Hello,
    The LPO clock sources are not very accurate and vary significantly. HF LPO has a nominal frequency of 9.6MHz and a range from 5.5MHz to 19.5MHz. After trimming the range will be 8.0-11.0 MHz ( Datasheet Table 6-13 ).
    The HF LPO range varies considerably around 9.6MHz from device to device.

    Best regards,
    Miro