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LPFLL clock accuracy issue of MKE14Z256VLL7

Question asked by Qinsheng Li on Oct 26, 2017
Latest reply on Oct 30, 2017 by Jing Pan

MKE14Z256VLL7 is used for our motor control board.

The crystal frequency is 4 MHz and LPFLL clock frequrncy is set to 72MHz.

The LPFLL clock is used for FlexTimer 0 (FTM0). The FTM0 is used for motor PWM control.

By testing we found that there are some LPFLL clock errors.

Three target boards are used for the test. The clock errors from 2 boards are negligible while the clock error from the 3rd one is about 0.8%.

Then the crystal is changed for the 3rd board but error is still the same.

What could be source of the clock error?