External Clock Crystal and Circuitry

Versal ACAP Technical Reference Manual (AM011)

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1.4 English

The typical crystal used for the RTC is a 20 ppm, 32.768 kHz crystal (see the following figure). Using the RTC calibration mechanism, the effective inaccuracy is reduced to less than two. Using a 65.536 kHz crystal further reduces the effective calibration inaccuracy to less than 1 ppm.

Figure 1. Crystal Circuit Example