AM62P-Q1: Clock Accuracy

This will depend on the frequency accuracy and frequency stability of the AM62P reference clock source across the -40 to +85 temperature range, that you select for your system design.

Your clock source would need to more accurate than 23.148 Parts Per Million (PPM) to achieve the goal of +/-2s per day. However, the clock source could vary as much as 196.76 PPM when operating at the -40 or +85 temperature extremes without violating the goal of +/-17s per day.

It may be a challenge to find a low-cost source that is able to achieve the initial frequency accuracy. If you find a clock source that is rated to operate from -40 to +85 with an initial accuracy better than 23 PPM, there is a good chance it will have a temperature variation that is better than you need to maintain the accuracy across the temperature range.

Regards,
Paul

The clocks inside AM62Px are derived from the reference clock connected to MCU_OSC0 and/or WKUP_LFOSC0. You must connect a 25MHz reference clock to MCU_OSC0. Connecting a 32.768kHz reference clock to WKUP_LFOSC0 is optional.

You should use clock tree tool provided in the SYSCONGIG tool to help develop a better understand the AM62Px clocking topology.

Regards,
Paul