SPRSP69B July 2023 – November 2023 TMS320F28P650DK , TMS320F28P659DK-Q1
PRODMIX
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It is recommended that the user have the crystal manufacturer completely characterize the crystal with their board to ensure the crystal always starts up and maintains oscillation.
Below is a brief overview of some measurements that can be performed:
Due to how sensitive the crystal circuit is to capacitance, it is recommended that scope probes not be connected to X1 and X2. If scope probes must be used to monitor X1/X2, an active probe with less than 1-pF input capacitance should be used.
Frequency
Negative Resistance
Start-Up Time