If I am not using the external clock where should I tie the XCKLI pin?
ADUC7019
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The ADuC7019 / ADuC7020 / ADuC7021 / ADuC7022 / ADuC7024 / ADuC7025 / ADuC7026 / ADuC7027 / ADuC7028 / ADuC7029 are fully integrated,
1 MSPS, 12-bit data...
Datasheet
ADUC7019 on Analog.com
If I am not using the external clock where should I tie the XCKLI pin?
The XCKLI should be connected to GND if not used.
The XCKLI should be connected to GND if not used.