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AD7418: I2C interface and maximum conversion rate

We plan to use an AD7418 for temperature sensing. We don't wan to use any
CONVST pin, but we want to ask the temperature to your chip through I2C only,
at regular time period.
For this I2C only mode, without external CONVST pulse, how should we polarized
the CONVST input (pull-up to VDD or pull-down to GND)  ?

And for this mode, what will be the maximum conversion rate ?

 

When using the I^2C interface to activate conversion, you can tie the CONVST
either high or low( with high being the better option as the /CONVST is active
low). In mode 1 a conversion takes place every 400uS. For more information
refer to the datasheet section on operating modes.
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