I don't intend to use OTP memory at all. Do I need to provide the 2.5V to VDDOTP and VPPOTP? If so, why?
Yes, VDDOTP and VPPOTP must be powered. Factory settings are stored in OTP memory and unpredicatable behavior can occur if the supplies aren't powered according to the data sheet specifications.
Is that necessary to follow the power circuitry for OTP provided in BF526 Ezkit schematic? If we are not using the OTP memory, is that enough to give a 2.5V for the VPPOTP pin?
As long as you don't need to write to OTP memory it is fine to supply VDDOTP and VPPOTP with 2.5V. The circuit on the EZ-Kit is for people who want to write to OTP memory.
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