The BF527 has an on-chip charge pump for VPP_OTP. How is this used? Does the VPP_OTP pin need to be disconnected from it's connection to 2.5V to use it? How is the charge pump programmed?
I have some boards that have VDD_OTP and VPP_OTP tied to 3.3V. The boards seem to boot and run fine. Is there a reliability issue with this? Should I be able to Read (but not write) OTP space?