My colleague who is developing hardware and I were finding out what we need in order to program the OTP in mass production. We're going to use a Murata module containing the DA14580 and external SPI flash. The OTP will contain the secondary bootloader.
Murata reference designs shows that P0_7 is used to enable Vpp via an external transistor when programming the OTP. They also say that any other GPIO-pin may be used in stead of P0_7.
However, we cannot find this automatic Vpp-control in Dialog's "AN-B-020_v1.3_End product testing and programming guidelines", it says the PC should enable Cpp (via an interface board).
Also, the SmartSnippets software doesn't have a setting for this pin? I didn't perform the actual OTP programming, only checked the GUI, so maybe the pin can be set later on in the procedure.
Does anybody know where we can find details of this feature?
And do we need to use it or is it preferred to let the PC enable Vpp as stated in AN-B-020 ?