OTP twist lets users turn up the volume

Onetime-programmable (OTP) technology allows the wiper of a digital potentiometer to be permanently set by blowing a fuse link. But once the fuse has been blown, the wiper position can never be changed.
This limits the potentiometer’s usefulness for applications in which we want to adjust a level during operation but then have it reset to a factory standard on power-up. With audio presets, for example, the manufacturer may want the audio volume to power up to a predetermined safe listening level but then let the listener adjust the volume, which traditional OTP would not allow.