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How to switch the DisplayPort hot-plug-detect signal with the MAX4928

Posted: 25 Sep 2009     Print Version  Bookmark and Share

Keywords:MAX4928s  DisplayPort switches  hot plug detect 

The MAX4928A/B are DisplayPort switches normally used to steer signals between PCIe and DisplayPort sources. The HPD (hot-plug-detect) signal coming from a DisplayPort monitor or DisplayPort panel is not compatible with either the controller hub or the MAX4928 switch. This application note explains that most DisplayPort switches have voltage level maxima that should not be exceeded and that a simple resistive divider cannot be used to meet logic levels for every application. The article presents a simple solution that adds a digital transistor as a logic-level shifter from LV-TTL to ~1V logic.

View the PDF document for more information.

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