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PDIUSBD12 frequently asked questions

Posted: 01 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:PDIUSBD12 FAQ? ESD? power on reset circuit?

The PDIUSBD12 has a built-in Power-On Reset (POR) circuit. Typically, the RESET_N pin can directly be connected to VCC. In battery-powered applications such as PDAs and digital still cameras, the PDIUSBD12 is "always on" even when it is not in use. ESD, possibly caused by handling or storage, can cause the PDIUSBD12 to enter an indeterminate state. To avoid this, it is recommended that you use an external controlled sourcesuch as a microcontroller or microprocessorto provide reset to the PDIUSBD12, instead of directly connecting the PDIUSBD12 to VCC. An added advantage is that reset is easily done. For example, in a PDA, the PDIUSBD12 can be reset whenever data transfer is required through the USB using HotSync application.

The PDIUSBD12 is only used as a physical layer and a basic protocol layer interface. It complies with USB specification Rev. 2.0 (full-speed).

This application note contains frequently asked questions related to the PDIUSBD12.

View the PDF document for more information.

Click here to view related datasheets.

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