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Powering a UNI/O bus device through SCIO

Posted: 15 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:embedded system? UNI/O bus? SCIO? application note?

As embedded systems become smaller, a growing need exists to minimize I/O pin usage for communication between devices. Microchip has addressed this need by developing the UNI/O bus, a low-cost, easy-to-implement solution requiring only a single I/O pin for communication.

The standard configuration for a UNI/O bus combines the serial clock, data, address and control signals onto the SCIO signal. This allows UNI/O devices to enhance any application facing restrictions on available I/O stemming from connectors, board space, or the master device. But some applications can benefit from a further reduction in connections.

This application note describes how a standard halfwave rectifier and capacitor circuit can be added to allow power to be extracted parasitically from the SCIO signal. Guidance is offered for selecting the capacitor value and diode based on application parameters such as voltage and serial frequency. No modifications to the standard UNI/O bus protocol are necessary. It is assumed that the reader is already familiar with the basic terms and operation of the UNI/O bus.

View the PDF document for more information.

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