Adding USB to an existing product is not necessarily simple or elegant, and adding it to new projects adds a degree of complexity that may now be largely avoidable. Cypress Semiconductor's CY8C24794-24LFXI is the newest member of its popular PSoC Programmable System-on-Chip family of mixed-signal arrays. The 24794 includes a full-speed (12 Mbps) USB 2.0 Serial-Interface Engine (SIE),including a 0.25 percent accurate clock with an integrated oscillator that meets USB 2.0 clocking specifications and requires no external crystal,reducing component and pin counts. The device offers PSoC designers a complete USB interface, essentially for free.

The CY8C24794 provides four unidirectional endpoints and one bi-directional control endpoint to support control, interrupt, sochronous, and bulk transfer types, as well as flexible synchronization. It offers up to 48 analog inputs, so no external analog multiplexer is required for applications such as laptop touchpads using CapSense technology. This article describes the new PSoC, its USB interface and applications that can be easily designed using the device. To view more on this topic, click the download link above.