The DS1990R-F5# iButton provides a guaranteed unique ID in a small iButton® form, making it excellent for uses like a key in access control systems, inventory control applications, or work-in-progress tracking. However, there are many different uses for this iButton. Some of that we have seen include
- A key in a nursing home with many doors connected with a single 1-Wire bust using our LinkLocator to identify the door being accessed.
- A key to start carnival games so that user IDs may be tracked back to cash boxes, therefore eliminating theft.
- A guard tour device mounted on walls or other locations using the DS9093S iButton mount.
The DS1990R-F5#, unlike the DS1990A-F5#, guarantees that a presence pulse will be generated when the iButton® is placed against on a reader on a live 1-Wire bus. Other than that, the two iButtons® have the same functions.
If you have an application requiring a unique physical ID for a user or a location, please contact as to discuss how to use the DS1990R-F5#.
For more information on this product, please visit the DS1990R data sheet.