EM4444
Description
The EM4444 is used in passive UHF Read/Write transponder applications. It is powered up by an RF beam transmitted by the reader, which is received and rectified to generate a supply voltage for the chip. A pre-programmed ID code or other data is transmitted back to the reader by varying the amount of energy that is reflected back to the reader. It implements the robust and fast anti-collision protocol full pliant with the EM Microelectronic UHF read-only and read/write tags. Data is written to the tag in 64 bit blocks by manding the chip after its presence had been detected. ID only or ID and one or more EEPROM data pages is transmitted continuously in a Tag-Talks-Only (TTO) mode. Alternatively data can be read from the tag in 64 bit blocks by manding the chip after its presence had been detected. The reading range depends on the reader power allowed by local spectrum regulations, but in excess of 6 m can be achieved in the USA (license free) and 20 m (site licensed). More than 2 m can be attained in Europe. ID reading rates of 120 tags per second can be...
