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EM4450A5WW6E Datasheet(PDF) 9 Page - EM Microelectronic - MARIN SA |
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EM4450A5WW6E Datasheet(HTML) 9 Page - EM Microelectronic - MARIN SA |
9 / 16 page EM4450 EM4550 Copyright 2003, EM Microelectronic-Marin SA 9 www.emmicroelectronic.com After reception of the command, the address, and the data, the EM4450/4550 will check the parity, the write protection status, the Login status, and also if the available power from the RF field is sufficient. If all the conditions are satisfied, an acknowledge pattern (ACK) will be issued afterward and the EEPROM writing process will start. At the end of programming, the chip will send an Acknowledge pattern (ACK). If at least one of the checks fails, the chip will issue a no acknowledge pattern (NAK) instead of ACK and return to the Standard Read Mode. The Transceiver will keep the RF field permanently "ON" during the whole writing process time. The Read After Write function (bit 17 of Control word) controls the mode of operation following a write operation. When "ON" the latest written word will be read out and output next to the ACK pattern and two Listen Windows (LIW-LIW) even if the word is read protected. When "OFF", the ACK is followed immediately by a LIW-LIW and FWR. The last written word is not output. If a request from the transceiver to return in receive mode (RM) is generated during the LIW, another word can be written in. Otherwise, the EM4450/4550 will return in the Standard Read Mode. Fig. 16 WORD n LIW ACK LIW LIW FWR output input ACK t wa t wee TRANSCEIVER RF FIELD "ON" WORD n LIW output input RM WRITE WORD ADDRESS DATA ACK LIW ACK t wa t wee TRANSCEIVER RF FIELD "ON" Write 1 word Write severalwords RM WRITE WORD ADDRESS DATA RM WRITE WORD ADDRESS DATA WORD n LIW ACK LIW LIW Last Written LIW LIW FWR output input ACK t wa t wee TRANSCEIVER RF FIELD "ON" Read After Write function RM WRITE WORD ADDRESS DATA WORD n LIW NACK LIW LIW FWR output input t wa TRANSCEIVER RF FIELD "ON" Write not allowed or wrong transmission RM WRITE WORD ADDRESS DATA |
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