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EM4150A6WP27E Datasheet(PDF) 10 Page - EM Microelectronic - MARIN SA |
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EM4150A6WP27E Datasheet(HTML) 10 Page - EM Microelectronic - MARIN SA |
10 / 14 page R EM4150 EM4350 Communication from Transponder to the Transceiver ( READ MODE) The EM4150 modulates the amplitude of the RF field to transmit data to the transceiver. Data are output serially from the EEPROM and Manchester encoded. 1 bit 64 periods of RF field (Opt64) 32 periods of RF field (Opt32) Coded Data Measured on the COIL Data from EEPROM 32 periods (Opt64) 16 periods (Opt32) 1 bit 1 bit 1 bit Opt64 is the chip option with a bit period corresponding to 64 periods of the RF field Opt32 is the chip option with a bit period corresponding to 32 periods of the RF field Fig. 21 The EM4150 uses different patterns to send status information to the transceiver. Their structure can not be confused with a bit pattern sequence. These patterns are the Listen Window (LIW) to inform the transceiver that data can be accepted, the Acknowledge (ACK) indicating proper communication and end of EEPROM write, and the No Acknowledge (NAK) when something is wrong. The LIW, due to its special structure, can be used to synchronize the transceiver during a read operation. The LIW is sent before each word, and is sent twice before FWR. LIW ACK NAK All numbers represent number of periods of RF field 32 32 128 64 64 32 32 96 32 64 32 32 32 32 96 32 96 32 16 16 48 16 32 16 16 16 16 48 16 48 16 16 16 64 32 32 (Opt64) (Opt32) (Opt64) (Opt32) (Opt64) (Opt32) Opt64 is the chip option with a bit period corresponding to 64 periods of the RF field Opt32 is the chip option with a bit period corresponding to 32 periods of the RF field Fig. 22 Communication from the Transceiver to the Transponder (RECEIVE MODE) The EM4150 can be switched to the Receive Mode ONLY DURING A LISTEN WINDOW. The Transceiver is synchronized with the incoming data from the transponder and expects a LIW before each word. During the phase where the chip has its modulator "ON" (64/32 periods of RF [Opt64/Opt32] ), the transceiver has to send a bit "0". A certain phase shift in the read path of the transceiver can be accepted due to the fact that when entering Receive Mode, the Transceiver becomes the Master. At reception of the first "0", the chip immediately stops the LIW sequence and then expects another bit "0" to activate the receive mode. Once the EM4150 has received the first bit "0", the transceiver is imposing the timing for synchronisation. The EM4150 turns "ON" its modulator at the beginning of each frame of a bit period. To send a logic "1" bit, the transceiver continues to send clocks without modulation. After half a bit period, the modulation device of the EM4150 is turned "OFF" allowing recharge of the internal supply capacitor. To send a logic "0" bit, the transceiver stops sending clocks (100% modulation) during the first half of a bit period. The transceiver must not turn "OFF" the field after 7/4 clocks of the bit period (Opt64/Opt32). The field is stopped for the remaining first half of the bit period, and then turned "ON" again for the second half of the bit period. The 32rd/16th clock (Opt64/Opt32) defines the end of the bit To ensure synchronisation between the transceiver and the transponder, a logic bit set to "0" has to be transmitted at regular intervals. The RM pattern consists of two bits set to "0" thus allowing initial synchronisation. In addition, the chosen data structure contains even parity bits which will not allow more than eight consecutive bits set to logic "1" where no modulation occurs. Copyright © 2004, EM Microelectronic-Marin SA 10 www.emmicroelectronic.com |
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