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EM4550A5WW7E Datasheet(PDF) 4 Page - EM Microelectronic - MARIN SA |
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EM4550A5WW7E Datasheet(HTML) 4 Page - EM Microelectronic - MARIN SA |
4 / 16 page EM4450 EM4550 Copyright 2003, EM Microelectronic-Marin SA 4 www.emmicroelectronic.com Timing Characteristics VDD =2.5V, VSS=0V , fcoil = 125 kHz Sine wave, Vcoil = 1Vpp , Top = 25°C unless otherwise specified All timings are derived from the field frequency and are specified as a number of RF periods.. Parameter Symbol Conditions Value Unit Option : 64 clocks per bit Opt64 Read Bit Period trdb 64 RF periods LIW/ACK/NACK pattern duration tpatt 320 RF periods Read 1 Word Duration trdw including LIW 3200 RF periods Processing Pause Time tpp 64 RF periods Write Access Time twa 64 RF periods Initialization Time tinit 2112 RF periods EEPROM write time twee VDD = 3V 3200 RF periods Option : 32 clocks per bit Opt32 Read Bit Period trdb 32 RF periods LIW/ACK/NACK pattern duration tpatt 160 RF periods Read 1 Word Duration trdw including LIW 1600 RF periods Processing Pause Time tpp 32 RF periods Write Access Time twa 32 RF periods Initialization Time tinit 1056 RF periods EEPROM write time twee VDD = 3V 2624 RF periods RF periods represent periods of the carrier frequency emitted by the transceiver unit. For example, if 125 kHz is used : The Read bit period (Opt64) would be : 1/125'000*64 = 512 µs, and the time to read 1 word : 1/125'000*3200 = 25.6 ms. The Read bit period (Opt32) would be : 1/125'000*32 = 256 µs, and the time to read 1 word : 1/125'000*1600 = 12.8 ms. ATTENTION Due to amplitude modulation of the coil-signal, the clock-extractor may miss clocks or add spurious clocks close to the edges of the RF-envelope. This desynchronisation will not be larger than ±3 clocks per bit and must be taken into account when developing reader software. Functional Description General The EM4450/4550 is supplied by means of an electromagnetic field induced on the attached coil. The AC voltage is rectified in order to provide a DC internal supply voltage. When the DC voltage crosses the Power-On level, the chip enters the Standard Read Mode and sends data continuously. The data to be sent in this mode is user defined by storing the first and last addresses to be output. When the last address is sent, the chip will continue with the first address until the transceiver sends a request. In the read mode, a Listen Window (LIW) is generated before each word. During this time, the EM4450/4550 will turn to the Receive Mode (RM) if it receives a valid RM pattern. The chip then expects a valid command. Mode of Operation Fig. 4 Get Command Standard Read Mode Send w ord Pow er-On Write Word Write Password Selective Read Login YES NO Receive Mode request ? Reset Execute Command Init |
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