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V4070-PCB Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA |
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V4070-PCB Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA |
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5 / 9 page  V4070 5 EM MICROELECTRONIC-MARIN SA Standby Mode After a Power-On Reset and upon completion of a command, the chip will execute the Standby Mode, in which it will continuously send LIWs to allow the reader to issue commands. As every LIW has a duration of 160 periods of the RF field the reader can turn to Re- ceive mode every 1.3ms at 125kHz. Receive Mode To change from Standby Mode to another operation the chip has to be brought into Receive Mode. To do this the Transceiver sends to the chip the RM pattern during the 32 clocks of modulated phase in a Listen Window (LIW). The V4070 will stop sending data upon reception of a valid RM. The RM pattern consists of 2 bits “0” sent by the transceiver. The first “0” is to be detected during the 32 periods when the modulation is “ON” in the LIW. Next the V4070 expects a command to specify the operation to be executed. Commands The commands are composed of 4 bits, divided into 3 data bits and 1 even parity bit (total amount of “1’s” is even including the parity bit). There exist 4 different commands. Upon reception of an unknown command or a command with wrong parity the chip will immedi- ately return into Standby Mode. COMMAND BITS FUNCTION WRITE WORD 1 0 1 0 Parity bit First bit Recieved AUTHENTICATION 0 1 1 0 ID-MODE 0 0 1 1 UM-MODE 0 1 0 1 Commands Figure 7 UM-MODE In UM-MODE the chip sends LB1 and LB0 followed by the 30 Bits of UM starting with the MSB following the same procedure as in ID-MODE. After completion the chip returns to Standby Mode. Figure 6 ID Mode After reception of the command including the parity the chip sends a header consisting of 12 manchester coded ‘1’s followed by 4 manchester coded ‘0’s. Then the chip sends the 32 Bits of ID contained in words 3 and 2 of the EEPROM once, without parity, starting with the MSB of word 3. After completion the chip returns to Standby-Mode. Figure 5 OUTPUT Coded Data Data 1 bit - 32 T0 periods T0 = Period of RF carrier frequency D31-D t rID 11111111111100 Header LIW LIW Comman RM INPUT ID Mode Memory Map 0 UM 15 UM 0 Bit 31 Bit 0 word 9 Crypt Key 95 Crypt Key 80 7 Crypt Key 63 Crypt Key 48 6 Crypt Key 47 Crypt Key 32 5 Crypt Key 31 Crypt Key 16 8 Crypt Key 79 Crypt Key 64 4 Crypt Key 15 Crypt Key 0 Bit15 Bit0 3 ID 31 ID 16 2 ID 15 ID 0 1 LB1,LB0,UM 29 UM 16 |
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