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MCRF200ISN14D Datasheet(PDF) 8 Page - Microchip Technology |
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MCRF200ISN14D Datasheet(HTML) 8 Page - Microchip Technology |
8 / 24 page MCRF200 DS21219H-page 8 2003 Microchip Technology Inc. 3.0 MODES OF OPERATION The device has two basic modes of operation: Native mode and Read mode. 3.1 Native Mode Every unprogrammed blank device (CB12=0) operates in Native mode, regardless of configuration register settings: FCLK/128, FSK, NRZ_L (direct) Once the user memory is programmed, the lock bit is set (CB12=1) which causes the MCRF200 to switch from Native mode to the Communication mode defined by the configuration register. Refer to Figure 4-1 for contactless programming sequence. Also see the microID™ 125 kHz RFID System Design Guide (DS51115) for more information. 3.2 Read Mode After the device is programmed (CB12=1), the device is operated in the Read-only mode. The device transmits its data according to the protocol in the configuration register. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT Pad VB Pad VA Input capacitance: 2 pF RF Signal Data C To Reader amplifier/filter From Reader IAC L 2.5 mH 648 pF f res 1 2 π LC ------------------- 125 kHz == 125 kHz MCRF200 LC |
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