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EM4022V14WS11 Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA |
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EM4022V14WS11 Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA |
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7 / 15 page  Copyright 2002, EM Microelectronic-Marin SA 7 www.emmicroelectronic.com EM4022 MUTE and WAKE-UP timing diagrams Fig. 7 WAKE-UP An ACK sent after correct reception of a code is interpreted by the other transponders in the field as a WAKE-UP. The ACK arrives synchronously at the transponder that has just transmitted, but asynchronously at all the other transponders. If necessary, a WAKE-UP can also be sent if the code is not received correctly, ensuring that it will not be interpreted as an ACK by the transmitting transponder. This could speed up the protocol, but runs the risk of turning transponders off by accident. To detect a WAKE-UP, the chip checks for two GAPs, less than 7 bits apart and each less than seven bits wide. As with the MUTE allowance must made for the spread in clock frequencies. To be safely interpreted as a WAKE-UP, the GAPs should be sent less than 5 bits apart, and each should be less than 5 bits wide. This has an implication in the case of the high frequency ACK, which could theoretically consist of two very narrow GAPs 6 bits apart. In practice though, the GAPs will be typically at least one bit wide, making the separation five bits. Like the MUTE, the low frequency ACK GAPs should be at least 1.5 bits wide to serve as a reliable WAKE-UP. It should be noted that failure to reliably recognise WAKE-UPs is not critical. The protocol might be slowed down marginally, but will still work, as the chips time-out of the sleep mode automatically after 128 bits. |
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