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ATA555814M01-PAE Datasheet(PDF) 3 Page - ATMEL Corporation |
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ATA555814M01-PAE Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 42 page  3 4681C–RFID–09/05 ATA5558 [Preliminary] 2.2 Power-On Reset (POR) and Initialization The Power-On-Reset circuit (POR) maintains the circuit in a reset state until an adequate inter- nal operating voltage threshold level has been reached, whereupon a default start-up delay sequence is started. During this period of 200 field clock cycles, the configuration and security setup is initialized from the System Configuration and Page Security blocks. 2.3 Control Logic The control logic is responsible for the following functions: • Initialization and reloading of the configuration from EEPROM • Control of read and write memory access operations • Data transmission and command decoding • CRC check, error detection and error handling 2.4 Modulator The modulator output circuitry controls the switching of a resistive load between the Coil 1 and Coil 2 pads to transmit data from the tag to the interrogator (uplink). The ASK load modulator is driven from the Manchester, Bi-phase encoder or directly from the EEPROM memory data stream (NRZ) according to the uplink encoding configuration. Figure 2-1. Manchester Timing Diagram Table 2-1. Types of Modulation Uplink Mode Manchester Encoding Bi-phase Encoding(1) NRZ – Direct Data ASK-coded modulation 0 = falling edge on mid bit 1 = rising edge on mid bit 0 = rising or falling edge 1 = no edge on mid bit 1 = modulation off 0 = modulation on Note: 1. Since Bi-phase encoding is data dependent the following definitions apply to the ATA5558 implementation. - The tag modulates the first (half) bit period after SOF. - If the last bit of a data stream is a logical 1 it is possible that this bit period is non-modu- lated and therefore is not detectable directly by the reader. 1 Data rate = F RF/16 0 01 NRZ data stream Manchester coded RF field Manchester coded Modulator signal |
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