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SRT512 Datasheet(PDF) 9 Page - STMicroelectronics |
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SRT512 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 46 page SRT512 Data transfer 9/46 3 Data transfer 3.1 Input data transfer from reader to SRT512 (request frame) The reader must generate a 13.56 MHz sinusoidal carrier frequency at its antenna, with enough energy to “remote-power” the memory. The energy received at the SRT512’s antenna is transformed into a supply voltage by a regulator, and into data bits by the ASK demodulator. For the SRT512 to decode correctly the information it receives, the reader must 10% amplitude-modulate the 13.56 MHz wave before sending it to the SRT512. This is represented in Figure 3. The data transfer rate is 106 Kbits/s. Figure 3. 10% ASK modulation of the received wave 3.1.1 Character transmission format for request frame The SRT512 transmits and receives data bytes as 10-bit characters, with the least significant bit (b0) transmitted first, as shown in Figure 4. Each bit duration, an ETU (elementary time unit), is equal to 9.44 µs (1/106 kHz). These characters, framed by a start of frame (SOF) and an end of frame (EOF), are put together to form a command frame as shown in Figure 10. A frame includes an SOF, commands, addresses, data, a CRC and an EOF as defined in the ISO 14443-3 Type B Standard. If an error is detected during data transfer, the SRT512 does not execute the command, but it does not generate an error frame. Figure 4. SRT512 request frame character format DATA BIT TO TRANSMIT TO THE 10% ASK MODULATION OF THE 13.56-MHz WAVE, GENERATED BY THE READER Transfer time for one data bit is 1/106 kHz SRT512 Ai13503b ai07664 1 ETU Start "0" Stop "1" MSb LSb Information Byte b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 |
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