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ATA5282 Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATA5282 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 23 page 11 4694E–AUTO–08/05 ATA5282 3.9 Data Output The wake-up signal enables the data pin that delivers the received and demodulated data stream to the controller. Sampling and decoding has to be performed by the controller. An example for data coding is given in the “n Bit Data” field (Figure 3-7 on page 10). This kind of modulation requires an indication of the end of data, for example, by a burst that differs from the other transmitted bits. As the circuit does not check the received data (except the header), it is up to the base station which kind of modulation (pulse distance, Manchester, bi-phase...) is used. The data output signal is derived from the internal GAP detection. Table 3-1 describes how the timing depends on different conditions of the applied input signal. The Q-factor of the external LC-tank as well as the signal strength influence the pulse width of the output signal. Figure 3-8. Output Timing Conditions a c d b 50% 100% Internal NGAP Internal comporator output Coil input a + b = Data delay time t ON c + d = Data delay time t OFF Table 3-1. Typical Output Timing versus Signal Strength at 3.2V Supply Voltage Input Signal a, c (Figure 3-8) b (Periods) d (Periods) no Q Q ≤14 Q ≤20 no Q Q ≤14 Q ≤20 Minimum, 2.8 mV PP Depends on Q-factor 3 to 5 4 to 6 5 to 7 3 to 5 4 to 6 4 to 6 Medium, VCI < 2.8VPP 3 to 5 4 to 6 5 to 7 3 to 5 4 to 6 4 to 6 Strong, VCI ≥ 2.8VPP 3 to 5 3 to 5 3 to 5 3 to 5 4 to 6 4 to 6 |
Similar Part No. - ATA5282_05 |
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Similar Description - ATA5282_05 |
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