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ST25R3916 数据表(PDF) 26 Page - STMicroelectronics |
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ST25R3916 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 157 page  Application information ST25R3916/7 26/157 DS12484 Rev 4 4.2.2 Receiver The receiver performs demodulation of the tag subcarrier modulation that is superimposed on the 13.56 MHz carrier frequency. It performs AM/PM or I/Q demodulation, amplification, band-pass filtering and digitalization of subcarrier signals. It also performs RSSI measurement, automatic gain control (AGC) and Squelch function. The reception chain has two separate channels for AM and PM demodulation. When both channels are active the selection for reception framing is done automatically by the receiver logic. The receiver is switched on when Operation control register bit rx_en is set to 1. The Operation control register contains bits rx_chn and rx_man, which define whether only one or both demodulation channels are active: bit rx_man defines the channel selection mode when both channels are active (automatic or manual) bit ch_sel defines which channel is used for decoding. Table 4. RX channel selection rx_chn rx_man ch_sel Selected reception channel 0 0 x Automatic selection 0 1 0 AM or I channel 0 1 1 PM or Q channel 1 x 0 AM or I channel 1 x 1 PM or Q channel |
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