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ST25R3911B Datasheet(PDF) 19 Page - STMicroelectronics |
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ST25R3911B Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 129 page  DocID029656 Rev 2 19/129 ST25R3911B Functional overview 71 Table 3 provides information on the recommended filter settings. For all supported operation modes and receive bit rates there is an automatic preset defined, additionally some alternatives are listed. Automatic preset is done by sending direct command Analog Preset. There is no automatic preset for Stream and Transparent modes. Since the selection of the filter characteristics also modifies gain, the gain range for different filter settings is also listed. Digitizing stage The digitizing stage produces a digital representation of the sub-carrier signal coming from the receiver. This digital signal is then processed by the receiver framing logic. The digitizing stage consists of a window comparator with adjustable digitizing window (five possible Table 2. Low pass control rec1<5> lp2 rec1<4> lp1 rec1<3> lp0 -1 dB point 0 0 0 1200 kHz 001 600 kHz 011 300 kHz 100 2 MHz 101 7 MHz Others Not used Table 3. Receiver filter selection and gain range Gain (dB) Comments Max all Min1 Max23 Max1 Min23 Min all With boost 000 0 0 0 43.4 28.0 26.4 11.0 49.8 Automatic preset for ISO14443A fc/128 and NFC Forum Type 1 Tag 000 1 0 0 44.0 29.0 27.5 12.0 49.7 Automatic preset for ISO14443B fc/128 ISO14443 fc/64 001 1 0 0 44.3 29 27.0 11.7 49.8 Recommended for 424/484 kHz sub-carrier 000 0 1 0 41.1 25.8 23.6 8.3 46.8 Alternative choice for ISO14443 fc/32 and fc/16 100 0 1 0 32.0 17.0 17.2 2.0 37.6 Automatic preset for ISO14443 fc/32 and fc/16 Alternative choice for fc/8 (1.7 kb/s) 100 0 0 0 32.0 17.0 17.2 2.0 37.6 Alternative choice for fc/8 (1.7 kb/s) 000 0 1 1 41.1 25.8 23.6 8.3 46.8 Automatic preset FeliCa™ (fc/64, fc/32) Alternative choice for ISO14443 fc/32 and fc/16 101 0 1 0 30.0 20.0 12.0 2.0 34.0 Alternative choice for fc/8 and fc/4 101 1 0 0 30.0 20.0 12.0 2.0 34.0 Automatic preset for fc/8 and fc/4 000 1 0 1 36.5 21.5 24.9 9.9 41.5 Automatic preset for NFCIP-1 (initiator and target) |
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