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ST25R3911B Datasheet(PDF) 9 Page - STMicroelectronics |
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ST25R3911B Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 116 page  Table 2. Low pass control rec1<5> lp2 rec1<4> lp1 rec1<3> lp0 -1 dB point 0 0 0 1200 kHz 0 0 1 600 kHz 0 1 0 300 kHz 1 0 0 2 MHz 1 0 1 7 MHz Others Not used 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. Table 3. Receiver filter selection and gain range rec1<5:3>lp<2:0> rec1<2>h200 rec1<1>h80 rec1<0>z12k 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) 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 settings, 3 dB steps, adjustment range from ±33 mV to ±120 mV). Adjustment of the digitizing window is included in the AGC and Squelch loops. In addition, the digitizing window can also be set manually in the Receiver configuration register 4. ST25R3911B Application information DS11793 - Rev 6 page 9/116 |
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