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ST95HF 数据表(PDF) 47 Page - STMicroelectronics |
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ST95HF 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 93 page  DocID025630 Rev 4 47/93 ST95HF Commands 92 Default code per protocol 5.11.2 Improving frame reception for ISO/IEC 14443 Type A tags To improve ST95HF demodulation when communicating with ISO/IEC 14443 Type A tags, it is possible to adjust the synchronization between digital and analog inputs by fine-tuning the Timer Window (TimerW) value. This can be done using the Write Register (WRREG) command to set a new TimerW value (min. 0x50, max. 0x60). The recommended value is 0x56 or 0x58 when using the ST95HF demo board. The default value of this parameter (0x52) is set by the PROTOCOLSELECT command, but it can be overwritten using the WRREG command (0x09). Table 35. ARC_B default code for available Reader protocols Communication protocol Default value Recommended values for ST95HF demo board Possible Modulation Index values (MS nibble) Possible Receiver Gain values (LS nibble) ISO/IEC 14443 Type A reader 0xDF 0xD7 0xD 0x0, 0x1, 0x3, 0x7 or 0xF ISO/IEC 14443 Type B reader 0x2F 0x37 0x1, 0x2, 0x3 or 0x4 0x0, 0x1, 0x3, 0x7 or 0xF ISO/IEC 18092 reader 0x5F 0x23 0x1, 0x2, 0x3 or 0x4 0x0, 0x1, 0x3, 0x7 or 0xF ISO/IEC 15693 reader 30% 0x53 0x53 0x4, 0x5 or 0x6 0x0, 0x1, 0x3, 0x7 or 0xF ISO/IEC 15693 reader 100% 0xD3 0xD3 0xD 0x0, 0x1, 0x3, 0x7 or 0xF Table 36. ACC_A default code for available Card Emulation protocols Communication protocol Default value Recommended values for ST95HF demo board Possible Demodulator Sensitivity values (MS nibble) Possible Load Modulation Index values (LS nibble) ISO/IEC 14443 Type A 0x27 0x27 0x2 From 0x1 to 0xF |
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