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ST95HF Datasheet(PDF) 43 Page - STMicroelectronics |
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ST95HF Datasheet(HTML) 43 Page - STMicroelectronics |
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43 / 93 page  DocID025630 Rev 4 43/93 ST95HF Commands 92 5.11 Write Register (WrReg) command (0x09) description The Write Register (WRREG) command (0x09) is used to: • set the Analog Register Configuration address index value before reading or overwriting the Analog Register Configuration register (ARC_B) value • set the Analog Register Configuration register (ACC_A) value – Bits [7:6] are ST Reserved and must be set to ‘0’ – Bits [5:4] set the Demodulator Sensitivity (‘00’ = AM 10% or ‘10’ = AM 100%) – Bits [3:0] set the Load Modulation Index (‘0001’ = minimum load modulation, ‘0111’ = default value, ‘1111’ = maximum load modulation). The user can adjust this value to better fit his application. • set the Timer Window (TimerW) value used to improve ST95HF demodulation when communicating with ISO/IEC 14443 Type A tags • set the AutoDetect Filter used to help synchronization of ST95HF with ISO/IEC 18092 tags • configure the HF2RF bit(a) to manage ICC RF (VPS_TX) consumption in Ready state 5.11.1 Improving RF performance Adjusting the Modulation Index and Receiver Gain parameters in Reader mode or the Load Modulation Index and Demodulator Sensitivity parameters in Card Emulation mode helps improve application behavior. Modulation Index and Receiver Gain parameters for Reader mode The default values of these parameters (Table 35) are set by the PROTOCOLSELECT command, but they can be overwritten using the Write Register (WRREG) command (0x09). Table 31 and Table 32 list possible values for the Modulation Index and Receiver Gain parameters, respectively. This new configuration is valid until a new PROTOCOLSELECT or Write Register (of register ARC_B) command is executed. Register values are cleared at power off. a. When the HF2RF bit is ‘0’, Reader mode is possible (default mode). When set to ‘1’, VPS_TX power consumption is reduced (Ready mode). |
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