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ST95HF 데이터시트(PDF) 43 Page - STMicroelectronics

부품명 ST95HF
상세설명  Dedicated internal frame controller
PDF  93 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST95HF 데이터시트(HTML) 43 Page - STMicroelectronics

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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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