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ST25R95 数据表(PDF) 38 Page - STMicroelectronics

部件名 ST25R95
功能描述  Near field communication transceiver
PDF  61 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST25R95 数据表(HTML) 38 Page - STMicroelectronics

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How to modify analog register configuration register (ACC_A) values
•
Use the ProtocolSelect command (
0x02) to select the correct communication protocol.
For example, to select the ISO/IEC 14443-A card emulation protocol:
•
Send ProtocolSelect command:
•
ST25R95 reply
>>>
0x02021208
<<<
0x0000
•
Read the analog register configuration register (ACC_A) value.
•
Write the ACC_A register index at 0x04:
•
ST25R95 reply:
>>>
>>>0x0903680004
<<<
0x0000
•
Read the ACC_A register value:
•
ST25R95 reply:
>>>
0x0803690100
<<<
0x000127
In this example, the ACC_A register value is
0x27, where “2” is the demodulator sensitivity and “7” is the load
modulation index.
•
Modify the load modulation index values with 0x25.
•
Write the ARC_A register index:
•
ST25R95 reply:
>>>
0x090468010425
<<<
0x0000
•
Read the analog configuration register (ACC_A) value.
•
Write the ACC_A register index at 0x04:
•
ST25R95 reply:
>>>
0x0903680004
<<<
0x0000
•
Read the ARC_A register value:
•
ST25R95 reply: <<<
>>>
0x0803690100
<<<
0x000125
Load modulation index and demodulator sensitivity values
Table 33. Possible load modulation index values
Code (bits [3:0] of ACC_A register)
1
2
...
7
...
E
F
Load modulation index
Min.
-
-
Default
-
-
Max.
Table 34. Possible demodulator sensitivity values
Code (bits [5:4] of ACC_A register)
0x1
0x2
Demodulator Sensitivity (1)
10%
100%
1. Characterized by design simulation.
Note:
Bits [7:6] of ACC_A register are RFU and must set to ‘0’.
ST25R95
Write Register (WrReg) command (0x09) description
DS12807 - Rev 4
page 38/61



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