ST25R95 datasheet(37/61 Pages) STMICROELECTRONICS

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How to modify analog register configuration register (ARC_B) values

•

Use the ProtocolSelect command (

0x02) to select the correct communication protocol.

For example, to select the FeliCa™ protocol:

•

Send ProtocolSelect command:

•

ST25R95 reply

>>>

0x02020451

<<<

0x0000

•

Read the analog register configuration register (ARC_B) value.

•

Write the ARC_B register index at 0x01:

•

ST25R95 reply:

>>>

0x0903680001

<<<

0x0000

•

Read the ARC_B register value:

•

ST25R95 reply:

>>>

0x0803690100

<<<

0x00015F

In this example, the ARC_B register value is

0x5F, where “5” is the modulation index and “F” is the receiver gain.

•

Modify the Modulation Index and Receiver Gain values with 0x23.

•

Write the ARC_B register index:

•

ST25R95 reply:

>>>

0x090468010123

<<<

0x0000

•

Read the Analog Configuration register (ARC_B) value

•

Write the ARC_B register index at 0x01:

•

ST25R95 reply:

>>>

0x0903680001

<<<

0x0000

•

Read the ARC_B register value:

•

ST25R95 reply:

>>>

0x0803690100

<<<

0x000123

Modulation index and receiver gain values

Table 31. Possible modulation index values

Code

Modulation Index (1)

10%

17%

25%

30%

33%

36%

95%

1. Characterized only using ISO/IEC 10373 test set-up.

Table 32. Possible receiver gain values

Code

Receiver Gain (1)

34 dB

32 dB

27 dB

20 dB

8 dB

1. Characterized by design simulation.

ST25R95

Write Register (WrReg) command (0x09) description

DS12807 - Rev 4

page 37/61

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