ST95HF datasheet(45/93 Pages) STMICROELECTRONICS

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ST95HF

Commands

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 ISO/IEC 18092 protocol:

Send PROTOCOLSELECT command:

>>>0x02020451

ST95HF reply:

<<<0x0000

Read the Analog Register Configuration register (ARC_B) value.

Write the ARC_B register index at 0x01:

>>>0x0903680001

ST95HF reply:

<<<0x0000

Read the ARC_B register value:

>>>0x0803690100

ST95HF reply:

<<<0x015F

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:

>>>0x090468010123

ST95HF reply:

<<<0x0000

Read the Analog Configuration register (ARC_B) value.

Write the ARC_B register index at 0x01:

>>>0x0903680001

ST95HF reply:

<<<0x0000

Read the ARC_B register value:

>>>0x0803690100

ST95HF reply:

<<<0x0123

Modulation Index and Receiver Gain values

ST95HF to

Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

1. This command must be executed before reading the ACC_A register (0x0903680004).

Table 31. Possible Modulation Index values

Code

123

456

Modulation Index (1)

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

10%

17%

25%

30%

33%

36%

95%

Table 32. Possible Receiver Gain values

Code

Receiver Gain (1)

1. Characterized by design simulation.

34 dB

32 dB

27 dB

20 dB

8 dB

Table 30. WRREG command description (Load Modulation Index and Demodulator

Sensitivity) (continued)

Direction

Data

Comments

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