STRFNFCA datasheet(40/74 Pages) STMICROELECTRONICS

40 / 74 page

Commands

STRFNFCA

40/74

Doc ID 023077 Rev 10

Read the Analog Configuration register (ARC_B) value.

Write the ARC_B register index at 0x01:

>>>0x0903680001

STRFNFCA reply:

<<<0x0000

Read the ARC_B register value:

>>>0x0803690100

STRFNFCA reply:

<<<0x0123

Modulation Index and Receiver Gain values

Default code per protocol

5.11.2

Improving frame reception for ISO/IEC 14443 Type A tags

To improve STRFNFCA demodulation when communicating with ISO/IEC 14443 Type A

tags, it is possible to adjust the synchronization between digital and analog inputs by fine-

tuning the Timer Window (TimerW) value. This can be done using the Write Register

(WRREG) command to set a new TimerW value (min. 0x50, max. 0x60). The recommended

value is 0x56 or 0x58 when using the STRFNFCA demo board.

The default value of this parameter (0x52) is set by the PROTOCOLSELECT command, but it can

be overwritten using the WRREG command (0x09).

Table 26.

Possible Modulation Index values

Code

123

456

Modulation Index (1)

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

10%

17%

25%

30%

33%

36%

95%

Table 27.

Possible Receiver Gain values

Code

Receiver Gain (1)

Characterized by design simulation.

34 dB

32 dB

27 dB

20 dB

8 dB

Table 28.

Default code for available reader protocols

Communication

protocol

Default value

Recommended

values for

STRFNFCA

demo board

Possible

Modulation

Index values

(MS nibble)

Possible

Receiver Gain

values (LS

nibble)

ISO/IEC 14443 Type A

reader

0xDF

0xD7

0xD

0x0, 0x1, 0x3,

0x7 or 0xF

ISO/IEC 14443 Type B

reader

0x2F

0x37

0x1, 0x2, 0x3 or

0x4

0x0, 0x1, 0x3,

0x7 or 0xF

ISO/IEC 18092reader

0x5F

0x23

0x1, 0x2, 0x3 or

0x4

0x0, 0x1, 0x3,

0x7 or 0xF

ISO/IEC 15693 reader

30%

0x53

0x4, 0x5 or 0x6

0x0, 0x1, 0x3,

0x7 or 0xF

ISO/IEC 15693 reader

100%

0xD3

0xD

0x0, 0x1, 0x3,

0x7 or 0xF

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