ST25R95 datasheet(39/61 Pages) STMICROELECTRONICS

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Default code per protocol

Table 35. ARC_B default code for available reader protocols

Communication protocol

Default value

Possible modulation index

values (MS nibble)

Possible receiver gain values (LS nibble)

ISO/IEC 14443 Type A reader 0xDF

0xD

0x0, 0x1, 0x3, 0x7 or 0xF

ISO/IEC 14443 Type B reader 0x20

0x1, 0x2, 0x3 or 0x4

0x0, 0x1, 0x3, 0x7 or 0xF

FeliCa™ reader

0x50

0x1, 0x2, 0x3 or 0x4

0x0, 0x1, 0x3, 0x7 or 0xF

ISO/IEC 15693 reader 10%

0x53

0x4, 0x5 or 0x6

0x0, 0x1, 0x3, 0x7 or 0xF

ISO/IEC 15693 reader 100%

0xD3

0xD

0x0, 0x1, 0x3, 0x7 or 0xF

Table 36. ACC_A default code for available card emulation protocols

Communication protocol

Default

value

Recommended values

for ST25R95

demonstration board

Possible

Demodulator

sensitivity values

(MS nibble)

Possible load modulation

index values (LS nibble)

ISO/IEC 14443 Type A

0x27

0x2

From 0x1 to 0xF

5.11.2

Improving frame reception for ISO/IEC 14443 Type A tags

To improve ST25R95 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 ST25R95 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 37. WrReg command description (Timer Window)

Direction

Data

Comments

Example

Host to ST25R95

0x09

Command code

>>>

0x09043A005804

Set recommended TimerW value.

0x03 or 0x04 Length of data

0x3A

Timer Window (TimerW) value

0x00 or 0x01 Flag Increment address or not after Write command

0xXX

Set TimerW value (recommended value is 0x56 or

0x58)

0x04

TimerW value confirmation

ST25R95 to Host

0x00

Result code

<<<0x0000

0x00

Length of data

ST25R95

Write Register (WrReg) command (0x09) description

DS12807 - Rev 4

page 39/61

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