ST25R95 datasheet(36/61 Pages) STMICROELECTRONICS

36 / 61 page

Load modulation index and demodulator sensitivity parameters for card emulation mode

The default value of these parameters (Table 35. ARC_B default code for available reader protocols) is set by the

ProtocolSelect command, but they can be overwritten using the Write Register (WrReg) command (0x09).

Table 33. Possible load modulation index values and Table 34. Possible demodulator sensitivity values list

possible values for the load modulation index and Demodulator Sensitivity parameters respectively.

This new configuration is valid until a new ProtocolSelect or Write Register (of register ACC_A) command is

executed. Register values are cleared at power off.

Table 30. WrReg command description (Load modulation index and demodulator sensitivity)

Direction

Data

Comments

Example

Host to

ST25R95

0x09

Command code

>>>0x0903680004

Set Analog Register Index to 0x04 (ACC_A) (1)

>>>0x090468010425

Update ACC_A to 0x25

0x03 or

0x04

Length of data

0x68

Analog Register Configuration address index

0x00 or

0x01

Flag Increment address or not after Write

command

0x04

Index pointing to the Demodulator Sensitivity

and Load Modulation values in ACC_A

RF performance

0xXX

New value for Demodulator Sensitivity and

Load Modulation

(see )Section 5.11.1 Improving RF

performance

ST25R95 to

Host

0x00

Result code

<<<0x0000

0x00

Length of data (=

RegCount)

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

0x0903680004).

ST25R95

Write Register (WrReg) command (0x09) description

DS12807 - Rev 4

page 36/61

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