RX95HF datasheet(23/44 Pages) STMICROELECTRONICS

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RX95HF

Commands

Note:

The Management of the Analog Register Configuration register (ACC_A) is described in

Section 5.10: Write Register (WrReg) command (0x09) description.

5.10

Write Register (WrReg) command (0x09) description

The Write Register (WRREG) command (0x09) is used to:



set the Analog Register Configuration address index value before reading or

overwriting the Analog Register Configuration register (ACC_A) value



set the Analog Register Configuration register (ACC_A) value

–

Bits [7:6] are ST Reserved and must be set to ‘0’

–

Bits [5:4] set the Demodulator Sensitivity (‘00’ = AM 10% or ‘10’ = AM 100%)

–

Bits [3:0] set the Load Modulation Index (‘0001’ = minimum load modulation, ‘0111’

= default value, ‘1111’ = maximum load modulation). The user can adjust this value

to better fit his application.

5.10.1

Improving RF performance

Adjusting the Load Modulation Index and Demodulator Sensitivity parameters in Card

Emulation mode helps improve application behavior.

The default value of these parameters (Table 21) is set by the PROTOCOLSELECT command,

but they can be overwritten using the Write Register (WRREG) command (0x09). Table 22

and Table 23 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 21. WRREG command description (Load Modulation Index and Demodulator

Sensitivity)

Direction

Data

Comments

Example

Host to

RX95HF

0x09

Command code

>>>0x0903680004

Set Analog Register Index to

0x04 (ACC_A) (1)

>>>0x090468010425

Update ACC_A to 0x25

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

0x03

0x04

Length of data

0x68

Analog Register Configuration address

index

0x00

0x01

Flag Increment address or not after Write

command

0x04

Index pointing to the Demodulator

Sensitivity and Load Modulation values in

ACC_A register (0x04) (See

Section 5.10.1)

0xXX

New value for Demodulator Sensitivity and

Load Modulation (See Section 5.10.1)

RX95HF to

Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

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