STRFNFCA datasheet(41/74 Pages) STMICROELECTRONICS

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STRFNFCA

Commands

Doc ID 023077 Rev 10

41/74

5.11.3

Improving RF reception for ISO/IEC 18092 tags

To improve STRFNFCA reception when communicating with ISO/IEC 18092 tags, it is

possible to enable an AutoDetect filter to synchronize ISO/IEC 18092 tags with the

STRFNFCA. This can be done using the Write Register (WRREG) command to enable the

AutoDetect filter.

By default, this filter is disabled after the execution of the PROTOCOLSELECT command, but it

can be enabled using the WRREG command (0x09).

Table 29.

WRREG command description (Timer Window)

Direction

Data

Comments

Example

Host to

STRFNFCA

0x09

Command code

>>>0x09043A005804

Set recommended TimerW

value.

0x03

0x04

Length of data

0x3A

Timer Window (TimerW) value

0x00

0x01

Flag Increment address or not after Write

command

0xXX

Set TimerW value (recommended value is

0x56 or 0x58)

0x04

TimerW value confirmation

STRFNFCA

to Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

Table 30.

WRREG command description (AutoDetect Filter)

Direction

Data

Comments

Example

Host to

STRFNFCA

0x09

Command code

>>>0x09040A0102A1

Enable the AutoDetect filter.

0x03

0x04

Length of data

0x0A

AutoDetect filter control value

0x00

0x01

Flag Increment address or not after Write

command

0x02

AutoDetect filter enable

0xA1

AutoDetect filter confirmation

STRFNFCA

to Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

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