AN3955 datasheet(65/68 Pages) STMICROELECTRONICS

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AN3955

Project example

Doc ID 022017 Rev 1

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7.4.3

Detect an ISO/IEC 14443-3 Type B tag function

The ISO14443B_IsPresent function is used in order to detect an ISO/IEC 14443-3 Type

B contactless tag. This function configures CR95HF to communicate with an ISO/IEC

14443-3 Type B contactless tag and sends an REQB command.

If a tag response is detected, the ISO14443B_IsPresent function returns RESULTOK.

Figure 8 describes how to detect an ISO/IEC 14443-3 Type B tag.

Figure 8.

Flowchart of User detects an ISO/IEC 14443-3 Type B tag

7.4.4

Detect an SRIX tag function

The SRIX4K_IsPresent function is used in order to detect an SRIX contactless tag. This

function configures CR95HF in order to communicate with an ISO/IEC 14443-3 Type B

contactless tag and sends an Initiate command.

The following table describes how the SRIX4K_IsPresent function detects an SRIX tag.

MS19956V1

Start

END

Select 14443-3

type B protocol

Send A REQB

command

Table 102.

Detection of an SRIX tag function

Step

Action

The SRIX4K_IsPresent function configures the CR95HF to communicate with an

ISO/IEC 14443-3 Type B contactless tag and sends an Initiate command.

If a tag has been detected, it returns RESULTOK.

It gets the UID by using the Advanced function SRIX4K_GetUIDadvanced.

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