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AN3955 Datasheet(PDF) 64 Page - STMicroelectronics

Part # AN3955
Description  This document describes
PDF  68 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3955 Datasheet(HTML) 64 Page - STMicroelectronics

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Doc ID 022017 Rev 1
7.4.2
Detect an ISO/IEC 14443-3 Type A tag function
The ISO14443A_IsPresent function is used to detect an ISO/IEC 14443-3 Type A
contactless tag.
The following table describes how the ISO14443A_IsPresent function detects an
ISO/IEC 14443-3 Type A contactless tag.
Figure 7 described how to detect an ISO/IEC 14443-3 Type A tag.
The name of the used function is User_Get14443Atag (main.c).
Figure 7.
Flowchart of User detects an ISO/IEC 14443-3 Type A tag
Table 101.
Detection of an ISO/IEC 14443-3 Type A contactless tag
Step
Action
1
The ISO14443A_IsPresent function configures the CR95HF to communicate with
an ISO/IEC 14443-3 Type A contactless tag.
2
If a tag has been detected, it selects the tag by using the Advanced function
ISO14443A_SelectSequence
.
3
It gets the UID. The user function is an Advanced function ISO14443A_GetUID.
MS19955V1
Start
END
Select 14443-3
type A protocol
Send A REQA
command
Select a tag
Get UID
Tag
response ?
No
Yes
Tag selected ?
Yes
No



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