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AN3275 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN3275
Description  Improving the performance of smartcard interfaces
Download  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3275 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN3275
2/32
Doc ID 17962 Rev 1
Contents
1
Activation/deactivation sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Card clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Emergency deactivation/fault detection . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
PORADJ VDD undervoltage without external resistor bridge . . . . . . . . . . . 9
3.2
PORADJ VDD undervoltage with external divider . . . . . . . . . . . . . . . . . . . 11
3.3
Fault on card removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4
VCC short-circuit fault protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5
VDDP drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.6
Overtemperature fault protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4
ST8024L application hardware guidelines . . . . . . . . . . . . . . . . . . . . . . 18
4.1
Power supply optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2
Clock section optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3
Smartcard connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4
Input and output connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31


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