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AN3275 Datasheet(PDF) 7 Page - STMicroelectronics

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

AN3275 Datasheet(HTML) 7 Page - STMicroelectronics

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AN3275
Activation/deactivation sequence
Doc ID 17962 Rev 1
7/32
Figure 4.
Card activation/deactivation flowchart
Start
End
Error message
“No Card”
OFF pin = V
DD
Set CMDVcc
from high to low
Initiate activation
Charge pump is ON
Regulator is ON
I/O is enabled
CLK is active
Set RSTIN
from low to high
Start card
communication
Completed
Set CMDVcc
from low to high
Initiate deactivation
RST goes low
CLK is disabled
I/O is disabled
Regulator is OFF
Charge pump is OFF
End
Fault detection
OFF pin = GND
No
No
Yes
Alarm error message
“Error during
communication”
Initiate deactivation
RST goes high
CLK is disabled
I/O is disabled
Regulator is OFF
Charge pump is OFF
Set CMDVcc
from low to high
End
No alarm
AM04943v1



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