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| AN3275 Datasheet, PDF (7/32 Pages) STMicroelectronics – Improving the performance of smartcard interfaces | |||
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AN3275
Activation/deactivation sequence
Figure 4. Card activation/deactivation flowchart
Start
No
OFF pin = VDD
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
Error message
âNo Cardâ
End
Fault detection
OFF pin = GND
Yes
Alarm error message
âError during
communicationâ
No
No alarm
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
AM04943v1
Doc ID 17962 Rev 1
7/32
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