TDA8002 Datasheet, PDF (13/28 Pages) NXP Semiconductors – IC card interface

Philips Semiconductors
IC card interface
Product specification
TDA8002
Fault detection
The following fault conditions are monitored by the circuit:
• Short-circuit or high current on V_CC
• Removing card during transaction
• V_DD dropping
• Overheating.
When one or more of these faults are detected, the circuit
pulls the interrupt line OFF to its active LOW state and a
deactivation sequence is initiated. In case the card is
present the interrupt line OFF is set to HIGH when the
microcontroller has reset the CMDVCC line HIGH (after
completion of the deactivation sequence). In case the card
is not present OFF remains LOW.
handbook, full pagewidth
OSC_INT/64
OFF
PRES
VCC
I/O
CLK
RST
tde
t10
t14
t13
high - Z
t12
t11
Fig.12 Emergency deactivation sequence.
MGE740
1997 Nov 04
13