Philips TDA8002C Manual do Utilizador descarregar pdf (Página 15)

1999 Oct 12 15

Philips Semiconductors Product speciﬁcation

IC card interface TDA8002C

Fault detection

The following fault conditions are monitored by the circuit:

• Short-circuit or high current on V

• Removing card during transaction

• V

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 the event that the

card is present the interrupt line OFF is set to HIGH state

when the microcontroller has reset the CMDVCC line

HIGH (after completion of the deactivation sequence).

In the event that the card is not present OFF remains

LOW.

handbook, full pagewidth

FCE480

I/O

CLK

RST

LOW

OFF

PRES

OSC_INT/64

Fig.14 Emergency deactivation sequence.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 27 28

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Philips TDA8002C Manual do Utilizador Página 15