TDA8002ATSLASH5SLASHC2 datasheet(9/28 Pages) PHILIPS

9 / 28 page

1997 Nov 04

Philips Semiconductors

Product speciﬁcation

IC card interface

TDA8002

Logic circuitry

After power-up, the circuit has six possible states of

operation. Table 1 shows the sequence of these states.

IDLE MODE

After reset, the circuit enters the idle mode.

A minimum number of functions in the circuit are active

while waiting for the microcontroller to start a session:

• All card contacts are inactive

• I/OUC, AUX1UC and AUX2UC are high-impedance

• Oscillator XTAL runs, delivering CLKOUT

• Voltage supervisor is active.

LOW-POWER (SLEEP) MODE

When pin MODE goes LOW, the circuit enters the

low-power (sleep) mode. As long as pin MODE is LOW, no

activation is possible.

If pin MODE goes LOW in the active mode, a normal

deactivation sequence is performed before entering

low-power mode. When pin MODE goes HIGH, the circuit

enters normal operation after a delay of at least 6 ms

(96 cycles of CLKOUT). During this time the CLKOUT

remains at 16 kHz.

• All card contacts are inactive

• Oscillator XTAL does not run

• The VDD supervisor, ALARM output, card presence

detection and OFF output remain functional

• Internal oscillator is slowed to 32 kHz, CLKOUT

providing 16 kHz.

ACTIVE MODE

When the activation sequence is completed, the TDA8002

will be in the active mode. Data is exchanged between the

card and the microcontroller via the I/O lines.

State diagram

Fig.7 State diagram.

handbook, full pagewidth

MGE735

POWER

OFF

ACTIVE

MODE

LOW-POWER

MODE

IDLE

MODE

FAULT

ACTIVATION

DEACTIVATION

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