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80023 Ver la hoja de datos (PDF) - Philips Electronics

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80023 IC card interface Philips
Philips Electronics Philips
80023 Datasheet PDF : 28 Pages
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Philips Semiconductors
IC card interface
Product specification
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
handbook, full pagewidth
POWER
OFF
LOW-POWER
MODE
IDLE
MODE
ACTIVATION
FAULT
DEACTIVATION
ACTIVE
MODE
MGE735
1997 Nov 04
Fig.7 State diagram.
9
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