TDA8002AT PHILIPS [NXP Semiconductors], TDA8002AT Datasheet - Page 9

• Manufacturer Part Number: TDA8002AT
• Description: IC card interface
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Logic circuitry
After power-up, the circuit has six possible states of
operation. Table 1 shows the sequence of these states.
I
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:
L
When pin MODE goes LOW, the circuit enters the
low-power (sleep) mode. As long as pin MODE is LOW, no
activation is possible.
State diagram
1997 Nov 04
DLE MODE
handbook, full pagewidth
OW
All card contacts are inactive
I/OUC, AUX1UC and AUX2UC are high-impedance
Oscillator XTAL runs, delivering CLKOUT
Voltage supervisor is active.
IC card interface
-
POWER
(
SLEEP
)
MODE
LOW-POWER
POWER
MODE
OFF
MODE
IDLE
Fig.7 State diagram.
DEACTIVATION
9
ACTIVATION
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.
A
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.
FAULT
CTIVE MODE
All card contacts are inactive
Oscillator XTAL does not run
The V
detection and OFF output remain functional
Internal oscillator is slowed to 32 kHz, CLKOUT
providing 16 kHz.
DD
supervisor, ALARM output, card presence
ACTIVE
MODE
MGE735
Product specification
TDA8002