TDA8024TT PHILIPS [NXP Semiconductors], TDA8024TT Datasheet - Page 13

• Manufacturer Part Number: TDA8024TT
• Description: IC card interface
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
8.7
When the activation sequence is completed, the TDA8024
will be in its active mode. Data is exchanged between the
card and the microcontroller via the I/O lines. The
TDA8024 is designed for cards without V
required to program or erase the internal non-volatile
memory).
8.8
When a session is completed, the microcontroller sets the
CMDVCC line HIGH. The circuit then executes an
automatic deactivation sequence by counting the
sequencer back and finishing in the inactive mode (see
Fig.9):
2004 July 12
handbook, full pagewidth
IC card interface
Active mode
Deactivation sequence
CMDVCC
V CC
RST
V UP
CLK
I/O
t 10
t 12
PP
t de
(the voltage
Fig.9 Deactivation sequence.
t 13
t 14
13
t 15
1. RST goes LOW (t
2. CLK is held LOW (t
3. I/O, AUX1 and AUX2 are pulled LOW (t
4. V
5. The deactivation sequence is complete at t
6. V
7. The internal oscillator returns to its lower frequency.
times the period of the internal oscillator
(approximately 25 s).
V
become low-impedance to GND; I/OUC, AUX1UC and
AUX2UC remain at V
resistor).
CC
CC
UP
starts to fall towards zero (t
reaches its inactive state.
falls to zero (t
10
15
12
).
= t
DD
= t
10
10
(pulled-up via a 11 k
+ 5T) and all card contacts
+ 0.5
MDB056
14
Product specification
= t
T) where T is 64
10
TDA8024
+ 1.5
13
= t
de
10
, when
T).
+ T).