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Philips Semiconductors
IC card interface
D
EACTIVATION SEQUENCE
When a session is completed, the microcontroller sets the
CMDVCC line to HIGH state or MODE line to LOW state.
The circuit then executes an automatic deactivation
sequence by counting the sequencer down and thus end
in the Idle mode.
Figures 13 and 14 illustrate the deactivation sequence as
follows:
handbook, full pagewidth
OSC_INT/64
CMDVCC
VUP
V CC
I/O
CLK
RSTIN
RST
1999 Oct 12
1. RST goes LOW (t
2. CLK is stopped (t
3. I/O, AUX1 and AUX2 fall to zero (t
4. V
ensures that I/O remains below V
slope of V
5. VUP falls (t
t de
t 10
t 14
t 13
LOW
t 12
t 11
Fig.13 Deactivation sequence
14
t
11
10
= t
12
11
falls to zero (t
= t
CC
14
11
CC
= t
+ 5T).
15
11
t 15
Product specification
TDA8002C
)
1
+
T)
2
= t
+ T)
13
11
1
+ 1
T); a special circuit
2
during the falling
CC
FCE479
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