tda8004at-c1 NXP Semiconductors, tda8004at-c1 Datasheet - Page 10

• Manufacturer Part Number: tda8004at-c1
• Description: Ic Card Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
TDA8004AT_3
Product data sheet
8.8 Deactivation sequence
8.9 Fault detection
With all these layout precautions, noise should be at an acceptable level, and jitter on C3
should be less than 100 ps. Refer to Application Note AN97036 for specimen layouts.
When a session is completed, the microcontroller sets the CMDVCC line to the HIGH
state. The circuit then executes an automatic deactivation sequence by counting the
sequencer back and ends in the inactive state (see
The following fault conditions are monitored by the circuit:
2. Have straight connection between CGND and C5 (the 2 capacitors on C1 should be
3. Avoid ground loops between CGND, PGND and GND
4. Decouple V
Fig 6. Deactivation sequence
•
•
•
•
•
•
•
•
OSC_INT/64
CMDVCC
connected to this ground track)
then they should be connected in star on the main track
RST goes LOW
CLK is stopped LOW
I/O, AUX1 and AUX2 are output into high-impedance state
pull-up resistor connected to V
V
V
VUP falls to zero
GND; I/OUC, AUX1UC and AUX2UC remain pulled up to V
Short-circuit or high current on V
Removing card during transaction
V
CC
CC
DD
VUP
RST
CLK
V
falls to zero
reaches its inactive state
dropping
I/O
CC
DDP
and V
Rev. 03 — 9 February 2006
(t
(t
(t
11
14
15
DD
= t
= t
= t
(t
separately; if the 2 supplies are the same in the application,
10
12
t
11
t
10
11
11
)
= t
+
+ 5T) and all card contacts become low-impedance to
t
12
CC
1
11
2
3T); the deactivation sequence is completed when
CC
)
+
t
13
1
2
high - Z
T); where T is approximately 25 s
t
14
t
de
Figure
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
6):
DD
TDA8004AT
(t
via a 10 k resistor
13
t
= t
15
IC card interface
11
+ T) (10 k
10 of 25
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