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TDA8004 数据表(PDF) 9 Page - NXP Semiconductors

部件名 TDA8004
功能描述  IC card interface
Download  22 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TDA8004 数据表(HTML) 9 Page - NXP Semiconductors

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2004 May 10
9
Philips Semiconductors
Product specification
IC card interface
TDA8004AT
FCE662
OSC_INT/64
CMDVCC
VUP
VCC
I/O
CLK
RSTIN
RST
high - Z
tact
t0
t1
t2
t3
t4
t5
ATR
Fig.5 Activation sequence.
Active state
When the activation sequence is completed, the
TDA8004AT will be in the active state. Data is exchanged
between the card and the microcontroller via the I/O lines.
The TDA8004AT is designed for cards without VPP (this is
the voltage required to program or erase the internal
non-volatile memory).
Depending on the layout and on the application test
conditions (for example with an additional 1 pF cross
capacitance between C2/C3 and C2/C7) it is possible that
C2 is polluted with high frequency noise from C3. In this
case, it will be necessary to connect a 220 pF capacitor
between C2 and CGND
.
It is recommended to:
1. Keep track C3 as far as possible from other tracks
2. Have straight connection between CGND and C5 (the
2 capacitors on C1 should be connected to this ground
track)
3. Avoid ground loops between CGND, PGND and GND
4. Decouple VDDP and VDD separately; if the 2 supplies
are the same in the application, then they should be
connected in star on the main track.
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.
Deactivation sequence
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 Fig.6):
• RST goes LOW → (t11 =t10)
• CLK is stopped LOW → (t12 =t11 + 12T); where T is
approximately 25
µs
• I/O, AUX1 and AUX2 are output into high-impedance
state
→ (t13 =t11 + T) (10 kΩ pull-up resistor connected
to VCC)
• VCC falls to zero → (t14 =t11 + 123T); the deactivation
sequence is completed when VCC reaches its inactive
state
• VUP falls to zero → (t15 =t11 + 5T) and all card contacts
become low-impedance to GND; I/OUC, AUX1UC and
AUX2UC remain pulled up to VDD via a 10 kΩ resistor.


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