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TDA8024 bảng dữ liệu(PDF) 13 Page - List of Unclassifed Manufacturers

tên linh kiện TDA8024
Giải thích chi tiết về linh kiện  Three specifically protected half-duplex bidirectional buffered I/O lines to card contacts C4, C7 and C8
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TDA8024 bảng dữ liệu(HTML) 13 Page - List of Unclassifed Manufacturers

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2004 July 12
13
Philips Semiconductors
Product specification
IC card interface
TDA8024
8.7
Active mode
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 VPP (the voltage
required to program or erase the internal non-volatile
memory).
8.8
Deactivation sequence
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):
1. RST goes LOW (t10).
2. CLK is held LOW (t12 =t10 + 0.5 × T) where T is 64
times the period of the internal oscillator
(approximately 25
µs).
3. I/O, AUX1 and AUX2 are pulled LOW (t13 =t10 + T).
4. VCC starts to fall towards zero (t14 =t10 + 1.5 × T).
5. The deactivation sequence is complete at tde, when
VCC reaches its inactive state.
6. VUP falls to zero (t15 =t10 + 5T) and all card contacts
become low-impedance to GND; I/OUC, AUX1UC and
AUX2UC remain at VDD (pulled-up via a 11 kΩ
resistor).
7. The internal oscillator returns to its lower frequency.
handbook, full pagewidth
RST
CMDVCC
CLK
I/O
VUP
VCC
t15
t14
t13
t12
MDB056
tde
t10
Fig.9 Deactivation sequence.



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