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PDF TDA8024 Data sheet ( Hoja de datos )
| Número de pieza | TDA8024 | |
| Descripción | IC card interface | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA8024
IC card interface
Product specification
Supersedes data of 2003 Aug 19
2004 July 12
1 page  
Philips Semiconductors
IC card interface
6 BLOCK DIAGRAM
Product specification
TDA8024
100 nF
100 nF
100 nF
VDD
21
VDD
SUPPLY
R1
PORADJ 18
(1)
INTERNAL
REFERENCE
R2 VOLTAGE SENSE
Vref
VDDP
6
S1
7
S2
5
DC/DC CONVERTER
INTERNAL OSCILLATOR
2.5 MHz
POWER_ON
EN1 CLKUP
OFF
RSTIN
CMDVCC
5V/3V
23
20
19
3
ALARM
CLKDIV1
CLKDIV2
1
2
HORSEQ
CLOCK
CIRCUITRY
EN2
PVCC
VCC
GENERATOR
EN5
SEQUENCER
EN4
RST
BUFFER
CLOCK
BUFFER
CLK
XTAL1
XTAL2
24
25 OSCILLATOR
EN3
THERMAL
PROTECTION
AUX1UC
27
AUX2UC
28
TDA8024
I/O
TRANSCEIVER
I/O
TRANSCEIVER
I/OUC
26
22
GND
I/O
TRANSCEIVER
4 PGND
8 VUP
100 nF
17 VCC
100 nF
14 CGND
16 RST
100 nF
15 CLK
10 PRES
9
PRES
13 AUX1
12 AUX2
11
I/O
mdb051
(1) Optional external resistor bridge. If this bridge is not required pin 18 should be connected to ground; see Section 8.2.2. Pin 18 is not connected
in the TDA8024AT.
Fig.1 Block diagram.
2004 July 12
5
5 Page 
Philips Semiconductors
IC card interface
Product specification
TDA8024
6
Vo
(V)
(1)
4
FCE661
12
Io
(mA)
(2)
8
24
00
0 20 40 60
t (ns)
(1) Current.
(2) Voltage.
Fig.6 I/O, AUX1 and AUX2 output voltage and
current as functions of time during a
LOW-to-HIGH transition.
8.5 Inactive mode
After a Power-on reset, the circuit enters the inactive
mode. A minimum number of circuits are active while
waiting for the microcontroller to start a session:
• All card contacts are inactive (approximately 200 Ω to
GND)
• Pins I/OUC, AUX1UC and AUX2UC are in the
high-impedance state (11 kΩ pull-up resistor to VDD)
• Voltage generators are stopped
• XTAL oscillator is running
• Voltage supervisor is active
• The internal oscillator is running at its low frequency.
8.6 Activation sequence
After power-on and after the internal pulse width delay, the
system microcontroller can check the presence of a card
using the signals OFF and CMDVCC as shown in Table 2.
Table 2 Card presence indication
OFF
HIGH
LOW
CMDVCC
HIGH
HIGH
INDICATION
card present
card not present
If the card is in the reader (this is the case if PRES or
PRES is active), the system microcontroller can start a
card session by pulling CMDVCC LOW. The following
sequence then occurs (see Fig.6):
1. CMDVCC is pulled LOW and the internal oscillator
changes to its high frequency (t0).
2. The voltage doubler is started (between t0 and t1).
3. VCC rises from 0 to 5 V (or 3 V) with a controlled slope
(t2 = t1 + 1.5 × T) where T is 64 times the period of the
internal oscillator (approximately 25 µs).
4. I/O, AUX1 and AUX2 are enabled (t3 = t1 + 4T) (these
were pulled LOW until this moment).
5. CLK is applied to the C3 contact of the card reader (t4).
6. RST is enabled (t5 = t1 + 7T).
The clock may be applied to the card using the following
sequence:
1. Set RSTIN HIGH.
2. Set CMDVCC LOW.
3. Reset RSTIN LOW between t3 and t5; CLK will start at
this moment.
4. RST remains LOW until t5, when RST is enabled to be
the copy of RSTIN.
5. After t5, RSTIN has no further affect on CLK; this
allows a precise count of CLK pulses before toggling
RST.
If the applied clock is not needed, then CMDVCC may be
set LOW with RSTIN LOW. In this case, CLK will start at t3
(minimum 200 ns after the transition on I/O), and after t5,
RSTIN may be set HIGH in order to obtain an Answer To
Request (ATR) from the card.
Activation should not be performed with RSTIN held
permanently HIGH.
2004 July 12
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet TDA8024.PDF ] | |
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