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| TDA8004AT Datasheet, PDF (11/22 Pages) NXP Semiconductors – IC card interface | |||
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Philips Semiconductors
IC card interface
Product speciï¬cation
TDA8004AT
PRES
OFF
CMDVCC
VCC
Deactivation caused by
cards withdrawal
Deactivation caused by
short circuit
FCE665
Fig.7 Behaviour of OFF, CMDVCC, PRES and VCC (see also application note AN97036 for software decision
algorithm on OFF signal).
OSC_INT/64
OFF
PRES
VCC
I/O
CLK
RST
tde
t10
t14
t13
high - Z
t12
t11
Fig.8 Emergency deactivation sequence.
FCE664
VCC regulator
The VCC buffer is able to deliver up to 65 mA continuously (at 5V if 5V/3V is HIGH or 3 V if 5V/3V is LOW). It has an
internal overload detection at approximately 90 mA.
This detection is internally filtered, allowing spurious current pulses up to 200 mA to be drawn by the card without causing
a deactivation (the average current value must stay below 65 mA).
For VCC accuracy reasons, a 100 nF capacitor with an ESR < 100 m⦠should be tied to CGND near pin 17, and a 100 nF
(or better 220 nF) with same ESR should be tied to CGND near to the C1 contact.
2004 May 10
11
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