TDA8034T Philips Semiconductors, TDA8034T Datasheet - Page 10

• Manufacturer Part Number: TDA8034T
• Description: Smart Card Interface
• Manufacturer: Philips Semiconductors

NXP Semiconductors
TDA8034T_TDA8034AT_1
Product data sheet
8.8 V
8.9 Fault detection
Remark: The value of period T is 64 times the period interval of the internal oscillator (i.e.
The V
The V
120 mA. This detection is internally filtered, enabling spurious current pulses up to
200 mA with a duration of a few milliseconds to be drawn by the card without causing
deactivation. However, the average current value must stay below maximum; see
The following conditions are monitored by the fault detection circuit:
Fault detection monitors two different situations:
Fig 7.
•
•
•
•
•
•
•
CC
25 s).
CMDVCC
Short-circuit or high current on pin V
Card removal during transaction
V
V
V
Overheating
Outside card sessions, pin CMDVCCN is HIGH: pin OFFN is LOW if the card is not in
the reader and HIGH if the card is in the reader. Any voltage drop on V
by the voltage supervisor. This generates an internal power-on reset pulse but does
not act upon the pin OFFN signal. The card is not powered-up and short-circuits or
overheating are not detected.
OSCINT
regulator
DDP
DD
DD(INTF)
CC
CC
XTAL1
RST
CLK
V
falling
I/O
buffer has an internal overload protection with a threshold value of approximately
CC
buffer is able to continuously deliver up to 65 mA at V
OSCINT = internal oscillator.
Deactivation sequence
falling
falling
t10 t11
Rev. 01 — 5 February 2010
high frequency
t12
t
deact
t13
TDA8034T; TDA8034AT
CC
t14
low frequency
CC
= 5 V or 3 V.
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Smart card interface
© NXP B.V. 2010. All rights reserved.
DD
is detected
001aak995
Table
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8.