TDA8034T(2010) データシートの表示（PDF） - NXP Semiconductors.
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TDA8034T Datasheet PDF : 29 Pages
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NXP Semiconductors
TDA8034T; TDA8034AT
Smart card interface
Remark: The value of period T is 64 times the period interval of the internal oscillator (i.e.
± 25 μs).
CMDVCC
RST
CLK
I/O
VCC
XTAL1
OSCINT
high frequency
t10 t11
t12
t13 t14
tdeact
OSCINT = internal oscillator.
Fig 7. Deactivation sequence
low frequency
001aak995
8.8 VCC regulator
The VCC buffer is able to continuously deliver up to 65 mA at VCC = 5 V or 3 V.
The VCC buffer has an internal overload protection with a threshold value of approximately
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 Table 8.
8.9 Fault detection
The following conditions are monitored by the fault detection circuit:
• Short-circuit or high current on pin VCC
• Card removal during transaction
• VDDP falling
• VDD falling
• VDD(INTF) falling
• Overheating
Fault detection monitors two different situations:
• 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 VDD is detected
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.
TDA8034T_TDA8034AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.0. — 12 November 2010
© NXP B.V. 2010. All rights reserved.
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