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TDA8034AT 数据表(PDF) 6 Page - NXP Semiconductors

部件名 TDA8034AT
功能描述  Smart card interface
Download  29 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

TDA8034AT 数据表(HTML) 6 Page - NXP Semiconductors

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TDA8034T_TDA8034AT
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2.0. — 12 November 2010
6 of 29
NXP Semiconductors
TDA8034T; TDA8034AT
Smart card interface
The voltage supervisor monitors the voltage of the VDDP and VDD supplies providing both
Power-On Reset (POR) and supply drop-out detection during a card session. The
supervisor threshold voltages for VDDP and VDD are set internally. As long as VDD is less
than Vth + Vhys, the IC remains inactive irrespective of the command line levels. After VDD
has reached a level higher than Vth + Vhys, the IC remains inactive for the duration of tw.
The output of the supervisor is sent to a digital controller in order to reset the
TDA8034T/TDA8034AT. This defined reset pulse of approximately 8 ms, i.e. (tw = 1024 ×
1
fosc(int)low), is used internally to maintain the IC in the Shutdown mode during the supply
voltage power on; see Figure 4. A deactivation sequence is performed when either VDD or
VDDP falls below Vth.
Remark: fosc(int)low is the low frequency (or inactive) mode of the defined fosc(int)
parameter.
8.3 Clock circuits
The clock signal from pin CLK to the card is either supplied by an external clock signal
connected to pin XTAL1 or generated using a crystal connected between pins XTAL1 and
XTAL2. The TDA8034T/TDA8034AT automatically detects if an external clock is
connected to XTAL1, eliminating the need for a separate pin to select the clock source.
Automatic clock source detection is performed on each activation command (falling edge
of the signal on pin CMDVCCN). The presence of an external clock on pin XTAL1 is
checked during a time window defined by the internal oscillator. If a clock is detected, the
internal crystal oscillator is stopped. If a clock is not detected, the internal crystal oscillator
is started. When an external clock is used, it is mandatory that the clock is applied to pin
XTAL1 before the falling edge of the signal on pin CMDVCCN.
Fig 4.
Voltage supervisor waveforms
001aak993
tw
tw
power on
supply dropout
power off
Vth + Vhys
Vth
VDD
ALARMN
(internal signal)


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