TDA8034T Philips Semiconductors, TDA8034T Datasheet - Page 9

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

NXP Semiconductors
TDA8034T_TDA8034AT_1
Product data sheet
8.7 Deactivation sequence
When a session ends, the microcontroller sets pin CMDVCCN HIGH. The
TDA8034T/TDA8034AT then executes an automatic deactivation sequence by counting
the sequencer back to the inactive state (see
Calculation of the time delays is as follows:
1. Pin RST is pulled LOW (t11).
2. The clock is stopped, pin CLK is LOW (t12).
3. Pin I/O is pulled LOW (t13).
4. V
5. V
6. All card contacts become low-impedance to GND. However, pin I/OUC remains pulled
7. The internal oscillator returns to its low frequency mode.
Fig 6.
•
•
•
•
•
CMDVCCN
XTAL
V
I/O
CLK
RSTIN
RST
I/OUC
OSCINT
inactive state.
up to V
t11 = t10 + 3T / 64
t12 = t11 + T / 2
t13 = t11 + T
t14 = t11 + 3T / 2
t
CC
deac
CC
CC
falls to 0 V (t14). The deactivation sequence is completed when V
< 0.4 V (t
= t11 + 3T / 2 + V
OSCINT = internal oscillator.
Activation sequence at t3
DD
low frequency
using the 11 k resistor.
t0
deac
t1 = t2
)
Rev. 01 — 5 February 2010
CC
t
d(start)
fall time
t4
> 200 ns
t
d(end)
TDA8034T; TDA8034AT
= t
act
Figure
high frequency
7) as follows:
www.DataSheet4U.com
Smart card interface
© NXP B.V. 2010. All rights reserved.
CC
ATR
reaches its
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