TDA8025 NXP Semiconductors, TDA8025 Datasheet - Page 15

• Manufacturer Part Number: TDA8025
• Description: IC card interface
• Manufacturer: NXP Semiconductors

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NXP Semiconductors
TDA8025_1
Product data sheet
The following sequence occurs when using an external clock connected to pin XTAL1 (see
Figure
1. external clock (XTAL1) started by the microcontroller (t0)
2. CMDVCCN is pulled LOW and the internal oscillator changes to its high frequency (t1)
3. V
Fig 8.
Fig 9.
CMDVCCN
XTAL
V
I/O
CLK
RSTIN
RST
I/OUC
OSCINT
CMDVCCN
XTAL
V
I/O
CLK
RSTIN
RST
I/OUC
OSCINT
CC
CC
CC
10):
rises either from 0 V to 3 V or 0 V to 1.8 V on a controlled slope (t2)
Activation sequence: CLK controlled by pin RSTIN with the crystal oscillator
Activation sequence: CLK not controlled by pin RSTIN with the crystal oscillator
low frequency
low frequency
t0
t0
t1 = t2
t1 = t2
Rev. 01 — 6 April 2009
t
t
d(start)
d(start)
t4
> 200 ns
t4
t
t
d(end)
d(end)
= t
= t
act
act
high frequency
high frequency
TDA8025
© NXP B.V. 2009. All rights reserved.
IC card interface
ATR
ATR
001aai965
001aai966
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