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| TDA8002 Datasheet, PDF (12/28 Pages) NXP Semiconductors – IC card interface | |||
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Philips Semiconductors
IC card interface
Product speciï¬cation
TDA8002
DEACTIVATION SEQUENCE
When a session is completed, the microcontroller sets the
CMDVCC line to HIGH state or MODE line to LOW state.
The circuit then executes an automatic deactivation
sequence by counting the sequencer down and ends in
idle mode.
Figures 11 and 12 illustrate the deactivation sequence as
described below:
1. RST goes LOW (t11 â t10)
2. CLK is stopped (t12 = t11 + 1â2T)
3. I/O, AUX1, AUX2 are outputs into high-impedance
state (t13 = t11 + T)
4. VCC falls to zero (t14 = t11 + 11â2T); a special circuitry
ensures that I/O remains below VCC during falling
slope of VCC
5. VUP falls (t15 = t11 + 5T).
handbook, full pagewidth
OSC_INT/64
CMDVCC
VUP
VCC
I/O
CLK
RSTIN
RST
tde
t10
t15
t14
t13
high - Z
t12
t11
Fig.11 Deactivation sequence.
MGE739
1997 Nov 04
12
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