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80023 Ver la hoja de datos (PDF) - Philips Electronics

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80023 IC card interface Philips
Philips Electronics Philips
80023 Datasheet PDF : 28 Pages
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Philips Semiconductors
IC card interface
Product specification
TDA8002
ACTIVATION SEQUENCE
From idle mode, the circuit enters the activation mode
when the microcontroller sets the CMDVCC line LOW or
sets the MODE line HIGH when the CMDVCC line is
already LOW. The internal circuitry is then activated, the
internal clock is activated and an activation sequence is
executed. When RST is enabled, it becomes the inverse of
RSTIN.
Figures 8 to 10 illustrate the activation sequence as
described below:
1. Step-up converter is started (t1 t0)
2. VCC rises from 0 to 5 V (t2 = t1 + 112T)
3. I/O, AUX1, AUX2 are enabled and CLK is enabled
(t3 = t1 + 4T); a special circuitry ensures that I/O
remains below VCC during falling slope of VCC
4. CLK is set by setting RSTIN to HIGH (t4)
5. RST is enabled (t5 = t1 + 7T); after t5, RSTIN has no
further action on CLK, but is only controlling RST.
handbook, full pagewidth
OSC_INT/64
CMDVCC
VUP
VCC
I/O
CLK
RSTIN
RST
tact
t0
t1
t2
t3
high - Z
t5
t4
T = 25 µs
Fig.8 Activation sequence using RSTIN and CMDVCC.
MGE736
1997 Nov 04
10
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