TDA8002ATSLASH3 datasheet(12/28 Pages) PHILIPS

12 / 28 page

1997 Nov 04

Philips Semiconductors

Product speciﬁcation

IC card interface

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 ≈ t10)

2. CLK is stopped (t12 =t11 + 1⁄2T)

3. I/O, AUX1, AUX2 are outputs into high-impedance

state (t13 =t11 +T)

4. VCC falls to zero (t14 =t11 +11⁄2T); a special circuitry

ensures that I/O remains below VCC during falling

slope of VCC

5. VUP falls (t15 =t11 + 5T).

Fig.11 Deactivation sequence.

handbook, full pagewidth

MGE739

CMDVCC

VUP

OSC_INT/64

VCC

I/O

CLK

RSTIN

RST

high - Z

tde

t10

t11

t12

t13

t14

t15

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