TDA8002CTSLASHA datasheet(14/28 Pages) PHILIPS

14 / 28 page

1999 Oct 12

Philips Semiconductors

Product speciﬁcation

IC card interface

TDA8002C

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 thus end

in the Idle mode.

Figures 13 and 14 illustrate the deactivation sequence as

follows:

1. RST goes LOW (t11 ≈ t10)

2. CLK is stopped (t12 =t11 + 1⁄2T)

3. I/O, AUX1 and AUX2 fall to zero (t13 =t11 +T)

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

ensures that I/O remains below VCC during the falling

slope of VCC

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

handbook, full pagewidth

FCE479

CMDVCC

VUP

OSC_INT/64

VCC

I/O

CLK

RSTIN

RST

LOW

tde

t10

t11

t12

t13

t14

t15

Fig.13 Deactivation sequence

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