TDA8002CTSLASHB datasheet(12/28 Pages) PHILIPS

12 / 28 page

1999 Oct 12

Philips Semiconductors

Product speciﬁcation

IC card interface

TDA8002C

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 10 to 12 illustrate the activation sequence as

follows:

1. Step-up converter is started (t1 ≈ t0)

2. VCC rises from 0 to 3 or 5 V (t2 =t1 +11⁄2T) (according

to the state on pin CV/TV)

3. I/O, AUX1 and AUX2 are enabled and CLK is enabled

(t3 =t1 + 4T); I/O, AUX1 and AUX2 were forced LOW

until this time

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.

The value of VCC (5 or 3 V) must be selected by the level

on pin CV/TV before the activation sequence.

Fig.10 Activation sequence using RSTIN and CMDVCC.

handbook, full pagewidth

FCE273

OSC_INT/64

CMDVCC

VUP

VCC

I/O

CLK

RSTIN

RST

LOW

tact

T = 25

µs

TDA8002CT/B 데이터시트(PDF) 12 Page - NXP Semiconductors