TDA8020HL 查看數據表（PDF） - Philips Electronics

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TDA8020HL

Dual smart card interface

Philips Electronics 

Philips Semiconductors

Dual smart card interface

Product specification

TDA8020HL

Deactivation sequence

When the session is completed, the microcontroller resets

bit START/STOP to logic 0 (t10). The circuit then executes

an automatic deactivation sequence (see Fig.5):

• Card reset (RST falls LOW) (t11)

• CLK is stopped (t12)

• I/O falls to 0 V (t13)

• VCC falls to 0 V with typical 0.14 V/µs slew rate (t14)

• The DC/DC converter is stopped (if both cards are

inactive) and CLK, RST, VCC and I/O become low

impedance to CGND (t15).

t11 = t10 + T/64; t12 = t11 + T/2; t13 = t11 + T;

t14 = t11 + 3T/2; t15 = t11 + 7T/2.

The deactivation time tde is the time that VCC needs to drop

below 0.4 V from START/STOP to logic 0 (t10).

handbook, full pagewidth

START/ STOP

RST

CLK

I/O

VCC

VUP

t de

t10 t11

t12

t13

t14

t15

Fig.5 Deactivation sequence.

FCE836

2001 Aug 15

11

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