ST7GEME4

Pin description

9/28

Figure 4.

Smartcard interface reference application - 24-pin SO package

1.

Mandatory values for the external components:

C1 = 4.7 µF; C2 = 100 nF. C1 and C2 must be located close to the chip (refer to Section 4.4.2.).

C3 = 1 nF;

C4 = 4.7 µF ESR 0.5

Ω.

C5 : 470 pF;

C6 : 100 pF;

R : 1.5k

Ω;

L1 : 10 µH, 2

Ω;

Crystal 4.0 MHz; Impedance max100

Ω

D1: BAT42 SHOTTKY.

23

2

GNDA

S

Ground

24

3

GND

S

1

4

CDRVCC

O

Smartcard supply pin

Table 2.

Pin description (continued)

Pin number

Pin name

Level

Port / Control

Main

function

(after reset)

Alternate function

Input

Output

LED0

DM

DP

USBVcc

OSCIN

OSCOUT

DIODE

CRDCLK

CRDRST

CRDVCC

PA6

CRDIO

C8

CRDDET

PA0

C4

GNDA

PA1

NC

GND

SELF

C4

C5

C6

L1

C3

D1

R

LED

C1

C2

D+

D-