ST8024LACTR datasheet(8/35 Pages) STMICROELECTRONICS

8 / 35 page

Pin configuration

ST8024L

8/35

Doc ID 17709 Rev 5

AUX2

Auxiliary line to and from card (C8)

(internal 11 k

Ω pull-up resistor connected to VCC)

N. A.

AUX1

Auxiliary line to and from card (C4) (internal 11 k

Ω pull-up resistor to VCC)13

N. A

CGND

Ground for card signal (C5)

CLK

Clock to card (C3)

RST

Card reset (C2)

VCC

Supply voltage for the card (C1)

PORADJ

Power-on reset threshold adjustment input (ST8024LCDR, ST8024LCTR)

N. A.

1.8V

1.8 V VCC operation selection. Logic high selects 1.8 V operation and

overrides any setting on the 5V/3V pin. With an internal 11 k

Ω pull-down

resistor to GND. (ST8024LACDR, ST8024LACTR and ST8024LTR)

CMDVCC Start activation sequence input (active low)

RSTIN

Card reset input from MCU

VDD

Supply voltage

GND

Ground

OFF

Interrupt to MCU (active low)

XTAL1

Crystal or external clock input

XTAL2

Crystal connection (leave this pin open if external clock is used)

N.A

I/OUC

MCU data I/O line (internal 11 k

Ω pull-up resistor connected to VDD)26

AUX1UC

Non-inverting receiver input (internal 11 k

Ω pull-up resistor connected to VDD)27

N. A.

AUX2UC

Non-inverting receiver input (internal 11 k

Ω pull-up resistor connected to VDD)28

N. A.

Table 2.

Pin description (continued)

Symbol

Name and function

SO-28/

TSSOP-28

TSSOP-20

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