ST8034AT datasheet(10/39 Pages) STMICROELECTRONICS

10 / 39 page

DocID024587 Rev 4

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ST8034T, ST8034AT, ST8034P, ST8034C

Pin description

Note:

Difference between the ST8034T and ST8034AT is the clock frequency division control, see

Table 13 on page 25.

Table 2. Pin description ST8034T and ST8034AT

Pin number

Symbol

Ref. supply

Function

1XTAL1

VDD

Crystal or external clock input

2XTAL2

VDD

Crystal connection (leave this pin open if external clock is

used)

3VDD(INTF)

Microcontroller interface supply voltage

4RSTIN

VDD(INTF)

Card reset input from microcontroller

5CMDVCC

VDD(INTF)

Start activation sequence input (from microcontroller,

active low)

6CLKDIV

VDD(INTF)

CLK frequency division control

7PRES

VDD(INTF)

Card presence input (active low: PRES low = card is

present). Debounced.

8I/O

VCC

Card input/output data line (C7); with internal 9 k



pull-up resistor to VCC.

GND

Ground

CLK

VCC

Clock to card (C3)

RST

VCC

Card reset, output (C2)

VCC

Supply voltage for the card, output (C1)

VDDP

LDO supply voltage input (for VCC generation)

VDD

Logic supply voltage input

OFF

VDD(INTF)

Interrupt to microcontroller (active low output, with

internal 20 k

 pull-up resistor to VDD(INTF))

I/OUC

VDD(INTF)

Microcontroller data I/O line (with internal 10 k

 pull-up

resistor connected to VDD(INTF))

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