ST8034AT datasheet(11/39 Pages) STMICROELECTRONICS

11 / 39 page

Pin description

ST8034T, ST8034AT, ST8034P, ST8034C

12/40

DocID024587 Rev 4

Table 3. Pin description ST8034P and ST8034C

Pin number

Symbol

Ref. supply

Function

1VDD(INTF)

Microcontroller interface supply voltage (input)

2RSTIN

VDD(INTF)

Card reset input from microcontroller

3CS

VDD(INTF)

Chip select input. CS = high => device is active, low =>

all microcontroller interface pins set to high impedance.

(ST8034C)

VCC_SEL

VDD(INTF)

VCC (card supply) selection input: logic high selects

VCC = 5 V, logic low selects VCC = 3 V, left-floating

selects VCC = 1.8 V. (ST8034P)

4CMDVCC

VDD(INTF)

Start activation sequence input (from microcontroller,

active low)

5PRES

VDD(INTF)

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

present). Debounced.

6I/O

VCC

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



pull-up resistor to VCC

GND

Ground

8CLK

VCC

Clock to card (C3)

9RST

VCC

Card reset, output (C2)

VCC

Supply voltage for the card, output (C1)

VDDP

LDO supply voltage input (for VCC generation)

VDD

Control logic supply voltage input

PORADJ

VDD(INTF)

Power-on reset threshold adjustment 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))

CLKIN

VDD(INTF)

External clock input

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