AN3275 Datasheet, PDF(1/32 Page) STMicroelectronics – Improving the performance of smartcard interfaces

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AN3275 Datasheet, PDF (1/32 Pages) STMicroelectronics – Improving the performance of smartcard interfaces

AN3275

Application note

Improving the performance of smartcard interfaces

using the ST8024L

Introduction

The ST8024L is a smartcard interface offered as a drop-in replacement for the ST8024

device. Enhancements and changes to the ST8024L device include:

â Improved performance by reducing the noise sensitivity in the charge pump

â Incorporated 1.8 V VCC output

â Lower VTH threshold voltage

This application note provides information and suggestions for the optimal use and

performance of the ST8024L smartcard interface, including PCB layout, external component

placement, and connections (see ST8024L application hardware guidelines on page 18).

The implementation of all the blocks and procedures for card activation and deactivation

(see Figure 1) of the smartcard are also explained.

The ST8024L is a smartcard interface designed to minimize microprocessor hardware and

software complexity in all applications that require a smartcard (e.g., set-top box, electronic

payment, pay TV, and identification cards). The electrical characteristics of the ST8024L are

in accordance with New Digital Systems (NDS) and compliant with ISO7816-3, GSM11.11,

and EMV 4.0. Two devices (ST8024LCDR and ST8024LCTR) in the ST8024L family have

been certified by NDS.

Figure 1.

ST8024L internal block diagram

VDD

100nF

VDDP

100nF

C1â C1+

VDD

R1(1)

PORADJ/1.8V 18

R2(1)

OFF

RSTIN

CMDVCC

5V/3V

CLKDIV2(1)

CLKDIV2(2)

SUPPLY

INTERNAL

REFERENCE

Vref

VOLTAGE SENSE

STEP-UP CONVERTER

INTERNAL OSCILLATOR

2.5 MHz

ALARM

EN1 CLKUP

POWER_ON

EN2

VCC

PVCC GENERATOR

HORSEQ

CLOCK

CIRCUITRY

CLK

SEQUENCER

EN5 RST

BUFFER

EN4

CLOCK

BUFFER

XTAL1

XTAL2(2)

AUX1UC(2)

OSCILLATOR

ST8024L

AUX2UC(2)

I/OUC

GND

EN3

THERMAL

PROTECTION

I/O

TRANSCEIVER

I/O

TRANSCEIVER

I/O

TRANSCEIVER

4 PGND

8 VUP

100nF

17 VCC

100nF

CGND

RST

CLK

PRES

PRES(2)

AUX1(2)

AUX2(2)

I/O

CS18100

October 2010

Doc ID 17962 Rev 1

1/32

www.st.com

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