ST ST23YR18 User Manual

ST23YR18

259a.ai

Micromodule Wafer

Dual contactless smartcard MCU with 18 Kbytes EEPROM,

enhanced security, cryptoprocessor and optimized RF performance

Data Brief

Features

Hardware features

■ Enhanced 8/16-bit ST23 CPU core with

16 Mbytes linear addressable memory

■ 230 Kbytes User ROM

■ 4 Kbytes User RAM

■ 2 Kbytes NESCRYPT RAM

■ 18 Kbytes User EEPROM including 128 Bytes

User OTP area:
– 30-year data retention at 25° C
– 500,000 Erase/Write cycles endurance

typical at 25° C

– 1 to 64 bytes Erase or Program in 2 ms

■ Enhanced NESCRYPT crypto-processor for

public key cryptography

■ Three 8-bit timers with watchdog and interrupt

capability

■ 3 V and 5 V supply voltage ranges

■ External clock frequency up to 10 MHz

■ High performance provided by:

– CPU clock frequency up to 29 MHz

■ Adjustable clocks for better granularity

■ Power-saving Standby state

■ Contact assignment compatible ISO 7816-3

■ Asynchronous receiver transmitter (IART) for

high speed serial data support (ISO 7816-3
and EMV™ compliant)

■ ESD protection greater then 6 kV (HBM) for

contact pads and 5 kV for contactless pads

Contactless features

■ Complies with ISO 14443 type B, Innovatron

(type B’) and PayPass™ standards

■ 13.56 MHz carrier frequency

■ RF frame up to 512 bytes

■ RFUART (RF universal asynchronous receiver

transmitter) up to 848 Kbits/s

■ 0.5 Kbytes dedicated RFUART RAM

■ BPSK - NRZ load modulation (card-to-reader)

■ 8 to 14% amplitude modulation reception

(reader to card) as minimum range

■ Enhanced RF performance provided by CPU

clock frequency up to 29 MHz coupled with
clock frequency divider

Security features

■ Active shield

■ Monitoring of environmental parameters

■ Protection mechanisms against faults

■ Hardware security enhanced DES accelerator

■ AIS-31 class P2 compliant true random

number generator (TRNG)

■ ISO 3309 CRC calculation block

■ Memory protection unit (MPU)

■ Unique serial number on each die

Development environment

Interface with RF readers supported through a
library of embedded software functions
compatible with ISO 14443 standard.

Software development and firmware generation
are supported by a comprehensive set of
development tools dedicated to software design
and validation:

■ C compiler, simulator and emulator

Applications

ST23YR18 major applications include:

■ EMVCo banking and transport

December 2008 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

1

Description ST23YR18

Ai15204

Internal Bus

2 I/Os

IART

GND

8/16-bit

CPU
Core

3 x

8-bit

Timers

CRC

Module

CLK

Clock

Gene-

rator

Module

Vcc

True

Random

Number

Gene-

rator

RAM

ST ROM

(Boot software)

Security
Monitor-

ing and
Control

RESET

EEPROM

EDES

Accelerator

User

ROM

ST ROM Firewall

NESCRYPT

NESCRYPT RAM

MPU

RF UART

RF

Inter-

face

AC0 AC1

RF UART

RAM

1 Description

The ST23YR18 product is a serial access microcontroller specially designed for secure
smartcard applications.

It is based on an enhanced STMicroelectronics 8/16-bit CPU core offering 16 Mbytes linear
addressing space. It is manufactured using an advanced highly reliable ST CMOS EEPROM
technology.

An RF Interface including an RF universal asynchronous receiver transmitter (RF UART)
enables contactless communication up to 848 Kbits/s compatible with the ISO 14443-B
standard and also enables Innovatron (type B’) communication.

Moreover, an ISO 7816-3 EMV-compliant asynchronous receiver transmitter (IART)
communication peripheral is available.

Figure 1. ST23YR18 block diagram

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