Features
ST21NFCA
Near field communication microcontroller
Data Brief
ST21NFCA operating modes supported:
■ Card emulation
■ Reader
■ Peer-to-peer communication
Hardware features
■ Enhanced 8/16-bit CPU core with 16 Mbytes
linear addressable memory
■ 112 Kbytes of User ROM
■ 4 Kbytes of RAM
■ 36 Kbytes of EEPROM including 64 bytes User
OTP area
■ High integrated analog front end (AFE) for RF
transmission and reception including automatic
card and field detection modes
■ Three 8-bit timers with interrupt capability
■ Battery Off and Battery Low modes supported
in Card Emulation mode
■ Optimized power consumption modes
■ SIM and ST21NFCA power management
functions
RF communications
■ ISO/IEC 14443 A&B
■ ISO/IEC 15693
■ ISO/IEC 18000-3 Mod1
■ ECMA340 (NFCIP-1)
■ Supports FeliCa™ cards as described in
ECMA340 specification
■ All RF communications are available in card
and reader modes
VFQFPN32
Security features
■ True random number generator
■ ISO/IEC 3309 CRC calculation block
■ Unique serial number on each die
■ Hardware DES accelerator
Electrical characteristics
■ Standby current: < 75 µA (typ.)
■ Card emulation: < 8 mA in normal mode
■ Standby current for Reader mode: ~200 µA in
Card Detection mode
■ Reader mode: < 70 mA (typ.)
■ 3V power supply
■ Supports Class B and C for UICC
Software features
■ Includes all drivers supporting the handling and
host protocols for contact and contactless
interfaces
■ Includes complete firmware driving switch
modes between operating modes and host
controller interface functions (HCI)
Validation tools
An evaluation and debugging board is available
for complete integration.
Communication interfaces
■ Single Wire Protocol (SWP) interface
2
■ I
C Slave interface
■ SPI Slave interface
■ Asynchronous receiver transmitter ISO/IEC
7816-3 master interface supporting T=0 and
T=1 protocols
February 2008 Rev 1 1/6
For further information contact your local STMicroelectronics sales office.
www.st.com
6
Description ST21NFCA
1 Description
The ST21NFCA is a single chip designed for supporting 13.56 MHz contactless
communication, including Near Field Communication (NFC) functions in the three operating
modes: card emulation, reader and peer-to-peer communication.
The ST21NFCA is designed for an optimized integration on a mobile phone with the
communication links shown in Figure 1.
Figure 1. Mobile phone communication links
This product is based on an advanced Smartcard ST21 microcontroller with 36 Kbytes of
EEPROM, 112 Kbytes of User ROM and 4 Kbytes of RAM and includes an integrated RF
Analog Front End (AFE) supporting all the contactless proximity (ISO/IEC 14443, Calypso
V1 Radio Protocol (B'), ECMA340 (NFCIP-1), and vicinity (ISO/IEC15693, ISO/IEC180003Mod1) standards.
The ST21NFCA system-on-chip combines a complete hardware capability for 13.56 MHz
contactless communication with an useful embedded firmware which handles:
● ISO/IEC 14443 A&B, Calypso V1 Radio Protocol (B'), ECMA340 (NFCIP-1), ISO/IEC
15693, ISO/IEC18000-3Mod1 in card emulation modes as well as reader modes
● Switch modes between operating modes and RF modes
● Host Controller Interface functions (HCI based on the ETSI specification)
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ST21NFCA Description
In addition, the embedded firmware and associated macrocells support handling and
protocol for the various interfaces:
● Single Wire Protocol (SWP) interface fully compliant with ETSI TS 102 613 Release 7
2
● I
C Slave interface fully compliant with NXP specification
● SPI Slave interface fully compliant with Freescale specification
● Asynchronous Receiver Transmitter in master configuration supporting ISO/IEC 7816-3
T=0 and T=1 protocols
The ST21NFCA is a serial access circuit based on a 8/16-bit CPU core. Operations will be
synchronized with an internally generated clock issued by the Clock Generator module. The
internal speed of the device is fully software programmable.
The CPU includes the Arithmetic Logic Unit (ALU), the control logic and registers controlled
by the ST21NFCA firmware. The CPU interfaces with the on-chip RAM, ROM and EEPROM
memories via a 24-bit internal bus offering 16 MBytes of linear addressing space.
This device also includes a True Random Number Generator (TRNG), three 8-bit fully
programmable timers, a Cyclic Redundancy Check (CRC3309) module, and a Data
Encryption Standard (DES) accelerator.
Thanks to an enhanced power switch system, the ST21NFCA is able to support several
power supply sources ("Battery On", Battery Low and Battery Off" modes) which manages
the power management of the device and its associated UICC.
Figure 2. ST21NFCA block diagram
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Description ST21NFCA
1.1 Firmware description
The ST21NFCA is a system on chip solution able to be compliant with NFC communication
system embedded in a mobile phone.
The firmware is developed in several modules:
● Host Controller Interface based on the ETSI specification managing the gates related
to the different protocols, the pipe between gates, the power management system, etc.
● The Operating System (OS) is the core of the system responsible for dispatching
commands to the Host Controller Interface.
● The Switch Mode module manages the operating modes and the switching between all
RF modes.
● Low-level drivers including:
– ISO/IEC 7816 in Master mode
– SPI in Slave mode
2
–I
C in Slave mode
– SWP in Master mode
– RF drivers for all vicinity and proximity standards in Card Emulation and Reader
modes
● Low-level contact and contactless I/O protocols:
– T=0 and T=1 as defined in the ISO/IEC 7816 specification
– T=CL as defined in the ISO/IEC 14443-A,-B specification
– SHDLC as defined in the ETSI SWP specification
Figure 3. Firmware architecture overview
Host Controller Interface
OS and Switch Mode Module
RF ISO/IEC 14443 A B
SPI
Slave
Driver
I²C
Slave
Driver
RF ISO/IEC 15693
RF ECMA 340
Card Emulation and Reader modes
Driver
I²C/SPI
RF Antenna
UICC
SWP
Secure
Element
Master
SWP
SWP
Driver
ISO 7816
Master
Driver
Master
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ST21NFCA Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
8-Feb-2008 1 Initial release.
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ST21NFCA
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