ST ST21NFCA User Manual
Features
VFQFPN32
VFBGA64
ST21NFCA operating modes supported:
■ Card emulation
■ Reader/Writer
■ Peer-to-peer communication
ST21NFCA
Near field communication microcontroller
Data brief
Hardware features
■ Enhanced 8/16-bit CPU core
■ 112 Kbytes of ROM
■ 4 Kbytes of RAM
■ 36 Kbytes of EEPROM
■ High integrated analog front end (AFE) for RF
transmission and reception including automatic
card and field detection modes
■ Full Power and Low Power modes supported
■ Optimized power consumption modes
■ SIM and ST21NFCA power management
functions
■ 3V power supply
■ Supports Class B and C for UICC (Universal
Integrated Circuit Card)
RF communications
■ ISO/IEC 14443 A&B in both PICC (Proximity
Card) and PCD (Proximity Coupling Device)
modes
■ ISO/IEC 15693 in VCD (Vicinity Coupling
Device) mode
■ ISO/IEC 18092 (NFCIP-1)
■ NFC Forum tags types 1 to 4 supported
(Topaz®, MIFARE® Ultralight, Jewel®,
FeliCa™ Open Tag, ST23YR18/80 with Type 4
applet)
Host communication interfaces
■ Single Wire Protocol (SWP) interface with
support for contactless tunneling mode (CLT)
2
■ I
C Slave interface
■ SPI Slave interface
■ Interrupt mode for SPI and I
2
C interfaces
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 (based on [ETSI
TS 102 622 HCI])
■ Product configuration/patchability via I
2
C and
SPI
■ Automatic AID (Application Identifier) routing
■ Dual Secure Element support
Evaluation kit
■ An evaluation board is available to evaluate the
advantages of the ST21NFCA router IC and to
facilitate the development of NFC, Contactless
and RFID applications. Please contact ST
sales office for more information.
February 2012 Doc ID 14403 Rev 3 1/5
For further information contact your local STMicroelectronics sales office.
www.st.com
5
Description ST21NFCA
1 Description
The ST21NFCA is a standalone chip designed for supporting 13.56 MHz contactless
communication, including Near Field Communication (NFC) functions in three operating
modes: card emulation, reader/writer and peer-to-peer communication.
The ST21NFCA is designed for an optimized integration with the standard communication
links for a cell phone.
Figure 1. Mobile phone communication links
The ST21NFCA system-on-chip includes embedded firmware which handles:
● ISO/IEC 14443 A&B and ISO/IEC 18092 (NFCIP-1) in Card Emulation modes as well
as Reader modes
● Polling loop for RF card and RF reader detection
● Host Controller Interface functions (HCI based on the ETSI specification)
In addition, the embedded firmware and associated hardware IPs support handling and
protocol for the various interfaces:
● Single Wire Protocol (SWP) interface fully compliant with [ETSI_SWP]
2
● I
C Slave interface up to 400 kHz fully compliant with [I2C] fast mode
● SPI Slave interface up to 1 MHz
The ST21NFCA is a serial access circuit based on a 8/16-bit CPU core. Operations are
synchronized with an internally generated clock issued by the Clock Generator module.
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.
2/5 Doc ID 14403 Rev 3
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