ST ST21NFCA User Manual

Features
VFQFPN32
VFBGA64
ST21NFCA operating modes supported:
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
ST21NFCA Description
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 (Full and Low Power modes) which manage the power management of the device and its associated UICC.

Figure 2. ST21NFCA block diagram

VCC_UICC_IN
VCC_UICC_OUT
GND
VPS_MAIN from PMU
CD2
VBAT
SWP I2C Wakeup SPI ISO/IEC 7816
Power
Manage-
ment
8-bit
ST21
CPU
SWP
SDA
VPS_MAIN
EEPROM
36 Kbytes
SCL
VPS_MAIN from PMU
VPS_TX GND_TX
ST21NFCA
User ROM
112 Kbytes
Peripherals
NSS
IRQ_OUT
SCK
CD1
Management
4 Kbytes
MOSI
Clock
MISO
RAM
IART
GPIO1
NC
CA1
CA3
GND_RX
CQ1
27.12 MHz
CQ2
CA2
Ai18125
XIN
XOUT
TX1
Analog Frontend
GPIO2
VDC
TX2
RX1
RX2
CT1 EXT_CAP
Peripherals

1.1 Firmware overview

ST21NFCA embedded firmware manages NFC operating functions and provides an interface for communication with different hosts (Application Processor, USIM, eSE, etc.).
This firmware includes:
RF drivers for vicinity and proximity standards in Card Emulation and Reader/Writer
modes.
Host Controller Interface (HCI), an interface protocol module that manages
communication channels between all devices integrated inside mobile phone, and defined in the [ETSI HCI] specification.
This interface uses HCP over SHDLC stack protocol:
Over I
Over SWP (CLF in Master mode) for communication with the SIM (UICC).
2
C or SPI (CLF in Slave mode) for communication with a host processor).
Doc ID 14403 Rev 3 3/5
Revision history ST21NFCA

Figure 3. Host controller block diagram

2 Revision history

Table 1. Document revision history

Date Revision Changes
8-Feb-2008 1 Initial release.
27-Jan-2012 2
21-Feb-2012 3 Updated evaluation kit information.
4/5 Doc ID 14403 Rev 3
Modified Features, Section 1.1: Firmware overview, Figure 1,
Figure 2, and Figure 3.
ST21NFCA
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Doc ID 14403 Rev 3 5/5
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