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PDF STRFNFCA Data sheet ( Hoja de datos )
| Número de pieza | STRFNFCA | |
| Descripción | Near field communication transceiver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STRFNFCA
Near field communication transceiver
Features
■ Operating modes supported:
– Reader/Writer
– Card Emulation
– Peer-to-Peer
■ Hardware features
– Dedicated internal frame controller
– Highly integrated Analog Front End (AFE)
for RF communications
– Transmission and reception modes
– Optimized power management
– Tag Detection mode
– Field Detection mode
■ RF communication @13.56 MHz
– ISO/IEC 14443 Type A and B in Reader
and Card Emulation modes
– ISO/IEC 15693 in Reader mode
– ISO/IEC 18092 in Reader and Card
Emulation modes
■ Communication interfaces with a Host
Controller
– Serial peripheral interface (SPI) Slave
interface up to 2 Mbps
– Universal asynchronous
receiver/transmitter (UART) up to 2 Mbps in
Reader mode only (not available for Card
Emulation mode)
– 256-byte command buffer (FIFO)
■ 32-lead, 5x5 mm, very thin fine pitch quad flat
(VFQFPN) ECOPACK® package
Datasheet −production data
VFQFPN32 5x5 mm
Applications
Typical protocols supported:
■ ISO/IEC 14443-3 Type A and B tags
■ ISO/IEC 15693
■ ISO/IEC 18000-3M1 tags
■ NFC Forum tags: Types 1, 2, 3 and 4
■ ST Dual Interface EEPROM
Typical STRFNFCA applications include:
■ Handheld readers (OTP, PIN pad, POS)
– E-payment, physical access control,
transport, and government
■ PC-Link (USB /Serial/PCMCIA)
– E-payment, security access &
authentication, data exchange)
■ USB token
– Security access & authentication, data
exchange
■ Integrated solution (chipset)
■ Keyboard, laptop, set top box, printer, TV, etc.
■ E-payment, data exchange, Bluetooth pairing,
security access
November 2012
This is information on a product in full production.
Doc ID 023077 Rev 10
1/74
www.st.com
1
1 page  
STRFNFCA
1.2
List of terms
Table 1. List of terms
Term
Meaning
DAC
GND
HFO
LFO
MCU
Digital analog converter
Ground
High frequency oscillator
Low frequency oscillator
Microcontroller unit
NFC
RFID
RFU
SPI
Near Field Communication
Radio Frequency Identification
Reserved for future use
Serial peripheral interface
tL
tREF
UART
WFE
Low frequency period
Reference time
Universal asynchronous receiver-transmitter
Wait For Event
Description
Doc ID 023077 Rev 10
5/74
5 Page 
STRFNFCA
4 Communication protocols
Communication protocols
4.1 Universal asynchronous receiver/transmitter (UART)
The host sends commands to the STRFNFCA and waits for replies. Polling for readiness is
not necessary. The default baud rate is 57600 baud. The maximum allowed baud rate is
2 Mbps.
Figure 6. UART communication
Sending commands to the STRFNFCA
CMD
LEN
DATA
DATA
Receiving data from the STRFNFCA
Resp Code
LEN
Several data bytes
DATA
DATA
Several data bytes
When sending commands, no data must be sent if the LEN field is zero.
When receiving data from the STRFNFCA, no data will be received if the LEN field is zero.
The formats of send and receive packets are identical.
If an ECHO command is sent, only one byte (0x55) is sent by the host.
Figure 7 shows an example of an ECHO command.
Figure 7. ECHO command and response example
Int.
Clock
Host to STRFNFCA
01234567
RX (Echo 0x55) 1
1
0
1
0
1
0
1
01
(Start)
(Stop)
TX
STRFNFCA to Host
Rx
TX (Echo 0x55) 1
1
0
1
0
1
0
1
01
(Start)
(Stop)
Ai18122
Caution:
Note: 1
2
UART communication is LSB first. Stop bit duration is two Elementary Time Units
(ETUs).
When STRFNFCA leaves WFE mode (from Power-up, Hibernate, Sleep/Field Detector or
Tag Detector) following an |RQ_IN/RX low level pulse, this pulse is NOT interpreted as the
UART start bit character.
If the user loses UART synchronization, it can be recovered by sending an ECHO command
until a valid ECHO reply is received. Otherwise, after a maximum of 255 ECHO commands,
Doc ID 023077 Rev 10
11/74
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STRFNFCA.PDF ] | |
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