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PDF RX95HF Data sheet ( Hoja de datos )
| Número de pieza | RX95HF | |
| Descripción | Near field communication transceiver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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RX95HF
Near field communication transceiver for tag emulation
VFQFPN32 5x5 mm
Datasheet - production data
Applications
Typical protocols supported:
ISO/IEC 14443-3 Type A tag emulation
Typical RX95HF applications include:
Keyboard, laptop, set top box, printer, TV, etc.
Identification, item pairing and data exchange
Features
Operating mode supported:
– Tag Emulation for passive peer-to-peer
communication
Hardware features
– Dedicated internal frame controller
– Highly integrated Analog Front End (AFE)
for RF communications
– Transmission and reception modes in Tag
Emulation mode
– Optimized power management
– Field Detection mode
RF communication @13.56 MHz
– ISO/IEC 14443 Type A in Tag Emulation
mode
Communication interfaces with a Host
Controller
– Serial peripheral interface (SPI) Slave
interface
– Up to 256-byte command/reception buffer
(FIFO)
32-lead, 5x5 mm, very thin fine pitch quad flat
(VFQFPN) ECOPACK®2 package
June 2014
This is information on a product in full production.
DocID023884 Rev 3
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www.st.com
1 page  
RX95HF
1.2
List of terms
GND
HFO
LFO
MCU
NFC
RFID
RFU
SPI
tL
tREF
WFE
Term
Table 1. List of terms
Meaning
Ground
High frequency oscillator
Low frequency oscillator
Microcontroller unit
Near Field Communication
Radio Frequency Identification
Reserved for future use
Serial peripheral interface
Low frequency period
Reference time
Wait For Event
Description
DocID023884 Rev 3
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5 Page 
RX95HF
4 Communication protocols
Communication protocols
4.1
4.1.1
Serial peripheral interface (SPI)
Polling mode
In order to send commands and receive replies, the application software has to perform 3
steps.
1. Send the command to the RX95HF.
2. Poll the RX95HF until it is ready to transmit the response.
3. Read the response.
The application software should never read data from the RX95HF without being sure that
the RX95HF is ready to send the response.
The maximum allowed SPI communication speed is fSCK.
A Control byte is used to specify a communication type and direction:
0x00: Send command to the RX95HF
0x03: Poll the RX95HF
0x02: Read data from the RX95HF
0x01: Reset the RX95HF
The SPI_SS line is used to select a device on the common SPI bus. The SPI_SS pin is
active low.
When the SPI_SS line is inactive, all data sent by the Master device is ignored and the
MISO line remains in High Impedance state.
Figure 6. Sending command to RX95HF
MOSI 0 0 0 0 0 0 0 0
CMD
LEN
DATA
DATA
MISO
Control Byte
Several data bytes
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
Figure 7. Polling the RX95HF until it is ready
MOSI 0 0 0 0 0 0 1 1 X X X X X X 1 1
XXXXXX11 XXXXXX11
MISO
Control Byte
XXXXXXXX 00000XXX
Flag
Flag
00000XXX 00001XXX
Flags are polled until data is ready (Bit 3 is set when data is ready)
DocID023884 Rev 3
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11 Page | ||
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