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PDF CR95HF Data sheet ( Hoja de datos )
| Número de pieza | CR95HF | |
| Descripción | 13.56-MHz multi-protocol contactless transceiver IC | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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CR95HF
13.56-MHz multi-protocol contactless transceiver IC
with SPI and UART serial access
Datasheet - production data
VFQFPN32 5x5 mm
Communication interfaces with a Host
Controller
– Serial peripheral interface (SPI) Slave
interface
– Universal asynchronous
receiver/transmitter (UART)
– Up to 528-byte command/reception buffer
(FIFO)
32-lead, 5x5 mm, very thin fine pitch quad flat
(VFQFPN) ECOPACK®2 package
Features
Operating modes supported:
– Reader/Writer
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
RF communication @13.56 MHz
– ISO/IEC 14443 Type A and B
– ISO/IEC 15693
– ISO/IEC 18092
– MIFARE® Classic compatible (a) (b)
Applications
Typical protocols supported:
ISO/IEC 14443-3 Type A and B tags
ISO/IEC 15693 tags
ISO/IEC 18000-3M1 tags
NFC Forum tags: Types 1, 2, 3 and 4
ST short-range interface (SRI) tags
ST long-range interface (LRI) tags
ST Dual Interface EEPROM
a. MIFARE and MIFARE Classic are registered
trademarks of NXP B.V. and are used under license.
b. Parity Framing mode is compatible with
MIFARE® Classic requirements. However, access to
Authenticated state must be supported by an external
secure host which embeds the MIFARE® Classic
library.
October 2014
This is information on a product in full production.
DocID018669 Rev 10
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www.st.com
1 page  
CR95HF
1.2
List of terms
Term
DAC
GND
HFO
LFO
MCU
NFC
RFID
RFU
SPI
tL
tREF
UART
WFE
Table 1. List of terms
Meaning
Digital analog converter
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
Universal asynchronous receiver-transmitter
Wait For Event
Description
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CR95HF
4 Communication protocols
Communication protocols
4.1 Universal asynchronous receiver/transmitter (UART)
The host sends commands to the CR95HF 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 CR95HF
CMD
LEN
DATA
DATA
Receiving data from the CR95HF
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 CR95HF, 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
CR95HF
Internal
Clock
01234567
Host to CR95HF
RX (Echo 0x55) 0
1
0
1
0
1
0
1
0 11
(Start)
(Stop)
TX
CR95HF to Host
RX
TX (Echo 0x55) 0
1
0
1
0
1
0
1
0 11
(Start)
(Stop)
Ai18122a
Caution:
Note: 1
2
UART communication is LSB first. Stop bit duration is two Elementary Time Units
(ETUs).
When CR95HF leaves WFE mode (from Power-up, Hibernate, Sleep 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 528 ECHO commands,
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