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CR14 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. CR14
Description  Low Cost ISO14443 type-B Contactless Coupler Chip with Anti-Collision and CRC Management
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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1 Summary description
CR14
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Summary description
The CR14 is a contactless coupler that is compliant with the short range ISO14443 type-B
standard. It is controlled using the two wire I²C bus.
The CR14 generates a 13.56MHz signal on an external antenna. Transmitted data are
modulated using Amplitude Shift Keying (ASK). Received data are demodulated from the PICC
(Proximity integrated Coupling Card) load variation signal, induced on the antenna, using Bit
Phase Shift Keying (BPSK) of a 847kHz sub-carrier. The Transmitted ASK wave is 10%
modulated. The Data transfer rate between the CR14 and the PICC is 106 Kbit/s in both
transmission and reception modes.
The CR14 follows the ISO14443 type-B recommendation for Radio frequency power and signal
interface.
The CR14 is specifically designed for short range applications that need disposable and
reusable products.
The CR14 includes an automated anti-collision mechanism that allows it to detect and select
any ST short range memories that are present at the same time within its range. The anti-
collision mechanism is based on the STMicroelectronics probabilistic scanning method.
The CR14 provides a complete analog interface, compliant with the ISO14443 type-B
recommendations for Radio-Frequency power and signal interfacing. With it, any ISO14443
type-B PICC products can be powered and have their data transmission controlled via a simple
antenna.
The CR14 is fabricated in STMicroelectronics High Endurance Single Poly-silicon CMOS
technology.
The CR14 is organized as 4 different blocks (see Figure 2):
The I²C bus controller. It handles the serial connection with the application host. It is
compliant with the 400kHz I²C bus specification, and controls the read/write access to all
the CR14 registers.
The RAM buffer. It is bi-directional. . It stores all the request frame Bytes to be transmitted
to the PICC, and all the received Bytes sent by the PICC on the answer frame.
The transmitter. It powers the PICCs by generating a 13.56MHz signal on an external
antenna. The resulting field is 10% modulated using ASK (amplitude shift keying) for
outgoing data.
The receiver. It demodulates the signal generated on the antenna by the load variation of
the PICC. The resulting signal is decoded by a 847kHz BPSK (binary phase shift keying)
sub-carrier decoder.
The CR14 is designed to be connected to a digital host (Microcontroller or ASIC). This host has
to manage the entire communication protocol in both transmit and receive modes, through the
I²C serial bus.




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