CR14 STMicroelectronics, CR14 Datasheet - Page 26

• Manufacturer Part Number: CR14
• Description: Low Cost Iso14443 Type-b Contactless Coupler Chip With Anti-collision And Crc Management
• Manufacturer: STMicroelectronics

6 CR14 ISO14443 type-B Radio Frequency data transfer
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CR14 ISO14443 type-B Radio Frequency data
transfer
Output RF Data Transfer from the CR14 to the PICC (Request
Frame)
The CR14 output buffer is controlled by the 13.56MHz clock signal generated by the external
oscillator and by the request frame generator. The CR14 can be directly connected to an
external matching circuit to generate a 13.56MHz sinusoidal carrier frequency on its antenna.
The current driven into the antenna coil is directly generated by the CR14 RFOUT output driver.
If the antenna is correctly tuned, it emits an H-field of a large enough magnitude to power a
contactless PICC from a short distance. The energy received on the PICC antenna is converted
to a Power Supply Voltage by a regulator, and turned into data bits by the ASK demodulator.
The CR14 amplitude modulates the 13.56MHz wave by 10% as represented in
data transfer rate is 106 kbit/s.
Figure 19. Wave Transmitted using ASK Modulation
10% ASK MODULATION
OF THE 13.56MHz WAVE,
GENERATED ON THE CR14
ANTENNA
10% ASK MODULATION
OF THE 13.56MHz WAVE,
GENERATED BY THE RF OUT
DRIVER
DATA BIT TRANSMITTED
BY THE CR14
Transfer time for one data bit is 1/106 kHz
Figure
19. The
CR14
AI12048