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CR14 Datasheet(PDF) 2 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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CR14
2/46
Contents
1
Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
Oscillator (OSC1, OSC2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2
Antenna Output Driver (RFOUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3
Antenna Input Filter (RFIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4
Transmitter Reference Voltage (VREF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5
Serial Clock (SCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.6
Serial Data (SDA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.7
Chip Enable (E0, E1, E2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8
Power Supply (VCC, GND, GND_RF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
CR14 registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1
Parameter Register (00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2
Input/Output Frame Register (01h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3
Slot Marker Register (03h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4
CR14 I²C protocol description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1
I²C Start Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2
I²C Stop Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3
I²C Acknowledge Bit (ACK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4
I²C Data Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5
I²C Memory Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6
CR14 I²C Write Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7
CR14 I²C Read Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5
Applying the I²C protocol to the CR14 registers . . . . . . . . . . . . . . . . . . . . 22
5.1
I²C Parameter Register Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2
I²C Input/Output Frame Register Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.3
I²C Slot Marker Register Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.4
Addresses above Location 06h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25




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