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Fig 5: OCR640 Antenna #1 – Typical Impedance and Phase plot

Fig 6: OCR640 Antenna #2 – Typical Impedance and Phase plot

As said earlier, the RF energy is switched between the antennas one at a time, scanning for RFID
passports. The antenna switching and the polling sequence timing are shown in the following diagram.

Z = 50 Ohm (+/- 3 Ohm)

Ф = +/- 10 degree

Z = 50 Ohm (+/- 3 Ohm)

Ф = +/- 10 degree

Содержание OCR640

Страница 1: ...ss reader The camera is used to capture images by the host application which then decodes the passport MRZ data The MRZ data is then sent to the RFID reader to authenticate with the RFID chip in the passport to read the data The following figure shows the hardware architecture of OCR640 Fig 1 OCR640 Hardware Architecture ...

Страница 2: ...x20 480 MHz internal frequency Data transfer rate 480Mbps Intentional Radiation No Software requirements USB host should have generic USB hub driver All windows machine supports this USB hub class and it should start up right away There are not application software requirements Operational Description High speed USB hub 1 This high speed USB hub is used for future extension of the product High spe...

Страница 3: ...utdown state when there is no application software running For normal operation camera application software like Amcap or IScap should be running It should be noted that the lighting circuit is controlled by the imager The right illumination could be selected appropriately by the imager circuit and this kind of arrangement helps the USB host software to control the illumination The following diagr...

Страница 4: ...hting board through the I2C interface The lighting board has a step up DC DC converter and current controlled LED drivers to accomplish the intended purpose Sounder Device classification Audible tone generator Operating Voltage Current 3 3V 20mA Digital Analog Digital circuitry Operating Frequency 8 MHz Intentional Radiation No Software requirements None Camera imager digital circuit controls the ...

Страница 5: ...n reader tool is required RFID Contactless Reader Analog Section Device classification RFID transceiver Operating Voltage Current 5V 150mA RFID protocol ISO14443 Type A and Type B Digital Analog Analog circuitry Crystal Frequency 13 56 MHz PLL Multiplier None RF Data transfer rate 424 Kbps Intentional Radiation Yes Carrier frequency 13 56 Mhz 7 KHz Sub Carrier frequency 847 KHz max Number of Anten...

Страница 6: ...The RFID reader uses loop antenna to radiate RF energy The antennas are tuned to 50 Ohm impedance with a phase angle of 10 degrees The following diagram shows a simplified circuitry of the antenna Fig 4 RFID loop antenna circuit The antenna board has two loop antennas tuned to operate at 13 56 MHz Antenna 1 is around the glass window and antenna 2 is below the front face of the product Variable ca...

Страница 7: ...Typical Impedance and Phase plot As said earlier the RF energy is switched between the antennas one at a time scanning for RFID passports The antenna switching and the polling sequence timing are shown in the following diagram Z 50 Ohm 3 Ohm Ф 10 degree Z 50 Ohm 3 Ohm Ф 10 degree ...

Страница 8: ...D passport As long as the passport stays in the communicable range the antenna switching polling does not happen It should be noted that the reader always does transceive operation i e Transmits command and receives or expects reception of data from the RFID passport Hence it is NOT possible to have the reader in transmit only or receive only mode ...

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