Lighting Board; Sounder - Access OCR640 Operational Description

Lighting board:

Device classification
Operating Voltage / Current
Digital/Analog
Switching Frequency
LED drive Voltage / Current
Intentional Radiation
Software requirements
Operational Description:
The lighting board drives a set of IR, UV and white LEDs. The circuit is controlled by the imager circuit
through I2C interface. The choice of IR/UV/White illumination is done by the host application and is
handed down to the lighting 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
Operating Voltage / Current
Digital/Analog
Operating Frequency
Intentional Radiation
Software requirements
Operational Description:
Sounder block is basically a small microcontroller that generates tones. The sounder controller receives
commands from the camera digital circuit on which tone it has to play. With this kind of arrangement,
the USB host software can access the sounder through the camera digital circuit.
Boost regulator for lighting application
5V / 250mA
Analog circuitry
~500KHz
~25V / 20mA (Drives a string of IR, UV, White LEDs)
No
None. Starts up as soon as power is applied
Audible tone generator
3.3V / 20mA
Digital circuitry
8 MHz
No
None. Camera imager digital circuit controls the tone generator. The
communication is through SPI interface operating at 100KHz.