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Status LED indicators STATUS1 and STATUS2. STATUS1 LED will blink 300ms ON and 300ms OFF in
normal mode. More frequent (100ms-100ms) blinking mean device is in “bootloader” mode. STATUS2 LED is
connected to processor, but not programmed for any actions - reserved for future functionality expansion.
Chapter 4. Device Specifications
Device specifications are listed below.
Laser diode current - programmable up to 200mA,
Output noise is less than 1 μA RMS,
PID control of laser diode temperature stability - better than +-0.001C (with NTC
resistor integrated into laser diode device),
PID control settings – programmable,
Dedicated for laser diodes:
o
operating voltage about 2V,
o
isolated case (or cathode grounded),
o
Peltier element and NTC 10k,
o
Peltier element parameters: voltage about 2V and current up to 1000mA.
Main mode is “constant current”. Mode “constant power” is optional, require
photodiode (isolated or “anode grounded”) and require modifications on board (to
solder few resistors).
List of main parameters:
o
Power supply – 5V DC, 1A (connector “2.1/5.5, center is plus”)
o
Laser diode current - programmable up to 200mA
o
Low pass filter at output of laser diode driver - 1 ohm and 47 μF.
o
Laser diode temperature control by Peltier element and by NTC resistor –
programmable from 12C to 30C (usually 16C).
o
Peltier driver is bipolar, can source plus or minus 3V on 10 ohm.
o
Peltier driver type is low noise linear full bridge amplifier.
o
Low pass filter at output of Peltier driver - 2x100 μH and 4x47 μF.
o
Laser diode connector of type DB9 (pins for laser diode, Peltier element, NTC
resistor and for optional photodiode).
o
Programmability – by using mini USB connector and Virtual COM port based on
Ftdichip solution (available on all main operating systems by download from
Ftdichip.com or from shipped media (USB Flash or CD) (if shipped) or from
Standa file server).
o
USB interface is galvanic isolated from the device electronics.
o
Software – available user interface for Windows (from shipped media (USB
Flash or CD) (if shipped) or from Standa file server) and Windows dll libraries
(on request).
