Newport 5600 Series - Figure 13 - Laser Driver Block Diagram; Laser Interface

34 Chapter 4 Principles of Operation
Freq
DAC
Optically
Isolated
Serial
Bus
Microprocessor
To
Limit DAC
Fault Monitors
A/D Converter
Output On/Off
and
Slow Turn-On
Regulated
Supply
Output
Shorting
Output
Laser
Current
Sensing
Diode
Current
Feedback
Set Point
DAC
Modulation
Input Port
Thermopile
Voltage
Sensing
Internal
Modulation
Pass
T
ransistor
Pulse
Gen.
Current
Monitor
Trigger In
Trigger Out
Photodiode
Figure 13 - Laser Driver Block Diagram
4.2.1 Laser Interface
The laser interface provides optically isolated serial communications
between the laser board and the microprocessor. Control signals are passed
to the laser board to set the laser board status, current limit, current set
points, and photodiode feedback functions. Instructions and data are sent
over the serial interface to the optical barrier. Status and data are serially
passed back to the microprocessor.
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