Measurement Setup
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SLLU256 – October 2016
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Copyright © 2016, Texas Instruments Incorporated
ONET1131EC Evaluation Module
4.2
Closed Loop Operation with Fault Detection and Digital Monitoring
The following steps are provided for closed loop operation with fault detection and digital monitoring:
1. To configure the part for automatic power control with digital monitoring and fault detection, place a
jumper between pins 1 and 2 of JMP26 to supply –2.5 V to the photodiode current mirror.
2. Go to the
Core Configuration
page as shown in
Figure 9
.
Figure 9. Core Configuration Page
3. Disable the laser bias current to prevent a fault from occurring when the
Fault Detection
is enabled.
4. Select
Enable Fault Detection
and
Enable the Fault Trigger on MONP Pin
.
5. Set the
TX Bias Current Control
to
Closed Loop
and initially use the default 770-µA
TX Photodiode
Current Range
.
6. Enable the laser bias current.
7. In the
Analog to Digital Conversion
box, enable the ADC and ADC oscillator and select the desired
parameter to be monitored using the drop-down box.