mic3003gfltr Micrel Semiconductor, mic3003gfltr Datasheet - Page 28

• Manufacturer Part Number: mic3003gfltr
• Description: Fom Management Ic With Internal Calibration
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
July 2010
Fault Comparators
In addition to detecting and reporting the events specified
in SFF-8472, the MIC3003 also monitors five fault
conditions: inadequate supply voltage, thermal diode
faults, excessive bias current, excessive transmit power,
and APC op-amp saturation. Comparators monitor these
parameters in order to respond quickly to fault conditions
that could indicate link failure or safety issues, see Figure
10. When a fault is detected, the laser is shut down and
TXFAULT is asserted. Each fault source may be
independently disabled using the FLTMSK register.
FLTMSK is non-volatile, allowing faults to be masked only
during calibration and testing or permanently.
Figure 9. MIC3003 Power-On Timing (OE = 1)
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Figure 10. Fault Comparator Logic
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MIC3003GFL