Rainbow Electronics DS1862 - Manual (Page 33)

DS1862
XFP Laser Control and Digital Diagnostic IC
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85h
• APC REF FINE .................< R-Module / W-Module ><00> This 2-bit value in <1:0>
sets the fine APC current on BMD. The MSB is bit 6.
86h
• LUT Range.......................< R-Module / W-Module ><00> This 3-bit register in <2:0>
sets the current range on MODSET. The MSB is bit 2.
87h
• Control Reg1....................< R-Module / W-Module ><00>
Bit 0: Reserved.
Bit 1: SRC_SNK_B. If set, then BMD sources current, otherwise BMD sinks current.
Bit 2: Reserved.
Bit 3: Reserved.
Bit 4: QT TX-P Low mask. If set, then TX-P low does not have the ability to cause a safety fault.
Bit 5: QT HIGH BIAS mask. If set, then HIGH BIAS does not have the ability to cause a safety fault.
Bit 6: QT TX-P High mask. If set, then TX-P high does not have the ability to cause a safety fault.
Bit 7: FETG_POL. If set, then FETG asserts with a high logic level, otherwise it asserts with a low logic level.
88h
• QT TX-P HI .......................< R-Module / W-Module > This is the TX-P quick-trip
threshold setting that is used as a comparison to generate a TX-P High saftey fault.
89h
• QT TX-P LO......................< R-Module / W-Module ><00> This is the TX-P quick-trip
threshold setting that is used as a comparison to generate a TX-P Low saftey fault.
8Ah
• QT HIGH BIAS .................< R-Module / W-Module > This is the TX-P quick-trip
threshold setting that is used as a comparison to generate a BIAS High saftey fault.
8Bh
• Control Reg2....................< R-Module / W-Module ><00>.
Bit 0: Reserved.
Bit 1: Reserved.
Bit 2: Reserved.
Bit 3: Reserved.
Bit 4: TEMP_INT-EXT. If set, then the LUT index pointer is controlled by AUX2MON. Otherwise the internal temper-
ature sensor controls the LUT.
Bit 5: Reserve_EN. If set, then V CC2/3 is actively updated in the monitor loop.
Bit 6: Reserved.
Bit 7: Reserved.