DS1862 datasheet(21/42 Pages) MAXIM

21 / 42 page

XFP Laser Control and Digital Diagnostic IC

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Warning and Alarm Logic Based on

AUX1/2MON, VCC2/3, Temp, RX-P,

and IBIASMON

The DS1862 is capable of generating an alarm and/or

warning whenever an analog monitored channel goes

out of a user-defined tolerance. Temperature, bias cur-

rent (based on IBIASMON), receive power (based on

RSSI), AUX1MON, AUX2MON, and VCC2/3, are moni-

tored channels that generate latched flags. See the fig-

ure below for more detail pertaining to AUX1MON and

AUX2MON. Flags are latched into a high state the first

time a monitored channel goes out of the defined oper-

ating window and for each monitored signal there is a

Mask bit that can be set to prevent the corresponding

alarm or warning flag from being set. Once a flag is set,

it is cleared by simply reading its memory location.

AUX1/2MON LOGIC

AUX1MON (PIN)

AUX2MON (PIN)

MASK BIT

AUX1MON

AUX2MON

ADC

THRESHOLD

AUX1MON

(APD MODE)

LATCHED-APD-

SUPPLY-FAULT

AUX2MON

(APD MODE)

INTERRUPT (PIN)

*COMPARATOR LOGIC IS

DUPLICATED FOR HIGH

AND LOW ALARMS AND

WARNINGS.

ADC

THRESHOLD

AUX1MON

(LASER WL MODE)

LATCHED-

WAVELENGH-UL

AUX2MON

(LASER WL MODE)

AUX1MON

(VEE5 MODE)

LATCHED-VEE5

AUX2MON

(VEE5 MODE)

AUX1MON

(VCC2 MODE)

LATCHED-VCC2

AUX2MON

(VCC2 MODE)

AUX1MON

(TEC MODE)

LATCHED-TEC-

FAULT

AUX2MON

(TEC MODE)

AUX1MON

(VCC5 MODE)

LATCHED-VCC5

AUX2MON

(VCC5 MODE)

AUX1MON

(VCC3 MODE)

LATCHED-VCC3

AUX2MON

(VCC3 MODE)

ANY FLAG

CORRESPONDING MASK

BIT

Figure 10. AUX1/2 Monitor Logic

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