DS1862 datasheet(13/42 Pages) MAXIM

13 / 42 page

XFP Laser Control and Digital Diagnostic IC

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Pin Description

NAME

DESCRIPTION

P-DOWN/RST

Power-Down/Reset Input. This multifunction pin is pulled high internally. See the Power-Down/Reset Pin

section for additional information.

SC-RX-LOS

Signal Conditioner Receiver Loss-of-Signal Input. This pin is an active-high input with LVCMOS/LVTTL

voltage levels.

SC-RX-LOL

Signal Conditioner Receiver Loss-of-Lock Input. This pin is an active-high input with LVCMOS/LVTTL

voltage levels.

THRSET

Threshold Set Output. This pin is a programmable voltage source that can be used for Rx signal

conditioner.

VCC2

1.8V Power-Supply Input

RX-LOS

Receiver Loss-of-Signal. This open-drain output indicates when there is insufficient optical power.

SCL

I2C Serial-Clock Input

FETG

FET Gate Output. This pin can drive an external FET gate associated with safety fault disconnect.

RSSI

Received Power Signal Input

MODSET

Modulation Current Output. This pin is only capable of sinking current.

TX-D

Transmit Disable Input. This pin has an internal pullup resistor.

SDA

I2C Serial-Data Input/Output

EN1

Enable 1 Output. Functional control for signal conditioners.

EN2

Enable 2 Output. Functional control for signal conditioners.

BIASSET

Bias Current Output. This pin is only capable of sinking current.

INTERRUPT

Interrupt. This open-drain output pin indicates a possible operational fault or critical status condition to the

host.

MOD-NR

Indicating Module Operational Fault. Open-drain output. This pin indicates the status of the MOD-NR flag.

AUX1MON

Aux1 Monitor Input. This pin can be used to measure any voltage quantity.

AUX2MON

Aux2 Monitor Input. This pin can be used to measure any voltage quantity or external temperature sensor.

BMD

Monitor Diode Current Input. This pin is capable of sourcing or sinking current.

GND

Ground

MOD-DESEL

Module Deselect Input. This pin must be pulled low to enable I2C communication. This pin is pulled high

internally.

IBIASMON

Bias Monitor Input. This pin can be used to monitor the voltage across the laser.

SC-TX-LOS

Signal Conditioner Transmitter Loss-of-Signal. This pin is an active-high input with LVCMOS/LVTTL

voltage levels.

VCC3

3.3V or 5V Power-Supply Input

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