1

®

FN8209.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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X9523

Laser Diode Control for Fiber Optic Modules

Dual DCP, POR, Dual Voltage Monitors

FEATURES

• Two Digitally Controlled Potentiometers (DCPs)

—100 Tap - 10k

Ω

—256 Tap - 100k

Ω

—Nonvolatile

—Write Protect Function

• 2-Wire Industry Standard Serial Interface

• Power-On Reset (POR) Circuitry

—Programmable Threshold Voltage

—Software Selectable reset timeout

—Manual Reset

• Two Supplementary Voltage Monitors

—Programmable Threshold Voltages

• Single Supply Operation

—2.7V to 5.5V

• Hot Pluggable

• 20 Pin Package

—TSSOP

• Pb-Free Plus Anneal Available (RoHS Compliant)

DESCRIPTION

The X9523 combines two Digitally Controlled Potenti-

ometers (DCPs), V1 / Vcc Power-on Reset (POR) cir-

cuitry, qnd two programmable voltage monitor inputs

with software and hardware indicators. All functions of

the X9523 are accessed by an industry standard 2-Wire

serial interface.

The DCPs of the X9523 may be utilized to control the

bias and modulation currents of the laser diode in a Fiber

Optic module. The programmable POR circuit may be

used to ensure that V1 / Vcc is stable before power is

applied to the laser diode / module. The programmable

voltage monitors may be used for monitoring various

module alarm levels.

The features of the X9523 are ideally suited to simpli-

fying the design of fiber optic modules . The integra-

tion of these functions into one package significantly

reduces board area, cost and increases reliability of

laser diode modules.

BLOCK DIAGRAM

DATA

REGISTER

COMMAND

DECODE &

CONTROL

LOGIC

SDA

SCL

POWER-ON /

LOW VOLTAGE

CONSTAT

REGISTER

PROTECT LOGIC

THRESHOLD

RESET LOGIC

GENERATION

RESET

V2

VTRIP

V1 / Vcc

VTRIP

V3

+

-

2

3

1

V1RO

MR

8

WIPER

REGISTER

COUNTER

V2RO

WP

V3RO

7 - BIT

NONVOLATILE

MEMORY

NONVOLATILE

MEMORY

WIPER

REGISTER

COUNTER

8 - BIT

2

VTRIP

+

-

+

-

Data Sheet

January 3, 2006

NOT RECO

MMENDE

D FOR NE

W DESIG

NS

NO RECO

MMENDE

D REPLA

CEMENT

contact o

ur Techni

cal Suppo

rt Center

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