X9523 Datasheet, PDF (1/30 Pages) Intersil Corporation – Laser Diode Control for Fiber Optic Modules

®
PRELIMINARY
Data Sheet
X9523
Laser Diode Control for Fiber Optic Modules
March 10, 2005
FN8209.0
Dual DCP, POR, Dual Voltage Monitors
FEATURES
• Two Digitally Controlled Potentiometers (DCPs)
—100 Tap - 10kΩ
—256 Tap - 100kΩ
— 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 packages
— XBGA^TM
— TSSOP
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
WP
SDA
SCL
MR
V3
V2
V1 / Vcc
DATA
REGISTER
COMMAND
DECODE &
CONTROL
LOGIC
THRESHOLD
RESET LOGIC
PROTECT LOGIC
8
CONSTAT
REGISTER
2
-
VTRIP₃
+
-
VTRIP ₂
+
+
VTRIP₁
-
WIPER
COUNTER
REGISTER
7 - BIT
NONVOLATILE
MEMORY
WIPER
COUNTER
REGISTER
8 - BIT
NONVOLATILE
MEMORY
POWER-ON /
LOW VOLTAGE
RESET
GENERATION
R_H1
R_W1
R_L1
R_H2
R_W2
R_L2
V3RO
V2RO
V1RO
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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