MIC3000 Datasheet, PDF (1/68 Pages) Micrel Semiconductor – SFP Management IC

MIC3000
MIC3000
SFP Management IC
Micrel
General Description
The MIC3000 enables the implementation of sophisticated,
hot-pluggable fiber optic transceivers with intelligent laser
control and Digital Diagnostic Monitoring Interface per SFF-
8472. It essentially integrates all non-datapath functions of an
SFP transceiver into a tiny 4mm × 4mm MLF™ package. It
also works well as a microcontroller peripheral in transpon-
ders or 10Gbps transceivers.
A highly configurable automatic power control (APC) circuit
controls laser bias. Bias and modulation are temperature
compensated using dual DACs, an on-chip temperature
sensor, and NVRAM look-up tables. A programmable inter-
nal feedback resistor provides unprecedented dynamic range
for APC. Controlled laser turn-on facilitates hot-plugging.
An analog-to-digital converter converts the measured tem-
perature, voltage, bias current, transmit power, and received
power from analog-to-digital. Each parameter is compared
against user-programmed warning and alarm thresholds.
Analog comparators and DACs provide high-speed monitor-
ing of received power and critical laser operating parameters.
An interrupt output, power-on hour meter, and data-ready bits
add user friendliness beyond SFF-8472. The interrupt output
and data-ready bits reduce overhead in the host system. The
power-on hour meter logs operating hours using an internal
real-time clock and stores the result in NVRAM.
Communication with the MIC3000 is via an industry standard
2-wire serial interface. Nonvolatile memory is provided for
serial ID, configuration, and separate OEM and user
scratchpad spaces. Two-level password protection guards
against data corruption.
Features
• APC or constant-current laser bias
• Supports multiple laser types and bias circuit topologies
• Drives external low-cost BJT for laser bias
• Integrated digital temperature sensor
• Temperature compensation of modulation, bias, and
fault levels via NVRAM look-up tables
• Direct interface to SY88932, SY88982, SY89307 and
other drivers
• NVRAM to support GBIC/SFP serial ID function
• User writable EEPROM scratchpad
• Diagnostic monitoring interface per SFF-8472
– Monitors and reports critical parameters:
temperature, bias current, TX and RX optical power,
and supply voltage
– S/W control and monitoring of TXFAULT, RXLOS,
RATESELECT, and TXDISABLE
– External calibration
• Power-on hour meter
• Interrupt capability
• Extensive test and calibration features
• 2-wire I²C compatible serial interface
• SFP MSA and SFF-8472 compliant
• 3.0V to 3.6V power supply range
• 5V-tolerant I/O
• 4mm × 4mm 24-pin MLF™ package
Applications
• SFF/SFP optical transceivers
• SONET/SDH transceivers and transponders
• Fibre channel transceivers
• 10Gbps transceivers
• Free space optical communications
• Proprietary optical links
Ordering Information
Part Number
MIC3000BML
Junction Temp. Range
–45°C to +105°C
Package
24-pin MLF™
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
October 2004
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M9999-101204