MIC3002_10 Datasheet, PDF (1/65 Pages) Micrel Semiconductor – FOM Management IC with Internal Calibration

MIC3002
FOM Management IC with Internal
Calibration
General Description
The MIC3002 is a fiber optic module controller which enables
the implementation of sophisticated, hot-pluggable fiber optic
transceivers with intelligent laser control and an internally
calibrated Digital Diagnostic Monitoring Interface per SFF-
8472. It essentially integrates all non-datapath functions of an
SFP transceiver into a tiny (4mm x 4mm) QFN package. It
also works well as a microcontroller peripheral in
transponders 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
internal feedback resistor provides a wide dynamic range for
the APC. Controlled laser turn-on facilitates hot plugging.
An analog-to-digital converter converts the measured
temperature, voltage, bias current, transmit power, and
received power from analog to digital. An EEPOT provides
front-end adjustment of RX power. Each parameter is
compared against user-programmed warning and alarm
thresholds. Analog comparators and DACs provide high-
speed monitoring of received power and critical laser
operating parameters. Data can be reported as either
internally calibrated or externally calibrated.
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.
In addition to the features listed above which are already
implemented in the previous controller MIC3001, the
MIC3002 features an extensive temperature range, options
to mask alarms and warnings interrupt and TXFAULT, and
ability to support up to four chips with the same address on
the serial interface.
Communication with the MIC3002 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
• Extensive temperature range
• Alarms and Warnings interrupt and TXFAULT masks
• Capability to support up to four chips on the serial
interface
• LUT to compensate for chip-FOM case temperature
difference
• APC or constant-current laser bias
• Turbo mode for APC loop start-up and shorter laser turn
on time
• Supports multiple laser types and bias circuit topologies
• Integrated digital temperature sensor
• Temperature compensation of modulation, bias, and
fault levels via NVRAM look-up tables
• 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
– Internal or external calibration
– EEPOT for adjusting RX power measurement
• Power-on hour meter
• Interrupt capability
• Extensive test and calibration features
• 2-wire SMBus-compatible serial interface
• SFP/SFP+ MSA and SFF-8472 compliant
• 3.0V to 3.6V power supply range
• 5V-tolerant I/O
• Available in (4mm x 4mm) 24-pin QFN package
Applications
• SFP/SFP+ optical transceivers
• SONET/SDH transceivers and transponders
• Fibre Channel transceivers
• 10Gbps transceivers
• Free space optical communications
• Proprietary optical links
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2007
M9999-073107-B
[e-mail] or [phone]