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MIC3000: DescriptionFOM Management IC; File Size444KB，68 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

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MIC3000 Overview

FOM Management IC

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MIC3000

Micrel

MIC3000

FOM Management IC

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 x 4mm MLF

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 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 I

C compatible serial interface

SFP MSA and SFF-8472 compliant

3.0V to 3.6V power supply range

5V-tolerant I/O

4mm x 4mm 24-pin MLF

package

SFF/SFP optical transceivers

SONET/SDH transceivers and transponders

Fibre channel transceivers

10Gbps transceivers

Free space optical communications

Proprietary optical links

•

Applications

Ordering Information

Part Number

MIC3000BML

Junction Temp. Range

–45°C to +105°C

Package

24-pin MLF™

MicroLeadFrame

and MLF are registered trademarks of Amkor Technology, Inc.

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October 2004

M9999-101204

MIC3000

Micrel

Contents

General Description ................................................................................................................................................................................ 1

Features .................................................................................................................................................................................................... 1

Applications ............................................................................................................................................................................................. 1

Ordering Information .............................................................................................................................................................................. 1

Pin Configuration .................................................................................................................................................................................... 5

24-Lead MLF™ ......................................................................................................................................................................................... 5

Pin Descriptions ................................................................................................................................................................................. 5-6

Absolute Maximum Ratings ................................................................................................................................................................... 7

Operating Ratings ................................................................................................................................................................................... 7

Electrical Characteristics ................................................................................................................................................................. 7-11

Timing Diagram ..................................................................................................................................................................................... 11

Serial Interface Timing .......................................................................................................................................................................... 11

Address Map .......................................................................................................................................................................................... 12

Table 1. MIC3000 Address Map, Serial address = A0h ..................................................................................................................... 12

Table 2. MIC3000 Address Map, Serial Address = A2h ..................................................................................................................... 12

Table 3. Temperature Compensation Tables, Serial Address = A4h ................................................................................................. 13

Table 4. OEM Configuration Registers, Serial Address = A6h ........................................................................................................... 13

Block Diagram ....................................................................................................................................................................................... 14

Figure 1. MIC3000 Block Diagram ...................................................................................................................................................... 14

Analog-to-Digital Converter/Signal Monitoring ................................................................................................................................. 14

Figure 2. Analog-to-Digital Converter Block Diagram ......................................................................................................................... 15

Table 5. A/D Input Signal Ranges and Resolutions ........................................................................................................................... 15

Table 6. VAUX Input Signal Ranges and Resolutions ........................................................................................................................ 15

External Calibration .............................................................................................................................................................................. 16

Voltage .................................................................................................................................................................................................... 16

Temperature ........................................................................................................................................................................................... 16

Bias Current ........................................................................................................................................................................................... 16

TX Power ................................................................................................................................................................................................ 16

RX Power ................................................................................................................................................................................................ 16

Laser Diode Bias Control ..................................................................................................................................................................... 17

Figure 3. MIC3000 APC and Modulation Control Block Diagram ...................................................................................................... 17

Figure 4. Programmable Feedback Resistor ...................................................................................................................................... 17

Laser Modulation Control ..................................................................................................................................................................... 17

Figure 5. Transmitter Configurations Supported by MIC3000 ..................................................................................................... 17

Figure 6. VMOD Configured as Voltage Output with Gain ........................................................................................................... 18

Power ON and Laser Start-Up .............................................................................................................................................................. 19

Table 8. Shutdown State of SHDN vs. Configuration Bits .................................................................................................................. 19

Figure 7. MIC3000 Power-On Timing (OE=1) .................................................................................................................................... 19

Table 9. Shutdown State of VBIAS vs. Configuration Bits ................................................................................................................. 19

Table 10. Shutdown state of VMOD vs. Configuration bits ................................................................................................................ 19

Fault Comparators ................................................................................................................................................................................ 20

Figure 8. Fault Comparator Logic ....................................................................................................................................................... 20

Duty-Cycle Limiting ............................................................................................................................................................................... 20

Temperature Measurement .................................................................................................................................................................. 20

Diode Faults ........................................................................................................................................................................................... 20

Figure 9. Saturation Detector .............................................................................................................................................................. 21

Figure 10. RXLOS Comparator Logic ................................................................................................................................................. 21

Temperature Compensation ................................................................................................................................................................ 21

Table 11. Temperature Compensation Look-up Tables, Serial Address I2CADR + 4h .................................................................... 22

M9999-101204

October 2004

MIC3000

Micrel

Table 12. APC Temperature Compensation Look-Up Table, Serial Address I2CADR+4h ............................................................... 23

Table 13. VMOD Temperature- Compensation Look-Up Table, Serial Address I2CADR+4h .......................................................... 23

Table 14. IBIAS Comparator Temperature Compensation Look-up Table, Serial Address I2CADR+4h ......................................... 23

Table 15. Bias Current High Alarm Temperature Compensation Table, Serial Address I2CADR+4h .............................................. 23

Table 16. Range of Temperature Compensation Tables vs. LUTOFF .............................................................................................. 24

Figure 11. Examples of LUTOFF Operation ....................................................................................................................................... 24

Figure 12. Temperature Compensation Examples ............................................................................................................................. 25

Alarms and Warning Flags ................................................................................................................................................................... 26

Table 17. MIC3000 Events ................................................................................................................................................................. 26

Control and Status I/O .......................................................................................................................................................................... 26

Figure 13. Control and Status I/O Logic .............................................................................................................................................. 27

System Timing ....................................................................................................................................................................................... 27

Figure 14. Transmitter ON-OFF Timing .............................................................................................................................................. 27

Figure 15. Initialization Timing with TXDISABLE Asserted ................................................................................................................ 27

Figure 16. Initialization Timing, TXDISABLE Not Asserted ................................................................................................................ 28

Figure 17. Loss-of-Signal (LOS) Timing ............................................................................................................................................. 28

Figure 18. Transmit Fault Timing ........................................................................................................................................................ 28

Figure 19. Successfully Clearing a Fault Condition ............................................................................................................................ 29

Figure 20. Unsuccessful Attempt to Clear a Fault .............................................................................................................................. 29

Warm Resets .......................................................................................................................................................................................... 30

Power-On Hour Meter ........................................................................................................................................................................... 30

Table 18. Power-On Hour Meter Result Format ................................................................................................................................. 30

Test and Calibration Features ............................................................................................................................................................. 30

Table 19. Test and Diagnostic Features ............................................................................................................................................. 30

Serial Port Operation ............................................................................................................................................................................ 31

Figure 21. Write Byte Protocol ............................................................................................................................................................ 31

Figure 22. Read Byte Protocol ............................................................................................................................................................ 31

Figure 23. Read_Word Protocol .......................................................................................................................................................... 31

Page Writes ............................................................................................................................................................................................ 31

Figure 24. Four-Byte Page_Write Protocol ......................................................................................................................................... 32

Acknowledge Polling ............................................................................................................................................................................ 32

Write Protection and Data Security ..................................................................................................................................................... 32

User Password ....................................................................................................................................................................................... 32

Detailed Register Descriptions ............................................................................................................................................................ 33

Alarm Threshold Registers .................................................................................................................................................................. 33

Warning Threshold Registers .............................................................................................................................................................. 38

ADC Result Registers ........................................................................................................................................................................... 44

Alarm Flags ............................................................................................................................................................................................ 47

Warning Flags ........................................................................................................................................................................................ 48

Applications Information ...................................................................................................................................................................... 61

Controlling Laser Diode Bias ............................................................................................................................................................... 61

Figure 25. Example APC Circuit for Common-Cathode TOSA .......................................................................................................... 61

Figure 26. Example APC Circuit for Common Anode TOSA .............................................................................................................. 61

Choosing CCOMP ................................................................................................................................................................................. 62

Figure 27. Slew Rate vs. CCOMP Value ............................................................................................................................................ 62

Figure 28. Open Loop Unity-Gain Bandwidth vs. CCOMP ................................................................................................................. 62

Table 20. Typical Values for CCOMP ................................................................................................................................................. 62

Measuring Laser Bias Current ............................................................................................................................................................. 62

Interfacing To Laser Drivers ................................................................................................................................................................ 63

SY88912 3.3V 3.2Gbps SONET/SDH Laser Driver ............................................................................................................................. 63

Figure 29. Controlling the SY88912 Modulation Current .................................................................................................................... 63

October 2004

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MIC3000

Micrel

Table 21. Control Range of SY88912 Modulation Control Circuit ...................................................................................................... 63

SY88932 3.3V 3.2Gbps SONET/SDH Laser Driver ............................................................................................................................. 63

Figure 30. Controlling the SY88932 Modulation Current .................................................................................................................... 63

SY89307 5.0V/ 3.3V 2.5Gbps VCSEL Driver ....................................................................................................................................... 64

Figure 31. Controlling the SY89307 Modulation Current .................................................................................................................... 64

Laser Drivers Programmed via a Sink Current .................................................................................................................................. 64

Figure 32. Controlling the Modulation Current via a Sink Current ...................................................................................................... 64

Drivers With Monitor Outputs .............................................................................................................................................................. 64

Shutdown Output .................................................................................................................................................................................. 64

Figure 33. Redundant Switch Circuits ................................................................................................................................................. 65

Temperature Sensing ............................................................................................................................................................................ 65

Table 23. Contributors to Self-Heating ................................................................................................................................................ 65

Remote Sensing .................................................................................................................................................................................... 65

Table 22. Transistors Suitable for Use as Remote Diodes ................................................................................................................ 65

Minimizing Errors .................................................................................................................................................................................. 65

Self-Heating ............................................................................................................................................................................................ 65

Series Resistance with External Temperature Sensor ..................................................................................................................... 66

XPN Filter Capacitor Selection ............................................................................................................................................................ 66

XPN Layout Considerations ................................................................................................................................................................. 66

Figure 34. Guard Traces and Kelvin Return for Remote Thermal Diode ........................................................................................... 66

Layout Considerations ......................................................................................................................................................................... 66

Small Form-Factor Pluggable (SFP) Transceivers ............................................................................................................................ 66

Figure 35. Typical SFP Control and Status I/O Signal Routing (not to scale) ................................................................................... 66

Power Supplies ...................................................................................................................................................................................... 67

Figure 36. Power Supply Routing and Bypassing .............................................................................................................................. 67

Using The MIC3000 In a 5V System .................................................................................................................................................... 67

Package Information ............................................................................................................................................................................. 68

24-Pin MLF

(ML) ................................................................................................................................................................................ 68

M9999-101204

October 2004

MIC3000 Related Products

	MIC3000	MIC3000BML	MIC3000_11	MIC3000BML-TR	MIC3000BMLTR
Description	FOM Management IC	FOM Management IC	FOM Management IC	IC TXRX OPTICAL MANAGEMENT 24MLF	Support Circuit, 1-Func, 4 X 4 MM, MLF-24

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