MIC3000 Datasheet, PDF (3/68 Pages) Micrel Semiconductor – SFP Management IC

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
3
M9999-101204