October 2004

3

M9999-101204

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