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