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SMSC EMC2102 manual

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  • Page 1

    Insert EVB graphic/photo here (this text can be removed on master page view) SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) Copyright © 2007 SMSC or its sub sidiaries. Al l rights rese rved. Circuit diagrams and other infor mation relating to SMSC product s are included as a means of il lustrating typical applications. C onsequently , complete i[...]

  • Page 2

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 2 T able of Content s 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 3

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 3 6.2.8 Using the Tested Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38[...]

  • Page 4

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 4 List of Figures Figure 4.1 EMC2102 Fan Control Evaluation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4.2 EVB-EMC2102 Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 5

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 5 List of T ables Table 5.1 Register Change Summary for Experiment 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 5.2 Register Change Summary for Experiment 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 6

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 6 1 Overview SMSC has introduced a serie s of Environmental Monitoring a nd Control (EMC) devices with integ rated fan control. This fan controller family devices f eature the advanced closed-loop fan con trol technology developed by SMSC’s engineering tea[...]

  • Page 7

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 7 Figure 4.1 EMC2102 F an Control Evaluation Syste m Figure 4.2 EVB-EMC2102 B oard USB Cable PC w/ Chi pMan Sof twar e EVB-EMC2102[...]

  • Page 8

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 8 5 Basic Operation Experiment s In this chapter ba sic operation exp eriments will be provided to help users to get familiar wi th the system. 5.1 Experiment 1 - Manual Fan Control This experiment is designed to ga in familiarity with both the EMC2102 devic[...]

  • Page 9

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 9 in Figure 5.4, "ChipMan Operati on Window" . Click o n the HWM icon to show the di fferent windows available. The EMC2102 W atchDog will have timed out at this point, and the on-board DC fan will be running at 100%. Note: S tarting the ChipMan ap[...]

  • Page 10

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 10 Figure 5.3 Selecting the Device and Master C ontroller T ype Figure 5.4 ChipMan Op eration Window[...]

  • Page 11

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 11 Notes: 1. The EVB-EMC2102 needs to be configured usin g the USB SMBus Bridge to work properly . If in the device selectio n window the Master Contro ller type is set to I/O Cont roller Hu b then the "Supported company ID on device not found" mes[...]

  • Page 12

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 12 5.1.3 Plotting From ChipMan The ChipMan software has the ability to plot regi ster value s in real-time, up to 10Hz contin uous rate. T o select a register to plot, highlight its name or va lue, and right-click. A men u with a single entry "Add regis[...]

  • Page 13

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 13 The two plots shown in Figure 5.8, "Plot Examples" are in sync. If the scaled dat a is desired for analysis or archival, the data may be stored in a se mi -colon separated text file from each of the plot windows. Simply select File Export, an d [...]

  • Page 14

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 14 5.2.2 Basic RPM Based Fan Control The EMC2102 defaults will enable cl osed-loop operatio n. Prior to other options, examine the vari ous parameters on ChipMan window p age 3: Fan Settings. The registers of most interest are th e F AN Minimum Drive (55h), [...]

  • Page 15

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 15 5.2.4 Register Change Summary T able 5.1, "Register Change Summary for Experiment 2" lists all register value cha nges from the default cmf load to accomplish the tests. Figure 5.10 Effe cts of Loading T able 5.1 Register Change Summary for Expe[...]

  • Page 16

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 16 5.3 Experiment 3 - Spin -up Configuration Options This experiment is designed to ga in familiari ty with the va rious spin-up o ptions available in the EMC2102 devices. This experiment will discuss the effects of S pin-Up T ime and S pin-Up Levels. These [...]

  • Page 17

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 17 the 60% drive the regi ster 51h value i s 153d or 99h, and for 75% it i s 191d or BFh. Tho se two drive settings will run a DC fan at two different speeds and we will cal l them rpm60 and rpm7 5. Depending on the fan, the speed for the same dri ve setting[...]

  • Page 18

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 18 Note: When a fan starts, the first T ACH count captured by the EMC2102 may not reflect the fan’s speed correctly , since the counti ng clock (32.768 kHz) coul d only part ially fill the coun ting window , which will cause a higher spee d reading. Also f[...]

  • Page 19

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 19 5.3.6 Register Change Summary T able 5.2, "Register Change Summary for Experiment 3" lists all register value cha nges from the default cmf load to accomplish the tests. T able 5.2 Register Change Summary for Experiment 3 REGISTER NAME ADDRESS D[...]

  • Page 20

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 20 5.4 Experiment 4 - RPM Drive Mode Rate Controls This experiment is designed to gain familiarity with the ra te control options available in the EMC2102 devices. This experiment will discuss the effects of Maximum Fan S tep and Upd ate rate that can be use[...]

  • Page 21

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 21 In the next experiment ( Figure 5.17, "Default UP DA TE with Different S tep Size Settings" ), two different maximum step sizes, 16 and 63, were used. with the 63 STEP SIZE setting, the output takes less steps (updates) from 4000 rpm to 7500 rpm[...]

  • Page 22

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 22 5.4.3 Register Change Summary T able 5.3, "Register Change Summary for Experiment 4" lists all register value cha nges from the default cmf load to accomplish the tests. Figure 5.18 Exceptional ly Slow Rate T able 5.3 Register Change Summary for[...]

  • Page 23

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 23 5.5 Experiment 5 - Opti mizing RPM Control Response This experiment is designed to gain familiarity wi th the parameters that affect the closed-loop controller implemented in the EMC2102. All these register s are located on the Fan Setting page in ChipMan[...]

  • Page 24

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 24 5.5.3 F AN Minimum Drive Register (55h) and V alid T ACH Count (56h) These two registers assist the user in defining the operational envi ronment for a given fan. The Minimum Drive register is an absolute minimum valu e the RPM controller may drive to in [...]

  • Page 25

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 25 5.5.4 Register Change Summary T able 5.4, "Register Change Summary for Experiment 7" lists all register value cha nges from the default cmf load to accomplish the tests. T able 5.4 Register Change Summary for Experiment 7 REGISTER NAME ADDRESS D[...]

  • Page 26

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 26 5.6 Experiment 6 - Limit s and Alert s This experiment is designed to gain familiarity wit h the control registers for generating fan related alarms and alerts associated with the EMC2 102. The CMF file for this experimen t is EMC2102_de fault.cmf. 5.6.1 [...]

  • Page 27

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 27 5.6.3 Register Change Summary All register values are default for the tests in this section. Figure 5.22 Fan Sp in and S t all Fan Dr ive Set t i ng (51h) Interr upt Status 2 (23h) TACH Target (57h) Stall TACH Reading (58h)[...]

  • Page 28

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 28 5.7 Experiment 7 - T roubleshooting 5.7.1 Repetitious S pin-up Routine Caused by Incorrect Settings At the end of spin-up routine (see Section 5.3.1, "Fan C ontrol Parameters" ), the EMC2102 checks the T ACH Reading register (58h). If the value [...]

  • Page 29

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 29 If the fan is already set to 75% level, we will need to lower the va lid speed (function of 56h, V alid T ACH) to a value below the rpm75, to fix the problem. T o test this situation, set spin -up level to 75 % (53h[2] = 1), se t the V alid T ACH Count (5[...]

  • Page 30

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 30 5.7.1.2 Case 2 - V alid RPM << T arget RPM < S pin-up Level RPM In this case, the ta rget speed is sma ller than t he spin-up level speed (rpm60 or rpm75) and is much bigger than the valid sp eed. The theoretica l plot of this situ ation is shown[...]

  • Page 31

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 31 5.7.1.3 Case 3 - V alid RPM =< T arget RPM << S pin-up Level RPM In this case, the target speed is only a little gr eater than the valid spe ed, and both of them are much smaller than the spin-up level speed (rpm60 or rpm75) . The theore tical pl[...]

  • Page 32

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 32 Using the EVB-EMC2102 to test th is situation with rpm75 (~5650 rpm), simply set the V alid T ACH register (56h) with 4500 rp m, set the UPDA TE (52h[2:0]) = 100ms an d start the fan with 4700 rpm, the spin-up routine starts over ‘and over ( Fig ure 5.3[...]

  • Page 33

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 33 5.7.1.4 Case 4 - 4.V alid RPM < Spin-up Level R P M ( r p m 6 0 o r r p m 7 5 ) < T a r g e t R P M In this case, the spin-up level speed (rpm60 or rpm75) is greater than the valid speed and smaller than the target speed, as shown in Figure 5.32, &q[...]

  • Page 34

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 34 5.7.1.5 Case 5 - Correct RPM Rela tions hip s with a Slow Response DC Fan In this case, the spin-up routine i s too short to make the fan reach a spee d highe r than the vali d sp eed. Since the EMC2102 cannot detect a valid T ACH at the en d of sp in-up [...]

  • Page 35

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 35 6 Appendix 6.1 DC Fan Basics - Poles, T ach Meter Pulses and Edges An n-pole fan has n pairs of Nort h-South magnetic poles which are ge nerated by electromagnet coil s. At anytime, only one p air of coils are d riven and which coil pair get s driven is d[...]

  • Page 36

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 36 Note: Although users can set the number of edges (in register 52h) to ei ther 3, 5, 7 or 9, it is strongly recommended using the default value 5 while driving a 2-pole DC fan. This equal to one complete fan revolution fo r a 2-pole fan. ChipMan translates[...]

  • Page 37

    Fan S peed Control with the EMC2102 Device SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 37  V erify the device is in Manu al Mode (52h[7] = 0) 6.2.2 Set the Correct LIMIT2K V alue  Register 52h (FAN Configuration) bit 6 (LIMIT2K ) is a fan dependent parameter as discussed in Section 5.5.2, "Fan Confi guration Register (52h)" . W[...]

  • Page 38

    Fan S peed Control with the EMC2102 Device Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 38 6.2.7 Determine the Spi n-up Levels (rpm60 and rpm75)  Drive the fan with 60% of the maximum outpu t (regi ster 51h = 99h) and the rpm value in the T ACH Reading register (58h) will be the fan’s rpm60  Drive the fan with 75% of the maximum ou tpu [...]