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Fan Speed Control with the EMC2102 Device
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Copyright © 2007 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information
sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility
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Fan Speed Control with the EMC2102 Device Table of Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 The Evaluation System. .
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Fan Speed Control with the EMC2102 Device 6.2.8 Using the Tested Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 3
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Fan Speed Control with the EMC2102 Device List of Figures Figure 4.1 EMC2102 Fan Control Evaluation System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4.2 EVB-EMC2102 Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 5.1 ChipMan Message for First Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 5.2 ChipMan Device Selectio
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Fan Speed Control with the EMC2102 Device List of Tables Table 5.1 Register Change Summary for Experiment 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 5.2 Register Change Summary for Experiment 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 5.3 Register Change Summary for Experiment 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 5.4 Register Change Summary for Experiment 7 . . .
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Fan Speed Control with the EMC2102 Device 1 Overview SMSC has introduced a series of Environmental Monitoring and Control (EMC) devices with integrated fan control. This fan controller family devices feature the advanced closed-loop fan control technology developed by SMSC’s engineering team. This user manual provides detailed information about fan control features supported by one of those EMC devices -- EMC2102, with detailed hand-on experiments for configuring the devices in real applicatio
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Fan Speed Control with the EMC2102 Device USB Cable PC w/ ChipMan Software EVB-EMC2102 Figure 4.1 EMC2102 Fan Control Evaluation System Figure 4.2 EVB-EMC2102 Board SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 7
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Fan Speed Control with the EMC2102 Device 5 Basic Operation Experiments In this chapter basic operation experiments will be provided to help users to get familiar with the system. 5.1 Experiment 1 - Manual Fan Control This experiment is designed to gain familiarity with both the EMC2102 device, and the application software, ChipMan. The ChipMan application can be used to configure the EMC2102 device and to monitor the status of the device. It includes tools to capture and plot data at rates
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Fan Speed Control with the EMC2102 Device in Figure 5.4, "ChipMan Operation Window". Click on the HWM icon to show the different windows available. The EMC2102 WatchDog will have timed out at this point, and the on-board DC fan will be running at 100%. Note: Starting the ChipMan application without the USB cable/EVB connected to the PC, an error message "Supported company ID on device not found" will pop-up. Plug in the USB cable and click on “Abort”, another pop-up window will ask if you wa
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Fan Speed Control with the EMC2102 Device Figure 5.3 Selecting the Device and Master Controller Type Figure 5.4 ChipMan Operation Window Revision 0.2 (09-17-07) USER MANUAL SMSC EMC2102 10
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Fan Speed Control with the EMC2102 Device Notes: 1. The EVB-EMC2102 needs to be configured using the USB SMBus Bridge to work properly. If in the device selection window the Master Controller type is set to I/O Controller Hub then the "Supported company ID on device not found" message will pop-up again. 2. Disconnecting the USB cable and reconnecting it without restarting the ChipMan may cause register reading errors (all zeros). This problem can be cleared by re-selecting the EMC2102 device t
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Fan Speed Control with the EMC2102 Device Figure 5.5 Changing Fan Speed 5.1.3 Plotting From ChipMan The ChipMan software has the ability to plot register values in real-time, up to 10Hz continuous rate. To select a register to plot, highlight its name or value, and right-click. A menu with a single entry "Add register to Plot" will appear (Figure 5.6, "Plotting from the ChipMan"). Click the entry then a plot window should appear, with a legend on top. When additional registers with the same da
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Fan Speed Control with the EMC2102 Device Figure 5.7 Plot Windows The two plots shown in Figure 5.8, "Plot Examples" are in sync. If the scaled data is desired for analysis or archival, the data may be stored in a semi-colon separated text file from each of the plot windows. Simply select File Export, and enter a filename in the Save window. TACH Target (57h) Fan Driver Setting (51h) TACH Reading (58h) Figure 5.8 Plot Examples 5.2 Experiment 2 - RPM Based Closed-Loop Fan Control The experime
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Fan Speed Control with the EMC2102 Device 5.2.2 Basic RPM Based Fan Control The EMC2102 defaults will enable closed-loop operation. Prior to other options, examine the various parameters on ChipMan window page 3: Fan Settings. The registers of most interest are the FAN Minimum Drive (55h), and Valid Tach Count (56h). The closed-loop controller will not drive below the minimum drive value, and will not respond to a TACH Target RPM speed less than the speed defined by the Valid Tach Count regist
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Fan Speed Control with the EMC2102 Device Fan was covered The cover was removed Figure 5.10 Effects of Loading 5.2.4 Register Change Summary Table 5.1, "Register Change Summary for Experiment 2" lists all register value changes from the default cmf load to accomplish the tests. Table 5.1 Register Change Summary for Experiment 2 REGISTER DEFAULT NEW NAME ADDRESS VALUE VALUE COMMENT Fan 52h 4Bh CBh Enables the RPM based closed-loop fan Configuration control Algorithm (0100 1011b) (1100 1011b)
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Fan Speed Control with the EMC2102 Device 5.3 Experiment 3 - Spin-up Configuration Options This experiment is designed to gain familiarity with the various spin-up options available in the EMC2102 devices. This experiment will discuss the effects of Spin-Up Time and Spin-Up Levels. These parameters are important to ensure a valid start, while minimizing the turn-on overshoot for initial low RPM settings. (More examples regarding these two parameters can be found in Section 5.7.1, "Repetitious
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Fan Speed Control with the EMC2102 Device the 60% drive the register 51h value is 153d or 99h, and for 75% it is 191d or BFh. Those two drive settings will run a DC fan at two different speeds and we will call them rpm60 and rpm75. Depending on the fan, the speed for the same drive setting will vary. All data and plot examples in this document were taken using an EVB-EMC2102 board with the on- board DC fan. This fan has an rpm60 of 4500 rpm, and an rpm75 of 5650 rpm. 5.3.2 Getting Started For
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Fan Speed Control with the EMC2102 Device Invalid TACH Count Figure 5.13 60% Spin Level Setting Note: When a fan starts, the first TACH count captured by the EMC2102 may not reflect the fan’s speed correctly, since the counting clock (32.768 kHz) could only partially fill the counting window, which will cause a higher speed reading. Also for some fans, the tachometer may not work immediately after the fan starts therefore some invalid TACH signals (very short, noisy pulses) could be sent out a
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Fan Speed Control with the EMC2102 Device 5.3.6 Register Change Summary Table 5.2, "Register Change Summary for Experiment 3" lists all register value changes from the default cmf load to accomplish the tests. Table 5.2 Register Change Summary for Experiment 3 REGISTER DEFAULT NEW NAME ADDRESS VALUE VALUE COMMENT FAN Spin Up 53h 01h 03h SPINUP_TIME of 2.0 sec Configuration (00000001b) 05h Change the LEVEL from 60% to 75% SMSC EMC2102 USER MANUAL Revision 0.2 (09-17-07) 19
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Fan Speed Control with the EMC2102 Device 5.4 Experiment 4 - RPM Drive Mode Rate Controls This experiment is designed to gain familiarity with the rate control options available in the EMC2102 devices. This experiment will discuss the effects of Maximum Fan Step and Update rate that can be used to control the ramp rate of a fan. The two parameters ensure the fan reaches the desired drive in a reasonable time with no oscillations. The CMF file for this experiment is the same as for Experiment
