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EMC2103 Datasheet(PDF) 78 Page - SMSC Corporation |
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EMC2103 Datasheet(HTML) 78 Page - SMSC Corporation |
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78 / 84 page  RPM-Based Fan Controller with HW Thermal Shutdown Datasheet Revision 0.85 (01-29-08) 78 SMSC EMC2103 DATASHEET A.2 Example #2 This example uses the RPM based Fan Speed Control Algorithm. The Spin Level (used by the Spin Up Routine) should be changed to 50% drive for a total Spin Time of 1 second. For all other RPM configuration settings, the default conditions are used. For control inputs, it uses the External Diode 1 channel normally, the External Diode 2 channel normally, and both Pushed Temperature registers in DTS format. The configuration is set as shown in Table A.5 while Table A.6 shows how the table is loaded. Note that when using DTS data, the USE_DTS_F1 and / or USE_DTS_F2 bits should be set. The Pushed Temperature Registers are loaded with the normal DTS values as received by the processor. When the DTS value is used by the Look Up Table, the value that is stored in the Pushed Temperature Register is subtracted from a fixed temperature of 100°C. This resultant value is then compared against the Look Up Table thresholds normally. When programming the Look Up Table, it is necessary to take this translation into account or else incorrect settings may be selected. Table A.5 Look Up Table Example #2 Configuration ADDR REGISTER B7 B6 B5 B4 B3 B2 B1 B0 SETTING 42h Fan 1 Configuration 1 EN_ ALGO RANGE[1:0] EDGES[1:0] UPDATE[2:0] CBh 1 1 0 0 101 1 46h Fan 1 Spin Up Configuration DRIVE_FAIL_CNT1 [1:0] NOKICK 1 SPIN_LVL[2:0] SPINUP_TIME [1:0] 0Ah 0 0 0 0 101 0 50h LUT 1 Configuration USE_DT S_F1 USE_D TS_F2 LUT_LO CK RPM / PWM - TEMP3 _CFG TEMP 3_CFG E5h 1 1 1 0 010 1 Table A.6 Fan Speed Control Table Example #2 FAN SPEED STEP # EXTERNAL DIODE 1 TEMPERATURE (CPU) EXTERNAL DIODE 2 TEMPERATURE (GPU) PUSHED TEMPERATURE SETTING (DTS1) PUSHED TEMPERATURE SETTING (DTS2) TACH TARGET 135oC65oC50oC40oC 3Dh (1007 RPM) 240oC75oC55oC45oC 1Eh (2048 RPM) 350oC85oC60oC50oC 14h (3072 RPM) 460oC90oC65oC55oC 0Fh (4096 RPM) 570oC95oC70oC60oC 0Ch (5120 RPM) 680oC 100oC75oC65oC 0Ah (6144 RPM) |
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