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EMC2103 Datasheet(PDF) 62 Page - SMSC Corporation |
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EMC2103 Datasheet(HTML) 62 Page - SMSC Corporation |
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62 / 84 page  RPM-Based Fan Controller with HW Thermal Shutdown Datasheet Revision 0.85 (01-29-08) 62 SMSC EMC2103 DATASHEET 6.30 TACH Target Register The TACH Target Register holds the target tachometer value that is maintained by the RPM based Fan Speed Control Algorithm. The value in the TACH Target Register will always reflect the current TACH Target value. If the Look Up Table is active and configured to operate in RPM Mode, then this register will be read only. Writing to this register will have no affect and the data will not be stored. If the algorithm is enabled then setting the TACH Target Register to FFh will disable the fan driver (set the PWM duty cycle to 0%). Setting the TACH Target to any other value (from a setting of FFh) will cause the algorithm to invoke the Spin Up Routine after which it will function normally. 6.31 TACH Reading Register The TACH Reading Register contents describe the current tachometer reading for the fan. By default, the data represents the fan speed as the number of 32kHz clock periods that occur for a single revolution of the fan. Equation [3] shows the detailed conversion from TACH measurement (COUNT) to RPM while Equation [4] shows the simplified translation of TACH Reading Register count to RPM assuming a 2-pole fan, measuring 5 edges, with a frequency of 32.768kHz. See Appendix B for a table enumerating the RPM to TACH conversion for the default settings. Table 6.46 TACH Target Register ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 4Ch R/W Fan TACH Target Low Byte 16 84 21 - - - F8h 4Dh R/W TACH Target 4096 2048 1024 512 256 128 64 32 FFh Table 6.47 TACH Reading Register ADDR R/W REGISTER B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 4Eh R Fan TACH 4096 2048 1024 512 256 128 64 32 FFh 4Fh R Fan TACH Low Byte 16 84 21 - - - F8h |
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