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EMC2113 データシート(PDF) 68 Page - Microchip Technology |
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EMC2113 データシート(HTML) 68 Page - Microchip Technology |
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68 / 88 page  RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown Datasheet DS20005251A-page 68 2013 Microchip Technology Inc. ‘1’ - The Look Up Table entries are locked and cannot be updated. The Look Up Table is fully active and will be used based on the loaded values. The PWM output will be updated depending on the temperature and / or TACH variations. APPLICATION NOTE: When the LUT_LOCK bit is set at a logic ‘0’, the PWM drive setting will be set at whatever value was last used by the RPM-based Fan Speed Control Algorithm or the Look Up Table. Bit 4 - RPM / PWM - This bit selects the data format for the LUT drive settings. ‘0’ (default) - The Look Up Table drive settings are RPM TACH count values for use by the RPM- based Fan Speed Control Algorithm. The Look Up Table drive settings should be loaded highest value to lowest value (to coincide with the inversion between TACH counts and actual RPM). ‘1’ - The Look Up Table drive settings are PWM duty cycle values and are used directly. The drive settings should be loaded lowest value to highest value. Bit 3 - PUSH1_CFG - Determines whether the PWM Input duty cycle is used instead of the Pushed 1 Temperature data when the TEMP1_CFG bit is set. ‘0’ (default) - The Pushed Temperature 1 register can be written via the SMBus and will hold a temperature value. The PWM Input Duty cycle is not used. ‘1’ - If the TEMP1_CFG or TEMP3_CFG bit is set, the PWM Input Duty cycle will be used. The Pushed Temperature 1 register can be written via the SMBus and will hold a temperature value but will not be used. APPLICATION NOTE: If the Pushed Temperature 1 data is configured to hold the PWM input duty cycle and is used in the Look Up Table, then the Look Up Table threshold levels must be programmed in the same format as the PWM input duty cycle - see Section 7.5 and Section 7.35. Bit 2 - TEMP1_CFG - Determine the temperature channel that is used for the Temperature 1 inputs to the Look Up Table. ‘0’ (default) - The External Diode 1 channel is used by the Fan Look Up Table. ‘1’ - Either the data written into the Pushed Temperature 1 Register or the data in the PWM Input Duty Cycle register is used by the Fan Look Up table as determined by the PUSH1_CFG bit. Bit 1 - TEMP3_CFG - Determine the temperature channel that is used for the Temperature 3 inputs to the Look Up Table. ‘0’ (default) - The External Diode 3 channel is used by the Fan Look Up Table (if enabled). ‘1’ - Either the data written into the Pushed Temperature 1 Register or the data in the PWM Input Duty Cycle register is used by the Fan Look Up table as determined by the PUSH1_CFG bit. Bit 0 - TEMP4_CFG - Determine the temperature channel that is used for the Temperature 4 inputs to the Look Up Table. ‘0’ (default) -The Internal diode channel is used by the Fan Look Up Table. ‘1’ - The data written into the Pushed Temperature 2 Register is used by the Fan Look Up Table. 7.35 Look Up Table Registers Table 7.52 Look Up Table Registers ADDR R/W REGISTER RPM / PWM B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 51h R/W LUT Drive Setting 1 ‘0’ 4096 2048 1024 512 256 128 64 32 FBh ‘1’ 128 64 32 16 8 4 2 1 |
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