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40 / 75 page  ADT7490 http://onsemi.com 40 exceeding any TTHERM limit runs all fans at 100%, it has very negative acoustic effects. Ultimately, this limit should be set up as a fail−safe, and one should ensure that it is not exceeded under normal system operating conditions. Note that TTHERM limits are non−maskable and affect the fan speed no matter how automatic fan control settings are configured. This allows some flexibility, because a TRANGE value can be selected based on its slope, while a hard limit (such as 70 °C), can be programmed as TMAX (the temperature at which the fan reaches full speed) by setting TTHERM to that limit (for example, 70°C). THERM Registers Register 0x6A, Remote 1 THERM Temperature Limit = 0x64 (100 °C default) Register 0x6B, Local THERM Temperature Limit = 0x64 (100 °C default) Register 0x6C, Remote 2 THERM Temperature Limit = 0x64 (100 °C default) Register 0x3D, PECI TCONTROL Limit = 0x00 (0°C default) THERM Hysteresis THERM hysteresis on a particular channel is configured via the hysteresis settings in the following section (0x6D and 0x6E). For example, setting hysteresis on the Remote 1 channel also sets the hysteresis on Remote 1 THERM. Hysteresis Registers Register 0x6D, Remote 1, Local Hysteresis Register Bits [7:4], Remote 1 Temperature Hysteresis (4 °C default) Bits [3:0], Local Temperature Hysteresis (4 °C default) Register 0x6E, Remote 2, PECI Temperature Hysteresis Register Bits [7:4], Remote 2 Temperature Hysteresis (4 °C default) Bits [3:0], PECI Temperature Hysteresis (4 °C default) Because each hysteresis setting is four bits, hysteresis values are programmable from 1 °C to 15°C. It is not recommended that hysteresis values ever be programmed to 0 °C, because this disables hysteresis. In effect, this causes the fans to cycle (during a THERM event) between normal speed and 100% speed, or, while operating close to TMIN, between normal speed and off, creating unsettling acoustic noise. Figure 59. How TTHERM Relates to Automatic Fan Control TMIN 0% 100% TTHERM TRANGE REAR CHASSIS FRONT CHASSIS CPU FAN SINK LOCAL = VRM TEMP PWM1 PWM2 TACH1 TACH2 TACH3 PWM3 REMOTE 1 = AMBIENT TEMP REMOTE 2 = CPU TEMP MUX THERMAL CALIBRATION 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE PWM MIN PWM GENERATOR PWM MIN PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT PWM MIN TACHOMETER 1 MEASUREMENT TACHOMETER 2 MEASUREMENT RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR 100% PWM CONFIG PWM CONFIG PWM CONFIG |
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