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ADT7490ARQZ-R7 データシート(PDF) 36 Page - ON Semiconductor |
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ADT7490ARQZ-R7 データシート(HTML) 36 Page - ON Semiconductor |
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36 / 75 page  ADT7490 http://onsemi.com 36 Figure 49. Understanding the TMIN Parameter 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 MIN PWM MIN 100% RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT TACHOMETER 1 MEASUREMENT TACHOMETER 2 MEASUREMENT PWM GENERATOR PWM CONFIG PWM CONFIG PWM CONFIG 0% 100% TMIN Step 4: PWMMIN for Each PWM (Fan) Output PWMMIN is the minimum PWM duty cycle at which each fan in the system runs. It is also the start speed for each fan under automatic fan control once the temperature rises above TMIN. For maximum system acoustic benefit, PWMMIN should be as low as possible. Depending on the fan used, the PWMMIN setting is usually in the 20% to 33% duty cycle range. This value can be found through fan validation. Figure 50. PWMMIN Determines Minimum PWM Duty Cycle TEMPERATURE TMIN 100% PWMMIN 0% More than one PWM output can be controlled from a single temperature measurement channel. For example, Remote 1 temperature can control PWM1 and PWM2 outputs. If two different fans are used on PWM1 and PWM2, the fan characteristics can be set up differently. As a result, Fan 1 driven by PWM1 can have a different PWMMIN value than that of Fan 2 connected to PWM2. Figure 51 illustrates this as PWM1MIN (front fan) turned on at a minimum duty cycle of 20%, while PWM2MIN (rear fan) is turned on at a minimum of 40% duty cycle. Note that both fans turn on at exactly the same temperature, defined by TMIN. |
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