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Zakładka z wyszukiwarką danych komponentów |
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ADT7467ARQZ-R7 Arkusz danych(PDF) 43 Page - ON Semiconductor |
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ADT7467ARQZ-R7 Arkusz danych(HTML) 43 Page - ON Semiconductor |
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43 / 77 page  ADT7467 Rev. 3 | Page 43 of 77 | www.onsemi.com 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 TACHOMETER 1 MEASUREMENT PWM CONFIG PWM MIN RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR TACHOMETER 2 MEASUREMENT PWM CONFIG PWM MIN RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT PWM CONFIG PWM MIN RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR 100% 0% 100% TMIN Figure 57. Understanding the TMIN Parameter STEP 4: PWMMIN FOR PWM (FAN) OUTPUTS PWMMIN is the minimum PWM duty cycle at which each fan in the system runs. It is also the start speed for each fan in automatic fan control mode when 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. TEMPERATURE TMIN 100% PWMMIN 0% Figure 58. PWMMIN Determines Minimum PWM Duty Cycle 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 fans are used on PWM1 and PWM2, each fan’s 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. In Figure 59, PWM1MIN (front fan) is turned on at a minimum duty cycle of 20%, and PWM2MIN (rear fan) turns on at a mini- mum of 40% duty cycle; however, both fans turn on at the same temperature, defined by TMIN. TEMPERATURE TMIN 100% PWM1MIN 0% PW M1 PW M2 PWM2MIN Figure 59. Operating Two Fans from a Single Temperature Channel |
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