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ADT7462ACPZ-R7 データシート(PDF) 33 Page - ON Semiconductor |
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ADT7462ACPZ-R7 データシート(HTML) 33 Page - ON Semiconductor |
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33 / 81 page  ADT7462 http://onsemi.com 33 Figure 51. Automatic Fan Control Block Diagram MUX THERMAL CALIBRATION 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE REMOTE 1 TEMP LOCAL TEMP REMOTE 2 TEMP TACHOMETER 1 MEASUREMENT PWM CONFIG PWM MIN PWM1 RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR TACHOMETER 2 MEASUREMENT PWM CONFIG PWM MIN PWM2 RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT PWM CONFIG PWM MIN PWM3 RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR 100% TACH1 TACH2 TACH3 Step 1—Configuring the MUX First, the user needs to decide how many temperature channels are being measured and how many fans need to be controlled and monitored. When these decisions have been made, the fans can be assigned to particular temperature channels. Not only can fans be assigned to individual channels, but the behavior of the fans is also configurable. For example, fans can be run under automatic fan control; they can be run manually (under software control) or they can be run at the fastest speed calculated by multiple temperature channels. The MUX is the bridge between temperature measurement channels and the three PWM outputs. Bits [7:5] (BHVR) of Register 0x21, Register 0x22, Register 0x23, and Register 0x24 (PWM configuration registers) control the behavior of the fans connected to the PWM1, PWM2, PWM3, and PWM4 outputs. The values selected for these bits determine how the MUX connects a temperature measurement channel to a PWM output (see Figure 52). Automatic Fan Control MUX Options Bits [7:5] (BHVR), of Register 0x21, Register 0x22, Register 0x23, and Register 0x24, control the behavior of the corresponding PWM outputs (see Table 57 and Table 58). The fastest speed calculated options pertain to controlling one PWM output based on multiple temperature channels. The thermal characteristics of the three temperature zones can be set to drive a single fan. An example is the fan turning on when the Remote 1 temperature exceeds 60 °C or when the local temperature exceeds 45 °C. Step 2—TMIN Settings for Thermal Calibration Channels TMIN is the temperature at which the fans start to turn on under automatic fan control. The speed at which the fan runs at TMIN is programmed later. The TMIN values chosen are temperature channel−specific; for example, 25 °C for ambient channel, 30 °C for VRM temperature, and 40°C for processor temperature. TMIN is an 8−bit value, either twos complement or Offset 64, that can be programmed in 1 °C increments. There is a TMIN register associated with each temperature measurement channel: local, Remote 1, Remote 2, and Remote 3. When the TMIN value is exceeded, the fan turns on and runs at the minimum PWM duty cycle. The fan turns off after the temperature has dropped below TMIN − THYST. |
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