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ADT7476AARQZ-R Datasheet(PDF) 40 Page - ON Semiconductor |
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ADT7476AARQZ-R Datasheet(HTML) 40 Page - ON Semiconductor |
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40 / 69 page  ADT7476A www.onsemi.com 40 Step 3 − 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, which can be programmed in 1 °C increments. A TMIN register is associated with each temperature measurement channel: Remote 1, local, and Remote 2 temperature. Once the TMIN value is exceeded, the fan turns on and runs at the minimum PWM duty cycle. The fan turns off once the temperature has dropped below TMIN − THYST. To overcome fan inertia, the fan is spun up until two valid TACH rising edges are counted. See the Fan Startup Timeout section for more details. In some cases, primarily for psycho-acoustic reasons, it is desirable that the fan never switch off below TMIN. Setting Bits [7:5] of Enhance Acoustics Register 1 (0x62) keeps the fans running at the PWM minimum duty cycle if the temperature should fall below TMIN. Table 44. TMIN REGISTERS Register Description Default 0x67 Remote 1 Temperature TMIN 0x5A (90 °C) 0x68 Local Temperature TMIN 0x5A (90 °C) 0x69 Remote 2 Temperature TMIN 0x5A (90 °C) Enhance Acoustics Register 1 (0x62) Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when temperature is below TMIN – THYST. Bit 7 (MIN3) = 1, PWM3 runs at PWM3 minimum duty cycle below TMIN – THYST. Bit 6 (MIN2) = 0, PWM2 is off (0% PWM duty cycle) when temperature is below TMIN – THYST. Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty cycle below TMIN – THYST. Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when temperature is below TMIN – THYST. Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty cycle below TMIN – THYST. Figure 53. Understanding the TMIN Parameter THERMAL CALIBRATION REMOTE1 = AMBIENT TEMP 100% 0% TMIN TRANGE PWM MIN MUX S TACHOMETER1 MEASUREMENT S S PWM MIN PWM MIN THERMAL CALIBRATION 100% 0% TMIN TRANGE THERMAL CALIBRATION 100% 0% TMIN TRANGE LOCAL = VRM TEMP REMOTE2 = CPU TEMP TACHOMETER2 MEASUREMENT RAMP CONTROL (ACOUSTIC ENHANCEMENT) TACHOMETER3 AND 4 MEASUREMENT PWM CONFIG PWM GENERATOR PWM1 PWM2 PWM3 TACH3 TACH2 TACH1 CPU FAN SINK FRONT CHASSIS REAR CHASSIS RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM CONFIG PWM GENERATOR PWM CONFIG PWM GENERATOR TMIN 100% 0% |
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