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ADT7462ACPZ-R7 データシート(PDF) 34 Page - ON Semiconductor |
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ADT7462ACPZ-R7 データシート(HTML) 34 Page - ON Semiconductor |
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34 / 81 page  ADT7462 http://onsemi.com 34 Figure 52. Assigning Temperature Channels to Fan Channels MUX REAR CHASSIS FRONT CHASSIS CPU FAN SINK REMOTE 1 = AMBIENT TEMP LOCAL = VRM TEMP REMOTE 2 = CPU TEMP PWM1 PWM2 TACH1 TACH2 TACH3 PWM3 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% To overcome fan inertia, the fan is spun up until two valid TACH rising edges are counted. See the Fan Spin−Up section for more details. In some cases, primarily for psycho−acoustic reasons, the fan should never switch off below TMIN. The corresponding bits in Register 0x25 and Register 0x26 should be set to keep the fans running at the PWM minimum duty cycle, if the temperature falls below TMIN. TMIN Registers Register 0x5C, Local Temperature TMIN = 0x9A (90°C) Register 0x5D, Remote 1 Temperature TMIN = 0x9A (90°C) Register 0x5E, Remote 2 Temperature TMIN = 0x9A (90°C) Register 0x5F, Remote 3 Temperature TMIN = 0x9A (90°C) PWM1 and PWM2 Frequency Register (0x25) Bit 0 (MIN 1) = 0. PWM1 is off (0% PWM duty cycle) when temperature is below TMIN − THYST. Bit 0 (MIN 1) = 1. PWM1 runs at PWM1 minimum duty cycle below TMIN − THYST. Bit 1 (MIN 2) = 0. PWM2 is off (0% PWM duty cycle) when temperature is below TMIN − THYST. Bit 1 (MIN 2) = 1. PWM2 runs at PWM2 minimum duty cycle below TMIN − THYST. PWM3 and PWM4 Frequency Register (0x26) Bit 0 (MIN 3) = 0. PWM3 is off (0% PWM duty cycle) when temperature is below TMIN − THYST. Bit 0 (MIN 3) = 1. PWM3 runs at PWM3 minimum duty cycle below TMIN − THYST. Bit 1 (MIN 4) = 0. PWM4 is off (0% PWM duty cycle) when temperature is below TMIN − THYST. Bit 1 (MIN 4) = 1. PWM4 runs at PWM4 minimum duty cycle below TMIN − THYST. |
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