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ADT7476ARQZ-R7 Datasheet(PDF) 36 Page - ON Semiconductor |
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ADT7476ARQZ-R7 Datasheet(HTML) 36 Page - ON Semiconductor |
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36 / 67 page  ADT7476 http://onsemi.com 36 Step 2—Configuring the Mux After the system hardware configuration is determined, 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, manually (under software control), or 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 0x5C, Register 0x5D, and Register 0x5E (PWM configuration registers) control the behavior of the fans connected to the PWM1, PWM2, and PWM3 outputs. The values selected for these bits determine how the mux connects a temperature measurement channel to a PWM output. Automatic Fan Control Mux Options [7:5] (BHVR), Register 0x5C, Register 0x5D, Register 0x5E. 000 = Remote 1 temperature controls PWMx 001 = Local temperature controls PWMx 010 = Remote 2 temperature controls PWMx 101 = Fastest speed calculated by local and Remote 2 temperature controls PWMx 110 = Fastest speed calculated by all three temperature channels controls PWMx 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 would be the fan turning on when Remote 1 temperature exceeds 60 °C or if the local temperature exceeds 45 °C. Other Mux Options [7:5] (BHVR), Register 0x5C, Register 0x5D, Register 0x5E. 011 = PWMx runs full speed 100 = PWMx disabled (default) 111 = Manual mode. PWMx is running under software control. In this mode, PWM current duty cycle registers (0x30 to 0x32) are writable and control the PWM outputs. Figure 51. 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 PWM MIN PWM MIN PWM MIN 100% PWM GENERATOR PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT TACHOMETER 1 MEASUREMENT TACHOMETER 2 MEASUREMENT RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR PWM CONFIG PWM CONFIG PWM CONFIG |
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