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ADT7476AARQZ-R Datasheet(PDF) 38 Page - ON Semiconductor |
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ADT7476AARQZ-R Datasheet(HTML) 38 Page - ON Semiconductor |
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38 / 69 page  ADT7476A www.onsemi.com 38 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 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 MUX |
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