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ADT7467ARQZ-R7 Datasheet(PDF) 40 Page - ON Semiconductor |
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ADT7467ARQZ-R7 Datasheet(HTML) 40 Page - ON Semiconductor |
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40 / 77 page  ADT7467 Rev. 3 | Page 40 of 77 | www.onsemi.com 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 run using automatic fan control, can run manually (using software control), or can run at the fastest speed calculated by multiple tempera- ture 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, and 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 option pertains 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 the Remote 1 temperature exceeds 60°C or when the local temperature exceeds 45°C. Other Mux Options <7:5> (BHVR), Register 0x5C, Register 0x5D, and Register 0x5E 011 = PWMx runs at full speed 100 = PWMx disabled (default) 111 = manual mode. PWMx is run using software control. In this mode, PWM duty cycle registers (Register 0x30 to Register 0x32) are writable and control the PWM outputs. 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% Figure 55. Assigning Temperature Channels to Fan Channels |
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