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ADT7490ARQZ-R7 Datasheet(PDF) 34 Page - ON Semiconductor |
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ADT7490ARQZ-R7 Datasheet(HTML) 34 Page - ON Semiconductor |
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34 / 75 page  ADT7490 http://onsemi.com 34 Figure 48. Automatic Fan Control Block Diagram REAR CHASSIS FRONT CHASSIS CPU FAN SINK LOCAL = VRM TEMP PWM1 PWM2 TACH1 TACH2 TACH3 PWM3 REMOTE 2 = GPU TEMP REMOTE 1 = AMBIENT TEMP 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% PECI = CPU TEMP THERMAL CALIBRATION 0% TMIN TRANGE 100% RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) RAMP CONTROL (ACOUSTIC ENHANCEMENT) PWM GENERATOR PWM GENERATOR TACHOMETER 3 AND 4 MEASUREMENT TACHOMETER 1 MEASUREMENT TACHOMETER 2 MEASUREMENT PWM GENERATOR PWM CONFIG PWM CONFIG PWM CONFIG Step 1: Hardware Configuration During system design, the motherboard sensing and control capabilities should be addressed early in the design stages. Decisions about how these capabilities are used should involve the system thermal/mechanical engineer. Ask the following questions: • What ADT7490 functionality is used? • PWM2 or SMBALERT? • TACH4 fan speed measurement or overtemperature THERM function? • 2.5 VIN voltage monitoring or overtemperature THERM function? The ADT7490 offers multifunctional pins that can be reconfigured to suit different system requirements and physical layouts. These multifunction pins are software programmable. • How many fans are supported in the system, three or four? This influences the choice of whether to use the TACH4 pin or to reconfigure it for the THERM function. • Is the CPU fan to be controlled using the ADT7490, or will the CPU fan run at full speed 100% of the time? If run at 100%, it frees up a PWM output, but the system is louder. • Where is the ADT7490 going to be physically located in the system? This influences the assignment of the temperature measurement channels to particular system thermal zones. For example, locating the ADT7490 close to the VRM controller circuitry allows the VRM temperature to be monitored using the local temperature channel. Step 2: Configuring the Muxtiplexer 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, can be run manually (under software control), or can be run 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, respectively. The values selected for these bits determine how the multiplexer connects a temperature measurement channel to a PWM output. |
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