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ADT7467ARQZ-REEL Datasheet(PDF) 10 Page - ON Semiconductor |
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ADT7467ARQZ-REEL Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 77 page  ADT7467 Rev. 3 | Page 10 of 77 | www.onsemi.com Configuration Register 5 Bit 0: If Bit 0 is set to 1, the ADT7467, in terms of temperature, is backward compatible with the ADT7460. Measurements, including TMIN calibration circuit and fan control, work in the range −127°C to +127°C. In addition, care should be taken in reprogramming the temperature limits (TMIN, operating point, THERM) to their desired twos complement value, because the power-on default for them is at Offset 64. The extended temperature range is −64°C to 191°C. The default is 1, which is in the −64°C to +191°C temperature range. Bit 1 = 0 is the high frequency (22.5 kHz) fan drive signal. Bit 1 = 1 switches the fan drive to low frequency PWM, programmable between 10 Hz and 100 Hz, the same as the ADT7460. The default is 0, or HF PWM. Bit 2 sets the direction for the GPIO: 0 = input, 1 = output. Bit 3 sets the GPIO polarity: 0 = active low, 1 = active high. Setting the Functionality of Pin 9 Pin 9 on the ADT7467 has four possible functions: SMBALERT, THERM, GPIO, and TACH4. The user chooses the required functionality by setting Bit 0 and Bit 1 of Configuration Register 4 at Address 0x7D. Table 4. Pin 9 Settings Bit 1 Bit 0 Function 0 0 TACH4 0 1 THERM 1 0 SMBALERT 1 1 GPIO RECOMMENDED IMPLEMENTATION Configuring the ADT7467 as in Figure 15 allows the system designer to use the following features: • Two PWM outputs for fan control of up to three fans (the front and rear chassis fans are connected in parallel). • Three TACH fan speed measurement inputs. • VCC measured internally through Pin 3. • CPU temperature measured using the Remote 1 temperature channel. • Ambient temperature measured through the Remote 2 temperature channel. • Bidirectional THERM pin. This feature allows Intel Pentium 4 PROCHOT monitoring and can function as an overtemperature THERM output. Alternatively, it can be programmed as an SMBALERT system interrupt output. CPU FAN CPU ICH TACH2 PWM3 TACH3 D1+ D1– GND ADT7467 SCL SDA D2+ D2– TACH1 PWM1 AMBIENT TEMPERATURE SMBALERT THERM PROCHOT FRONT CHASSIS FAN REAR CHASSIS FAN Figure 15. ADT7467 Configuration |
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