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ADT7468 Datasheet(PDF) 11 Page - Analog Devices |
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ADT7468 Datasheet(HTML) 11 Page - Analog Devices |
11 / 80 page ADT7468 Rev. 0 | Page 11 of 80 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 ADT7463. The default = 0 = 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. HOW TO SET THE FUNCTIONALITY OF PIN 14 Pin 14 on the ADT7468 has four possible functions: SMBALERT, THERM, GPIO, and TACH4. The user chooses the required functionality by setting Bit 0 and Bit 1 of Configura- tion Register 4 at Address 0x7D. Table 4. Pin 14 Settings Bit 0 Bit 1 Function 00 TACH4 01 THERM 10 SMBALERT 11 GPIO RECOMMENDED IMPLEMENTATION Configuring the ADT7468 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 Remote 1 temperature channel. • Ambient temperature measured through Remote 2 temperature channel. • Bidirectional THERM pin. This feature allows Intel Pentium 4 PROCHOT monitoring and can function as an overtemperature THERM output. It can alternatively be programmed as an SMBALERT system interrupt output. TACH2 PWM3 TACH3 D1+ D1– 3.3VSB 5V 12V/VID5 CURRENT VCORE GND ADT7468 SCL SDA D2+ D2– TACH1 VID[0:4]/VID[0:5] PWM1 AMBIENT TEMPERATURE SMBALERT THERM FRONT CHASSIS FAN REAR CHASSIS FAN 5(VRM9)/6(VRM10) ADP316x VRM CONTROLLER VCOMP PROCHOT CPU FAN CPU ICH Figure 15. ADT7468 Configuration |
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