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ADT7476ARQH-REEL Datasheet(PDF) 9 Page - ON Semiconductor |
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ADT7476ARQH-REEL Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 67 page ADT7476 http://onsemi.com 9 Product Description The ADT7476 is a complete thermal monitor and multiple fan controller for any system requiring thermal monitoring and cooling. The device communicates with the system via a serial system management bus. The serial bus controller has a serial data line for reading and writing addresses and data (Pin 1), and an input line for the serial clock (Pin 2). All control and programming functions for the ADT7476 are performed over the serial bus. In addition, a pin can be reconfigured as an SMBALERT output to signal out−of−limitconditions. Feature Comparisons Between ADT7476 and ADT7468 • Dynamic TMIN, dynamic operating point, and associated registers are no longer available in the ADT7476. The following related registers are gone: • Calibration Control 1 (0x36) • Calibration Control 2 (0x37) • Operating Point (0x33, 0x34, and 0x35) • Previously (in the ADT7468), TRANGE defined the slope of the automatic fan control algorithm. TRANGE now defines a true temperature range (in the ADT7476). • Acoustic filtering is now assigned to temperature zones, not to fans. Available smoothing times have been increased for better acoustic performance. • Temperature measurements are now made with two switching currents instead of three. SRC is not available in the ADT7476. • High frequency PWM can now be enabled/disabled on each PWM output individually. • THERM can now be enabled/disabled on each temperature channel individually. • The ADT7476 does not support full shutdown mode. • The ADT7476 offers increased temperature accuracy on all temperature channels. • The ADT7476 defaults to twos complement temperature measurement mode. • Some pins have swapped/added functions. • The powerup routine for the ADT7476 is simplified. • The ADT7476 has a higher maximum input voltage TACH/PWM spec, supporting a wider range of fans. • VCORE_LOW_ENABLE has been reallocated to Bit 7 of Configuration Register 1 (0x40). Recommended Implementation Configuring the ADT7476 as shown in Figure 13 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 4. • CPU temperature measured using Remote 1 temperature channel. • Remote temperature zone measured through Remote 2 temperature channel. • Local temperature zone measured through the internal 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. Figure 13. ADT7476 Configuration TACH2 PWM3 TACH3 D1+ D1– VCC +5VIN +12VIN/VID5 GND ADT7476 SCL SDA D2+ D2– TACH1 VID[0:4]/VID[0:5] PWM1 AMBIENT TEMPERATURE SMBALERT THERM 5(VRM9)/6(VRM10) PROCHOT FRONT CHASSIS FAN REAR CHASSIS FAN |
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