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ADT7475ARQZ Datasheet(PDF) 9 Page - Analog Devices |
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ADT7475ARQZ Datasheet(HTML) 9 Page - Analog Devices |
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9 / 68 page  ADT7475 Rev. A | Page 9 of 68 PRODUCT DESCRIPTION The ADT7475 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 16), and an input line for the serial clock (Pin 1). All control and programming functions for the ADT7475 are performed over the serial bus. In addition, a pin can be reconfigured as an SMBALERT output to signal out-of-limit conditions. QUICK COMPARISON BETWEEN ADT7473 AND ADT7475 • The ADT7473 supports Advanced Dynamic TMIN features while the ADT7475 does not. • Acoustic smoothing is improved on the ADT7475. • THERM can be selected as an output only on the ADT7475. • The ADT7475 has two additional configuration registers. • The ADT7475 has other minor register changes. • The ADT7475 is similar to the ADT7473 in that it is powered by a supply no greater than 3.6 V. Exceeding this specification results in irreversible damage to the ADT7475. Signal pins (TACH/PWM) should be pulled up or clamped to 3.6 V maximum. See the Specifications section for more information. RECOMMENDED IMPLEMENTATION Configuring the ADT7475 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 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. The THERM pin can alternatively be programmed as an SMBALERT system interrupt output. TACH2 PWM3 TACH3 D1+ D1– GND ADT7475 SCL SDA TACH1 PWM1 CPU FAN AMBIENT TEMPERATURE SMBALERT D2+ D2– THERM PROCHOT FRONT CHASSIS FAN REAR CHASSIS FAN CPU ICH Figure 13. ADT7475 Configuration |
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