AN-612 APPLICATION NOTE One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 • www.analog.com ADT7463 Configurations by Mary Burke 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCORE). 6. 2.5 V Measurement Input Used to Monitor CPU Current (connected to VCOMP output of ADP316x VRM controller). This is used to determine CPU power consumption. 7. 5 V Measurement Input. 8. VRM temperature uses local temperature sensor. 9. CPU Temperature Measured Using Remote 1 Temperature Channel. 10. Ambient Temperature Measured through Remote 2 Temperature Channel. 11. If not using VID5, this pin can be reconfigured as the +12 V monitoring input. 12. Bidirectional THERM Pin. Allows Intel® Pentium 4® PROCHOT monitoring and can function as an overtemperature THERM output. 13. SMBALERT System Interrupt Output. INTRODUCTION This document is intended as a supplement to the ADT7463 data sheet. Since many of the pins on the ADT7463 are multifunctional, there are many possible configurations of the ADT7463. The purpose of this document is to describe all the possible options and their configuration register settings. RECOMMENDED IMPLEMENTATION Configuring the ADT7463 as in Figure 2 provides the systems designer with the following features: 1. Six VID Inputs (VID0 to VID5) for VRM10 Support. 2. Two PWM Outputs for Fan Control of up to Three Fans (the front and rear chassis fans are connected in parallel). 3. Three TACH Fan Speed Measurement Inputs. TACH2 PWM1 FRONT CHASSIS FAN TACH1 ADT7463 PWM3 REAR CHASSIS FAN 5(VRM9)/6(VRM10) TACH3 VID[0:4]/VID[0:5] D2+ D2– THERM D1+ AMBIENT TEMPERATURE PROCHOT D1– 3.3VSB 5V 12V/VID5 ADP316x VRM CONTROLLER VCOMP SDA SCL CURRENT VCORE SMBALERT GND Figure 1. Recommended Implementation ©2008 SCILLC. All rights reserved. April 2008 - Rev. 1 REV. 0 Publication Order Number: AN612/D AN-612 CONFIGURATION OPTION 1 Configuring the ADT7463 as in Figure 2 provides the systems designer with the following features: 1. Six VID Inputs (VID0 to VID5) for VRM10 Support. Enabling VID5 also enables the VID code change detect feature. 2. Three PWM Outputs for Fan Control of up to Four Fans (PWM1 to PWM3). 3. Four TACH Fan Speed Measurement Inputs. 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCCP). 6. SMBALERT Interrupt Output. 7. Bidirectional THERM Pin. Allows P4 PROCHOT monitoring and can function as an overtemperature THERM output. 8. Two Remote Diode Temperature Measurements. PWM1/XTO SDA 1 24 SCL 2 23 VCCP GND 3 22 SMBALERT VCC 4 21 VID5 VID0 5 20 THERM VID1 6 VID2 7 VID3 ADT7463 19 VID4 TOP VIEW (Not to Scale) 18 D1+ D1– 8 17 TACH3 9 16 D2+ PWM2 10 15 D2– TACH1 11 14 TACH4/ADDRESS SELECT TACH2 12 13 PWM3/ADDRESS ENABLE Figure 2. Recommended Pinout Option CONFIGURING THE ADT7463 FOR CONFIGURATION 1 The following bits need to be configured for the recommended pinout: Register Bit Setting Function Selected VID Register (0x43) Configuration Register 4 (0x7D) Configuration Register 3 (0x78) Configuration Register 4 (0x7D) <7> VIDSEL = 1 <0> AL2.5V = 1 <1> Therm Timer = 1 <1> TH5V = 1 Configures Pin 21 as the VID5 input Configures Pin 22 as the SMBALERT output Enables the THERM monitoring function Configures Pin 20 as the bidirectional THERM pin Rev. 1 | Page 2 of 7 | www.onsemi.com –2– REV. 0 AN-612 CONFIGURATION OPTION 2 Configuring the ADT7463 as in Figure 3 provides the systems designer with the following features: 1. Five VID Inputs (VID0 to VID4) for VRM9.x Support. 2. Two PWM Outputs for Fan Control (PWM1 and PWM3). 3. Three TACH Fan Speed Measurement Inputs. 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCCP). 6. 2.5 V Measurement Input. 7. 12 V Measurement Input. 8. 5 V Measurement Input. 9. Two Remote Diode Temperature Measurements. 10. SMBALERT Interrupt Output. 11. Bidirectional THERM Pin. Allows Intel P4 PROCHOT monitoring and can function as an overtemperature THERM output. PWM1/XTO SDA 1 24 SCL 2 23 VCCP GND 3 22 2.5V VCC 4 21 12V VID0 5 20 5V ADT7463 VID2 19 VID4 TOP VIEW 7 (Not to Scale) 18 D1+ VID3 VID1 6 D1– 8 17 TACH3 9 16 D2+ SMBALERT 10 15 D2– TACH1 11 14 ADDRESS SELECT/THERM TACH2 12 13 PWM3/ADDRESS ENABLE Figure 3. Pinout Option 2 CONFIGURING THE ADT7463 FOR PINOUT OPTION 2 The following bits need to be configured for Pinout Option 2: Register Bit Setting Function Selected VID Register (0x43) Configuration Register 3 (0x78) Configuration Register 3 (0x78) Configuration Register 4 (0x7D) Configuration Register 4 (0x7D) <7> VIDSEL = 0 <0> ALERT = 1 <1> Therm Timer = 1 <0> AL2.5V = 0 <1> TH5V = 0 Configures Pin 21 as the 12 V input Configures Pin 10 as SMBALERT output Enables THERM monitoring on Pin 14 Configures Pin 22 as 2.5 V input Configures Pin 20 as 5 V input Rev. 1 | Page 3 of 7 | www.onsemi.com REV. 0 –3– AN-612 CONFIGURATION OPTION 3 Configuring the ADT7463 as in Figure 4 provides the systems designer with the following features: 1. Five VID Inputs (VID0 to VID4) for VRM9.x Support. 2. Three PWM Outputs for Fan Control of up to Four Fans (PWM1 to PWM3). 3. Four TACH Fan Speed Measurement Inputs. 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCCP). 6. 2.5 V Measurement Input. 7. 12 V Measurement Input. 8. 5 V Measurement Input. 9. Two Remote Diode Temperature Measurements. PWM1/XTO SDA 1 24 SCL 2 23 VCCP GND 3 22 2.5V VCC 4 21 12V VID0 5 20 5V 19 VID4 D1– VID1 6 VID2 7 VID3 ADT7463 TOP VIEW (Not to Scale) 18 D1+ 8 17 TACH3 9 16 D2+ PWM2 10 15 D2– TACH1 11 14 TACH4/ADDRESS SELECT TACH2 12 13 PWM3/ADDRESS ENABLE Figure 4. Pinout Option 3 CONFIGURING THE ADT7463 FOR PINOUT OPTION 3 The following bits need to be configured for Pinout Option 3: Register Bit Setting Function Selected VID Register (0x43) Configuration Register 4 (0x7D) Configuration Register 4 (0x7D) <7> VIDSEL = 0 <0> AL2.5V = 0 <1> TH5V = 0 Configures Pin 21 as the 12 V input Configures Pin 22 as 2.5 V input Configures Pin 20 as 5 V input Rev. 1 | Page 4 of 7 | www.onsemi.com –4– REV. 0 AN-612 CONFIGURATION OPTION 4 Configuring the ADT7463 as in Figure 5 provides the systems designer with the following features: SDA 1. Six VID Inputs (VID0 to VID5) for VRM10 Support. Enabling VID5 also enables the VID code change detect feature. 2. Three PWM Outputs for Fan Control of up to Four Fans (PWM1 to PWM3). 3. Four TACH Fan Speed Measurement Inputs. 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCCP). 6. 2.5 V Measurement Input. 7. 5 V Measurement Input. 8. Two Remote Diode Temperature Measurements. PWM1/XTO 1 24 SCL 2 23 VCCP GND 3 22 2.5V VCC 4 21 VID5 VID0 5 20 5V VID1 6 ADT7463 VID2 19 VID4 TOP VIEW 7 (Not to Scale) 18 D1+ VID3 D1– 8 17 TACH3 9 16 D2+ PWM2 10 15 D2– TACH1 11 14 TACH4/ADDRESS SELECT TACH2 12 13 PWM3/ADDRESS ENABLE Figure 5. Pinout Option 4 CONFIGURING THE ADT7463 FOR PINOUT OPTION 4 The following bits need to be configured for Pinout Option 4: Register Bit Setting Function Selected VID Register (0x43) Configuration Register 4 (0x7D) Configuration Register 4 (0x7D) <7> VIDSEL = 1 <0> AL2.5V = 0 <1> TH5V = 0 Configures Pin 21 as the VID5 input Configures Pin 22 as 2.5 V input Configures Pin 20 as 5 V input Rev. 1 | Page 5 of 7 | www.onsemi.com REV. 0 –5– AN-612 CONFIGURATION OPTION 5 Configuring the ADT7463 as in Figure 6 provides the systems designer with the following features: SDA 1. Five VID Inputs (VID0 to VID4) for VRM9.x Support. 2. Three PWM Outputs for Fan Control of up to Four Fans (PWM1 to PWM3). 3. Four TACH Fan Speed Measurement Inputs. 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCCP). 6. Two Remote Diode Temperature Measurements 7. 12 V Measurement Input. 8. SMBALERT Interrupt Output. 9. Bidirectional THERM Pin. Allows Intel P4 PROCHOT monitoring and can function as an overtemperature THERM output. PWM1/XTO 1 24 SCL 2 23 VCCP GND 3 22 SMBALERT VCC 4 21 12V VID0 5 20 THERM VID1 6 ADT7463 VID2 19 VID4 TOP VIEW 7 (Not to Scale) 18 D1+ VID3 D1– 8 17 TACH3 9 16 D2+ PWM2 10 15 D2– TACH1 11 14 TACH4/ADDRESS SELECT TACH2 12 13 PWM3/ADDRESS ENABLE Figure 6. Pinout Option 5 CONFIGURING THE ADT7463 FOR PINOUT OPTION 5 The following bits need to be configured for Pinout Option 5: Register Bit Setting Function Selected VID Register (0x43) Configuration Register 3 (0x78) Configuration Register 4 (0x7D) Configuration Register 3 (0x78) Configuration Register 4 (0x7D) <7> VIDSEL = 0 <0> ALERT = 0 <0> AL2.5V = 1 <1> Therm Timer = 1 <1> TH5V = 1 Configures Pin 21 as the 12 V input Configures Pin 10 as PWM2 output Configures Pin 22 as SMBALERT output Enables THERM monitoring Configures Pin 20 as THERM output Rev. 1 | Page 6 of 7 | www.onsemi.com –6– REV. 0 AN-612 CONFIGURATION OPTION 6 Configuring the ADT7463 as in Figure 7 provides the systems designer with the following features: SDA 1. Five VID Inputs (VID0 to VID4) for VRM9.x Support. 2. Three PWM Outputs for Fan Control of up to Four Fans (PWM1 to PWM3). 3. Four TACH Fan Speed Measurement Inputs. 4. VCC Measured Internally through Pin 4. 5. CPU Core Voltage Measurement (VCCP). 6. 2.5 V Measurement Input. 7. 12 V Measurement Input. 8. Bidirectional THERM Pin. Allows P4 PROCHOT monitoring and can function as an overtemperature THERM output. 9. Two Remote Diode Temperature Measurements. PWM1/XTO 1 24 SCL 2 23 VCCP GND 3 22 2.5V VCC 4 21 12V VID0 5 20 THERM VID1 6 ADT7463 VID2 19 VID4 TOP VIEW 7 (Not to Scale) 18 D1+ VID3 D1– 8 17 TACH3 9 16 D2+ PWM2 10 15 D2– TACH1 11 14 TACH4/ADDRESS SELECT TACH2 12 13 PWM3/ADDRESS ENABLE Figure 7. Pinout Option 6 CONFIGURING THE ADT7463 FOR PINOUT OPTION 6 The following bits need to be configured for Pinout Option 6: Register Bit Setting Function Selected VID Register (0x43) Configuration Register 4 (0x7D) Configuration Register 3 (0x78) Configuration Register 4 (0x7D) <7> VIDSEL = 0 <0> AL2.5V = 0 <1> Therm Timer = 1 <1> TH5V = 1 Configures Pin 21 as the 12 V input Configures Pin 22 as the 2.5 V input Enables THERM monitoring Configures Pin 20 as the bidirectional THERM pin ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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