H/W Monitor. NCT7904D Datasheet

NCT7904D Monitor. Datasheet pdf. Equivalent

Part NCT7904D
Description H/W Monitor
Feature NCT7904D H/W Monitor Date: 2014/2/10 Revision: 1.44 NCT7904D Table of Content- 1. GENERAL DESCRIP.
Manufacture nuvoton
Datasheet
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NCT7904D H/W Monitor Date: 2014/2/10 Revision: 1.44 NCT7904 NCT7904D Datasheet
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NCT7904D
NCT7904D
H/W Monitor
Date: 2014/2/10 Revision: 1.44



NCT7904D
NCT7904D
Table of Content-
1. GENERAL DESCRIPTION ......................................................................................................... 7
2. FEATURES ................................................................................................................................. 8
2.1 Equipped Specific Interfaces .......................................................................................... 8
2.2 Monitoring Items ............................................................................................................. 8
2.3 PECI (Platform Environment Control Interface).............................................................. 8
2.4 SMART FANTM PWM Output Control ............................................................................. 9
2.5 Alarm Output................................................................................................................... 9
2.6 Self-initialization .............................................................................................................. 9
2.7 SMBus Master ................................................................................................................ 9
2.8 General ........................................................................................................................... 9
3. KEY SPECIFICATIONS ............................................................................................................ 10
4. PIN CONFIGURATION ............................................................................................................. 11
5. PIN DESCRIPTION................................................................................................................... 12
5.1 Pin Type Description..................................................................................................... 12
5.2 Pin Description List ....................................................................................................... 12
6. FUNCTIONAL DESCRIPTION.................................................................................................. 17
6.1 Access Interface ........................................................................................................... 17
6.1.1
Data write to the internal register .............................................................................17
6.1.2
Data read from the internal register .........................................................................17
6.2 Address Setting............................................................................................................. 18
6.3 Temperature Monitor Data Format ............................................................................... 18
The temperature data with 11-bit 2`s complement format...........................................................18
6.4 Voltage Sense Data Format ......................................................................................... 18
6.5 FAN_IN Count Calculation............................................................................................ 18
6.6 FAN_OUT Duty Cycle/DC output Calculation .............................................................. 19
6.7 Fan Speed Control........................................................................................................ 19
6.7.1
Step Up Time / Step Down Time .............................................................................19
6.7.2
Fan Output Nonstop Value ......................................................................................19
6.7.3
Smart Fan Control Table .........................................................................................19
6.7.4
DTS (Sensor) Based Fan Control ............................................................................21
6.8 PECI.............................................................................................................................. 21
6.8.1
Operation Mode .......................................................................................................21
6.8.2
CPU Temperature and Power Reporting .................................................................22
6.8.3
DRAM Thermal Data Reporting ...............................................................................23
6.8.4
PECI Listening .........................................................................................................23
6.9 SMI# Output.................................................................................................................. 24
6.9.1
Temperature ............................................................................................................24
6.9.2
Voltage ....................................................................................................................26
6.9.3
Fan ..........................................................................................................................26
6.10 EEPROM Self-Initialization ........................................................................................... 26
6.10.1
EEPROM Format.....................................................................................................26
6.10.2
Chip Initialization......................................................................................................27
6.11 PCH Thermal Data Report............................................................................................ 27
6.11.1
PCH Thermal Read .................................................................................................27
Nuvoton Confidential
- ii – 2014/2/10
Revision 1.44





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