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TABLE OF CONTENTS

FEATURES ............................................................................................................................................ 1

GENERAL DESCRIPTION .................................................................................................................... 2

TABLE OF CONTENTS......................................................................................................................... 3

Key Specifications ............................................................................................................................... 5

PIN CONFIGURATION .......................................................................................................................... 5

PIN DESCRIPTION................................................................................................................................ 6

DESCRIPTION OF PIN FUNCTIONS ....................................................................................................6

Functional Description ........................................................................................................................ 9

General Description ........................................................................................................................... 9

Access Interface ................................................................................................................................ 9

Analog Inputs ................................................................................................................................... 16

FAN Speed Count and FAN Speed Control ..................................................................................... 19

Temperature Measurement Machine ............................................................................................... 21

REGISTERS AND RAM....................................................................................................................... 25

Address Register (Port x5h) ............................................................................................................. 25

Data Register (Port x6h) .................................................................................................................. 26

Configuration Register

! Index 40h ................................................................................................ 27

Interrupt Status Register 1

! Index 41h........................................................................................... 28

Interrupt Status Register 2

! Index 42h.......................................................................................... 28

nSMI Mask Register 1

! Index 43h................................................................................................. 29

nSMI Mask Register 2

! Index 44h................................................................................................. 29

Reserved Register

! Index 45h ...................................................................................................... 30

Chassis Clear Register -- Index 46h ................................................................................................ 30

VID/Fan Divisor Register

! Index 47h ............................................................................................ 30

Serial Bus Address Register

! Index 48h....................................................................................... 31

Value RAM

! Index 20h- 3Fh or 60h - 7Fh (auto-increment) ......................................................... 31

Voltage ID (VID4) & Device ID -- Index 49h ..................................................................................... 32

Temperature 2 and Temperature 3 Serial Bus Address Register--Index 4Ah.................................. 33

Pin Control Register -- Index4Bh ..................................................................................................... 33

nIRQ/nOVT Property Select -- Index 4Ch ........................................................................................ 34

FAN IN/OUT and BEEP/nGPO Control Register -- Index 4Dh ......................................................... 35

Register 50h ~ 5Fh Bank Select -- Index 4Eh.................................................................................. 36

SMSC Vendor ID -- Index 4Fh ......................................................................................................... 36

SMSC Test Register -- Index 50h - 55h (Bank 0)............................................................................ 37

BEEP Control Register 1-- Index 56h (Bank 0) ................................................................................ 37

BEEP Control Register 2-- Index 57h (Bank 0) ................................................................................ 38

Chip ID -- Index 58h (Bank 0) .......................................................................................................... 38

Reserved Register -- Index 59h (Bank 0)........................................................................................ 39

PWMOUT2 Control -- Index 5Ah (Bank 0) ....................................................................................... 39

PWMOUT1 Control -- Index 5Bh (Bank 0) ....................................................................................... 40

PWMOUT1/2 Clock Select -- Index 5Ch (Bank 0)............................................................................ 41

VBAT Monitor Control Register -- Index 5Dh (Bank 0)..................................................................... 41

PWMOUT3 Control -- Index 5Eh (Bank 0) ....................................................................................... 42

PWMOUT4 Control -- Index 5Fh (Bank 0) ....................................................................................... 42

Temperature Sensor 2 Temperature (High Byte) Register - Index 50h (Bank 1) ............................. 43