Winbond Electronics W83782D Datasheet

W83782D
Winbond H/W
Monitoring IC

W83782D Data Sheet Revision History

Pages Dates Version Version

1

2

3

4

5

6

7

8

9

10

n.a. n.a. All the version before 0.50 are for internal use.

n.a. 98/7 0.5 n.a. First publication.

P.40 99/4 0.55 A1 Add the content of Diode Selection Register Index

P.42 99/4 0.55 A1 Add the content of VBAT Monitor Control Register

Main Contents

on Web

59h(Bank0)

Index 5Dh (Bank0)

Please note that all data and specifications are subject to change without notice. All
the trade marks of products and companies mentioned in this data sheet belong to
their respective owners.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or
systems where malfunction of these products can reasonably be expected to result
in personal injury. Winbond customers using or selling these products for use in
such applications do so at their own risk and agree to fully indemnify Winbond for
any damages resulting from such improper use or sales.

Preliminary W83782D

TABLE OF CONTENTS

1. GENERAL DESCRIPTION ............................................................................................1

2. FEATURES.......................................................................................................................2

2.1 MONITORING ITEMS .........................................................................................................................2

2.2 ACTIONS ENABLING .........................................................................................................................2

2.3 GENERAL ............................................................................................................................................ 2

2.4 PACKAGE............................................................................................................................................2

3. KEY SPECIFICATIONS.................................................................................................3

4. PIN CONFIGURATION..................................................................................................3

5. PIN DESCRIPTION.........................................................................................................4

6. FUNCTIONAL DESCRIPTION......................................................................................7

6.1 GENERAL DESCRIPTION ...................................................................................................................7

6.2 ACCESS INTERFACE ..........................................................................................................................7

6.2.1 ISA interface .................................................................................................................................7

6.2.2 I2C interface.................................................................................................................................. 9

6.2.3 The first serial bus access timing are shown as follow: ...................................................................9

6.2.4 The serial bus timing of the temperature 2 and 3 is shown as follow:...........................................11

6.3 ANALOG INPUTS.............................................................................................................................. 14

6.3.1 Monitor over 4.096V voltage:......................................................................................................15

6.3.2 Monitor negative voltage:............................................................................................................15

6.3.3 Monitor temperature from thermistor:..........................................................................................16

6.3.4 Monitor temperature from Pentium IITM thermal diode or bipolar transistor 2N3904 .................16

6.4 FAN SPEED COUNT AND FAN SPEED CONTROL.........................................................................17

6.4.1 Fan speed count........................................................................................................................... 17

6.4.2 Fan speed control......................................................................................................................... 19

Publication Release Date: April 1999

- I - Version A1

Preliminary W83782D

6.5 TEMPERATURE MEASUREMENT MACHINE................................................................................20

6.5.1 The W83782D temperature sensor 1 SMI# interrupt has two modes: ...........................................21

6.5.2 The W83782D temperature sensor 2 and sensor 3 SMI# interrupt has two modes and it is

programmed at CR[4Ch] bit 6.....................................................................................................22

6.5.3 The W83782D temperature sensor 2 and 3 Over-Temperature (OVT) has two modes, and they are
programmed at Bank1 and Bank2 CR[52h] bit1 . These two bits needs to be programmed the same

value. ...........................................................................................................................................23

7. REGISTERS AND RAM ............................................................................................... 24

7.1 ADDRESS REGISTER (PORT X5H) .................................................................................................. 24

7.2 DATA REGISTER (PORT X6H)......................................................................................................... 25

7.3 CONFIGURATION REGISTER ¾ INDEX 40H...................................................................................26

7.4 INTERRUPT STATUS REGISTER 1¾ INDEX 41H............................................................................ 26

7.5 INTERRUPT STATUS REGISTER 2 ¾ INDEX 42H........................................................................... 27

7.6 SMI# MASK REGISTER 1 ¾ INDEX 43H..........................................................................................28

7.7 SMI# MASK REGISTER 2 ¾ INDEX 44H..........................................................................................28

7.8 RESERVED REGISTER ¾ INDEX 45H..............................................................................................29

7.9 CHASSIS CLEAR REGISTER -- INDEX 46H .................................................................................... 29

7.10 VID/FAN DIVISOR REGISTER ¾ INDEX 47H................................................................................29

7.11 SERIAL BUS ADDRESS REGISTER ¾ INDEX 48H........................................................................30

7.12 VALUE RAM ¾ INDEX 20H- 3FH OR 60H - 7FH (AUTO-INCREMENT).......................................31

7.13 VOLTAGE ID (VID4) & DEVICE ID - 49H .....................................................................................33

7.14 TEMPERATURE 2 AND TEMPERATURE 3 SERIAL BUS ADDRESS REGISTER--INDEX 4AH .33

7.15 PIN CONTROL REGISTER - INDEX 4BH.......................................................................................34

7.16 IRQ#/OVT# PROPERTY SELECT - INDEX 4CH.............................................................................35

7.17 FAN IN/OUT AND BEEP/GPO# CONTROL REGISTER - INDEX 4DH..........................................36

7.18 REGISTER 50H ~ 5FH BANK SELECT - INDEX 4EH (NO AUTO INCREASE) ............................37

- II -

Preliminary W83782D

7.19 WINBOND VENDOR ID - INDEX 4FH (NO AUTO INCREASE)....................................................37

7.20 WINBOND TEST REGISTER -- INDEX 50H - 55H (BANK 0).......................................................38

7.21 BEEP CONTROL REGISTER 1-- INDEX 56H (BANK 0)................................................................38

7.22 BEEP CONTROL REGISTER 2-- INDEX 57H (BANK 0)................................................................39

7.23 CHIP ID -- INDEX 58H (BANK 0)....................................................................................................40

7.24 DIODE SELECTION REGISTER -- INDEX 59H (BANK 0)............................................................ 40

7.25 PWMOUT2 CONTROL -- INDEX 5AH (BANK 0)....................................................................... 40-A

7.26 PWMOUT1 CONTROL -- INDEX 5BH (BANK 0) ...........................................................................41

7.27 PWMOUT1/2 CLOCK SELECT -- INDEX 5CH (BANK 0)..............................................................41

7.28 VBAT MONITOR CONTROL REGISTER -- INDEX 5DH (BANK 0).............................................. 42

7.29 PWMOUT3 CONTROL -- INDEX 5EH (BANK 0) ........................................................................... 43

7.30 PWMOUT4 CONTROL -- INDEX 5FH (BANK 0)............................................................................ 43

7.31 TEMPERATURE SENSOR 2 TEMPERATURE (HIGH BYTE) REGISTER - INDEX 50H (BANK1)44

7.32 TEMPERATURE SENSOR 2 TEMPERATURE (LOW BYTE) REGISTER - INDEX 51H (BANK1)44

7.33 TEMPERATURE SENSOR 2 CONFIGURATION REGISTER - INDEX 52H (BANK1)...................45

7.34 TEMPERATURE SENSOR 2 HYSTERESIS (HIGH BYTE) REGISTER - INDEX 53H (BANK 1) .. 46

7.35 TEMPERATURE SENSOR 2 HYSTERESIS (LOW BYTE) REGISTER - INDEX 54H (BANK 1)...46

7.36 TEMPERATURE SENSOR 2 OVER-TEMPERATURE (HIGH BYTE) REGISTER - INDEX 55H

(BANK 1) ............................................................................................................................................47

7.37 TEMPERATURE SENSOR 2 OVER-TEMPERATURE (LOW BYTE) REGISTER - INDEX 56H

(BANK 1) ............................................................................................................................................47

7.38 TEMPERATURE SENSOR 3 TEMPERATURE (HIGH BYTE) REGISTER - INDEX 50H (BANK2)48

7.39 TEMPERATURE SENSOR 3 TEMPERATURE (LOW BYTE) REGISTER - INDEX 51H (BANK2)48

7.40 TEMPERATURE SENSOR 3 CONFIGURATION REGISTER - INDEX 52H (BANK 2)..................48

7.41 TEMPERATURE SENSOR 3 HYSTERESIS (HIGH BYTE) REGISTER - INDEX 53H (BANK 2) .. 49

7.42 TEMPERATURE SENSOR 3 HYSTERESIS (LOW BYTE) REGISTER - INDEX 54H (BANK 2)...49

7.43 TEMPERATURE SENSOR 3 OVER-TEMPERATURE (HIGH BYTE) REGISTER - INDEX 55H

(BANK 2) ............................................................................................................................................50

7.44 TEMPERATURE SENSOR 3 OVER-TEMPERATURE (LOW BYTE) REGISTER - INDEX 56H

(BANK 2) ............................................................................................................................................50

7.45 INTERRUPT STATUS REGISTER 3¾ INDEX 50H (BANK4).......................................................... 51

7.46 SMI# MASK REGISTER 3 ¾ INDEX 51H (BANK 4).......................................................................51

7.47 BEEP CONTROL REGISTER 3-- INDEX 53H (BANK 4)................................................................52

7.48 RESERVED REGISTER - INDEX 54H--58H (BANK 4)...................................................................52

Publication Release Date: April 1999

- III - Version A1

Preliminary W83782D

7.49 REAL TIME HARDWARE STATUS REGISTER I -- INDEX 59H (BANK 4) ..................................53

7.50 REAL TIME HARDWARE STATUS REGISTER II -- INDEX 5AH (BANK 4)................................54

7.51 REAL TIME HARDWARE STATUS REGISTER III -- INDEX 5BH (BANK 4)...............................54

7.52 PWMOUT3/4 CLOCK SELECT -- INDEX 5CH (BANK 4)..............................................................55

7.53 VALUE RAM 2¾ INDEX 50H - INDEX 5AH (AUTO-INCREMENT) (BANK 5)............................ 56

7.54 WINBOND TEST REGISTER - INDEX 50H (BANK 6)...................................................................56

8. SPECIFICATIONS ........................................................................................................ 57

8.1 ABSOLUTE MAXIMUM RATINGS................................................................................................... 57

8.2 DC CHARACTERISTICS ................................................................................................................... 57

8.3 AC Characteristics...............................................................................................................................59

8.3.1 ISA Read/Write Interface Timing................................................................................................59

8.3.2 Serial Bus Timing Diagram......................................................................................................... 60

9. HOW TO READ THE TOP MARKING......................................................................61

10. PACKAGE DIMENTIONS..........................................................................................62

11. APPLICATION CIRCUIT OF WINBOND W83782D / 781D ...................................63

- IV -

Priliminary W83782D

WINBOND H/W MONITORING IC

1. GENERAL DESCRIPTION

W83782D is an evolving version of W83782D --- Winbond's most popular hardware status
monitoring IC. The W83782D can be used to monitor several critical hardware parameters of the
system, including power supply voltages, fan speeds, and temperatures, which are very important for
a high-end computer system to work stable and properly. W83782D provides both ISA and I2C
serial bus interface.

An 8-bit analog-to-digital converter (ADC) was built inside W83782D. The W83782D can
simultaneously monitor 9 analog voltage inputs, 2 fan tachometer inputs, 3 remote temperature, one
case-open detection signal. The remote temperature sensing can be performed by thermistors, or
2N3904 NPN-type transistors, or directly from IntelTM Deschutes CPU thermal diode output. Also the
W83782D provides: 4 PWM (pulse width modulation) outputs for the fan speed control; beep tone
output for warning; SMI#, OVT#, GPO# signals for system protection events.

Through the application software or BIOS, the users can read all the monitored parameters of system
from time to time. And a pop-up warning can be also activated when the monitored item was out of
the proper/preset range. The application software could be Winbond's Hardware DoctorTM, or Intel
LDCM (LanDesk Client Management), or other management application software. Also the users can
set up the upper and lower limits (alarm thresholds) of these monitored parameters and to activate
one programmable and maskable interrupts. An optional beep tone could be used as warning signal
when the monitored parameters is out of the preset range.

TM

TM

Additionally, 5 VID inputs are provided to read the VID of CPU (i.e. PentiumTM II) if applicable. This is
to provide the Vcore voltage correction automatically. Also W83782D uniquely provides an optional
feature: early stage (before BIOS was loaded) beep warning. This is to detect if the fatal elements
present --- Vcore or +3.3V voltage fail, and the system can not be boomed up. Also there are 3
specific pins to provide selectable address setting for application of multiple devices (up to 8 devices)
wired through I2CTM interface.

Publication Release Date: April 1999

- 1 - Revision A1

Preliminary W83782D

2. FEATURES

2.1 Monitoring Items

• 3 thermal inputs from remote thermistors or 2N3904 NPN-type transistors or PentiumTM II
(Deschutes) thermal diode output

• 9 voltage inputs

--- typical for Vcore, +3.3V, +12V, -12V, +5V, -5V, +5V Vsb, Vbat, and one reserved

• 3 fan speed monitoring inputs

• Case open detection input

• WATCHDOG comparison of all monitored values

• Programmable hysteresis and setting points (alarm thresholds) for all monitored items

2.2 Actions Enabling

• Beep tone warning

•

4 PWM (pulse width modulation) outputs for fan speed control (3 are MUX optional)

--- Total up to 3 sets of fan speed monitoring and controlling

• Issue SMI#, OVT#, GPO# signals to activate system protection

• Warning signal pop-up in application software

2.3 General

• ISA and I2CTM serial bus interface

• 5 VID input pins for CUP Vcore identification (for PentiumTM II)

• Initial power fault beep (for +3.3V, Vcore)

• Master reset input to W83782D

• Independent power plane of digital Vcc and analog Vcc (inputs to IC)

• 3 pins (IA0, IA1, IA2) to provide selectable address setting for application of multiple devices (up

to 8 devices) wired through I2CTM interface

• IntelTM LDCM (DMI driver 2.0) support

• AcerTM ADM (DMI driver 2.0) support

• Winbond hardware monitoring application software (Hardware Doctor

Windows 95/98 and Windows NT 4.0/5.0

• Input clock rate optional for 24, 48, 14.318 Mhz

• 5V Vcc operation

TM

) support, for both

2.4 Package

• 48-pin LQFP

- 2 -

Preliminary W83782D

3

#

3. KEY SPECIFICATIONS

• Voltage monitoring accuracy ±1% (Max)

• Monitoring Temperature Range and Accuracy

- 40°C to +120°C ± 3°C(Max)

• Supply Voltage 5V

• Operating Supply Current 5 mA typ.

• ADC Resolution 8 Bits

4. PIN CONFIGURATION

B
E
E
P

-

/

5

5
V
S
B

V

G

G

V

I

N

P

I

D

D

O

N

3

A

#

25

24

VID2
PWMTOUT1

SDA

C

S

FAN1IO

FAN2IO
FAN3IO/PWMOUT2
VID4
CASEOPEN
MR

G N D D

13

CC

V

12

VREF
VTIN3/PIITD3
VTIN2/PIITD2
VTIN1/PIITD1

VID0

OVT#

ARDMSEL

SMI#

SA2/IA2
SA1/IA1
SA0/IA0

CS#

V

V

+

C

I

3.3

O

V

R

N

I

E

R

N

A

0

36

37

48

1

+

+

-

12

5

V

12

V

V

B

V

I

I

A

I

N

N

T

N

W83782D

L

I

I

C

O

O

L

W

R

K

#

I
N

D

D

D

D

D6D

4

5

7

V

D

D

2

I

1

0

D

/

/

1

P

P

W

W

M

M

O

O

U

U

T

T

4

3

Publication Release Date: April 1999

- 3 - Revision A1

Preliminary W83782D

Bi-directional ISA bus Data lines. This pin is activated if pin

ADRMSEL=0. /

Fan speed control PWM output. This pin is activated if pin

ADRMSEL=1.

Bi-directional ISA bus Data lines. This pin is activated if pin

ADRMSEL=0. /

Fan speed control PWM output. This pin is activated if pin

ADRMSEL=1.

5. PIN DESCRIPTION

I/O

- TTL level bi-directional pin with 12 mA source-sink capability

12t

I/O

- TTL level and schmitt trigger

12ts

OUT12 - Output pin with 12 mA source-sink capability
AOUT - Output pin(Analog)
OD12 - Open-drain output pin with 12 mA sink capability
INt - TTL level input pin
INts - TTL level input pin and schmitt trigger
AIN - Input pin(Analog)

PIN NAME PIN NO. TYPE DESCRIPTION

IOR# 1 IN
IOW# 2 IN
CLKIN 3 IN

D7~D2 4-9 I/O

D1 /

10 I/O

ts
ts

t

12t

12t

An active low standard ISA bus I/O Read Control.
An active low standard ISA bus I/O Write Control.
System clock input. Can select 48MHz or 24MHz or 14.318MHz.

The default is 24MHz.
Bi-directional ISA bus Data lines. D0 corresponds to the low

order bit, with D7 the high order bit. These pins are activated if
pin ADRMSEL=0.

PWMOUT4
D0 /

11 I/O

PWMOUT3
VID1 12 IN

OUT

OUT

12t

12

12

t

Voltage Supply readouts from P6. This value is read in the
VID/Fan Divisor Register.

VCC (+5V) 13 POWER

+5V VCC power. Bypass with the parallel combination of 10µF

(electrolytic or tantalum) and 0.1µF (ceramic) bypass capacitors.
GNDD 14 DGROUND Internally connected to all digital circuitry.
MR 15 IN
CASEOPEN# 16 IN

ts

t

Master reset input.

CASE OPEN detection . An active low input from an external

device when case is opened. This signal can be latched if pin

VBAT is connect to battery, even W83782D is power off.
VID4 17 IN

t

Voltage Supply readouts from P6. This value is read in the bit

<0> of Device ID Register.

- 4 -

Preliminary W83782D

Pin Discription, continued

PIN NAME PIN NO. TYPE DESCRIPTION

FAN3IO/
PWMOUT2
FAN2IO-

FAN1IO

SCL 21 IN
SDA 22 OD
PWMOUT1 23 OUT
VID2 24 IN

VID3 25 IN

BEEP/GPO# 26 OD

GNDA 27 AGROUND Internally connected to all analog circuitry. The ground reference

-5VIN 28 AIN 0V to 4.096V FSR Analog Inputs.
5VSB 29 AIN 0V to 4.096V FSR Analog Inputs.
VBAT 30 AIN 0V to 4.096V FSR Analog Inputs. (This pin should be connected

-12VIN 31 AIN 0V to 4.096V FSR Analog Inputs.
+12VIN 32 AIN 0V to 4.096V FSR Analog Inputs.
+5VIN 33 AIN This pin is Analog Vcc and connects internal monitor channel

+3.3VIN 34 AIN 0V to 4.096V FSR Analog Inputs.
VINR0 35 AIN 0V to 4.096V FSR Analog Inputs.
VCOREA 36 AIN 0V to 4.096V FSR Analog Inputs.
VREF 37 AOUT Reference Voltage.
VTIN3 /
PIITD3

18 I/O

12t

0V to +5V amplitude fan tachometer input. /

Fan speed control PWM output.

19-20 I/O

12t

0V to +5V amplitude fan tachometer input /

Fan on-off control output. These multi-functional pins can be

programmable input or output.

ts

12

12

t

Serial Bus Clock.

Serial Bus bi-directional Data.

Fan speed control PWM output.

Voltage Supply readouts from P6. This value is read in the

VID/Fan Divisor Register.

t

Voltage Supply readouts from P6. This value is read in the

VID/Fan Divisor Register.

12

Beep (Default) / General purpose output

This multi-functional pin is programmable.

for all analog inputs.

to 3V BATTERY.)

IN3 with fixed scale.

38 AIN Thermistor 3 terminal input.(Default) /

PentiumTM II diode 3 input.

This multi-functional pin is programmable.

Publication Release Date: April 1999

- 5 - Revision A1

Preliminary W83782D

Pin Discription, continued

PIN NAME PIN NO. TYPE DESCRIPTION

VTIN2 /
PIITD2

VTIN1 /
PIITD1

VID0 41 IN

OVT# 42 OD
ADRMSEL 43 IN

SMI# 44 OD

SA2-SA0

IA2,IA1,IA0
CS# 48 IN

39 AIN Thermistor 2 terminal input. (Default)/

PentiumTM II diode 2 input.

This multi-functional pin is programmable.

40 AIN Thermistor 1 terminal input. (Default)/

PentiumTM II diode 1 input.

This multi-functional pin is programmable.

t

Voltage Supply readouts from P6. This value is read in the

VID/Fan Divisor Register.

12

t

Over temperature Shutdown Output.

Pin 45--47 mode selection.

0 = The 3 lowest order bits of ISA Address Bus.(Default, internal

pull-down 47K ohm)

1 = 7 bit I2CTM address setting pin.(bit2 - bit0)

12

System Management Interrupt (open drain). This output is

enabled when Bit 1 in the Configuration Register is set to 1. The

default state is disabled.

45-47 IN

t

The three lowest order bits of the 16-bit ISA Address Bus. A0

corresponds to the lowest order bit.

(Default, when ARDMSEL =0 or left open )

IN

t

t

The hardware setting pin of 7 bit I2CTM serial address bit2, bit1

and bit0 at CR[48h]. (When ARDMSEL =1)

Chip Select input from an external decoder which decodes high

order address bits on the ISA Address Bus. This is an active low

input.

- 6 -

Preliminary W83782D

6. FUNCTIONAL DESCRIPTION

6.1 General Description

The W83782D provides 7 analog positive inputs, 3 fan speed monitors, at most 4 sets for fan PWM
(Pulse Width Modulation) control, 3 thermal inputs from remote thermistors or 2N3904 transistors or
Pentium
the monitor value exceed the set limit value including voltage, temperature, or fan counter. When
start the monitor function on the chip, the watch dog machine monitor every function and store the
value to registers. If the monitor value exceeds the limit value, the interrupt status will be set to 1.

6.2 Access Interface

The W83782D provides two interface for microprocessor to read/write internal registers.

6.2.1 ISA interface

The first interface uses ISA Bus to access which the ports of low byte (bit2~bit0) are defined in the
port 5h and 6h. The high byte (from ISA address bus bit15~bit3) of these ports is decoded by Chip
Select (CS#), the general decoded address is set to port 295h and port 296h. These two ports are
described as following:

Port 295h: W83782D Index register port.
Port 296h: Data port.
The register structure is showed as the Figure 1.

TM

II (Deschutes) thermal diode outputs, case open detection and beep function output when

Publication Release Date: April 1999

- 7 - Revision A1

ISA
Data

Bus

ISA

Address

Bus

Port 5h

Index
Register

Port 6h

Data
Register

Preliminary W83782D

Configuration Register

40h

SMI# Status/Mask Registers

41h, 42h, 44h, 45h

VID<3:0>/Fan Divisor Register

Temperature 2, 3 Serial
Bus Address

Select Bank for 50h~5Fh Reg.

Temperature 2 Control/Staus
Registers

47h

Serial Bus Address

48h

Monitor Value Registers

20h~3Fh

and

60h~7Fh (auto-increment)

VID<4>/Device ID

49h

4Ah

Control Register

4Bh~4Dh

4Eh

Winbond Vendor ID

4Fh

BANK 0

R-T Table Value
BEEP Control Register
Winbond Test Register

50h~58h

BANK 1

50h~56h

Figure 1. ISA interface access diagram

- 8 -

BANK 2

Temperature 3 Control/Staus
Registers

50h~56h

BANK 4

Additional Control/Staus
Registers

50h~5Ch

BANK 5

Additional Limit Value &

Value RAM

50h~57h

Preliminary W83782D

6.2.2 I2C interface

The second interface uses I2C Serial Bus. In the W83782D has three serial bus address. That is, the
first address defined at CR[48h] can read/write all registers excluding Bank 1 and Bank 2 temperature
sensor 2/3 registers. The second address defined at CR[4Ah] bit2-0 only read/write temperature
sensor 2 registers, and the third address defined at CR[4Ah] bit6-4 only can access (read/write)
temperature sensor 3 registers.

The first serial bus address of W83782D has 3 hardware setting bits set by pin47-45 when pin 43 is
set to high. The address is 00101[pin45][pin46][pin47]. If pin45=1, pin46=1, pin47=0, for example, the
content of CR[48h] is 00101110. If CR[4Ah] bit 2-0 is XXX , the temperature sensor 2 serial address is
1001XXXG, in which G is the read/write bit. If CR[4Ah] bit 6-4 is YYY , the temperature sensor 3
serial address is 1001YYYG, in which G is the read/write bit.

6.2.3 The first serial bus access timing are shown as follow:

(a) Serial bus write to internal address register followed by the data byte

SCL

SDA

0

0 1 0 1 1 0 1 D7 D6 D5 D4 D3 D2 D1 D0

Start By
Master

Figure 2. Serial Bus Write to Internal Address Register followed by the Data Byte

Frame 1

Serial Bus Address Byte

SCL

(Continued)

SDA (Continued)

7 8 0 7 8

R/W

Ack

by

781D

0

D7 D6 D5 D4 D3 D2 D1 D0

Frame 2

Internal Index Register Byte

Frame 3

Data Byte

7 8

Ack

by

781D

Stop

by

Master

Ack

by

781D

Publication Release Date: April 1999

- 9 - Revision A1

(b) Serial bus write to internal address register only

Preliminary W83782D

0

7 8 0 7 8

SCL

SDA

0 1 0 1 1 0 1 D7 D6 D5 D4 D3 D2 D1 D0

Start By
Master

Frame 1

Serial Bus Address Byte

R/W

Ack
781D

Ack

Stop by

by

by

Frame 2

Internal Index Register Byte

781D

Master

0

Figure 3. Serial Bus Write to Internal Address Register Only

(c) Serial bus read from a register with the internal address register prefer to desired location

SCL

SDA

0

0 1 0 1 1 0 1 D7 D6 D5 D4 D3 D2 D1 D0

Start By
Master

Frame 1

Serial Bus Address Byte

Figure 4. Serial Bus Write to Internal Address Register Only

7 8 0 7 8

R/W

Ack
781D

by

Frame 2

Internal Index Register Byte

0

Ack

by

Master

Stop by
Master

- 10 -

Preliminary W83782D

6.2.4 The serial bus timing of the temperature 2 and 3 is shown as follow:

(a) Typical 2-byte read from preset pointer location (Temp, TOS, T

SCL

SDA

0

0 1 0 1 1 0 1 D7 D1 D0

Start By

Master

Frame 1

Serial Bus Address Byte

7 8 0 7 8

R/W

Ack

by

782D

... ...

...

Frame 2

MSB Data Byte

Master

)

HYST

0 7

...

D7 D1 D0

Ack

by

Frame 3

LSB Data Byte

Figure 5. Typical 2-Byte Read From Preset Pointer Location

(b) Typical pointer set followed by immediate read for 2-byte register (Temp, TOS, T

Frame 2

Pointer Byte

Ack
by

Master

4

D1 D0

0 7

D7 D1 D0

...

Frame 5

LSB Data Byte

Ack

by

782D

SCL

SDA

SCL

SDA

Start By

Master

0

1 0 0 1 A2 A1 A0 R/W

Start By

Master

0

1 0 0 1 A2 A1 A0 R/W

Serial Bus Address Byte

Frame 1

Serial Bus Address Byte

Frame 3

7 8 0

0 0 0 0 0 0

Ack

by

782D

7 8 0 7 8

... ...

D7 D1 D0

...

Ack

by

782D

0

Frame 4

MSB Data Byte

Master

HYST

No Ack

by

Master

Stop by

Ack

Master

by

)

Stop by

Master

Figure 6. Typical Pointer Set Followed by Immediate Read for 2-Byte Register

(c) Typical read 1-byte from configuration register with preset pointer

SCL

SDA

0

1 0 0 1 A2 A1 A0 R/W D1D5 D4 D3D6

Start By
Master

Frame 1

Serial Bus Address Byte

Figure 7. Typical 1-Byte Read From Configuration With Preset Pointer

7 8 0

Ack

by

782D

D7 D2

Frame 2

Data Byte

Publication Release Date: April 1999

- 11 - Revision A1

8

7

D0

No Ack

Stop by

by

Master

Master

Preliminary W83782D

(d) Typical pointer set followed by immediate read from configuration register

SCL

0

SDA

1 0 0 1 A2 A1 A0 R/W

Start By

Master

Frame 1

Serial Bus Address Byte

0

7 8 0

SCL (Cont..)

SDA (Cont..)

1 0 0 1 A2 A1 A0 R/W

Repea
Start

By

Master

Frame 3

Serial Bus Address Byte

Figure 8. Typical Pointor Set Followed by Immediate Read from Temp 2/3
Configuration Register

(e) Temperature 2/3 configuration register Write

SCL

SDA

0

1 0 0 1 A2 A1 A0 R/W

Start By
Master

Frame 1

Serial Bus Address Byte

7 8 0

7 8 0

0 0 0 0 00

Ack

by

782D

D7 D5 D4

Ack

by

782D

D6 D3

Frame 4

MSB Data Byte

Frame 2

Pointer Byte

4

0 0 0 0 0 0 0

Ack
782D

by

Frame 2

Pointer Byte

4

D2 D1 D0

D1 D0

D1 D0

7

7 8

7 8

8

No Ack

by

Master

Ack

by

782D

782D

Ack

by

Stop by
Master

...

...

SCL (Cont...)

0

SDA (Cont...)

0 0 D4 D3 D2 D10 D0

Frame 3

Configuration Data Byte

Figure 9. Configuration Register Write

- 12 -

7 8

Ack

by

782D

Stop

by

Master

Preliminary W83782D

(f) Temperature 2/3 TOS and T

SCL

SDA

SCL (Cont...)

SDA (Cont...)

0

1 0 0 1 A2 A1 A0 R/W

Start By
Master

Frame 1

Serial Bus Address Byte

0

D6 D5 D4 D3 D2 D1D7 D0

Frame 3

MSB Data Byte

Figure 10. Configuration Register Write

HYST

write

7 8 0

Ack
by
782D

7 8

Ack

by

781D

4

0

0

0 0 0 0

Frame 2

Pointer Byte

7 8

D1 D0

0 7 8

D6 D5 D4 D3 D2 D1D7 D0

Frame 4

LSB Data Byte

Ack
by
782D

Ack
782D

Stop

by

by

Master

Publication Release Date: April 1999

- 13 - Revision A1

Preliminary W83782D

6.3 Analog Inputs

The maximum input voltage of the analog pin is 4.096V because the 8-bit ADC has a 16mv LSB.
Really, the application of the PC monitoring would most often be connected to power suppliers. The
CPU V-core voltage ,+3.3V and battery voltage can directly connected to these analog inputs. The
5VSB and +12V inputs should be reduced a factor with external resistors so as to obtain the input
range. As Figure 11 shows.

V1

Positive Input

Negative Input

Typical Thermister Connection

V3

V4

+2.5VINA

Positive Inputs

R1

R2

R7

R

THM

10K, 25 C

+2.5VINB

+3.3VIN

VDD(+5V)

12VIN

V2

R5

10K, 1%

R

VBAT

R3

R4

N12VIN

N5VIN

R8

VREF Pin 37
VTIN3

VTIN2
VTIN1

**The Connections of VTIN1 and VTIN2

are same as VTIN3

Pin 38
Pin 39
Pin 40

Pin 36
Pin 35
Pin 34
Pin 33
Pin 30

Pin 32

5VSB Pin 29

Pin 31

Pin 28

R6

8-bit ADC

with

16mV LSB

Figure 11.

- 14 -

Preliminary W83782D

Ω

Ω

−

×−β

6.3.1 Monitor over 4.096V voltage:

The input voltage +12VIN can be expressed as following equation.

R

12

VIN V

= ×

1

The value of R1 and R2 can be selected to 28K Ohms and 10K Ohms, respectively, when the input
voltage V1 is 12V. The node voltage of +12VIN can be subject to less than 4.096V for the maximun
input range of the 8-bit ADC. Similarly, the node voltage of 5VSB (measure standby power VSB for
ATX power supply) also can be evaluated by using two series resistors R3 and R4 which real value
can be 5.1K ohms and 7.5K ohms so as to obtain the 5VSB is limited to less than 4.096V. The Pin 33
is connected to the power supply VCC with +5V. There are two functions in this pin with 5V. The first
function is to supply internal analog power in the W83782D and the second function is that this
voltage with 5V is connected to internal serial resistors to monitor the +5V voltage. The value of two
serial resistors are 34K ohms and 50K ohms so that input voltage to ADC is 2.98V which is less than

4.096V of ADC maximum input voltage. The express equation can represent as follows.

V VCC

= ×

in

where VCC is set to 5V.

50

K K

50 34

Ω Ω

R R

K

+

2

+

1 2

≅

2 98

.

V

6.3.2 Monitor negative voltage:

The negative voltage should be connected two series resistors and a positive voltage VREF (is equal
to 3.6V). In the Figure 11, the voltage V3 and V4 are two negative voltage which they are -12V and ­5V respectively. The voltage V3 is connected to two serial resistors then is connected to another
terminal VREF which is positive voltage. So as that the voltage node N12VIN can be obtain a
posedge voltage if the scales of the two serial resirtors are carefully selected. It is recommanded from
Winbond that the scale of two serial resistors are R5=232K ohms and R6=56K ohm. the The input
voltage of node -12VIN can be calculated by following equation.

K

N VIN VREF V

If the V5 is equal to -12V then the voltage is equal to 0.567V and the converted hexdecimal data is set
to 35h by the 8-bit ADC with 16mV-LSB.This monitored value should be converted to the real
negative votage and the express equation is shown as follows.

= + ×

where VREF is equal 3.6V.

V

=

5

5 5

N VIN VREF

12

1

- 15 - Revision A1

232

K K

232 56

+

Ω Ω

β

V12

+( ) ( )

Publication Release Date: April 1999

Preliminary W83782D

−

×−γ

Where β is 232K/(232K+56K). If the N2VIN is 0.567 then the V5 is approximately equal to -12V.
The another negative voltage input V6 (approximate -5V) also can be evaluated by the similar

method and the serial resistors can be selected with R7=120K ohms and R8=56K ohms by the
Winbond recommended. The expression equation of V6 With -5V voltage is shown as follows.

N VIN VREF

V

Where the β is set to 120K/(120K+56K). If the monitored ADC value in the N5VIN channel is 0.8635,
VREF=3.6V and the parameter β is 0.6818 then the negative voltage of V6 can be evalated to be -

5V.

6.3.3 Monitor temperature from thermistor:

The W83782D can connect three thermistors to measure three different envirment temperature. The
specification of thermistor should be considered to (1) β value is 3435K, (2) resistor value is 10K
ohms at 25°C. In the Figure 11, the themistor is connected by a serial resistor with 10K Ohms, then
connect to VREF (Pin 37).

5

=

6

1

γ

6.3.4 Monitor temperature from Pentium IITM thermal diode or bipolar transistor 2N3904

The W83782D can alternate the thermistor to Pentium IITM (Deschutes) thermal diode interface or
transistor 2N3904 and the circuit connection is shown as Figure 12. The pin of Pentium IITM D- is
connected to power supply ground (GND) and the pin D+ is connected to pin PIITDx in the W83782D.
The resistor R=30K ohms should be connected to VREF to supply the diode bias current and the
bypass capacitor C=3300pF should be added to filter the high frequency noise. The transistor 2N3904
should be connected to a form with a diode, that is, the Base (B) and Collector (C) in the 2N3904
should be tied togeter to act as a thermal diode.

- 16 -