W83L785TS-S

Preliminary

W83L785TS-S

Data Sheet Revision History

Pages Dates Versio

Version
on Web

Main Contents

n.a.

All the version before 0.50 are for internal
use.

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.

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

TABLE OF CONTENTS

1. GENERAL DESCRIPTION.......................................................................... 5
2. FEATURES................................................................................................... 5
3. KEY SPECIFICATIONS............................................................................... 5
4. PIN CONFIGURATION .............. ERROR! BOOKMARK NOT DEFINED.6
5. PIN DESCRIPTION...................................................................................... 6
6.. FUNCTIONAL DESCRIPTION................................................................... 7

6.1 General

Description......................................................... Error! Bookmark not defined.

6.2 Access

Interface................................................................................................................ 7

6.2.1 The first serial bus access timing are shown as follow:................................................... 7
6.3 Analog

Inputs ................................................................................................................... 8

6.3.1 Temperature Measurement Machine ............................................................................. 8
6.3.2 Monitor temperature from thermal diode ....................................................................... 8
6.4 OFFSET and Temperature Fault Limit (FAULT_LIMIT) Setting ................................... 9
6.5 TEMP_FAULT#

............................................................................................................ 10

7. CONTENT OF DATA REGISTERS .......................................................... 11

7.1 Configuration

Register

Index 40h ............................................................................. 11

7.2 Reserved

--Index

41h~4Bh ............................................................................................. 11

7.3 Winbond Vendor ID (Low Byte) - Index 4Ch (Auto Increase)....................................... 11
7.4 Winbond Vendor ID (High Byte) - Index 4Dh (No Auto Increase)................................ 11
7.5 Chip ID -- Index 4Eh...................................................................................................... 12
7.6 Reserved -- Index 4Fh~51h ............................................................................................ 12
7.7 Thermal Sensor 1/2 Type Register -- Index 52h............................................................. 12
7.8 Temperature 1 Fault Limit -- Index 53h......................................................................... 12
7.9 Reserved

--Index

54h~84h) ............................................................................................ 13

7.10 Temperature 1 OFFSET Register-- Index 85h............................................................... 13

8. VALUE RAM AND LIMIT VALUE ........................................................... 13

8.1 Value

RAM

Index 20h- 3Fh....................................................................................... 13

9. SPECIFICATIONS..................................................................................... 14

9.1 Absolute

Maximum

Ratings............................................................................................ 14

9.2 DC

Characteristics......................................................................................................... 14

9.3 AC

Characteristics ......................................................................................................... 16

10. HOW TO READ THE TOP MARKING................................................... 17
11. PACKAGE DRAWING AND DIMENSIONS.......................................... 18

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

1. GENERAL DESCRIPTION

The W83L785TS-S a low-cost, fully integrated temperature sensor issues an alert signal when the
monitoring temperature exceeds the threshold. The W83L785TS-S provides 1 remote temperature
sensing connected to CPU thermal diode. There is one dedicated OFFSET/ FAULT_LIMIT pin
to compensate inaccuracy of CPU temperature measurement by adjusting external two serial
resistors and set up temperature fault threshold. When W83L785TS-S begins monitoring, the
Watch Dog machine monitors every function and store the value to registers. If the monitored
value exceeds the limit value, the interrupt status will be set to 1.The W83L785TS-S
communicates over a two-wire serial interface compatible with SMBus standards.

2. FEATURES

�

Low Cost

�

1 thermal inputs for remote CPU thermal diode

�

WATCHDOG comparison of all monitored values

�

Auto Protection When Over Temperature

�

serial bus interface

�

2.7~5.5V Supply

�

8-pin SOP (150mil)

3. KEY SPECIFICATIONS

�

Monitoring Temperature Range and Accuracy

- 40

�

C to +120

�

C(Max)

�

Supply Voltage

2.7V ~ 5.5V

�

Operating Supply Current

2 mA typ.

�

ADC Resolution

8 Bits

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

4. PIN CONFIGURATION

1
2

SCL

SDA

GND

TEMP_FAULT#

OFFSET/FAULT_LIMIT

VREF

CPUT

VDD

785TS-S

5. PIN DESCRIPTION

I/O

- TTL level bi-directional pin with 12 mA source-sink capability,open drain output

12t

I/O

12ts

- TTL level and schmitt trigger

OUT

- Output pin with 12 mA source-sink capability

AOUT - Output pin(Analog)
OD

- Open-drain output pin with 12 mA sink capability

- TTL level input pin

- TTL level input pin and schmitt trigger

AIN

- Input pin(Analog)

PIN NAME

PIN NO.

TYPE

DESCRIPTION

VDD

POWER

+3.3 VDD (or 3.3VSB) power supply input.

CPUT

AIN

CPU thermal diode input.

VREF 3

AOUT

Reference

Voltage.

OFFSET/
FAULT_LIMIT

VIN

This pin can be used to change CPUT offset value and set
up the temperature_fault limit.by adjusting two external
serial resistors.

GND

Ground Ground.

TEMP_FAULT# 6

Active-Low output. This pin will be a logic LOW when
CPU temperature exceeds limit.

SDA 7

I/OD

Serial Bus bi-directional Data.

SCL 8

t s

Serial Bus Clock.

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

6. FUNCTIONAL DESCRIPTION

6.1 General Description

The W83L785TS-S a low-cost, fully integrated temperature sensor issues an alert signal when the
monitoring temperature exceeds the threshold. The W83L785TS-S provides 1 remote temperature
sensing connected to CPU thermal diode. There is 1 dedicated OFFSET/ FAULT_LIMIT pin to
compensate inaccuracy of CPU temperature by adjusting external two serial resistors and set up
temperature fault threshold. When W83L785TS-S starts 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 W83L785TS-S provides I

C Serial Bus to read/write internal registers. In the W83L785TS-S,

the I2C address defined value is 0101110.

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

(a)

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

Start By

Master

Ack

785TR

R/W

Ack

785TR

SCL

SDA

Ack

785TR

Stop

Master

SCL

SDA (Continued)

Frame 2

Internal Index Register Byte

(Continued)

Frame 3

Data Byte

Frame 1

Serial Bus Address Byte

Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

(b)

Serial bus read form internal address register followed by the data byte

Repeat start

by Master

ack

785TR

R/W

ack

785TR

Ack

784R

Stop by

Master

Frame 2

Internal Index Register Byte

Frame 4

Data Byte from 785TR

Frame 1

Serial Bus Address Byte

Figure 2. Serial Bus read from Internal Address Register followed by the Data Byte

R/W

Nack

Master

Frame 3

Serial Bus Byte

ack

785TR

SCL

SDA

SCL(Continued)

SDA(Continued)

6.3 Analog Inputs

6.3.1 Temperature measurement machine

The W83L785TS-S provides a best solution to prevent CPU from being damaged. The
temperature data format is 8-bit two-complement for thermal sensor. The 8-bit temperature data
can be obtained by reading the register. The format of the temperature data is show in Table 1.

Table 1: The format of the temperature data

Temperature

8-Bit Digital Output

8-Bit Binary

8-Bit Hex

+125

�

0111,1101 7Dh

+25

�

0001,1001 19h

�

0000,0010 02h

�

0000,0001 01h

�

0000,0000 00h

-1

�

1111,1111 FFh

-2

�

1111,1110 FEh

-25

�

1110,0111 E7h

-55

�

1100,1001 C9h

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

6.3.2

Monitor temperature from thermal diode :

The W83L785TS-S can monitor the temperature from the thermal diode and issue
temperature fault signal to activate system protection when temperature exceeds the threshold.
The terminators of thermal diode are connected to power supply ground (GND) and the
CPUT(pin2) in the W83L785TS-S. The resistor R=15K ohms should be connected to VREF
to supply the diode bias current

R=15K, 1%

C=3300pF

VREF

CPUT1

W83L785TS-S

D+

D-

Therminal

Diode

Microprocessor

Figure 3

6.4 OFFSET and Temperature Fault Limit (FAULT_LIMIT) Setting

There is one dedicated pin to change the offset value and temperature fault limited value by
adjusting external serial resistors. By adjusting external resistors, there are two sets of
temperature fault limit to be chosen and they are 85,90

C. As for the application circuit and

corresponding resistors value, please see the figure and table as below.

OFFSET

VREF

Figure 4: OFFSET Setting

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

Table 2: The CPU OFFSET value and Temperature Fault Limited Value

TFAULT_LIMIT

OFFSET

R1 R2

0000XXXX 85 0

10K

0001XXXX 85 22

91K

9.1K

0010XXXX 85 24

30K

5.6K

0011XXXX 85 26

20K

5.6K

0100XXXX 85 28

13K

5.1K

0101XXXX 85 30

91K

4.7K

0110XXXX 85 32

68K

4.7K

0111XXXX 85 34

18K

16K

1000XXXX 90 0

16K

18K

1001XXXX 90 22

5.1K

7.5K

1010XXXX 90 24

4.7K

9.1K

1011XXXX 90 26

4.7K

12K

1100XXXX 90 28

5.1K

18K

1101XXXX 90 30

16K

1110XXXX 90 32

9.1K

91K

1111XXXX 90 34

10K

6.5 TEMP_FAULT#

The W83L785TS-S provides a good protection for temperature sensing. The W83L785TS-S
will issue an alert signal when the monitoring temperature exceeds the threshold. Setting pin 6
(TEMP_FAULT#) to monitor temperature and enable TEMP_FAULT# function. When
monitoring CPUT1 (Pin 2) temperature exceeds temperature fault limit (ex: 90

C) in CR26, or

CR27, pin6 TEMP_FAULT# will be asserted. As figure 5 shows.

Figure 5. TEMP_FAULT#

TEMP_FAULT Limit

TEMP_FAULT#

90 DEG

60 DEG

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

7. CONTENT OF DATA REGISTERS

7.1 Configuration Register

Index 40h

Power on default [7:0] = 0010,1101 b

Bit Name Read/Write

Description

INITIALIZATION Read/Write

A one restores power on default value to all
registers except the Serial Bus Address register.
This bit clears itself since the power on default is
zero.

6 Reserved

Read/Write Reserved

5 Reserved

Read/Write Reserved

4 SOFT_PWDN

Read/Write Software Power Down. If setting to 1,this chip

will power down, but I2C interface is still
working.

3 Reserved

Read/Write Reserved

2 En

_Temp

_FAULT

Read/Write

Enable Temperature Fault Function. When
Temperature 1 is out of the Temperature1 Fault
Limit value (defined in Index 85), the Pin 6 will
go to low level.

INT_ CLEAR

Read/Write

The device will stop monitoring. It will resume
upon clearing of this bit.

START

Read/Write

A one enables startup of monitored activities, a
zero puts the part in standby mode.

7.2 Reserved --Index 41h~4Bh

7.3 Winbond Vendor ID (Low Byte) - Index 4Ch (Auto Increase)

Power-on default [7:0] = 1010,0011 b (A3h)

Bit Name Read/Write

Description

7:0

VIDL[7:0]

Read Only

Vendor ID Low Byte. Default A3h.

7.4 Winbond Vendor ID (High Byte) - Index 4Dh (No Auto Increase)

Power-on default [7:0] = 0101,1100 b (5Ch)

Bit Name Read/Write

Description

7:0

VIDH[7:0]

Read Only

Vendor ID High Byte. Default 5Ch

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

7.5 Chip ID -- Index 4Eh

Power on default [7:0] = 0111,0000 b

Bit Name Read/Write

Description

7-0 CHIPID[7:0]

Read

Only Winbond Chip ID number. Read this register will

return 70h for W83L785TS.

7.6 Reserved -- Index 4Fh~51h

7.7 Thermal Sensor 1/2 Type Register -- Index 52h

Power on default [7:0] = 0000-0011 b

Bit Name Read/Write

Description

7-2 Reserved

Read/Write Reserved.

1-0 T1_TYPE[1:0]

Read/Write Temperature sensor 2 (environment) type.

0x - Thermistor (10K @ 25 C,

=3435)

11 - Thermal diode.

7.8 Temperature 1 Fault Limit -- Index 53h

Power on trapping

Bit Name Read/Write

Description

7-0 TEMP1_LM

Read/Write Temperature sensor 1 Limit Value.

FAULT_LIMIT

VREF

Use two resistors to divide an four section to
represent different temperature fault limit value and
offset limit value. The table is shown as following.

ADCVAL[7]: are represented as Fault Limit Value

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

7.9 Reserved --Index 54h~84h

7.10 Temperature 1 OFFSET Register-- Index 85h

Power on trapping
ADCVAL<7> == FAULT_LIMIT1; ADCVAL<6:4> == OFFSET1

FAULT_LIMIT

Offset Temperature

ADC Value

0000_xxxx X

10K

85 22

0001_xxxx

91K

9.1K

85 24

0010_xxxx

30K

5.6K

85 26

0011_xxxx

20K

5.6K

85 28

0100_xxxx

13K

5.1K

85 30

0101_xxxx

91K

4.7K

85 32

0110_xxxx

68K

4.7K

85 34

0111_xxxx

18K

16K

90 0

1000_xxxx

16K

18K

90 22

1001_xxxx

5.1K

7.5K

90 24

1010_xxxx

4.7K

9.1K

90 26

1011_xxxx

4.7K

12K

90 28

1100_xxxx

5.1K

18K

90 30

1101_xxxx

16K

90 32

110_xxxx 9.1K

91K

90 34

111_xxxx 10K

8. VALUE RAM AND LIMIT VALUE

8.1 Value RAM

Index 20h- 3Fh

Index A7-A0

Description

20-26h

Reserved

27h

Temperature 1 reading

28-3Fh Reserved

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

9. SPECIFICATIONS

9.1 Absolute Maximum Ratings

PARAMETER RATING

UNIT

Power Supply Voltage

-0.5 to 7.0

Input Voltage

3.3 to 5.5

Operating Temperature

0 to +70

�

Storage Temperature

-55 to +150

�

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.

9.2 DC Characteristics

(Ta = 0

�

C to 70

�

C, V

= 3.3~5V, V

= 0V)

PARAMETER SYM

MIN

TYP. MAX. UNIT

CONDITIONS

I/O

12t

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

Input Low Voltage

VIL

0.8

Input High Voltage

VIH

2.0

Output Low Voltage

VOL

0.4

= 12 mA

Output High Voltage

VOH

2.4

= - 12 mA

Input High Leakage

ILIH

+10

�

VIN = VDD

Input Low Leakage

ILIL

-10

�

VIN = 0V

I/O

12ts

- TTL level bi-directional pin with source-sink capability of 12 mA and schmitt-trigger level input

Input Low Threshold Voltage

Vt-

0.5

0.8

1.1

VDD = 5 V

Input High Threshold Voltage

Vt+

1.6

2.0

2.4

VDD = 5 V

Hysteresis

VTH

0.5

1.2

VDD = 5 V

Output Low Voltage

VOL

0.4

= 12 mA

Output High Voltage

VOH

2.4

= - 12 mA

Input High Leakage

ILIH

+10

�

VIN = VDD

Input Low Leakage

ILIL

-10

�

VIN = 0V

Publication Release Date: April 2002
Revision 0.5

W83L785TS-S

Preliminary

9.2 DC Characteristics, continued

PARAMETER SY

MIN. TYP. MAX. UNI

CONDITIONS

OUT

12t

- TTL level output pin with source-sink capability of 12 mA

Output Low Voltage

VOL

0.4

= 12 mA

Output High Voltage

VOH

2.4

= -12 mA

- Open-drain output pin with sink capability of 8 mA

Output Low Voltage

VOL

0.4

= 8 mA

- Open-drain output pin with sink capability of 12 mA

Output Low Voltage

VOL

0.4

= 12 mA

- Open-drain output pin with sink capability of 48 mA

Output Low Voltage

VOL

0.4

= 48 mA

- TTL level input pin

Input Low Voltage

VIL

0.8

Input High Voltage

VIH

2.0

Input High Leakage

ILIH

+10

�

VIN = VDD

Input Low Leakage

ILIL

-10

�

VIN = 0 V

- TTL level Schmitt-triggered input pin

Input Low Threshold Voltage

Vt-

0.5

0.8

1.1

VCC = 5 V

Input High Threshold Voltage

Vt+

1.6

2.0

2.4

VCC = 5 V

Hysteresis

VTH

0.5

1.2

VCC = 5 V

Input High Leakage

ILIH

+10

�

VIN = VCC

Input Low Leakage

ILIL

-10

�

VIN = 0 V

Publication Release Date: April 2002
Revision 0.5

Preliminary

Publication Release Date: April 2002

Revision 0.5

Temp_fault

1101XXXX

30K

16K

68K

7.5K

TEMP_FAULT

1000XXXX

4.7K

5.1K

15K 1%

0101XXXX

1111XXXX

Ver 0.4 W83L785TR_S change to W83L785TS_S

4.7K

3300P

Temp

RT1

THERMISTOR

10K 1%

0010XXXX

16K

D+

0001XXXX

VREF

20K

16K

1011XXXX

18K

0111XXXX

9.1K

0011XXXX

1110XXXX

4.7K

10K

1100XXXX

4.7K

WINBOND ELECTRONICS CORP.

SDA

10K

1010XXXX

9.1K

OFFSET

VCC

Temp

W83L785TS.SCH

0.4

W83L785TS_S Application Circuit

Wednesday, February 27, 2002

Title

Size

Document Number

Rev

Date:

Sheet

13K

5.6K

TEMPERATURE SENSORING CIRCUIT

4.7K

12K

91K

VREF

5.1K

I2C ADDRESS 0x5CH

W83L785TS_S

VDD

CPUT

Vref

OFFSET/Fault_limit

GND

Temp_fault#

SDA

SCL

5.1K

{

1001XXXX

4.7K

0.1u

Temp

10K 1%

OFFSET/FAULT_LIMIT

0110XXXX

18K

0000XXXX

91K

18K

10u/16V

5.6K

SCL

VCC

Ver 0.3 pin6 Temp_fault# change to Temp_fault

0100XXXX

91K

VREF

From
CPU

D-

W83L785TS-S

Электронный компонент: W86L785TS

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