W83L786NG - NUVOTON - Datasheet.Directory

W83L786NR

W83L786NG

Nuvoton

H/W Monitoring IC

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- I - Revision 0.9

W83L786NR

Data Sheet Revision History

PAGES DATES VERSION VERSION

ON WEB MAIN CONTENTS

1 P.13 10/15/04 0.6 N/A

Pin 10: from Vram_SEN to VTIN1

Pin 11: from Vcore_SEN to D-

Pin 13: from Vref to Vcore_SEN

Pin 14: from D- to Vram_SEN

Pin 15: from D1+ to Vref

2 P.14, P.18,

P.51, P.55 11/15/04 0.7 N/A

Add pin function description, functional

description, electrical char acteristics

and top marking explanatio n

3 P.1, P.3,

P.5, P.9 07/04/05 0.8 N/A

Correct temp. sen sor measurement

method

4 N.A. 03/31/06 0.9 N/A

Add Pb-free package version; remove

application circuit

Please note that all data and specifications are subject to change without notice. All the trademarks of

products and compani es mentioned in this data sheet belong to their respe ctive 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. Nuvoton

customers using or selling these products for use in such applications do so at their own risk and

agree to fully indemnify Nuvoton for any damages resulting from su ch improper use or sales.

W83L786NR/ W83L786NG

- II -

Table of Contents-

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

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

2.1 Monitoring Items .............................................................................................................. 2

2.1.1 Temperature.....................................................................................................................2

2.1.2 Voltage.............................................................................................................................2

2.1.3 Fan...................................................................................................................................2

2.2 Actions Enabling.............................................................................................................. 2

2.3 General ............................................................................................................................ 2

2.4 Package........................................................................................................................... 2

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

4. BLOCK DIAGRAM...................................................................................................................... 3

5. PIN CONFIGURATION...............................................................................................................4

6. PIN DESCRIPTION..................................................................................................................... 5

7. FUNCTIONAL DESCRIPTION.................................................................................................... 8

7.1 General Description......................................................................................................... 8

7.2 Access Interface .............................................................................................................. 8

7.3 The First Serial Bus Access Timing................................................................................. 8

7.4 Analog Inputs...................................................................................................................9

7.4.1 Voltage Input can not be over 2.048V ............................................................................10

7.4.2 Voltage Fault (VOLTAGE_FAULT #)..............................................................................10

7.5 Temperature Measurement Machine............................................................................. 10

7.5.1 Monitor Temperature from Thermistor............................................................................11

7.5.2 Monitor Temperature from Thermal Diode .....................................................................11

7.5.3 Temperature Fault (TEMP_FAULT #) ............................................................................12

7.6 FAN Speed Count and FAN Speed Control .................................................................. 12

7.6.1 Fan Speed Count ...........................................................................................................12

7.6.2 Fan Speed Control .........................................................................................................14

7.6.3 SMART FANTM I Control...............................................................................................16

7.6.4 SMART FANTM II Control..............................................................................................17

7.6.5 Fan Fault (FAN_FAULT #) .............................................................................................19

7.7 Fault Signal—INT#......................................................................................................... 19

7.7.1 Temperature...................................................................................................................19

7.7.2 Voltage...........................................................................................................................21

7.7.3 Fan.................................................................................................................................21

8. CONTROL AND STATUS REGISTER..................................................................................... 22

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- III - Revision 0.9

8.1 Configuration Register - Index 40h................................................................................22

8.2 INT# Status Register 1 - Index 41h ............................................................................... 22

8.3 INT# Status Register 2 - Index 42h ............................................................................... 22

8.4 INT# Mask Register 1 - Index 43h................................................................................. 23

8.5 INT# Mask Register 2 - Index 44h................................................................................. 23

8.6 Register - Index 45h....................................................................................................... 23

8.7 Register - Index 46h....................................................................................................... 24

8.8 GPIO/GPO Function Enable Control Register - Index 47h............................................ 24

8.9 Register - Index 48h....................................................................................................... 24

8.10 GPIO1-2 & 5-7 I/O Mode Control Regist er - Index 49h.................................................24

8.11 GPO3-4 Output Data Register - Index 4Ah ................................................................... 25

8.12 GPIO1-2 & 5-7 Data Register - Index 4Bh.....................................................................26

8.13 Nuvoton Vendor ID (Low Byte) - Index 4Ch .................................................................. 26

8.14 Nuvoton Vendor ID (High Byte) - Index 4Dh..................................................................26

8.15 Chip ID - Index 4Eh........................................................................................................ 26

8.16 Register - Index 4Fh ...................................................................................................... 27

8.17 Register - Index 50h....................................................................................................... 27

8.18 GPIO1-2 & 5-7 Output Mode Control Register - Index 51h........................................... 27

8.19 INT# Property Select - Index 52h .................................................................................. 28

8.20 Thermal Sensor 1/2 Type Register - Index 53h.............................................................28

8.21 Fan Divisor Register - Index 54h................................................................................... 28

8.22 Reserved - Index 55h ~ 5Fh..........................................................................................29

8.23 FAN Configuration Register - Index 80h........................................................................ 30

8.24 DC FAN1 Output Voltage Level Control Register (Manual Mode) / FAN1 Output Voltage

Table (SMART FANTM II Mode) – Index 81h .................................................................30

8.25 FAN1 Output Voltage Table (SMART FANTM II Mode) - Index 82h............................. 31

8.26 TEMP0 (D+_D-) Target Temperature Register (Thermal Cruise Mode) / TEMP_POINT1

for FAN1 (SMART FANTM II Mode) - Index 83h............................................................. 31

8.27 TEMP_POINT2 for FAN1 (SMART FANTM II Mode) - Index 84h................................. 31

8.28 FAN 1 Speed Low Limit Rate Control Register (Thermal Cruise Mode) /

TEMP_POINT3 for FAN1 (SMART FANTM II Mode) - Index 85h................................... 32

8.29 TEMP_POINT4 for FAN1 (SMART FANTM II Mode) - Index 86h................................. 32

8.30 DC FAN2 Output Voltage Level Control Register (Manual Mode)/ FAN2 Output Voltage

Table (SMART FANTM II Mode) - 87h............................................................................ 32

8.31 FAN2 Output Voltage Table (SMART FANTM II Mode) - Index 88h............................. 33

8.32 TEMP1 (VTIN1) Target Temperature Register (Thermal Cruise Mode) /

TEMP_POINT1 for FAN2 (SMART FANTM II Mode) - Index 89h...................................33

W83L786NR/ W83L786NG

- IV -

8.33 TEMP_POINT2 for FAN2 (SMART FANTM II Mode) - Index 8Ah ................................ 33

8.34 FAN 2 Speed Low Limit Rate Control Register/ TEMP_POINT3 for FAN2 SMART

FANTM II Mode) - Index 8Bh........................................................................................... 34

8.35 TEMP_POINT4 for FAN2 (SMART FANTM II Mode) - Index 8Ch................................ 34

8.36 Tolerance of Temperature Register - Index 8Dh........................................................... 34

8.37 FAN 2D/3D state Control Register - Index 8Eh............................................................. 35

8.38 FAN Pre-Scale Regist er - Index 8Fh............................................................................. 35

8.39 FAN Initial Output Value – Index90h ............................................................................. 36

8.40 Fan Step down Time Register - Index 91h.................................................................... 36

8.41 Fan Step up Time Register - Index 92h......................................................................... 36

8.42 Temperature Sensor 0 (D+_D-) Offset Register - Index 93h......................................... 37

8.43 Temperature Sensor 1 (VTIN1) Offset Register – Index 94h........................................ 37

8.44 Register - Index 95h....................................................................................................... 37

8.45 Register - Index 96h....................................................................................................... 38

8.46 Register - Index 97h....................................................................................................... 38

8.47 Value RAM - Index 20h- 3Fh or 60h - 7Fh..................................................................... 38

9. ELECTRICAL CHARACTERISTICS......................................................................................... 40

9.1 Absolute Maximum Ratings........................................................................................... 40

9.2 DC Characteristics......................................................................................................... 40

9.3 AC Characteristics......................................................................................................... 42

9.3.1 Serial Bus Timing Diagram.............................................................................................42

9.3.2 VID Input Skew...............................................................................................................42

10. THE TOP MARKING.................................................................................................................43

11. PACKAGE SPECIFICATION.................................................................................................... 44

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 1 - Revision 0.9

1. GENERAL DESCRIPTION

W83L786NR/NG is an evolving product of W83L785R -- Nuvoton's most popular hardware monitoring

IC, and intelligent fan controlling IC. Specifically designed for the graphic cards and barebone /mini

systems, W83L786NR/NG can be used to monitor several critical hardware parameters of the system,

including voltages, fan speeds, and temperatures, which are very important for the system to work

stably and properly.

W83L786NR/NG can monitor up to 3 analog voltage inputs, 2 fan tachometer inputs, and 2 remote

temperature sensors. One of the temperature inputs is connected to CPU /GPU thermal diode sensor,

and the other remote temperature sensor could be performed by either thermal diode or thermistor.

Power-on fan_set configuration offers the function to choose one of the four duty cycles, 100%, 81%,

62%, 43%, as initial fan speed. 2 sets of PWM (Pulse Width Modulation) / DC (Direct Current) fan

output for SMART FANTM control – “Thermal CruiseTM” mode and “SMART FANTM II “mode. Under

“Thermal CruiseTM “mode, temperatures of GPU and the system can be maintained within specific

programmable ranges under the hardware control. Under “SMART FANTM II” mode, the fan could be

operated at the lowest possible speed for minimum acoustic noise, and the dynamic intelligent fan

management could create the most quiet system environment and stable working performance. An 8-

bit analog-to-digital converter (ADC) is built inside W83L786NR/NG. As for warning mechanism,

W83L786NR/NG provides four pure hardware event pins for independent warning signals:

VOLTAGE_FAULT#, FAN_FAULT#, TEMP_FAULT#, and INT#. All threshold values could be set for

system protection without any timing delay. One bit power-on address selection is used to decide the

address of the W83L786NR/NG over I2C serial bus interface. W83L786NR/NG also provides up to 7

optional multifunctional GPIO. W83L7 86NR/NG is powered by 3.3V.

Through the application software or BIOS, the users can read all the monitored parameters of system

from time to time. A pop-up warning can also be activated when the monitored item is out of the

proper / preset range. The application software could be Nuvoton's Hardware DoctorTM, IntelTM 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 activate one

programmable interrupts. For the spacing saving consideration of the Graphic cards and Notebook

system, W83L786NR/NG is 20-pin SSOP package.

W83L786NR/ W83L786NG

- 2 -

2. FEATURES

2.1 Monitoring Items

2.1.1 Temperature

 Measure the temperature with high accuracy.

 One thermal diode sensor (current mode) connected to CPU/GPU and one remote

sensor either by thermal diode (current mode) or the rmistor.

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

items.

2.1.2 Voltage

 3 voltage sensor inputs.

--- Typically for Vcore, RAM, etc.

2.1.3 Fan

 3D/2D application being used and transferring fan set to the most appropriate fan

speed control.

 Fan set: power on configuration for fan speed at four rotation rate levels at 43%, 62%,

81%, and 100% duty cycle.

 Two DC/PWM fan output cont rol.

 S

MART FANTM function compliant.

2.2 Actions Enabling

 Total up to 2 sets of fan speed monitorin g and controlling.

 Issue FAN_FAULT#, VOLTAGE_FAULT#, TEMP_FAULT#, and INT# signals to

activate system protection.

 Warning sig nal pop-up in application software.

2.3 General

 Interface: I²C / SMBus control.

 1 bit I2C address selectio n.

 Up to 7 GPIOs.

 Nuvoton hardware monitoring application software (Hardware DoctorTM) support

Windows 95 / 98 / 2000 / XP and Windows NT 4.0 / 5.0.

 3.3V VCC operation.

2.4 Package

 20-pin SSOP (209mil).

W83L786NR/ W83L786NG

3. KEY SPECIFICATIONS

 Voltage monitoring accuracy ±3% (typ.)

 Monitoring temperature range and accuracy 0°C to +160°C; ± 3°C (max.)

 Supply voltage 3.3V±10%

 Operating supply current 2 mA (typ.)

 Power down supply current 10 uA (typ.)

 ADC resolution 8 Bits

4. BLOCK DIAGRAM

CONTROL LOGIC &

GPU DIODE

SENSOR THERMAL

SENSOR

I2C

FAN

CONTROL

GPIO

GPU

POWER

PWM Remote

Thermistor

D +D -

ADDR SCL

SDA

FAN_SET

( INIO UT _ GP O )

FANIN1

FANIN2

FANOUT1

FANOUT2

Vcore

FAN 1

VREF

VTIN1

Fault D etector

INT#

FAN_FAULT#

VOLTAGE_FAULT#

VOLTAGE

SENSOR

Vcore_SEN

VRAM_SEN

FAN 2

GPIO

GND

VCC

DDR RAM OR

OTHER DEVICE

TEMP_FAULT#

Publication Release Date: March 31, 2006

- 3 - Revision 0.9

W83L786NR/ W83L786NG

5. PIN CONFIGURATION

W83L786NR

FAN_FAULT/GPIO1

TEMP_FAULT#/GPIO2

SCL

SDA

Vcc

ADDR/GPO3

FAN_SET/GPO4

FANIN1

FANIN2/GPIO5

VOLTAGE_FAULT#/GPIO7

INT#

PWM/DC_OUT2/GPIO6

PWM/DC_OUT1

GND

VTIN1

VREF

VRAM_SEN

VCORE_SEN

D+

D-

- 4 -

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 5 - Revision 0.9

6. PIN DESCRIPTION

PIN TYPE PIN ATTRIBUTE

I/O12t TTL level bi-directional pin with 12 mA source-si nk capability

I/O12ts TTL level and schmitt trigger with 12 mA source-sink cap ability

I/O

8ts

TTL level and schmitt trigger with 8 mA sour ce-sink capability

I/O6ts TTL level and schmitt trigger with 6 mA source-sink capability

I/OD12ts TTL level and schmitt trigger open drain output with 1 2 mA sink capability

OUT12 Output pin with 12 mA source-sink capability

OD12 Open-drain output pin with 12 mA sink capability

AOUT Output pin (Analog)

INt TTL level input pin

INts TTL level input pin and schmitt trigger

AIN Input pin(Analog)

PIN NAME NO PIN TYPE DESCRIPTION

FAN_FAULT# OD12 Active-Low output. This pin will be a logic LOW when the

fan1 or fan2 is abnormally stopped. (Default)

GPIO1

I/OD12TS General purpose I/O function.

This multi-functional pin is pro gra mmable.

TEMP_FAULT# OD12

Active-Low output. This pin will be a logic LOW when the

temperature of the system or CPU exceeds its limit.

(Default)

GPIO2

I/OD12TS General purpose I/O function.

This multi-functional pin is pro gra mmable.

SCL 3 INts Digital Input. SMBus serial clock input. Requires SMBus

pull-up.

SDA 4 I/OD12 Digital I/O (Open drain). SMBus bidirectional serial data.

Requires SMBus pull-up.

Vcc 5 POWER Power supply input.

W83L786NR/ W83L786NG

- 6 -

Continued

PIN NAME NO PIN TYPE DESCRIPTION

ADDR Determines the SMBus device add ress.

GPO3 6 INTS/OUT12 General purpose Output function.

This multi-functional pin is pro gra mmable.

FAN_SET AIN

Determines the FAN initial speed. Power on configuration

for fan speed at four rotation rate levels at 43%, 62%, 81%,

and 100%.

GPO4

OUT12 General purpose O utput function.

This multi-functional pin is pro gra mmable.

FANIN1 8 INTS 0V to +3.3V amplitude fan tachometer input. (Default)

FANIN2 INTS 0V to +3.3V amplitude fan t achometer input. (Default)

GPIO5 9 OUT12TS General purpose I/O function.

This multi-functional pin is pro gra mmable.

VTIN1 10 AIN

Analog Input. Connect to either diode sensor (current

mode) or thermistor.

node to VTIN1 if VTIN1 is connected to diode sensor

(

current mode

)

D- 11 AIN

Thermistor 2 terminal input (Default) /

Cathode to CPU Thermal Diode.

lso cathode to VTIN1 if VTIN1 is connected to diode

sensor (current mode).

Please connect this pin to the ground, see page 15,

figure 5.

D+ 12 AIN

Thermistor 1 terminal input (Default) /

Anode to CPU Thermal Di ode.

V CORE _SEN 13 AIN Analog Input. Monitors CPU core voltage (0V-3V).

V RAM _SEN 14 AIN Analog Input. Monitors RAM’s voltage.

VREF 15 AOUT Reference voltage.

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 7 - Revision 0.9

Continued

PIN NAME NO PIN TYPE DESCRIPTION

GND 16 GROUND Ground pin for the W83L786NR

PWM / DC OUT1 17 OD12 Fan speed control output. This pin is default DC output

level. It can be programmed as PWM out put.

PWM / DC OUT2 OD12 Fan speed control output. This pin is default DC output

level. It can be programmed as PWM out put.

GPIO6

I/OD12TS General purpose I/O function.

This multi-functional pin is pro gra mmable.

INT# 19 OD12 System Interrupt.

VOLTAGE_FAULT# OD12 Active-Low output. This pin will be a logic LOW when the

voltage exceeds its high/low limit. (Default)

GPIO7

I/OD12TS General purpose I/O function.

This multi-functional pin is pro gra mmable..

W83L786NR/ W83L786NG

7. FUNCTIONAL DESCRIPTION

7.1 General Description

The W83L786NR/NG provides 3 analog voltage inputs, 2 fan speed inputs and outputs which support

both PWM (Pulse Width Modulation) fan control and DC (Direct Current) fan control, all of them being

implemented with SMART FANTM I and SMART FANTM II, and 2 sets of thermal inputs for CPU/GPU

thermal diode sensor or remote temperature sensor. W83L786NR/NG is I2C / SMBus interface

compatible. Furthermore, the Watch Dog Timer will monitor every function and store the values to

registers for comparison with preset ranges. If the monitored value exceeds the limit value, the

interrupt status will be set to 1 and W83L786NR/NG will issue interrupt signals such as INT# and IRQ

if not masked. W83L786NR/NG also provides software and hardware Watch Dog Timer to avoid

system hang on.

7.2 Access Interface

The W83L786NR/NG provides I2C Serial Bus for microprocessor to read/write internal registers, and

the I2C address default value is 01011110b (Pin 6 pull high). If Pin 6 pulls low, the I2C address value is

01011100b.

7.3 The First Serial Bus Access Timi ng

(a) Serial bus writes to intern al address register followed by the data byte

Start By

Master

0101101 D7 D6 D5 D4 D3 D2 D1 D0

Ack

792D

R/W

Ack

792D

SCL

SDA

D7 D6 D5 D4 D3 D2 D1 D0

Ack

784R

Stop

Master

SCL

SDA (Continued)

780 78

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

Ack

792D

- 8 -

W83L786NR/ W83L786NG

(b) Serial bus read from a register

D7 D6 D5 D4 D3 D2 D1 D0

Nak

Master

Ack

792D

780 78

Frame 4

Data Byte

Frame 3

Serial Bus Address Byte

Figure 2. Serial Bus Read from Internal Address Register

Stop by

Master

Start By

Master

0101101 D7 D6 D5 D4 D3 D2 D1 D0R/W

Ack

792D

SCL

SDA

780 78

Frame 2

Internal Index Register Byte

Frame 1

Serial Bus Address Byte

Ack

792D

0101101R/W

Repeat

start

Master

7.4 Analog Inputs

The maximum input voltage of the analog pin is 2.048V because the 8-bit ADC has the 8mV LSB.

Actually, the application of the voltage monitoring would most often be connected to power suppliers.

The input voltage lower than 2.048V could directly connect to the analog inputs. The inputs voltage

higher than 2.048V should be reduced by external resistors so as to meet the input range. This is

shown in Figure 3.

VCORE(Max2.048V)

8-bit ADC

with

8mV LS B

Typ ical Therm ister

Connection

RTHM

Pin 15

VTIN1 Pin 10

P o sitive In p u ts

10K, 25 C**The connections of D+

is s a me a s V T I N 1

Pin 13

VREF

10K, 1%

Pin 14

100K , 1% R2

100K , 1%

VRAM(Max2.048V)

+2.5V

Figure 3

Publication Release Date: March 31, 2006

- 9 - Revision 0.9

W83L786NR/ W83L786NG

7.4.1 Voltage Input can not be over 2.048V

The input voltage Vcore, and Vram can be expressed as following equation:

5.2 RR R

VVRAM V+

×= + . V+2.5V is +2.5V inputs.

The value of R1 and R2 can be selected to 100K Ohms and 100K Ohms, respectively, when the input

voltage is 2.5V. The node voltage of VRAM can be subject to less than 2.048V for the maximum input

range of the 8-bit ADC. The pin 5 is connected to the power supply VCC with +3.3V. There are two

functions in this pin with 3.3V: the first function is to supply internal analog power of the

W83L786NR/NG and the second function is to connect this pin to internal serial resistors to monitor

the +3.3V voltage. The values of two serial resistors are 20K ohms and 40K ohms so that input

voltage to ADC is 1.1V which is less than 2.048V of ADC maximum input voltage. The express

equation can represent as follows.

KK K

VCCVin 1.1

4020 20 ≅

×=

where VCC is set to 3.3V.

7.4.2 Voltage Fault (VOLTAGE_FAULT #)

W83L786NR/NG provides a good protection for voltage. Set Pin 20 (VOLTAGE_FAULT#) to monitor

voltage. When Vcore (Pin13), Vram (Pin14), or VCC (Pin5) voltage exceeds high or low voltage limit in

VR2B ~ VR34, Pin 20 VOLTAGE_FAULT# will be asserted (Figure 4).

Figure 4. V oltage Fault

VOLTAGE_FAULT#

Vo lta g e Hi gh limit

V o lta g e L o w limit

7.5 Temperature Measurement Machine

- 10 -

W83L786NR/ W83L786NG

The temperature data format is 8-bit unsigned for thermal sensor. The 8-bit temperature data can be

obtained by reading the VR [25h] or VR [26h]. The format of the temperature data is shown in Table 1.

TEMPERATURE 8-BIT DIGITAL OUTPUT

8-BIT BINARY 8-BIT HEX

+160°C 1010,0000 A0h

+25°C 0001,1001 19h

+2°C 0000,0010 02h

+1°C 0000,0001 01h

+0°C 0000,0000 00h

Table 1

7.5.1 Monitor Temperature from Thermistor

The W83L786NR/NG can connect one thermistor and one thermal diode sensor to measure two

different environment temperatures. The specification of thermistor should be considered to (1) β

value is 3435 K, and (2) resistor value is 10K ohms at 25°C. In the Figure 3, the themistor is

connected by a serial re sistor with 10K Ohms, and then connect to VREF (pin 15).

7.5.2 Monitor Temperature from Thermal Diode

The W83L786NR/NG can alternate the thermistor to thermal diode interface and the circuit connection

is shown as Figure 5. The pin of D- is connected to power supply ground (GND) and the pin D+ is

connected to pin D+ or VTIN1 in the W83L786NR/NG. The bypass capacitor C=2200pF should be

added to filter the high frequency noise.

C=2200pF

B ipolar T ransistor

Tem perature sensor

2N3904 C=2200pF

D+

VTIN1

W83L786NR

CPU or GPU D+

D-

Therminal

Diode

D-

Figure 5

Publication Release Date: March 31, 2006

- 11 - Revision 0.9

W83L786NR/ W83L786NG

7.5.3 Temperature Fault (TEMP_FAULT #)

W83L786NR/NG provides a good protection for temperature fault. Set Pin 2 (TEMP_FAULT#) to

monitor temperature. When D+-D- (Pin12, 11), or VTIN1 (Pin10) temperature exceeds temperature

fault limit in VR35 or VR37, Pin 2 TEMP_FAULT# will be asserted (Figure 6).

Figure 6. TEM P_FAULT

TEM P_FAULT limit

TEMP_FAULT#

7.6 FAN Speed Count and FAN Speed Control

7.6.1 Fan Speed Count

Inputs are provided by the signals from fans equipped with tachometer outputs. The level of these

signals should be set to TTL level, and maximum input voltage cannot be over VCC. If the input signals

from the tachometer outputs are over the VCC, the external trimming circuit should be added to reduce

the voltage to obtain the input specification. The normal circuit and trimming circuits are shown in

Figure 7.

Determine the fan counter acco rding to:

Count RPM Divisor

=×

135 106

In other words, the fan speed counter has been read from register VR28 or VR29, and the fan speed

can be evaluated by the following equation.

RPM Count Divisor

=×

135 106

The default divisor is 2 and defined at CR54.bit0~2, bit4~6 which are three bits for divisor. That

provides very low speed fan counter such as power supply fan. Table 2 is an example for the relation

of divisor, RPM, and count.

DIVISOR NOMINAL RPM TIME PER COUNTS 70% RPM TIME FOR 70%

- 12 -

W83L786NR/ W83L786NG

REVOLUTION

1 8800 6.82 ms

153 6160 9.74 ms

2 (default) 4400 13.64 ms

153 3080 19.48 ms

4 2200 27.27 ms

153 1540 38.96 ms

8 1100 54.54 ms

153 770 77.92 ms

16 550 109.08 ms

153 385 155.84 ms

32 275 218.16 ms

153 192 311.68 ms

64 137 436.32 ms

153 96 623.36 ms

128 68 872.64 ms

153 48 1246.72 ms

Table 2

FAN Out

+12V

GND

Pull-up resister

4.7K Oh m s

+12V

Fan Input Pin 8

Pin 9

W83L786NR

22K~30K

10K FAN

Connector

FAN O ut

+12V

GND

Pull-up resister < 1K

or totem-pole output

+12V

Fan Input Pin 8

Pin 9

W83L786NR

> 1K

Figure 7-2. Fan with Tach Pull-Up to +12V, or

Totem-Pole Putput and Zener Clamp

3.3V Zener

Figure 7-1. Fan with Tach Pull-Up to +12V, or Totern-Pole

Output and Register Attenuator

FAN O ut

+5V

GND

Pull-up resister

4.7K Ohms

+5V

Fan Input Pin 8

Pin 9

W83L786NR

1K~2.7K

10K FAN

Connector

FAN O ut

+5V

GND

Pull-up resister < 1K

or totem-pole output

+5V

Fan Input Pin 8

Pin 9

W83L786NR

> 1K

Figure 7-4. Fan with Tach Pull-Up to +5V, or

Totem-Pole Putput and Zener Clamp

3.3V Zener

Figure 7-3. Fan with Tach Pull-Up to +5V, or Totern-Pole

Output and Register Attenuator

Publication Release Date: March 31, 2006

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W83L786NR/ W83L786NG

7.6.2 Fan Speed Control

The W83L786NR/NG provides two sets for PWM/DC fan speed control. The duty cycle of PWM or the

output voltage of DC can be programmed by a 4-bit register. There are four mode to control fan speed

which are set by programming CR80 [3:2] and CR [5:4], and defau lt are FAN_SET mode.

7.6.2.1. Default Fan Speed Setting

There is a pin to set the default value for fan speed control by adjusting external serial resistors. After

power up, the default value will be stored in CR90 (FAN_SET mode). The figure and table are shown

below.

FAN_SET

VCC

SECTION FAN SPEED RATE RA RB

3 100﹪ 9.1K ×

2 81﹪ 4.7K 9.1K

1 62﹪ 9.1K 4.7K

0 43﹪ × 9.1K

Figure 8 OFFSET Setting

7.6.2.2. PWM Mode

%100

16 ValueRegister bit -4 Programmed

(%)cycleDuty ×=−

- 14 -

W83L786NR/ W83L786NG

+12V

FAN

NMOS

PNP Transistor

PWM Clock Input

+5V

NMOS

PNP Transi

PWM Clock Input

Figure 9

7.6.2.3. DC Mode

W83L786NR/NG has a 4-bit DAC, which produces 0 to 3.3 voltages DC output that provides

maximum 2 sets for fan speed control. The analog output can be programmed in the CR 81, and CR

87 (manual mode). The expres sion of output voltage can be represented as follows,

16 ValueRegister bit -4 Programmed

VCCVoltage OUTPUT ×=

The application circuit is shown as follows,

LM358

33K

FAN

IO-12V

47K

NPN

0.1U

IO+12V

C1 Tachometer ou

FANOUT

Figure 10

Be careful when choosing the OP-AMP and the transistor. The OP-AMP is used for amplify the 5V

range of the DC output up to 12V. The transistor should has a suitable

value to avoid its base

current pulling down the OP-AMP ’s output and gain the common current to operate the fan at fully

speed. (For more cost and effort efficient solution please refer to W83391TS/QS – the DC fan pre-

driver that could provide up to 24V gate voltage for external N-channel MOSFET driving)

Publication Release Date: March 31, 2006

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W83L786NR/ W83L786NG

7.6.3 SMART FANTM I Control

W83L786NR/NG supports two sets SMART FANTM I function and mapping to D+,D- (PWM/DC_OUT1),

VTIN1 (PWM/DC_OUT2) . If CR80 [3:2] or CR80 [5:4] set to 2’b10, Fan1 or Fan2 will enable SMART

FANTM I function.

At this mode, W83L786NR/NG provides the SMART FANTM system to automatically control fan speed to

keep the temperatures of CPU and the system within specific range. At first a wanted temperature and

interval must be set (ex. 55 °C ± 3 °C) by BIOS and the fan speed will be lowered as long as the

current temperature remains below the setting value. Once the temperature exceeds the high limit

(58°C), the fan will be turned on with a specific speed set by BIOS (ex: 80% duty cycle) and

automatically controlled its PWM duty cycle with the temperature varying. Three conditions ma y occur:

(1) If the temperature still exceeds the high limit (ex: 58°C), PWM duty cycle will increase slowly. If the

fan has been operating in its full speed but the temperature still exceeds the high limit (ex: 58°C),

a warning message will be issued to protect the system.

(2) If the temperature goes below the high limit (ex: 58°C), but still above the low limit (ex: 52°C), the

fan speed will be fixed at the current speed because the temperature is in the target range (ex: 52

°C ~ 58°C).

(3) If the temperature goes below the low limit (ex: 52°C), PWM duty cycle will decrease slowly to 0 or

a preset stop value until the temperature exceeds the low limit.

Figure 11-1, 11-2 gives an illustration of Thermal Cruise Mode.

55`C

58`C

52`C

PWM

Duty

Cycle

100

Fan Start = 20%

A B CD

Figure 11-1

- 16 -

W83L786NR/ W83L786NG

55`C

58`C

52`C

PWM

Duty

Cycle

100

Fan Start = 20% Fan Stop = 10% Fan Start = 20%

ABC

Figure 11-2

Of course, SMART FANTM control system can be disabled and the fan speed control algorithm can be

programmed by BIOS or application software.

7.6.4 SMART FANTM II Control

W83786NR/NG provides 4 temperature points each can automatically control PWM or DC fan mode.

Each temperature maps different fan out level, the relationship is shown as follows: ps different fan out level, the relationship is shown as follows:

Temperature

F a n Duty C y c le

Tem p. 1 Tem p.2 Tem p.3 Tem p.4

Non-Stop Duty Cycle

Fan Duty Cycle Level 1

Fan Duty Cycle Level 2

Fan Duty Cycle Level 3

Fan D uty Cycle 100%

Temp. Tolerance

Figure 12 SMART FANTM II

behaviors

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W83L786NR/ W83L786NG

- 18 -

The SMART FANTM II, a new innovation of Nuvoton, is specifically designed to operate fans at the

lowest possible speed so as to minimize acoustic noise. As the figure shown above, it is clear that

SMART FANTM II describes a relationship between Fan PWM Duty Cycle/DC Level and temperature.

Users can program CR [80h] to enable SMART FANTM II mode. SMART FANTM II registers allow users to

define suitable fan output levels to improve acoustic noise, power consumption and reliability issues

regarding to specific fan.

Each fan has 4 duty cycle registers and 4 temperatur e point registers to setup the relation between fan

output and temperature. Tolerance registers CR [8Dh] is used to postpone the response of fan output

and avoid fan output throttles at each temperature point because fan throttling might produce some

undesired noise.

The mechanism of SMART FANTM II is described as follows:

(1) At first, the fan speed operates at Non-Stop Duty Cycle, and keeps constant while temperature

rises. When rising temperature hits critical Temp.1, fan speed remains unchanged. If the

temperature keeps on rising and finally hits the upper edge of Temp. Tolerance of Temp.1, it

triggers the fan speed change mechanism and fan speed jumps from Non-Stop Duty Cycle to Fan

Duty Cycle Level 1.

(2) Fan speed remains constant at Fan Duty Cycle Level 1 even though the monitored temperature

hits Temp.2.

(3) Fan speed will directly jump from Fan Duty Cycle Level 1 to Fan Duty Cycle Level 2 while the

monitored temperature hits the upper edge of Temp. Tolerance of Temp.2.

(4) Same mechanism happens between Temp.3 and Temp.4.

(5) If the monitored temperature between Temp.3 and Temp.4, for example, begins to fall, the fan will

keep its speed at Fan Duty Cycle Level 3, which is a constant.

(6) If the monitored temperature keeps on falling, the fan speed still remains the same unless the

temperature hits the lower edge of Temp. Tolerance of Temp.3.

(7) Once the monitored temperature hits the lower edge of Temp. Tolerance of Temp.3, the fan speed

reduces directly from Fan Duty Cycle Level 3 to Fan Duty Cycle Level 2, and keeps the same

speed until the temperature hits the next lower edge of Temp. Tolerance.

W83L786NR/ W83L786NG

Non-Stop Duty Cycle CR[81h] b3:b0 CR[87h] b3:b0

Duty Level 1 CR[81h] b7:b4 CR[87h] b7:b4

Duty Level 2 CR[82h] b3:b0 CR[88h] b3:b0

Duty Level 3 CR[82h] b7:b4 CR[88h] b7:b4

Temp Point 1 CR[83h] b7:b0 CR[89h] b7:b0

Temp Point 2 CR[84h] b7:b0 CR[8Ah] b7:b0

Temp Point 3 CR[85h] b7:b0 CR[8Bh] b7:b0

Temp Point 4 CR[86h] b7:b0 CR[8Ch] b7:b0

Tolerance CR[8Dh] b3:b0 CR[8Dh] b7:b4

7.6.5 Fan Fault (FAN_FAULT #)

W83L786NR/NG provides a good protection for fan speed. Set Pin 1 (FAN_FAULT#) to monitor fan

speed. When FANIN1 (Pin8) or FANIN2 (Pin9) exceeds fan count high limit in VR3B or VR3C. Pin1

FAN_FAULT# will be asserted (Figure 13).

Figure 13. FA N _FA U LT

Fan count lim it

FAN_FAULT#

7.7 Fault Signal—INT#

7.7.1 Temperature

Pin INT# for temperature has 3 modes.

7.7.1.1. Comparator Interrupt Mode

Temperature exceeding TO causes an interrupt and this interrupt will be reset when reading all of the

Interrupt Status Registers. Once an interrupt event has occurred by exceeding TO, then reset, if the

temperature remains above the THYST, the interrupt will occur again when the next conversion has

completed. If an interrupt event has occurred by exceeding TO and not reset, the interrupts will not

occur again. The interrupts will continue to occur in this manner until the temperature goes below

THYST. (Figure 14-1)

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W83L786NR/ W83L786NG

7.7.1.2. Two-Times Interrupt Mode

Temperature exceeding TO causes an interrupt and then temperature going below THYST will also

cause an interrupt if the previous interrupt has been reset by reading all the interrupt Status Register.

Once an interrupt event has occurred by exceeding TO, then reset, if the temperature remains above

the THYST, the interrupt will not occur. (Figure 14-2)

7.7.1.3. One-Time Interrupt Mode

Temperature exceeding TO causes an interrupt and then temperature going below THYST will not cause

an interrupt. Once an interrupt event has occurred by exceeding TO, then going below THYST, an

interrupt will not occur again until the temperature exceeding TO. (Figure 14-3)

HYST

***

Figure 14-1. Com parator Interrupt Mode

*Interrup t Reset w h en Interrupt S tatus R egisters are read

HYST

Figure 14-2. Tw o-Times Interrupt M ode

SMI# SMI#

** * **

*Interrupt Reset w hen Interrupt Status R egisters are read

TOI

THYST

Figure 14-3. O ne-Tim e Interrupt M ode

SM I# * *

- 20 -

W83L786NR/ W83L786NG

7.7.2 Voltage

INT# interrupt for voltage is Two-Times Interrupt Mode. Voltage exceeding high limit or going below

low limit will causes an interrupt if the previous interrupt has been reset by reading all the interrupt

Status Register. (Figure 1 5-1)

7.7.3 Fan

INT# interrupt for fan is Two-Times Interrupt Mode. Fan count exceeding the limit, or exceeding and

then going below the limit (set at value ram index 3Bh and 3Ch), will causes an interrupt if the

previous interrupt has been reset by reading all the interrupt Status Register. (Figure 15-2)

***

Figure 15-1. Voltage SM I# Mode

*Interrupt Reset when Interrupt Status Registers are read

Figure 15-2. Fan SM I# Mode

SMI# *

V o lta ge H ig h lim it

V o lta ge L ow limit

SMI# *

F an Cou n t limit

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W83L786NR/ W83L786NG

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8. CONTROL AND STATUS REGISTER

8.1 Configuration Register - Index 40h

Power on default [7:0] = 0000, 0001b

BIT NAME READ/WRITE DESCRIPTION

7 Software Reset Read/Write

A one restores power on default value to all

registers except the Serial Bus Address register.

This bit is itself clear when it is set.

6-5 Reserved Read/Write Reserved

4 SOFT_PWDN Read/Write

Software Power Down. Set to 1 to power down this

chip, but I2C interface is still working.

3 Reserved Read/Write Reserved

2 Reserved Read/Write Reserved

1 INT# Main Mask Read/Write

A one disables the INT# outputs without affecting

the contents of Interrupt Status Registers. The

device will stop monitoring. It will resume upon

clearing of this bit.

0 START Read/Write

A one enables startup of monitoring operations; a

zero puts the part in standb y mode.

Note: The outputs of Interrupt pins will not be

cleared if the user writes a zero to this location after

an interrupt has occurred unlike "INT_Clear'' bit.

8.2 INT# Status Register 1 - Index 4 1h

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

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read Only Reserved

6 TEMP1_STS Read Only A one indicates a High or Low limit has been exceeded

from temperature sensor 1 (VTIN1). This bit is cleared

when this register is read.

5 TEMP0_STS Read Only A one indicates a High or Low limit has been exceeded

from temperature sensor 0 (D+_D-). This bit is cleared

when this register is read.

4-3 Reserved Read Only Reserved

2 VCC_STS Read Only A one indicates a High or Low limit has been exceeded.

(VCC, +3.3V) This bit is cleared when this register is read.

1 VRAM_STS Read Only A one indicates a High or Low limit has been exceeded.

(VRAM) This bit is cleared when this register is read.

0 VCORE_STS Read Only A one indicates a High or Low limit has been exceeded.

(VCORE) This bit is cleared when this register is read.

8.3 INT# Status Register 2 - Index 4 2h

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 23 - Revision 0.9

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

BIT NAME READ/WRITE DESCRIPTION

7-2 Reserved Read Only Reserved.

1 FAN2_STS Read Only

A one indicates the fan count limit has been

exceeded. This bit is cleared when this register is

read.

0 FAN1_STS Read Only

A one indicates the fan count limit has been

exceeded. This bit is cleared when this register is

read.

8.4 INT# Mask Register 1 - Index 43h

Power on default <7:0> = 1101, 1110 b

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read/Write Reserved

6 MSK_T1_INT Read/Write A one disables the corresponding interrupt status bit for

SMI# interrupt. (Temperature 1)

5 MSK_T0_INT Read/Write A one disables the corresponding interrupt status bit for

SMI# interrupt. (Temperature 0)

4-3 Reserved Read/Write Reserved

2 MSK_VCC_INT Read/Write A one disables the corresponding interrupt status bit for

SMI# interrupt. (VCC, +3.3V)

1 MSK_VRAM_INT Read/Write A one disables the corresponding interrupt status bit for

SMI# interrupt. (VRAM)

0 MSK_VCORE_I

NT Read/Write A one disables the corresponding interrupt status bit for

SMI# interrupt. (VCORE)

8.5 INT# Mask Register 2 - Index 44h

Power on default <7:0> = 1111, 1110 b

BIT NAME READ/WRITE DESCRIPTION

7-2 Reserved Read/Write Reserved.

1 MSK_FAN2_INT Read/Write

A one disables the corresponding interrupt status

bit for SMI# interrupt. (Fan 2 speed counter)

0 MSK_FAN1_INT Read/Write

A one disables the corresponding interrupt status

bit for SMI# interrupt. (Fan 1 speed counter)

8.6 Register - Index 45h

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

W83L786NR/ W83L786NG

- 24 -

BIT NAME READ/WRITE DESCRIPTION

7-0 Reserved Read/write Reserved.

8.7 Register - Index 46h

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

BIT NAME READ/WRITE DESCRIPTION

7-0 Reserved Read/write Reserved

8.8 GPIO/GPO Function Enable Control Register - Index 47h

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

BIT NAME READ/WRITE DESCRIPTION

7 EN_GPIO2 Read/Write

Pin 2 Function Select.

<0> - Function of Pin 2 is TEMP_FAULT#.

<1> - Function of Pin 2 is GPIO2.

6 EN_GPIO1 Read/Write

Pin 1 Function Select.

<0> - Function of Pin 1 is FAN_FAULT#.

<1> - Function of Pin 1 is GPIO1.

5 EN_GPIO7 Read/Write

Pin 20 Function Select.

<0> - Function of Pin 20 is VOLTAGE_FAULT#.

<1> - Function of Pin 20 is GPIO7.

4-3 Reserved Read/Write Reserved

2 EN_GPIO6 Read/Write Pin 18 Function Select.

<0> - Function of Pin 18 is PWM/DC_OUT2.

<1> - Function of Pin 18 is GPIO6.

1 EN_GPIO5 Read/Write Pin 9 Function Select.

<0> - Function of Pin 9 is FANIN2.

<1> - Function of Pin 9 is GPIO5.

0 EN_GPO3

&4 Read/Write

Enable GPO3 & GPO4 Function of Pin 6 & Pin7.

<0> - Functions of GPO 3 & GPO4 are disabled.

<1> - Functions of GPO 3 & GPO4 are enabling.

8.9 Register - Index 48h

Reserved

8.10 GPIO1-2 & 5-7 I/O Mode Control Register - Index 49h

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

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 25 - Revision 0.9

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read/write Reserved.

6 GPIO2_MODE Read/Write

GPIO2 I/O Mode Select. (Only for GPIO function of Pin 2

is enabled.)

<0> - GPIO2 is an input port.

<1> - GPIO2 is an output port.

5 GPIO1_MODE Read/Write

GPIO1 I/O Mode Select. (Only for GPIO function of Pin 1

is enabled.)

<0> - GPIO1 is an input port.

<1> - GPIO1 is an output port.

4 GPIO7_MODE Read/Write

GPIO7 I/O Mode Select. (Only for GPIO function of Pin

20 is enabled.)

<0> - GPIO7 is an input port.

<1> - GPIO7 is an output port.

3-2 Reserved Read/Write Reserved

1 GPIO6_MODE Read/Write

GPIO6 I/O Mode Select. (Only for GPIO function of Pin

18 is enabled.)

<0> - GPIO6 is an input port.

<1> - GPIO6 is an output port.

0 GPIO5_MODE Read/Write

GPIO5 I/O Mode Select. (Only for GPIO function of Pin 9

is enabled.)

<0> - GPIO5 is an input port.

<1> - GPIO5 is an output port.

8.11 GPO3-4 Output Data Register - Index 4Ah

Power on default [7:0] = 000P, PPPP b (P: power on trapping)

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read/write Reserved.

6 GPO4_VAL Read/Write GPO4 Value. Set the output value of GPO4 pin.

5 GPO3_VAL Read/Write GPO3 Value. Set the output value of GPO3 pin.

4-0 Reserved Read/Write Reserved

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8.12 GPIO1-2 & 5-7 Data Register - Index 4Bh

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

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read/write Reserved.

6 GPIO2_VAL Read/Write GPIO2 Value. Set the output value of GPIO2 pin. Reading

this bit will return the value of pin 2.

5 GPIO1_VAL Read/Write GPIO1 Value. Set the output value of GPIO1 pin. Reading

this bit will return the value of pin 1.

4 GPIO7_VAL Read/Write GPIO7 Value. Set the output value of GPIO7 pin. Reading

this bit will return the value of pin 20.

3-2 Reserved Read/Write Reserved

1 GPIO6_VAL Read/Write GPIO6 Value. Set the output value of GPIO6 pin. Reading

this bit will return the value of pin 18.

0 GPIO5_VAL Read/Write GPIO5 Value. Set the output value of GPIO5 pin. Reading

this bit will return the value of pin 9.

8.13 Nuvoton Vendor ID (Low Byte) - Index 4Ch

Power-on default [7:0] = 1010, 0011 b (0 xA3h)

BIT NAME READ/WRITE DESCRIPTION

7:0 VIDL[7:0] Read Only Vendor ID Low Byte. Default A3h.

8.14 Nuvoton Vendor ID (High Byte) - Index 4Dh

Power-on default [7:0] = 0101, 1100 b (0 x5Ch)

BIT NAME READ/WRITE DESCRIPTION

7:0 VIDH[7:0] Read Only Vendor ID High Byte. Default 5Ch

8.15 Chip ID - Index 4Eh

Power on default [7:0] = 1000, 0000 b

BIT NAME READ/WRITE DESCRIPTION

7-0 CHIPID[7:0] Read Only Nuvoton Chip ID number. Read this register will return

0x80h for W83L786NR/NG.

W83L786NR/ W83L786NG

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8.16 Register - Index 4Fh

Reserved

8.17 Register - Index 50h

Reserved

8.18 GPIO1-2 & 5-7 Output Mode Control Register - Index 51h

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

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read/write Reserved.

6 GPIO2_OB Read/write Enable GPIO2 as Output Buffer. Set to

<1> GPIO2 can drive logical high or logical lo w.

<0> GPIO2 is open-drain.

5 GPIO1_OB Read/write Enable GPIO1 as Output Buffer. Set to

<1> GPIO1 can drive logical high or logical lo w.

<0> GPIO1 is open-drain.

4 GPIO7_OB Read/write Enable GPIO7 as Output Buffer. Set to

<1> GPIO7 can drive logical high or logical lo w.

<0> GPIO7 is open-drain.

3-2 Reserved Read/write Reserved

1 GPIO6_OB Read/write Enable GPI6 as Output Buffer. Set to

<1> GPIO6 can drive logical high or logical lo w.

<0> GPIO6 is open-drain.

0 GPIO5_OB Read/write Enable GPIO5 as Output Buffer. Set to

<1> GPIO5 can drive logical high or logical lo w.

<0>GPIO5 is open-drain.

W83L786NR/ W83L786NG

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8.19 INT# Property Select - Index 52h

Power on - <7:0> --0000, 0100 b

BIT NAME READ/WRITE DESCRIPTION

7-4 Reserved Read/Write Reserved.

3-2 TEMP_INT_MD [1:0] Read/Write

Temperature INT Mode Select.

<00> - Comparator Interrupt Mode:

Temperature 1/2 exceeds TO (Over-

temperature) limit causes an interrupt. Reading the

Interrupt Status will reset this interrupt.

<01> - Two Time Interrupt Mode:(Default)

This bit use in temperature sensor 1/2

interrupt mode with hysteresis and TO type.

Temperature exceeding TO, causes an interrupt

and then temperature going below THYST will also

cause another interrupt if the previous interrupt

has been reset by reading the interrupt Status

exceeding TO, then reset, if the temperature

remains above the THYST.

<10> - One Ti me Interrupt Mode:

This bit use in temperature sensor 1/2

interrupt mode with hysteresis type. Temperature

exceeding TO (Over-temperature) causes an

interrupt and then temperature going below THYST

(Hysteresis temperature) will not cause an

interrupt. Once an interrupt event has occurred by

exceeding TO, then going below THYST, and

interrupt will not occur again until the temperature

exceeding TO.

1 EN_INT# Read/Write

Enable INT# Output. A one enables the INT#

Interrupt output.

0 Reserved Read/Write Reserved.

8.20 Thermal Sensor 1/2 Type Register - Index 53h

Power on default [7:0] = 0100, 0001 b

BIT NAME READ/WRITE DESCRIPTION

7-2 Reserved Read/Write Reserved.

1 T1_TYPE Read/Write Temperature sensor 1 type.

<0> - Thermistor (10K @ 25 degree C, B=3435).

<1> - thermal diode.

0 T0_TYPE Read/Write Temperature sensor 0 (GPU) type.

<0> - Thermistor (10K @ 25 degree C, B=3435)

<1> - thermal diode.

8.21 Fan Divisor Register - Index 54h

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 29 - Revision 0.9

Power on default [7:0] = 0001, 0001 b

BIT NAME READ/WRITE DESCRIPTION

7 Reserved Read/write Reserved.

6-4 FAN2_DIV_SEL[2:0] Read/Write

FAN2 Divisor Select.

<000> - divide by 1;

<001> - divide by 2;

<010> - divide by 4;

<011> - divide by 8.

<100> - divide by 16.

<101> - divide by 32.

<110> - divide by 64.

<111> - divide by 128.

3 Reserved Read/write Reserved.

2-0 FAN1_DIV_SEL[2:0] Read/Write

FAN1 Divisor Select.

<000> - divide by 1;

<001> - divide by 2;

<010> - divide by 4;

<011> - divide by 8.

<100> - divide by 16.

<101> - divide by 32.

<110> - divide by 64.

<111> - divide by 128.

8.22 Reserved - Index 55h ~ 5Fh

Reserved

W83L786NR/ W83L786NG

- 30 -

8.23 FAN Configuration Register - Index 80h

Power on default [7:0] = 0011, 1100 b

BIT NAME READ/WRITE DESCRIPTION

7 EN_PWM2 Read/Write FAN2 Control Mode

<1> - PWM FAN Control Mode

<0> - DC FAN Control Mo de

6 EN_PWM1 Read/Write FAN1 Control Mode

<1> - PWM FAN Control Mode

<0> - DC FAN Control Mo de

5-4 FAN2_MODE Read/Write

FAN2 Control Mode.

<00> - Manual Control Mo de. (Default)

<01> - Thermal Cruise mode.

<10> - SMART FANTM II Mode.

<11> - FAN_SET.

3-2 FAN1_MODE Read/Write

FAN 1 Control Mode.

<00> - Manual Control Mo de. (Default)

<01> - Thermal Cruise mode.

<10> - SMART FANTM II Mode.

<11> - FAN_SET.

1-0 Reserved Read/Write Reserved.

8.24 DC FAN1 Output Voltage Level Control Register (Manual Mode) / FAN1

Output Voltage Table (SMART FANTM II Mode) – Index 81h

Power on default [7:0] 1111, 1111 b

For Manual Mode

BIT NAME READ/WRITE DESCRIPTION

7-4 Reserved Read/Write Reserved.

3-0 FAN1_DC

[3:0] Read/Write

DC FAN1 Output Level. Only for Thermal Manual Mode

while CR80h bit3-2 is 00. This 3-bit register determines

the DC FAN driving voltage.

<0x0h> - DC output is 0V.

<0xFh> - DC output is 3.3V.

<0xXh> - DC output levels are from 0V to 3.3v and they

are separated into 16 levels equ ally.

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

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For SMART FANTM II Mode

BIT NAME READ/WRITE DESCRIPTION

7-4 FAN1_TAB2[3:0] Read/Write FAN1 Output Level 2 for SMART FANTM II Mode.

3-0 FAN1_TAB1[3:0] Read/Write FAN1 Output Level 1 for SMART FANTM II Mode.

8.25 FAN1 Output Voltage Table (SMART FANTM II Mode) - Index 82h

Power on default [7:0] 1111, 1111 b

BIT NAME READ/WRITE DESCRIPTION

7-4 FAN1_TAB4[3:0] Read/Write FAN1 Output Level 4 for SMART FANTM II Mode.

3-0 FAN1_TAB3[3:0] Read/Write FAN1 Output Level 3 for SMART FANTM II Mode.

8.26 TEMP0 (D+_D-) Target Temperature Register (Thermal Cruise Mode) /

TEMP_POINT1 for FAN1 (SMART FANTM II Mode) - Index 83h

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

TEMP1 target temperature register for T hermal Cruis e mode.

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_TAR_T0[7:0] Read/Write TEMP0 Target Temperature. Only for Thermal

Cruise Mode while CR84h bit3-2 is 01.

TEMP_POINT1 register for Smart FAN II Mode.

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P1F1[7:0] Read/Write

TEMP_POINT1 for FAN1 use Smart FAN II

Mode.

8.27 TEMP_POINT2 for FAN1 (SMART FANTM II Mode) - Index 84h

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

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P2F1[7:0] Read/Write TEMP_POINT2 for FAN1 use SMART FANTM II

Mode.

W83L786NR/ W83L786NG

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8.28 FAN 1 Speed Low Limit Rate Control Register (Thermal Cruise Mode) /

TEMP_POINT3 for FAN1 (SMART FANTM II Mode) - Index 85h

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

BIT NAME READ/WRITE DESCRIPTION

7-4 Reserved Read/Write Reserved.

3-0 FAN1_LL [3:0] Read/Write Low Limit Speed of FAN1. Only for Thermal Cruise

mode.

TEMP_POINT3 register for Smart FAN II Mode.

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P3F1[7:0] Read/Write

TEMP_POINT3 for FAN1 use SMART FANTM II

Mode.

8.29 TEMP_POINT4 for FAN1 (SMART FANTM II Mode) - Index 86h

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

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P4F1[7:0] Read/Write TEMP_POINT4 for FAN1 use SMART FANTM II

Mode.

8.30 DC FAN2 Output Voltage Level Control Register (Manual Mode)/ FAN2 Output

Voltage Table (SMART FANTM II Mode) - 87h

Power on default [7:0] 1111, 1111 b

For Manual Mode

BIT NAME READ/WRITE DESCRIPTION

7-4 Reserved Read/Write Reserved.

3-0 FAN2_DC [3:0] Read/Write

DC FAN2 Output Level. Only for Thermal Manual Mode

while CR80h bit5-4 is 00. This 3-bit register determines

the DC FAN driving voltage.

<0x0h> - DC output is 0V.

<0xFh> - DC output is 3.3V.

<0xXh> - DC output levels are from 0V to 3.3v and they

are separated into 16 levels equ ally.

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 33 - Revision 0.9

For SMART FANTM II Mode

BIT NAME READ/WRITE DESCRIPTION

7-4 FAN2_TAB2[3:0] Read/Write FAN2 Output Level 2 for SMART FANTM II Mode.

3-0 FAN2_TAB1[3:0] Read/Write FAN2 Output Level 1 for SMART FANTM II Mode.

8.31 FAN2 Output Voltage Table (SMART FANTM II Mode) - Index 88h

Power on default [7:0] 1111, 1111 b

BIT NAME READ/WRITE DESCRIPTION

7-4 FAN2_TAB4[3:0] Read/Write FAN2 Output Level 4 for SMART FANTM II Mode.

3-0 FAN2_TAB3[3:0] Read/Write FAN2 Output Level 3 for SMART FANTM II Mode.

8.32 TEMP1 (VTIN1) Target Temperature Register (Thermal Cruise Mode) /

TEMP_POINT1 for FAN2 (SMART FANTM II Mode) - Index 89h

Power on - [7:0] = 0000, 0000 b

TEMP2 target temperature register for T hermal Cruis e mode.

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_TAR_T1[7:0] Read/Write

TEMP1 Target Temperature. Only for Thermal

Cruise Mode while CR84h bit5-4 is 01.

TEMP_POINT1 register for SMART FANTM II Mode.

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P1F2[7:0] Read/Write

TEMP_POINT1 for FAN2 use SMART FANTM II

Mode.

8.33 TEMP_POINT2 for FAN2 (SMART FANTM II Mode) - Index 8Ah

Power on - [7:0] = 0000, 0000 b

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P2F2[7:0] Read/Write TEMP_POINT2 for FAN2 use SMART FANTM II

Mode.

W83L786NR/ W83L786NG

- 34 -

8.34 FAN 2 Speed Low Limit Rate Control Register/ TEMP_POINT3 for FAN2 SMART

FANTM II Mode) - Index 8Bh

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

BIT NAME READ/WRITE DESCRIPTION

7-5 Reserved Read/Write Reserved.

4-1 FAN2_LL [3:0] Read/Write Low Limit Speed of FAN2. Only for Thermal Cruise

mode.

TEMP_POINT3 register for SMART FANTM II Mode.

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P3F2[7:0] Read/Write

TEMP_POINT3 for FAN2 use SMART FANTM II

Mode.

8.35 TEMP_POINT4 for FAN2 (SMART FANTM II Mode) - Index 8Ch

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

BIT NAME READ/WRITE DESCRIPTION

7-0 TEMP_P4F2[7:0] Read/Write TEMP_POINT4 for FAN2 use SMART FANTM II

Mode.

8.36 Tolerance of Temperature Register - Index 8Dh

Power on default [7:0] = 0011, 0011 b

For Thermal Cruise mode

BIT NAME READ/WRITE DESCRIPTION

7-4 TOL_T1[3:0] Read/Write Tolerance of Fan 2 Target Temperatures

(Temp1). Only for Thermal Cruise mode.

3-0 TOL_T0[3:0] Read/Write Tolerance of Fan 1 Target Temperature

(Temp0). Only for Thermal Cruise mode.

For Smart FAN II Mode

BIT NAME READ/WRITE DESCRIPTION

7-4 TOL_T1[3:0] Read/Write Tolerance of Fan 2 Temperatures (Temp1). Only

for SMART FANTM II Mode.

3-0 TOL_T0[3:0] Read/Write Tolerance of Fan 1 Temperature (Temp0). Only for

SMART FANTM II Mode.

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 35 - Revision 0.9

8.37 FAN 2D/3D state Control Register - Index 8Eh

At SMART FANTM II Mode, FAN will be controlled by 2D/3D mode after writing 2Dh/3Dh to CR8A

8.38 FAN Pre-Scale Register - Index 8Fh

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

BIT NAME READ/WRITE DESCRIPTION

7 PWM2_CLK_SEL Read/Write

PWM Input Clock Select of Fan 2. This bit

select FAN input clock to pre-scale divider.

<0> - 1.44MHz

<1> - 180KH z

6-4 PWM2_CLK_DIV

[2:0] Read/Write

FAN 2 PWM Input Clock divider.

<000> - divider is 1

<001> - divider is 2

<010> - divider is 4

<011> - divider is 8

<100> - divider is 16

<101> - divider is 32

<110> - divider is 64

<111> - divider is 128

3 PWM1_CLK_SEL Read/Write

PWM Input Clock Select of Fan 1. This bit

select FAN input clock to pre-scale divider.

<0h> - 1.44MHz

<1h> - 180KHz

2-0 PWM1_CLK_DIV

[2:0] Read/Write

FAN 1 PWM Input Clock divider.

<000> - divider is 1

<001> - divider is 2

<010> - divider is 4

<011> - divider is 8

<100> - divider is 16

<101> - divider is 32

<110> - divider is 64

<111> - divider is 128

W83L786NR/ W83L786NG

8.39 FAN Initial Output Value – Index90h

Power on trapping

BIT NAME READ/WRITE DESCRIPTION

7 FAN_3DST Read A one indicates FAN is working at 3D mode (for SMART

FANTM II Mo de).

It can be programmed directly by I2C.

6-4 Reserved Read/Write Reserved.

3-0 FANINI

[3:0] Read/Write

FAN Initial Speed.

FAN_SET

VDD

Use two resistors to divide a four section to represent

different initial FAN Speed. The table is shown a s following.

Section FAN Speed rate Ra Rb

3 100﹪ 9.1K ×

2 81﹪ 4.7K 9.1K

1 62﹪ 9.1K 4.7K

0 43﹪ × 9.1K

8.40 Fan Step down Time Register - Index 91h

Power on default [7:0] = 0001, 0100 b

BIT NAME READ/WRITE DESCRIPTION

7-0 STEP_DOWN_T[7:0] Read/Write The time interval, which is 1-second unit, to

decrease DC output level in SMART FANTM II

Control mode.

8.41 Fan Step up Time Register - Index 92h

Power on default [7:0] = 0000, 1010 b

BIT NAME READ/WRITE DESCRIPTION

7-0 STEP_UP_T[7:0] Read/Write The time interval, which is 1-second unit, to increase

DC output level in SMART FANTM II Control mode.

- 36 -

W83L786NR/ W83L786NG

8.42 Temperature Sensor 0 (D+_D-) Offset Register - Index 93h

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

BIT NAME READ/WRITE DESCRIPTION

7-0 OFFSET0[7:0] Read/Write

Temperature 0 base temperature. The real temperature is

sum of both monitor value and offset value.

0111,1111 => +127/4 degree C

0111,1110 => +126/4 degree C

0000,0001 => +1/4 degree C

0000,0000 => +0 degree C

1111,1111 => -1/4 degree C

1111,1110 => -2/4 degree C

1000,0000 => -128/4 degree

8.43 Temperature Sensor 1 (VTIN1) Offset Register – Index 94h

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

BIT NAME READ/WRITE DESCRIPTION

7-0 OFFSET1[7:0] Read/Write

Temperature 1 base temperatures. The real temperature

is sum of both monitor value and offset value.

0111,1111 => +127/4 degree C

0111,1110 => +126/4 degree C

0000,0001 => +1/4 degree C

0000,0000 => +0 degree C

1111,1111 => -1/4 degree C

1111,1110 => -2/4 degree C

1000,0000 => -128/4 degree

8.44 Register - Index 95h

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

BIT NAME READ/WRITE DESCRIPTION

7-0 Reserved Read/Write

Publication Release Date: March 31, 2006

- 37 - Revision 0.9

W83L786NR/ W83L786NG

- 38 -

8.45 Register - Index 96h

Power-on default [7:0] = 0001, 1001 b

BIT NAME READ/WRITE DESCRIPTION

7-0 Reserved Read/Write

8.46 Register - Index 97h

Power-on default [7:0] = 0001, 1001 b

BIT NAME READ/WRITE DESCRIPTION

7-0 Reserved Read/Write

Value RAM and Limit Value

8.47 Value RAM - Index 20h- 3Fh or 60h - 7Fh

INDEX A7-A0 DESCRIPTION UNIT

20h VCORE reading

21h VRAM reading

22h VCC reading

23h Reserved

24h Reserved

25h Temperature 0 reading (D+_D-, 0 ~ 255) °C

26h Temperature 1 reading (VTIN1, 0 ~ 255) °C

27h Reserved

28h FANIN1 reading

Note: This location stores the number of counts of the internal clock per

revolution. Count

29h FANIN2 reading

Note: This location stores the number of counts of the internal clock per

revolution. Count

2Ah Reserved

2Bh VCORE High Limit. (0xff)

2Ch VCORE Low Limit. (0x00)

2Dh VRAM High Limit. (0xff)

2Eh VRAM Low Limit. (0x00)

2Fh VCC High Limit. (0xff)

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 39 - Revision 0.9

Value RAM - Index 20h- 3Fh or 60h - 7Fh, continued.

INDEX A7-A0 DESCRIPTION UNIT

30h VCC Low Limit. (0x00)

31h Reserved

32h Reserved

33h Reserved

34h Reserved

35h Over Temperature 0 Limit (High). (0x50) °C

36h Temperature 0 Hysteresis Limit (Low). (0x4b) °C

37h Over Temperature 1 Limit (High). (0x50) °C

38h Temperature 1 Hysteresis Limit (Low). (0x4b) °C

39h Reserved °C

3Ah Reserved °C

3Bh FAN1 Fan Count Limit. (0xff)

Note: It is the number of counts of the internal clock for the Low Limit of

the fan speed. Count

3Ch FAN2 Fan Count Limit. (0xff)

Note: It is the number of counts of the internal clock for the Low Limit of

the fan speed. Count

3Dh FAN1 Speed Control Output Level

3Eh FAN2 Speed Control Output Level

3Fh Reserved

W83L786NR/ W83L786NG

- 40 -

9. ELECTRICAL CHARACTERISTICS

9.1 Absolute Maximum Ratings

PARAMETER RATING UNIT

Power Supply Voltage -0.5 to 7.0 V

Input Voltage -0.5 to VCC+0.5 V

Operating Temperature 0 to +70 ° C

Storage Temperature -55 to +150 ° C

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, VDD = 5V ± 10%, VSS = 0V)

PARAMETER SYM. MIN. TYP. MAX. UNIT CONDITIONS

I/O12t - TTL level bi-directional pin with source-sink capability of 12 mA

Input Low Voltage VIL 0.8 V

Input High Voltage VIH 2.0 V

Output Low Voltage VOL 0.4 V IOL = 12 mA

Output High Voltage VOH 2.4 V IOH = - 12 mA

Input High Leakage ILIH +10 μA VIN = VDD

Input Low Leakage ILIL -10 μA VIN = 0V

I/O12ts - 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 V VDD = 5 V

Input High Threshol d

Voltage Vt+ 1.6 2.0 2.4 V VDD = 5 V

Hysteresis VTH 0.5 1.2 V VDD = 5 V

Output Low Voltage VOL 0.4 V IOL = 12 mA

Output High Voltage VOH 2.4 V IOH = - 12 mA

Input High Leakage ILIH +10 μA VIN = V DD

Input Low Leakage ILIL -10 μA VIN = 0V

W83L786NR/ W83L786NG

Publication Release Date: March 31, 2006

- 41 - Revision 0.9

DC Characteristics, continued

PARAMETER SYM. MIN. TYP. MAX. UNIT CONDITIONS

OUT12t - TTL level output pin with source-sink capability of 12 mA

Output Low

Voltage VOL 0.4 V IOL = 12 mA

Output High

Voltage VOH 2.4 V IOH = -12 mA

OD8 - Open-drain output pin with sink capability of 8 mA

Output Low

Voltage VOL 0.4 V IOL = 8 mA

OD12 - Open-drain output pin with sink capability of 12 mA

Output Low

Voltage VOL 0.4 V IOL = 12 mA

OD48 - Open-drain output pin with sink capability of 48 mA

Output Low

Voltage VOL 0.4 V IOL = 48 mA

INt - TTL level input pin

Input Low Voltage VIL 0.8 V

Input High Voltage VIH 2.0 V

Input High Leakage ILIH +10 μA VIN = VDD

Input Low Leakage ILIL -10 μA VIN = 0 V

INts - TTL level Schmitt-triggered input pin

Input Low

Threshold Voltage Vt- 0.5 0.8 1.1 V VDD = 5 V

Input High

Threshold Voltage Vt+ 1.6 2.0 2.4 V VDD = 5 V

Hysteresis VTH 0.5 1.2 V VDD = 5 V

Input High Leakage ILIH +10 μA VIN = VDD

Input Low Leakage ILIL -10 μA VIN = 0 V

W83L786NR/ W83L786NG

9.3 AC Characteristics

9.3.1 Serial Bus Timing Diagram

VALID DATA

SCL

SDA IN

SDA OUT

tHD;SDA

tSCL

tSU;DAT tSU;STO

Serial Bus Timing Diagram

tHD;DAT

Serial Bus Timing

PARAMETER SYMBOL MIN. MAX. UNIT

SCL clock period t-SCL 10 uS

Start condition hold time tHD;SDA 4.7 uS

Stop condition setup-up time tSU;STO 4.7 uS

DATA to SCL setup time tSU;DAT 120 nS

DATA to SCL hold time tHD;DAT 5 nS

SCL and SDA rise time tR 1.0 uS

SCL and SDA fall time tF 300 nS

9.3.2 VID Input Skew

VALID VID

VIDA[5:0]/VIDB[5:0]

tskew

VALID VID

thold

VID Input Timing

PARAMETER SYMBOL MIN. MAX. UNIT

VID Input Unstable Time t-Skew 0.8 uS

VID Valid Input Hold Time t-hold 4 uS

- 42 -

W83L786NR/ W83L786NG

10. THE TOP MARKING

The top marking of W83L7 86NR

W83L786NR

443OB

2826978Y-61

Left: Nuvoton logo

1st line: part number: W83L786NR

2nd line: Tracking code 2 826978Y-61

3rd line: Tracking cod e 443 O B

443: packages made in '04, week 43

O: assembly house ID; A means ASE, S means SPIL, O means OSE

B: IC revision

The top marking of W83L7 86NG

W83L786NG

443OB

2826978Y-61

Left: Nuvoton logo

1st line: part number: W83L786NG, G means Pb-free package

2nd line: Tracking code 2 826978Y-61

3rd line: Tracking cod e 443 O B

443: packages made in '04, week 43

O: assembly house ID; A means ASE, S means SPIL, O means OSE

B: IC revision

Publication Release Date: March 31, 2006

- 43 - Revision 0.9

W83L786NR/ W83L786NG

11. PACKAGE SPECIFICATION

 20L SSOP-209 mil

0.002

0.197

0.291

7.80

7.40

8.20

5.30

c6.90

5.00

5.60

7.50

7.20

2.00

1.85

0.3230.307

0.073

0.079

0.220

0.272 0.2950.283

0.209

MIN.

DIMENSION IN INCH

SYMBOL DIMENSION IN MM

MIN. NOM MAX. MAX.NOM

0.05

0.009 0.015

0.004 0.010

0.021 0.030

0.050 0.004

0.22 0.38

0.09 0.25

0.65 0.0256

0.55 0.75

1.25 0.10

0.95 0.037

1.75

1.65 0.065 0.069

YbA1

A2 A

SEATING PLANE

DTEAIL A

DETAIL A

SEATING PLANE

- 44 -

W83L786NR/ W83L786NG

Important Notice

Nuvoton products are not designed, intended, authorized or warranted for use as components

in systems or equipment intended for surgical implantation, atomic energy control

instruments, airplane or spaceship instruments, transportation instruments, traffic signal

instruments, combustion control instruments, or for other applications intended to support or

sustain life. Furthermore, Nuvoton products are not intended for applications wherein failure of

Nuvoton products could result or lead to a situation wherein personal injury, death or severe

property or environmental damage c ould occur.

Nuvoton customers using or selling these products for use in such applications do so at their

own risk and agree to fully indemnify Nuvoton for any damages resulting from such improper

use or sales.

Publication Release Date: March 31, 2006

- 45 - Revision 0.9