W83L785R
WINBOND H/W MONITORING IC FOR NOTEBOOK
1. GENERAL DESCRIPTION
W83L785R is a condensed product of W83L785R --- Winbond's most popular hardware monitoring IC
for notebook. Specifically designed for the graphic cards and notebook systems, W83L785R 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.
An 8-bit analog-to-digital converter (ADC) was built inside W83L785R. The W83L785R can monitor 4
analog voltage inputs, 2 fan tachometer inputs, 2 remote temperature sensors. The remote
temperature sensing can be performed by thermistors, or 2N3904 NPN-type transistors, or connected
from IntelTM Deschutes CPU thermal diode output. The W83L785R provides 2 PWM (pulse width
modulation) outputs for the fan speed control. Also the W83L785R provides: SMI#, OVT#, Temp
fault, GPIO signals for system protection events; I2CTM serial bus interface. W83L785R also provides
4 pure GPIO and 7 multifunctional GPIO pins, and powered by 3.3V.
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 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 to activate
one programmable and maskable interrupts. For the spacing saving consideration of the Notebook
system, W83L785R is in the package of 209mil 20pins-SSOP.
W83L785R
Preliminary
2. FEATURES
2.1 Monitoring Items
• 2 thermal inputs from remote thermistors or 2N3904 NPN-type transistors or PentiumTM II
(Deschutes) thermal diode output
• 4 voltage inputs
--- typical for Vcore, +3.3V (Power), +2.5V, +1.5V
• 2 sets of PWM fan speed control
• WATCHDOG comparison of all monitored values
• Programmable hysteresis and setting points (alarm thresholds) for all monitored items
2.2 Actions Enabling
• 2 PWM (pulse width modulation) outputs for fan speed control
--- Total up to 2 sets of fan speed monitoring and controlling
• Issue temperature fault signal as the temperature of the system/CPU exceeds its limit.
• Issue SMI#, OVT#, GPIO and Temp. Fault signals to activate system protection
• Warning signal pop-up in application software
2.3 General
• I2CTM serial bus interface
• IntelTM LDCM (DMI driver 2.0) support
• Winbond hardware monitoring application software (Hardware DoctorTM ) support, for both
Windows 95/98 and Windows NT 4.0/5.0
• Meet WfM 2.0 (Wired for Management) spec.
• 3.3V VCC operation
2.4 Package
• 20-pin SSOP (209mil)
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Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
3. KEY SPECIFICATIONS
• Voltage monitoring accuracy
±1% (Max)
• Monitoring Temperature Range and Accuracy
± 3°C(Max)
- 40°C to +120°C
• Supply Voltage
2.7V ~ 5.5V
• Operating Supply Current
2 mA typ.
• Power Down Supply Current
20 uA typ.
• ADC Resolution
8 Bits
4. PIN CONFIGURATION
FANIN1/GPIO1
1
20
VCC
FANIN2/GPIO2
2
19
CPUT1/PII1
PWMOUT1
3
18
CPUT2/PII2
PWMOUT2
4
17
VREF
GPIO5
5
16
VCORE/GPIO16
GPIO6
6
15
+1.5V/GPIO15
SMI#/GPIO7
7
14
+2.5VIN/GPIO14
OVT#/GPIO8
8
13
GPIO13
SCL
9
12
GND
SDA
10
11
TEMP_FAULT/GPIO11
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Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
5. PIN DESCRIPTION
I/O12t
- TTL level bi-directional pin with 12 mA source-sink capability,open drain output
I/O12ts
- TTL level and schmitt trigger
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
FANIN1 /
GPIO1
PIN NO.
1
TYPE
IN t s /
I/OD12ts
FANIN2 /
GPIO2
2
IN t s /
OUT1 2
PWMOUT1
PWMOUT2
GPIO5
GPIO6
3
4
5
6
SMI#/
GPIO7
7
OD12
OD12
I/OD12ts
I/OD12ts
OD12
I/OD12ts
OVT#/
GPIO8
8
OD12
I/OD12ts
SCL
SDA
TEMP_FAULT
GPIO11
9
10
11
INt s
I/OD12
OD1 2
I/OD12ts
GND
12
Ground
DESCRIPTION
0V to +3.3V amplitude fan tachometer input.(Default) /
General purpose I/O function.
This multi-functional pin is programmable.
0V to +3.3V amplitude fan tachometer input. (Default) /
General purpose I/O function.
This multi-functional pin is programmable.
Fan speed control PWM output. This pin is open-drain
Fan speed control PWM output. This pin is open-drain
General purpose I/O function.
General purpose I/O function.
System Management Interrupt.
General purpose I/O function.
This multi-functional pin is programmable.
Over temperature Shutdown Output.
General purpose I/O function.
This multi-functional pin is programmable.
Serial Bus Clock.
Serial Bus bi-directional Data.
Active-Low output. This pin will be a logic LOW when the
temperature of the system or CPU exceeds its limit. (Default) /
General purpose I/O function.
This multi-functional pin is programmable.
Ground.
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W83L785R
Preliminary
Pin Discription, continued
PIN NAME
PIN NO.
TYPE
GPIO13
13
I/OD12ts
+2.5V/
14
AIN
GPIO14
I/OD12ts
DESCRIPTION
General purpose I/O function. Default Open drain.
0V to 2.048V FSR Analog Inputs. (This pin is connected to the
+2.5V).
General purpose I/O function.
This multi-functional pin is programmable.
+1.5V/
15
AIN
I/OD12ts
0V to 2.048V FSR Analog Inputs. (This pin is connected to the
+1.5V).
General purpose I/O function.
GPIO15
This multi-functional pin is programmable.
VCORE/
16
GPIO16
AIN
I/OD12ts
0V to 2.048V FSR Analog Inputs. (This pin connected to
VCORE)
General purpose I/O function.
This multi-functional pin is programmable.
VREF
17
AOUT
CPUT2 /
18
AIN
Reference Voltage.
Thermistor terminal input.(Default) /
PentiumTM II diode input.
PII2
This multi-functional pin is programmable.
CPUT1 /
19
AIN
Thermistor terminal input.(Default) /
PentiumTM II diode input.
PII1
This multi-functional pin is programmable.
VCC
20
POWER
+3.3 VCC power supply input.
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Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
6. FUNCTIONAL DESCRIPTION
6.1 General Description
The W83L785R provides most 4 analog positive inputs, 2 fan speed monitors, 2 sets for fan
PWM (Pulse Width Modulation) control, 2 remote thermal inputs from remote thermistors or 2N3904
transistors or PentiumTM II (Deschutes) thermal diode outputs. W83L785R also provides software
power down this chip to save power, but I2C interface is still working. When W83L785 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 W83L785R provides I2C Serial Bus to read/write internal registers. In the W83L785R, the
I2C address defined value is 0101101.
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
0
7
8
0
7
8
SCL
SDA
0
Start By
Master
1
0
1
1
0
1
R/W
D7
D6
Ack
by
785R
Frame 1
Serial Bus Address Byte
D5
D4
D3
D2
D1
D0
Ack
by
785R
Frame 2
Internal Index Register Byte
0
7
8
SCL (Continued)
SDA (Continued)
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
by
784R
785R
Frame 3
Data Byte
Stop
by
Master
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
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W83L785R
Preliminary
(b) Serial bus read form internal address register followed by the data byte
0
7
8
0
7
8
SCL
SDA
0
Start By
Master
1
0
1
1
0
1
R/W
D7
D6
Ack
by
785R
Frame 1
Serial Bus Address Byte
D5
D4
D3
D2
D1
D0
Ack
by
785R
Frame 2
Internal Index Register Byte
0
1
2
3
4
5
6
7
0
1
0
1
1
0
1 R/W
8
0
1
2
3
4
5
D7
D6
D5
D4
D3
D2
6
7
D1
D0
8
SCL (Continued)
SDA (Continued)
ack
by
785R
Frame 3
Serial Bus Byte
by
784R
Frame 4
Data Byte
Ack
ack
by
785R
Stop by
Master
Figure 2. Serial Bus read from Internal Address Register followed by the Data Byte
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W83L785R
Preliminary
6.3 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 +1.5V voltage can directly connected to these analog inputs. The +2.5V and CPU VOCRE, the
inputs higher than 2.048V, should be reduced a factor with external resistors so as to obtain the input
range. As Figure 3 shows.
VIN0(VCORE)(Max2.048V)
Positive Inputs
+2.5Vin
Pin 16
Pin 15
VIN2 +1.5V
VIN3 VCC
Pin 20
VIN1(Max2.048V) Pin 14
R1
100K, 1%
R2
200K, 1%
8-bit ADC
with
8mV LSB
R
10K, 1%
Typical Thermister
Connection
VREF
Pin 17
CPUT1
Pin 19
RTHM
**The connections of CPUT2
is same as CPUT1
10K, 25 C
Figure. 3.
6.3.1 Voltage Monitor input can not be over 2.048V :
The input voltage VIN1 or Vcore can be expressed as following equation:
VIN1 = V+ 2.5V ×
R2
R1 + R2
. V+2.5V is +2.5V inputs.
The value of R1 and R2 can be selected to 100K Ohms and 200K Ohms, respectively, when the input
voltage is 2.5V. The node voltage of VIN3 can be subject to less than 2.048V for the maximum input
range of the 8-bit ADC. The pin 20 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 W83L785R
and the second function is that this voltage with 3.3V is connected to internal serial resistors to
monitor the +3.3V voltage. The value 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.
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Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
Vin = VCC ×
20 KΩ
≅ 1.1V
20 KΩ + 40 KΩ
where VCC is set to 3.3V.
6.4 Temperature Measurement Machine
The temperature data format is 8-bit two-complement for thermal sensor. The 8-bit temperature data
can be obtained by reading the CR[26h] or CR[27h]. The format of the temperature data is show in
Table 1.
Temperature
8-Bit Digital Output
8-Bit Binary
8-Bit Hex
+125°C
0111,1101
7Dh
+25°C
0001,1001
19h
+2°C
0000,0010
02h
+1°C
0000,0001
01h
+0°C
0000,0000
00h
-1°C
1111,1111
FFh
-2°C
1111,1110
FEh
-25°C
1110,0111
E7h
-55°C
1100,1001
C9h
Table 1.
6.4.1 Monitor temperature from thermistor:
The W83L785R can connect two thermistors to measure three different environment temperature or
remote 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 3, the themistor is connected by a serial resistor with
10K Ohms, then connect to VREF (pin 17).
TM
6.4.2 Monitor temperature from Pentium II
thermal diode or bipolar transistor 2N3904
The W83L785R can alternate the thermistor to Pentium IITM (Deschutes) thermal diode interface or
TM
transistor 2N3904 and the circuit connection is shown as Figure 4. The pin of Pentium II D- is
connected to power supply ground (GND) and the pin D+ is connected to pin PIIx in the W83L785R.
The resistor R=15K ohms should be connected to VREF to supply the diode bias current and the
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W83L785R
Preliminary
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 together to act as a thermal diode.
VREF
R=15K, 1%
Bipolar Transistor
Temperature Sensor
PIITDx
C=3300pF
C
B
2N3904
W83L785R
E
R=30K, 1%
OR
Pentium II
CPU
D+
PIITDx
Therminal
Diode
C=3300pF
D-
Figure 4.
6.4.3 Over Temperature signal (OVT#)
W83L785R provides two external thermal sensors to detect temperature. When detected
temperature exceeds the over-temperature value, pin OVT# will be asserted until the
temperature goes below the hysteresis temperature. Pin OVT# has 2 operating modes:
6.4.3.1 Comparator Mode :
At this mode, temperature exceeding TO causes the OVT# output activated until the temperature
is less than THYST. ( Figure 5)
6.4.3.2 Interrupt Mode:
At this mode, temperature exceeding TO causes the OVT# output activated indefinitely until reset
by reading interrupt status register. Temperature exceeding TO , then OVT# asserted, and then
temperature going below THYST will also cause the OVT# activated indefinitely until reset by
reading temperature sensor1 or sensor2 registers. Once the OVT# is activated by exceeding TO ,
then reset, if the temperature remains above THYST , the OVT# will not be activated
again.( Figure 5)
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W83L785R
Preliminary
To
THYST
(Comparator Mode; default)
OVT#
(Interrupt Mode)
OVT#
*
*
*
*
*Interrupt Reset when Interrupt Status Register is read
Figure 5.
6.4.4 Temperature Fault (Temp_fault #)
W83L785R provides a good protection for temperature. Set pin11(TEMP_FAULT#) to
monitor temperature and enable TEMP_FAULT# function. When VTIN1(Pin19) or VTIN(Pin18)
temperature exceeds Temperature fault limit in CR53,or R54 pin11 TEMP_FAULT# will be
asserted(Figure 6).
TEMP_FAULT limit
TEMP_FAULT#
Figure 6. TEMP_FAULT
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Revision 0.28web
W83L785R
Preliminary
6.5 FAN Speed Count and FAN Speed Control
6.5.1 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 as Figure 7.
Determine the fan counter according to:
135
. × 106
Count =
RPM × Divisor
In other words, the fan speed counter has been read from register CR28 or CR29, the fan speed can
be evaluated by the following equation.
RPM =
135
. × 10 6
Count × Divisor
The default divisor is 2 and defined at CR47.bit0~2, bit4~6 which are three bits for divisor. That
provides very low speed fan counter such as power supply fan. The followed table is an example for
the relation of divisor, RPM, and count.
Divisor
1
2 (default)
4
8
16
32
64
128
Nominal
RPM
8800
4400
2200
1100
550
275
137
68
Time per
Revolution
6.82 ms
13.64 ms
27.27 ms
54.54 ms
109.08 ms
218.16 ms
436.32 ms
872.64 ms
Counts
70% RPM
Time for 70%
153
153
153
153
153
153
153
153
6160
3080
1540
770
385
192
96
48
9.74 ms
19.48 ms
38.96 ms
77.92 ms
155.84 ms
311.68 ms
623.36 ms
1246.72 ms
Table 2.
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W83L785R
Preliminary
+12V
+12V
Pull-up resister
4.7K Ohms
Pull-up resister < 1K
or totem-pole output
+12V
+12V
22K~30K
Fan Input
FAN Out
> 1K
Pin 1
Pin 2
Fan Input
FAN Out
Pin 1
Pin 2
GND
GND
10K
W83L785R
Figure 7-1. Fan with Tach Pull-Up to +12V, or Totern-Pole
Output and Register Attenuator
3.3V Zener
W83L785R
FAN
Connector
Figure 7-2. Fan with Tach Pull-Up to +12V, or
Totem-Pole Putput and Zener Clamp
+5V
+5V
Pull-up resister
4.7K Ohms
Pull-up resister < 1K
or totem-pole output
+5V
1K~2.7K
+5V
Fan Input
FAN Out
> 1K
Pin 1
Pin 2
Fan Input
FAN Out
Pin 1
Pin 2
GND
GND
10K
W83L785R
Figure 7-3. Fan with Tach Pull-Up to +5V, or Totern-Pole
Output and Register Attenuator
3.3V Zener
W83L785R
FAN
Connector
Figure 7-4. Fan with Tach Pull-Up to +5V, or
Totem-Pole Putput and Zener Clamp
6.5.2 Fan speed control
The W83L785R provides four sets for fan PWM speed control. The duty cycle of PWM can be
programmed by a 8-bit register which are defined in the CR81h and CR83h. The default duty cycle is
set to 100%, that is, the default 8-bit registers is set to FFh. The expression of duty can be
represented as follows.
Duty − cycle(%) =
Programmed 8 - bit Register Value
× 100%
255
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W83L785R
Preliminary
+5V
+12V
R1
R1
R2
R2
PNP Transistor
D
G
PWM Clock Input
PNP Transistor
D
G
NMOS
S
PWM Clock Input
+
NMOS
S
C
+
C
FAN
-
FAN
-
Figure 8.
6.6 SMI#
6.6.1 Temperature
Pin SMI# for temperature has 3 modes.
6.6.1.1 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 9-1)
6.6.1.2 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 9-2 )
6.6.1.3 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 9-3)
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W83L785R
Preliminary
TOI
TOI
THYST
THYST
SMI#
*
*
*
*
*
SMI#
*
*
*Interrupt Reset when Interrupt Status Registers are read
Figure 9-1. Comparator Interrupt Mode
Figure 9-2. Two-Times Interrupt Mode
TOI
THYST
SMI#
*
*
*Interrupt Reset when Interrupt Status Registers are read
Figure 9-3. One-Time Interrupt Mode
6.6.2 Voltage
SMI# 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 10-1)
6.6.3 Fan
SMI# 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 10-2)
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*
W83L785R
Preliminary
Voltage High limit
Fan Count limit
Voltage Low limit
SMI#
*
*
*
*
SMI#
*
*
*Interrupt Reset when Interrupt Status Registers are read
Figure 10-1. Voltage SMI# Mode
Figure 10-2. Fan SMI# Mode
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W83L785R
Preliminary
7. SPECIFICATIONS
7.1 Absolute Maximum Ratings
PARAMETER
Power Supply Voltage
Input Voltage
RATING
UNIT
-0.5 to 7.0
V
-0.5 to VCC+0.5
V
0 to +70
°C
-55 to +150
°C
Operating Temperature
Storage Temperature
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
7.2 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
Input High Voltage
VIH
Output Low Voltage
VOL
Output High Voltage
VOH
Input High Leakage
ILIH
Input Low Leakage
ILIL
0.8
2.0
V
V
0.4
V
IOL = 12 mA
V
IOH = - 12 mA
+10
µA
VIN = VDD
-10
µA
VIN = 0V
2.4
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 Threshold 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
V
IOL = 12 mA
Output High Voltage
VOH
V
IOH = - 12 mA
Input High Leakage
ILIH
+10
µA
VIN = VDD
Input Low Leakage
ILIL
-10
µA
VIN = 0V
0.4
2.4
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W83L785R
Preliminary
11.2 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
Output High Voltage
VOH
0.4
V
IOL = 12 mA
V
IOH = -12 mA
V
IOL = 8 mA
V
IOL = 12 mA
0.4
V
IOL = 48 mA
0.8
V
2.4
OD8 - Open-drain output pin with sink capability of 8 mA
Output Low Voltage
VOL
0.4
OD12 - Open-drain output pin with sink capability of 12 mA
Output Low Voltage
VOL
0.4
OD48 - Open-drain output pin with sink capability of 48 mA
Output Low Voltage
VOL
INt - TTL level input pin
Input Low Voltage
VIL
Input High Voltage
VIH
Input High Leakage
ILIH
+10
µA
VIN = VDD
Input Low Leakage
ILIL
-10
µA
VIN = 0 V
INts
2.0
V
- TTL level Schmitt-triggered input pin
Input Low Threshold Voltage
Vt-
0.5
0.8
1.1
V
VCC = 5 V
Input High Threshold Voltage
Vt+
1.6
2.0
2.4
V
VCC = 5 V
Hysteresis
VTH
0.5
1.2
V
VCC = 5 V
Input High Leakage
ILIH
+10
µA
VIN = VCC
Input Low Leakage
ILIL
-10
µA
VIN = 0 V
- 18 -
Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
7.3 AC Characteristics
t
SCL
SCL
t
t HD;SDA
t
HD;DAT
SU;STO
VALID DATA
SDA IN
t SU;DAT
SDA OUT
Serial Bus Timing Diagram
Serial Bus Timing
PARAMETER
SYMBOL
-
SCL clock period
MIN.
MAX.
UNIT
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
- 19 -
Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
8. HOW TO READ THE TOP MARKING
The top marking of W83L785R
W83L785R
2826978Y
046OA
Left: Winbond logo
1st line: Type number W83L785R, R means SSOP (Thickness = 209mil).
2nd line: Tracking code 2 826978Y
2: wafers manufactured in Winbond FAB 2
826978Y: wafer production series lot number
3rd line: Tracking code 046 A A
046: packages made in 2000, week 46
O: assembly house ID; A means ASE, O means OSE, G means Greatek
A: IC revision; A means version A, B means version B
- 20 -
Publication Release Date: Apr. 2001
Revision 0.28web
W83L785R
Preliminary
9. PACKAGE DRAWING AND DIMENSIONS
20 SSOP-209 mil
D
11
2
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN.
DTEAIL A
HE E
A
A1
A2
b
c
D
E
HE
e
L
L1
10
1
NOM
MIN.
NOM
0.05
1.65
1.75
0.22
0.09
1.85
0.002
0.065
0.38
0.21
0.009
10.20
5.30
10.35
5.60
0.395
0.197
7.40
7.80
0.65
8.20
0.291
0.75
1.25
0.073
0.015
0.401
0.209
0.407
0.220
0.307
0.323
0.008
0.0256
0.95
0.10
8
0
0.069
0.004
10.05
5.00
0.55
MAX.
0.079
2.00
Y
θ
MAX.
0.021
0.030
0.050
0.037
0.004
0
8
A2 A
SEATING PLANE
θ
Y
e
b
DETAIL A
SEATING PLANE
L
L1
A1
Headquarters
Winbond Electronics (H.K.) Ltd.
No. 4, Creation Rd. III
Science-Based Industrial Park
Hsinchu, Taiwan
TEL: 886-35-770066
FAX: 886-35-789467
www: http://www.winbond.com.tw/
Rm. 803, World Trade Square, Tower II
123 Hoi Bun Rd., Kwun Tong
Kowloon, Hong Kong
TEL: 852-27516023-7
FAX: 852-27552064
Winbond Electronics
(North America) Corp.
2730 Orchard Parkway
San Jose, CA 95134 U.S.A.
TEL: 1-408-9436666
FAX: 1-408-9436668
Taipei Office
11F, No. 115, Sec. 3, Min-Sheng East Rd.
Taipei, Taiwan
TEL: 886-2-7190505
FAX: 886-2-7197502
TLX: 16485 WINTPE
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.
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 sale.
- 21 -
Publication Release Date: Apr. 2001
Revision 0.28web
10. W83L785R SCHEMATICS
Rev.
0.1:W83L785R application circuit. 3.3VCC
VCC
VOLTAGE SENSORING CIRCUIT
VCC
C1
10u/16V
C2
0.1u
R16
V1
R1
4.7K
U1
GPIO5
GPIO6
}
SMI#
OVT#
EXTSMI#
THRM#
SCL
SDA
R13
4.7K
CPU_VCORE
1
2
3
4
5
6
7
8
9
10
(max 2.048V)
10K
1.5V
R2
4.7K
FANIN1
FANIN2
PWMOUT1
PWMOUT2
To chipset
R
10K
R17
V2
R18
100k
R19
200k
2.5V
VCC
FANIN1/GPIO1
VCC
FANIN2/GPIO2
VTIN1
PWMOUT1
VTIN2
PWMOUT2
VREF
GPIO5
VCORE/GPIO16
GPIO6
+1.5V/GPIO15
SMI#/GPIO7
+2.5V/GPIO14
OVT#/GPIO8
GPIO13
SCL
GND
SDA
TEMP_FAULT#/GPO11
R14
4.7K
20
19
18
17
16
15
14
13
12
11
VTIN1
VTIN2
VREF
V1
V2
V3
GP13
V3
R11
10K
TEMP_FAULT#
W83785R
VCC
VCC
R38
4.7k
TEMPERATURE SENSORING CIRCUIT
VCC
R40
SDA
R29
VREF
R
VTIN1
30K 1%
R44
1K
R45
1K
R46
1K
From PII/PIII CPU
{
SMDAT
SMCLK
R41
C4
CAP
3300p
PIID+
R39
4.7k
0
SCL
0
PIID-
GP6
VREF
GP13
R34
RT1
R
10K 1%
T
GP5
10K 1%
THERMISTOR
VTIN2
NOTE:
ALL GPIO PIN Must add pull-up resistor
PWM1 Circuit for FAN1 speed Control
VCC
R20
R21
4.7K
R26
PWMOUT1
R22
100
Fan5VCC
FOR 5V FAN
PWM1 Circuit for FAN1 speed Control
VCC
4.7K
1K
Q2
MOSFET N
Q1
3906
C3
+
47u
PWMOUT1 is
open-drain default.
D1
1N4148
GND
R21
4.7K
R24
4.7K
JP1
3
2
1
HEADER 3
Signal
Power
R27
2K
FANIN1
R28
10K
W83784R has SMARTFAN function
R31
4.7K
100
R30
4.7K
R32
1K
W83784R has SMARTFAN function
Q2
MOSFET N
D1
1N4148
Q1
3906
C3
+
47u
PWMOUT1 is
open-drain default.
Signal
Power
GND
R24
4.7K
JP1
3
2
1
HEADER 3
R27
27K
FANIN1
R28
10K
Q4
MOSFET N
D2
1N4148
Q3
3906
C5
+
Signal
Power
GND
FOR 12V FAN
+12V
VCC
R30
47u
PWMOUT2 is
open-drain default.
R22
100
1K
PWM2 Circuit for FAN2 speed Control
FOR 5V FAN
Fan5VCC
VCC
R35
R26
PWMOUT1
FOR 12V FAN
+12V
4.7K
W83784R has SMARTFAN function
PWM2 Circuit for FAN2 speed Control
PWMOUT2
R20
JP2
3
2
1
HEADER 3
R32
R31
4.7K
R33
4.7K
R36
2K
FANIN2
PWMOUT2
R35
R37
10K
100
4.7K
1K
Q4
MOSFET N
47u
PWMOUT2 is
open-drain default.
D2
1N4148
Q3
3906
C5
+
Signal
Power
GND
JP2
R33
4.7K
R36
3
2
1
27K
FANIN2
R37
10K
HEADER 3
W83784R has SMARTFAN function
WINBOND ELECTRONICS CORP.
Title
W83L785R Application Circuit
Size
Document Number
Custom
785.SCH
Date:
Friday, March 30, 2001
Rev
0.1
Sheet
1
of
1