W83782G Nuvoton Technology Corporation of America, W83782G Datasheet - Page 18

• Manufacturer Part Number: W83782G
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83782G

• Output Type: I²C™, ISA
• Function: Hardware Monitor
• Topology: ADC, Fan Speed Counter, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Temperature Sensor Function: Temp Sensor
• Operating Temperature (min): -40C
• Operating Temperature (max): 120C
• Operating Supply Voltage (typ): 5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Fan speed control
The W83782D/G provides four sets for fan PWM speed control. The duty cycle of PWM can be
programmed by an 8-bit registers which are defined in the Bank0 CR5A, CR5B, CR5E, and CR5F.
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.
Connector
Connector
Figure 13-1. Fan with Tach Pull-Up to +5V
Figure 13-3. Fan with Tach Pull-Up to +12V
FAN
FAN
FAN Out
FAN Out
and Zener Clamp
+12V
GND
+12V
GND
+12V
+12V
Duty cycle
−
3.9V Zener
Pull-up resister
4.7K Ohms
Pull-up resister
+5V
Fan Input
Fan Input
> 1K
(%)
Pin 18/19/20
Pin 18/19/20
W83782D
W83782D
=
Programmed 8 - bit Register Value
- 15 -
Connector
Connector
FAN
FAN
Figure 13-4. Fan with Tach Pull-Up to +12V, or
255
FAN Out
Figure 13-2. Fan with Tach Pull-Up to +12V, or Totem-Pole
FAN Out
+12V
GND
+12V
GND
Totem-Pole Putput and Zener Clamp
+12V
+12V
Publication Release Date: April 14, 2005
W83782D/W83782G
Output and Register Attenuator
Pull-up resister < 1K
or totem-pole output
Pull-up resister
4.7K Ohms
14K~39K
3.9V Zener
> 1K
×
100%
Fan Input
Fan Input
10K
Revision 2.0
Pin 18/19/20
Pin 18/19/20
W83782D
W83782D