W83792G Nuvoton Technology Corporation of America, W83792G Datasheet - Page 27

• Manufacturer Part Number: W83792G
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83792G

• Function: Hardware Monitor
• Topology: ADC, Fan Control, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Type: I²C™
• Output Alarm: Yes
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.7.2
The W83792D/G provides six sets both of PWM and DC mode for fan speed control. The duty cycle of
PWM can be programmed by a 4-bit registers defined in the Bank0 CR[81], CR[83], CR[94],
CR[A3],CR[A4] and CR[A5] . The default duty cycle is set to 100%, that is, the default 4-bit register is
set to 0x8Fh. The expression of duty cycle can be represented as follows.
Figure 5-1. Fan with Tach Pull-Up to +5V
Figure 5-3. Fan with Tach Pull-Up to +12V
Connector
Connector
FAN
FAN
FAN Out
Fan speed control
FAN Out
and Zener Clamp
+12V
GND
+12V
GND
+12V
+12V
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
W83792D
W83792D
Connector
Connector
- 21 -
Figure 5-4. Fan with Tach Pull-Up to +12V, or
FAN
FAN
FAN Out
Figure 5-2. Fan with Tach Pull-Up to +12V, or Totem-Pole
FAN Out
+12V
GND
+12V
GND
Totem-Pole Putput and Zener Clamp
+12V
+12V
Output and Register Attenuator
Publication Release Date: April 26, 2006
Pull-up resister < 1K
or totem-pole output
W83792AD/AG/D/G
Pull-up resister
4.7K Ohms
14K~39K
3.9V Zener
> 1K
Fan Input
Fan Input
10K
Pin 18/19/20
Pin 18/19/20
W83792D
W83792D
Revision 0.9