W83791G Nuvoton Technology Corporation of America, W83791G Datasheet - Page 63

• Manufacturer Part Number: W83791G
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83791G

• Function: Hardware Monitor
• Topology: ADC
• 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

7.70 FAN 3 Pre-Scale Register ⎯ Index 93h (Bank 0)
Power on default: 01h
PWM frequency = (Input clock / pre-scale) / 256
7.71 FAN 3 Duty Cycle Select Register ⎯ Index 94h (Bank 0)
Power on default: FFh
7
6-0
7-0
BIT
BIT
PWM_CLK_SEL3
PRE_SCALE3[6:0]
F3_DC[7:0]
NAME
NAME
ATTRIBUTE
R/W
ATTRIBUTE
R/W
R/W
Fan 3 Duty Cycle. This 8-bit register determines the
number of input clock cycles, out of 256-cycle period, during
which the PWM output is high. During smart fan3 control
mode, read this register would return smart fan duty cycle.
00h: PWM output is always logical Low.
FFh: PWM output is always logical High.
XXh:
(XX/256*100%) during one cycle.
PWM 3 Input Clock Select. This bit select Fan 3 input
clock to pre-scale divider.
0: 3 MHz
1: 125 KHz
Fan 3 Input Clock Pre-Scale. The divider of input
clock is the number defined by pre-scale. Thus, writing
0 transfers the input clock directly to counter. The
maximum divider is 128 (7Fh).
00h : divider is 1
01h : divider is 2
02h : divider is 3
PWM
- 57 -
:
:
output
DESCRIPTION
Publication Release Date: April 14, 2006
DESCRIPTION
logical
High
W83791D/G
percentage
Revision 1.1
is