W83792G Nuvoton Technology Corporation of America, W83792G Datasheet - Page 26
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W83792G
Manufacturer Part Number
W83792G
Description
IC MONITOR H/W 48-LQFP
Manufacturer
Nuvoton Technology Corporation of America
Datasheet
1.W83792AG.pdf
(97 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
W83792G
Manufacturer:
Nuvoton Technology Corporation of America
Quantity:
10 000
Company:
Part Number:
W83792GЈ¬ CЈ¬ 1E
Manufacturer:
Winbond
Quantity:
1 000
7.7
7.7.1
W83792D/G support 6 sets of fan counting. Fan inputs are provided for signals from fans equipped
with tachometer outputs. The level of these signals should be set to TTL level, and the maximum input
voltage should not be over +5.5V. If the input signals from the tachometer outputs are over the VCC,
the external trimming circuit should be added to reduce the voltage to meet the input specification. The
normal circuit and trimming circuits are shown as Figure 8.
Determine the fan counter according to:
In other words, if the fan speed counter has been read from register CR [28], CR [29], CR [2A], CR
[B8], CR [B9] or CR [BA] , then the fan speed can be evaluated by the following equation.
The default divisor is 2 and defined at CR47, CR5B, and CR5C which are three bits for divisor. This
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.
FAN Speed Count and FAN Speed Control
2 (default)
Fan speed count
DIVISOR
128
16
32
64
1
4
8
NOMINAL RPM
8800
4400
2200
1100
550
275
137
68
RPM
Count
=
=
Count
RPM
Table 2.
- 20 -
. 1
. 1
35
35
×
×
×
×
Divisor
Divisor
10
10
REVOLUTION
109.08 ms
218.16 ms
436.32 ms
872.64 ms
TIME PER
13.64 ms
27.27 ms
54.54 ms
6
6
6.82 ms
W83792AD/AG/D/G
COUNTS
153
153
153
153
153
153
153
153