W83792AG Nuvoton Technology Corporation of America, W83792AG Datasheet - Page 24

• Manufacturer Part Number: W83792AG
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83792AG

• Output Type: I²C™
• Function: Hardware Monitor
• Topology: ADC, Fan Control, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• 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
• Temperature Sensor Function: Temp Sensor
• Resolution: 10b
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.6
The maximum input voltage of the analog pin is 4.096V because the 10-bit ADC has a 4mv LSB.
Actually, the application of the PC monitoring would most often be connected to power supply. The
CPU V-core voltage, +3.3V and battery voltage can directly connect to these analog inputs. The –
5V, –12V and +12V inputs should be reduced a factor with external resistors to meet the input range.
As Figure 4 shows.
7.6.1
The input voltage +12VIN can be expressed as the following equation.
The value of R1 and R2 can be selected to 28K Ohms and 10K Ohms, respectively, when the input
voltage V1 is 12V. The node voltage of +12VIN should be subject to under 4.096V for the maximum
input range of the 8-bit ADC. The pin 13 and pin 29 are discretely connected to the power supply +5V
and 5VSB . There are two functions in these pins with 5V. The first function is to supply internal analog
power in the W83792D and the second one is that these voltages are all connected to internal serial
resistors to monitor the +5V and 5VSB voltage.
*PS : VCORE channel resolution = 2mv VIN0-4 channel resolution = 4mv
Analog Inputs
Monitor over 4.096V voltage:
Negative Input
Positive Input
Typical Thermister Connection
V3
V4
V1
R1
R7
12
Positive Inputs
VIN
R2
R
10K, 25 C
THM
=
12VIN
Figure 4.
R5
- 18 -
10K, 1%
V
R
**The Connections of VTIN1 and VTIN2
1
×
VcoreA
VcoreB
+3.3VIN
R
VBAT
are same as VTIN3
1
VTIN3
VTIN2
VTIN1
VREF
R
+
2
R
2
N5VIN
R8
Pin 38
Pin 39
Pin 40
N12VIN
W83792AD/AG/D/G
R6
Pin 36
Pin 35
Pin 34
Pin 30
Pin 32
Pin 31
Pin 33
Pin 37
4mV LSB
10-bit ADC
with