W83792AG Nuvoton Technology Corporation of America, W83792AG Datasheet - Page 25

• 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

7.6.2
The negative voltage should be connected to two series resistors and a positive voltage VREF (equal
to 2.048V). In the Figure 11, the voltage V3 and V4 are two negative voltages and are -12V and -5V
respectively. The voltage V3 is connected to two serial resistors as well as another positive terminal
VREF. Therefore, the voltage node N12VIN would be a positive voltage if the scale of the two serial
resistors are carefully selected. It is recommended from Winbond that the scale of the two serial
resistors are
by the following equation.
where VREF is equal to 2.048V.
If the V
to 60h by the 8-bit ADC with 8mV-LSB.This monitored value should be converted to the real negative
voltage and the express equation is shown as follows.
Where
The other negative voltage input V6 (approximate -5V) can also be evaluated by the similar method
and the serial resistors can be
expression equation of V6 With -5V voltage is shown as follows.
Where the
VREF=2.048V and the parameter
5
β
Monitor negative voltage:
is equal to -12V then
is 232K/(232K+10K). If the N2VIN is 1.467 then the V5 is approximately equal to -12V.
γ
R5=232K ohms and R6=10K
is set to 120K/(120K+10K). If the monitored ADC value in the N5VIN channel is 1.505,
N
12
VIN
the voltage is equal to 1.467V
R7=120K ohms and R8=10K ohms
γ
=
V
(
is 0.923, then the negative voltage of V6 can be evaluated -5V.
VREF
V
5
6
=
=
N
ohm. The input voltage of node -12VIN can be calculated
N
12
+
5
VIN
V
VIN
5
- 19 -
)
1
1
×
−
−
−
−
(
VREF
VREF
232
β
γ
K
232
Ω
×
and the converted hexdecimal data is set
×
γ
+
K
β
Publication Release Date: April 26, 2006
10
Ω
by the Winbond recommended. The
W83792AD/AG/D/G
K
Ω
)
+
V
5
Revision 0.9