W83791D Information Storage Devices, Inc, W83791D Datasheet - Page 26

• Manufacturer Part Number: W83791D
• Description: Hardware Monitor With Speech Synthesizer And Asf Functions
• Manufacturer: Information Storage Devices, Inc

6.6
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 7 shows.
6.6.1 Monitor over 4.096V voltage:
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 W83791D and the second one is
that these voltages are all connected to internal serial resistors to monitor the +5V and 5VSB voltage.
The maximum input voltage of the analog pin is 4.096V because the 8-bit ADC has a 16mv LSB. Actually,
Analog Inputs
Negative Input
Positive Input
Typical Thermister Connection
V3
V4
V1
R1
R7
12
Positive Inputs
VIN
R2
R
10K, 25 C
THM
12VIN
Figure 7.
R5
10K, 1%
19
V
R
**The Connections of VTIN1 and VTIN2
1
5VSB
+1.8Vcore
+1.5VINR0
R
+3.3VIN
are same as VTIN3
1
VINR1
VBAT
VREF
VTIN3
VTIN2
VTIN1
R
2
R
2
N5VIN
R8
Pin 38
Pin 39
Pin 40
N12VIN
Publication Release Date: Aug, 2001
R6
Pin 36
Pin 35
Pin 34
Pin 33
Pin 30
Pin 32
Pin 29
Pin 31
Pin 28
Pin 37
8-bit ADC
16mV LSB
with
W83791D
Preliminary
Revision 0.41