W83697HFFDC Information Storage Devices, Inc, W83697HFFDC Datasheet - Page 95

• Manufacturer Part Number: W83697HFFDC
• Description: LPC Interface I/o Plus Game/midi Port, Fan Control, Flash ROM I/f
• Manufacturer: Information Storage Devices, Inc

The Pin 61 is connected to 5VSB voltage. W83697HF monitors this voltage and the internal two serial
resistors are 17K
maximum input voltage.
9.3.2
The negative voltage should be connected two series resistors and a positive voltage VREF (is equal to
3.6V). In the Figure 9.2, the voltage V2 and V3 are two negative voltage which they are -12V and -5V
respectively. The voltage V2 is connected to two serial resistors then is connected to another terminal
VREF which is positive voltage. So as that the voltage node N12VIN can be obtain a posedge voltage if
the scales of the two serial resirtors are carefully selected. It is recommanded from Winbond that the
scale of two serial resistors are R3=232K ohms and R4=56K ohm. The input voltage of node N12VIN can
be calculated by following equation.
If the V2 is equal to -12V then the voltage is equal to 0.567V and the converted hexdecimal data is set
to 35h by the 8-bit ADC with 16mV-LSB.This monitored value should be converted to the real negative
votage and the express equation is shown as follows.
Where
The another negative voltage input V3 (approximate -5V) also can be evaluated by the similar method
and the serial resistors can be selected with R5=120K ohms and R6=56K ohms by the Winbond
recommended. The expression equation of V3 With -5V voltage is shown as follows.
Where the is set to 120K/(120K+56K). If the monitored ADC value in the N5VIN channel is 0.8635,
VREF=3.6V and the parameter
Monitor negative voltage:
is 232K/(232K+56K). If the N2VIN is 0.567 then the V2 is approximately equal to -12V.
and 33K
N VIN
12
V
so that input voltage to ADC is 3.3V which less than 4.096V of ADC
in
is 0.6818 then the negative voltage of V3 can be evalated to be -5V.
(
V
V C C
VREF
V
where VREF is equal 3.6V.
2
3
where VCC is set to 5V.
N
N VIN VREF
12
5 0
5
V
VIN VREF
K
2
- 86 -
) (
5 0
1
1
K
232
3 4
K
K
232
K
2 9 8
56
Publication Release Date: Feb. 2002
.
K
V
)
V
2
W83697HF/F
Revision 0.70