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參數資料
型號: W83791D
廠商: WINBOND ELECTRONICS CORP
元件分類: 模擬信號調理
英文描述: W83791D Winbond H/W Monitoring IC
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封裝: LQFP-48
文件頁數: 27/46頁
文件大小: 636K
代理商: W83791D
W83791D
Preliminary
Publication Release Date: Aug, 2001
Revision 0.41
20
6.6.2 Monitor negative voltage:
The negative voltage should be connected to two series resistors and a positive voltage VREF (equal to 3.6V).
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 R5=232K ohms and R6=56K ohm. The input voltage of
node -12VIN can be calculated by the following equation.
N
VIN
V REF
V
K
+
K
K
V
12
232
232
56
5
5
=
+
×
+
(
)
(
)
where VREF is equal to 3.6V.
If the V
5
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 voltage and the
express equation is shown as follows.
N
VIN
12
=
V
V REF
5
1
×
Where
is 232K/(232K+56K). If the N2VIN is 0.567 then the V5 is approximately equal to -12V.
The other negative voltage input V6 (approximate -5V) can also be evaluated by the similar method and the
serial resistors can be R7=120K ohms and R8=56K ohms by the Winbond recommended. The expression equation
of V6 With -5V voltage is shown as follows.
N VIN
=
V
V REF
6
1
×
Where the
VREF=3.6V and the parameter
is set to 120K/(120K+56K). If the monitored ADC value in the N5VIN channel is 0.8635,
is 0.6818, then the negative voltage of V6 can be evaluated -5V.
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相關代理商/技術參數
參數描述
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W83791SD 制造商:WINBOND 制造商全稱:Winbond 功能描述:H/W MONITORING IC
W83791SG 制造商:WINBOND 制造商全稱:Winbond 功能描述:H/W MONITORING IC
W83792AD 制造商:WINBOND 制造商全稱:Winbond 功能描述:H/W Monitoring IC (CSB Version)
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