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參數資料
型號: W83783
廠商: WINBOND ELECTRONICS CORP
英文描述: CABLE ASSEMBLY; BNC MALE TO BNC FEMALE BULKHEAD; 50 OHM, RG188-DS COAX, DOUBLE SHIELDED; 48" CABLE LENGTH; ; *USES STANDARD 50 OHM INTERFACE CONNECTORS*
中文描述: 監測集成電路
文件頁數: 17/57頁
文件大小: 312K
代理商: W83783
W83783S
Preliminary
Publication Release Date: April 1999
- 12 - Revision 0.55
6.3.2 Monitor negative voltage:
The negative voltage should be connected two series resistors and a positive voltage VREF (is equal
to 3.6V). In the Figure 11, the voltage V3 and V4 are two negative voltage which they are -12V and -
5V respectively. The voltage V3 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 R5=232K ohms and R6=56K ohm. the The input
voltage of node -12VIN can be calculated by following equation.
N
VIN
VREF
V
K
+
K
K
V
12
232
232
56
5
5
=
+
×
+
(
)
(
)
where VREF is equal 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 votage and the express equation is shown as follows.
V
N
VIN
VREF
5
12
1
=
×
Where
is 232K/(232K+56K). If the N2VIN is 0.567 then the V5 is approximately equal to -12V.
The another negative voltage input V6 (approximate -5V) also can be evaluated by the similar
method and the serial resistors can be selected with R7=120K ohms and R8=56K ohms by the
Winbond recommended. The expression equation of V6 With -5V voltage is shown as follows.
V
N VIN
5
VREF
6
1
=
×
Where the
VREF=3.6V and the parameter
5V.
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 evalated to be -
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