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AN2859 Datasheet(PDF) 21 Page - STMicroelectronics

No. de pieza AN2859
Descripción Electrónicos  Multiplexed diagnostics of AC switches using two STCC08
PDF  29 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2859 Datasheet(HTML) 21 Page - STMicroelectronics

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AN2859
VSTATE signal voltage definition
29
Appendix B
VSTATE signal voltage definition
The VSTATE voltage is defined according to the theorem of superposition applied on the
linear circuits defined on Figures14, 15, 16 and 17 (according to the state of each AC
switch). The voltage resulting (VSTATE) from each source is calculated separately, and the
results are added algebraically. The input current of the MCU A/D conversion block (IA/D) is
neglected.
Figure 14. Equivalent circuit ACS1 and ACS2 are on
Equation 25
Equation 26
Equation 27
VCC
VCC
R1
R2
R3
R4
VAVF2_L
VAVF1_L
AVF
AVF
VSTATE
R1
R2
R4
STCC082
STCC081
MCU
I A/D≈ 0
R3
VAVF1_L
VCC
VCC
VAVF2_L
A / D
conversion
VSTATE
2
R
4
R
4
R
·
AVF2_L
V
·
AVF1_L
V
0
V
STATE
V
+
=
=
R_Min
4
2
R_Max
4
2
AVF_L_Max
0_Max
X
·
R
R
X
·
R
R
·
V
V
⎟
⎠
⎞
⎜
⎝
⎛
+
⎟
⎠
⎞
⎜
⎝
⎛
+
=
0
X
·
R
R
X
·
R
R
·
V
V
R_Max
4
2
R_Min
4
2
AVF_L_Min
0_Min
=
⎟
⎠
⎞
⎜
⎝
⎛
+
⎟
⎠
⎞
⎜
⎝
⎛
+
=



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