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AN2859 Folha de dados(PDF) 17 Page - STMicroelectronics

Nome de Peças AN2859
Descrição Electrónicos  Multiplexed diagnostics of AC switches using two STCC08
PDF  29 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2859 Folha de dados(HTML) 17 Page - STMicroelectronics

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DocID15255 Rev 2
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AN2859
Application example
29
5
Application example
The first step is to calculate R1 and R3 resistor values using Equation 13. The second step
is to choose the R2 and R4 resistor values to fulfil equations14 and 15 (see alsoTable 4).
The third step is to calculate the window detection levels (see Table 5) according to
equations 5, 6, 7, 8, 9, 10, 11, 18, 19, 20, 21, 22, 23 and 24. The window detection digital
levels will be stored in the MCU firmware to distinguish the state of each AC switch.
Table 3. Defined values of the application
Symbol
Value
Unit
IAVF_Max
5mA
VCC_Min
4.5
V
VCC_Max
5.5
V
VAVF_L_Min
0V
VAVF_L_Max
1
V
N (MCU ADC resolution)
10
bits
Table 4. R1, R2, R3 and R4 resistor values
Resistor settings
Standard value (5% tolerance)
R1 = R3 > 1.1 kΩ
2.2 k
Ω
R2
15 k
Ω
R4
6.8 k
Ω
Table 5. Detection window values
Windows detection level
Analog values (Volts)
Equivalent digital values
Max.
Min.
Max.
Min.
V0
1.105
0
252
0
V1
2.514
1.154
501
262
V2
4.214
2.545
802
579
V3
5.5
4.5
1024
> 802



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