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AN1812 Datasheet(PDF) 27 Page - STMicroelectronics

Part # AN1812
Description  In general the ADC embedded in the ST7 microcontroller
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1812 Datasheet(HTML) 27 Page - STMicroelectronics

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AN1812
13 References and bibliography
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Figure 22. Use of Input buffer for voltage measurement
A.2
Case 2: Current measurement
Figure 23 shows the current measurement circuit.
Figure 23. Current measurement
Vin = (Iin + I) * Rsense = Iin * (1 + I / Iin) * Rsense
------------- (1)
I = (V1 - Vin) / R = V1 / (R * (1 + Rsense / R))
------------- (2)
So the following points should be kept in mind while using Rsense.
1.
Rsense should be chosen to correspond to the range of the current to be measured.
2.
Rsense affects the effective value of current I. To minimize its effect, it should be negligible
compared to R. Otherwise ADC has to be compensated.
O/p
C
R
V1
I
VIN
VIN
C
O/p
V1
R
I
VIN
Rsense
Iin



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