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STPM34 bảng dữ liệu(PDF) 79 Page - STMicroelectronics

tên linh kiện STPM34
Giải thích chi tiết về linh kiện  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
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STPM34 bảng dữ liệu(HTML) 79 Page - STMicroelectronics

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DS10272 Rev 8
79/121
STPM32, STPM33, STPM34
Application design and calibration
121
With the above external components, the maximum measurable values of RMS voltage and
current are:
Equation 25
Equation 26
These values are calculated leaving some available room for the input range with the peak
value and minimizing modulator distortions.
The current resolution value is equal to 4 times LSBIRMS:
Equation 27
Example: current transformer case
This example shows the correct dimensioning of a meter using a current transformer having
the following specification:
The dimension of the voltage channel considers the voltage divider resistor values as
770 k
 and 470 .
IMIN
Vref
calI AI 2
15 k
S
kint

--------------------------------------------------------- A

=
Table 34. Example 1 design data
Parameter
Value
VN nominal voltage
230 VRMS
IN nominal current
5 ARMS
IMax maximum current
40 ARMS
CP constant pulses
1000 imp/kWh



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