STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 43

• Manufacturer Part Number: STEVAL-IPE012V1
• Description: EVAL BOARD ENERGY METER
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-IPE012V1

• Design Resources: STEVAL-IPE012V1 Schematic STEVAL-IPE012V1 BOM
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STPM10BTR, STM8L152
• Primary Attributes: Single Phase with 1 Current Transformer & Shunt
• Secondary Attributes: Tamper Detection
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11462

STPM10
The calibration procedure outputs C
of the meter.
This sensitivity is used to calculate target frequency at the LED pin for nominal voltage and
current values:
with:
From the values above and for both chosen amplification factor A
data, the following target values can be calculated:
Target RMS reading for a given I
Target RMS reading for a given V
The output of the voltage divider is then:
Choosing R
V
Indicating, with I
registers, and with X
calculated, the final values for calibrators can be calculated as:
If the computed final calibration data would fall out of the calibration data range, the energy
meter should be recognized as bad, or the given presumptions and calculations above
should be checked. Otherwise, if the final data of the calibrators would be written into the
energy meter, the RMS readings should be very close to the target values I and V, and the
frequency of the LED output should be very close to the target value f.
LINE
and V
2
V
IP
X
= 500 Ω (connected between V
DIV
) value is obtained:
I
= In * K
A
= (X
and V
I
V
and X
S
* V
A
* A
, the real readings on the STPM10 RMS voltage and current
BG
R
X
V
I
V
1
* K
)/ (2 * G
ideal values of RMS current and voltage readings already
= R
Doc ID 17728 Rev 3
= f * B
i
n
f = PM * I
* G
n
:
2
:
X
* (V
v
X
INT
V
V
DIF
and C
I
= (K
* B
= (K
n
* G
* A
X
- V
I
F
n
v
* D
i
DF
i
V
= f * 64
DIV
* V
* I
* V
values, which allow the above power sensitivity
I
* K
and V
UD
A
* G
) / V
n
A
) / 0.875
v
) / 0.875
/ 3600000
/ (f
DIF
* G
DIV
SS
M
* B
DF
), the R
* X
= 789.3 Ω
I
* G
I
/ (V
) = 852
INT
BG
1
resistor (connected between
* B
* 1000) = 1573
I
= 32 and initial calibration
V
)= 145.6 mV
Theory of operation
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