STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 41

• 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
7.24
Table 13.
Line RMS voltage
Line RMS current
Power sensitivity
Shunt sensor
Parameter
The DSP then performs the integration of the computed powers into energies. These
integrators are implemented as up/down counters and they can roll over. 20-bit output buses
of the counters are assigned as the most significant part of the energy data records. It is the
responsibility of an application to read the counters at least every second, to avoid missing
any rollover.
STPM10 calibration
Energy meters based on the STPM10 device can be calibrated in a fast and simple way. The
calibration is essentially based on the single calibration of the voltage and current channel
considering their RMS values rather than on the frequency of the output pulse signal. When
the two channels are calibrated, all the other measurements are calibrated too. This allows
the calibration to be performed in only one point, thereby shortening the production time of
the meter.
This procedure is possible due to the following key factors:
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Let's consider the basic information needed to start the calibration procedure:
Working point settings
The typical STPM10 parameters and constants are also known (see
S
=
ω
The device comprises two independent meter channels for line voltage and current,
respectively. Each channel includes its own digital calibrator, to adjust the RMS in the
range of ±12.5% in 256 steps, and a digital filter, to remove any signal DC component.
None of the final results are subject to the calibration procedure because they are
achieved from such corrected signals by mathematical modules implemented by hard-
wired DSP.
The device computes different kinds of energies: active, reactive and apparent. The
active energy is produced without the 2nd harmonic of the line frequency. It also
computes RMS values of measured voltage and current.
The device produces an energy output pulse signal, but information can also be read
through the serial port interface (SPI) and communication channel.
The device has an embedded memory of 56 bits, used for configuration and calibration
purposes. The values of these bits can be read, or they can be changed temporarily
through the SPI communication channel.
⋅
I
2
⋅
V
⋅
2
ω
K
V
I
P
n
=
n
S
VI
2
230 V
5 A
LED: P=128000 pulses/kWh
0.42 mv/A
Doc ID 17728 Rev 3
Value
Table 14
Theory of operation
).
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