STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 12

• 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

Terminology
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5.1
5.2
5.3
5.4
5.5
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Terminology
Measurement error
The error associated with the energy measurement made by the STPM10 is defined as:
Percentage error = [STPM10 (reading) - true energy] / true energy
ADC offset error
This is the error due to the DC component associated with the analog inputs of the A/D
converters. Due to the internal automatic DC offset cancellation, the STPM10 measurement
is not affected by DC components in the voltage and current channel. The DC offset
cancellation is implemented in the DSP.
Gain error
The gain error is gain due to the signal channel gain amplifiers. This is the difference
between the measured ADC code and the ideal output code. The difference is expressed as
percentage of the ideal code.
Power supply DC and AC rejection
This parameter quantifies the STPM10 measurement error as a percentage of the reading
when the power supplies are varied. For the PSRRAC measurement, a reading at two
nominal supply voltages (3.3 and 5 V) is taken. A second reading is obtained with the same
input signal levels when an AC (200 mV
Any error introduced by this AC signal is expressed as a percentage of the reading. For the
PSRRDC measurement, a reading at two nominal supply voltages (3.3 and 5 V) is taken. A
second reading is obtained with the same input signal levels when the supplies are varied ±
10%. Any error introduced is again expressed as a percentage of the reading.
Conventions
The lowest analog and digital power supply voltage is called VSS, which represents system
ground (GND). All voltage specifications for digital input/output pins are referred to GND.
Positive currents flow into a pin. Sinking current refers to the current flowing into the pin, and
thus it is positive. Sourcing current means that the current is flowing out of the pin, so it is
negative.
Timing specifications of signals treated by the digital control part are relative to CLKOUT.
This signal is provided by the 4.194 MHz nominal-frequency crystal oscillator or from the
internal RC oscillator. An external source of 4.194 MHz or 8.192 MHz can also be used.
Timing specifications of signals from the SPI interface are relative to the SCL, and there is
no direct relationship between the clock (SCL) of the SPI interface and the clock of the DSP
block. A positive logic convention is used in all equations.
Doc ID 17728 Rev 3
RMS
/100 Hz) signal is introduced on the supplies.
STPM10