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STEVAL-IPE007V1
Mono-phase energy meter based on ST7Flite
Data Brief
Features

Satisfaction of IEC 61036 Accuracy Requirements for Class 1 Meters Cost-Effective: no ASSP used, single ST7F MCU Large voltage and current operative range AFE(Analog Front End) operation amplifier switches Resistor divider used as voltage sensor Works powered from a capacitive power supply RTC interface using SPI for display date and timer Design with other ST7 MCU can be re-used easily Tamper detection: detects, signals and continues to measure accurately under tamper condition Software calibration for analog circuit, PC GUI available External EEPROM for reliable storage of parameters reading LCD module interface for displaying up to 7 parameters Embedded software easily upgradeable through ICC connector available on the board STEVAL-IPE007V1
Description
The board can be used to develop a single-phase power / energy meter with tamper detection based on ST7FLITE. It measures active power, voltage, current, power factor and line frequency in a single-phase distribution environment and displays these parameters in addition to current date and time. It differs from ordinary single-phase meters because it uses two current transformers (CT) to measure active power in both live and neutral wires. This enables the meter to detect, signal, and continue to measure the active energy consumed reliably even after the meter has been tampered. ST7FLite20 is the microcontroller used to perform all the measurements in the meter. This means there is no ASSP (Application Specific Standard Product) used for energy measurement. The active energy consumed is available in the form of frequency-modulated pulse outputs and the accumulated active energy is displayed on the LCD display module (GDM093).

July 2007
Rev 1
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Board schematic
STEVAL-IPE007V1
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Figure 1.
Board schematic
Block diagram
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STEVAL-IPE007V1 Figure 2. Connectors
Board schematic
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Board schematic
STEVAL-IPE007V1
Figure 3.
Power supply
Figure 4.
Current gain
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STEVAL-IPE007V1 Figure 5. Micro
Board schematic
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Board schematic
STEVAL-IPE007V1
Figure 6.
Multiplexer
Figure 7.
RTC
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STEVAL-IPE007V1
Revision history
2
Revision history
Table 1.
Date 20-Jul-2007
Revision history
Revision 1 Initial release. Changes
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STEVAL-IPE007V1
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