ST UM1748 User Manual

Introduction
This user manual describes the EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board.
The STPM3x is an ASSP family of mixed signals designed for high accuracy measurement of power and energy in power line
systems using the Rogowski coil, current transformer or shunt current sensors. According to p/n, the device has up to two
voltages and two current channels, for energy measurement in dual-phase and single-phase (with or without neutral current
monitoring) electricity metering systems.
The STPM3x devices provide instantaneous voltage and current waveforms and calculate voltage and current RMS values,
active, reactive and apparent powers and energies for each channel. Moreover, they embed a full set of calibration and
compensation parameters which allow the meter to fit tight accuracy standards (EN 50470-x, IEC 62053-2x, ANSI12.2x for AC
watt meters). All calculated data, as well as configuration parameters, are stored in internal 32-bit registers accessible through
SPI or UART peripheral. Three boards are available for evaluation purpose:
• EVALSTPM34 board with 2 CT
• EVALSTPM33 board with CT and shunt
• EVALSTPM32 board with shunt
The main features of these boards are:
• 0.2% accuracy single-phase meter reference design
• USB port for connection to the isolated hardware programmer STEVAL-IPE023V1 and PC GUI
• On-board USB isolated connection for UART data exchange to PC GUI (virtual COM port). RS-232 port for UART data
exchange (board version 1 only)
• SPI/UART switch for device peripheral selection
• 2x programmable LEDs on-board
• Digital expansion to external system-on-chip or MCU
• Power supply 3.3 V: external or through the STEVAL-IPE023V1 isolated USB board
• IEC61000 standard compliant
UM1748 - Rev 3 - March 2022
For further information contact your local STMicroelectronics sales office.
EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board
UM1748
User manual
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