ST EVALSTPM32 User Manual
September 2015
DocID026226 Rev 2
1/15
www.st.com
UM1748
User manual
EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board
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
RS232 and UART isolated port for connection to PC GUI
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