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:
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EVALSTPM34 board with 2 CT
EVALSTPM33 board with CT + shunt
EVALSTPM32 board with shunt
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
The main features of these boards are:
April 2014
DocID026226 Rev 1
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www.st.com
Contents
UM1748
Contents
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
Safety rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Recommended readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Getting technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
EVALSTPM34, EVALSTPM33, EVALSTPM32 board . . . . . . . . . . . . . . . . 6
2.1
2.2
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.2.10
Hardware configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Enable and reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Digital output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SPI connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
UART connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Metrology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3
2.4
Connection to the line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Board setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4.1
2.4.2
Connection to PC GUI through the STEVAL-IPE023V1 . . . . . . . . . . . . 14
Connection to PC GUI through RS232 port . . . . . . . . . . . . . . . . . . . . . . 15
2.5
Basic device configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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UM1748
Overview
1
Overview
Figure 1. EVALSTPM34 board
GIPG0804141108LM
Figure 2. EVALSTPM33 board
GIPG0804141112LM
DocID026226 Rev 1
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Overview
Figure 3. EVALSTPM32 board
UM1748
GIPG0804141114LM
1.1
Safety rules
These boards can be connected to mains voltage (230 V/110 V). In case of improper use,
wrong installation or malfunction, there is the risk of serious personal injury and damage to
property. All operations such as: transport, installation, commissioning, and maintenance,
should be carried out by technical skilled people (national accident prevention rules have to
be observed) only.
1.2
Operating conditions
Table 1. Operating conditions
Parameter
V
N
nominal voltage
I
N
nominal current
I
Max
maximum current
C
P
constant pulses
f
line
line frequency
T
OP
operating temperature
Value
230 V
RMS
5 A
RMS
100 A
RMS
1000 imp/kWh
50/60 Hz ±
10%
-40/+85 °
C
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UM1748
Overview
1.3
Recommended readings
This document describes how to use and set up a basic test session with a GUI interface.
Additional information is available in the following documents:
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STPM3x datasheet
AN4470
UM1719
1.4
Getting technical support
All our customers receive free technical assistance through local ST distributor/office or by
visiting www.st.com; upgrades are also available free of charge on www.st.com/metering.
Customers should work with the latest version of software/firmware before contacting us.
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