ST STPM01 User manual

February 2012 Doc ID 018970 Rev 1 1/25
UM1082
User manual
STPM01/10 single-phase meter demonstration boards
Introduction
The STPM01 and STPM10 devices are energy meter ASSPs (application specific standard
products) designed to address a wide range of electricity metering requirements thanks to
their built-in functions such as signal conditioning, signal processing, data conversion,
input/output signals, and voltage reference.
STPM10 is dedicated for peripheral use only in microcontroller based applications, while
STPM01 is able to work as a peripheral but also as a standalone device, since it can
permanently store configuration and calibration data.
This user manual refers to the following STPM01/STPM10 single-phase meter
demonstration boards:
■STEVAL-IPE002V1: STPM01 single-phase meter with two CTs
■STEVAL-IPE003V1: STPM01 single-phase meter with CT and shunt
■STEVAL-IPE004V1: STPM01 single-phase meter with shunt
■STEVAL-IPE015V1: STPM10 single-phase meter with two CTs
■STEVAL-IPE016V1: STPM10 single-phase meter with CT and shunt
■STEVAL-IPE017V1: STPM10 single-phase meter with shunt
■STEVAL-IPE018V1: STPM10 single-phase meter with CT.
These metering modules can be used to build a Class 0.5 single-phase standalone or
microprocessor based meter, with or without Tamper detection, for power line systems of
VNOM=140 to 300 VRMS, INOM/IMAX=2/20 ARMS, fLIN=45 to 65 Hz and TAMB=-40 to +85 °C.
Modules with the STPM01 device come already calibrated.
Reading of the following documents is highly recommended:
■STPM01 and STPM10 device datasheets
■AN2159 application note
■AN2299 application note.
www.st.com

Contents UM1082
2/25 Doc ID 018970 Rev 1
Contents
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Safety rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Board setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Connection for board with two CTs (STEVAL-IPE002V1,
STEVAL-IPE015V1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Connection for board with CT and shunt (STEVAL-IPE003V1,
STEVAL-IPE016V1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Connection for board with shunt (STEVAL-IPE004V1,
STEVAL-IPE017V1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Connection for board with CT (STEVAL-IPE018V1) . . . . . . . . . . . . . . . . . 8
3 Application configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Standalone (only applicable to STEVAL-IPE002V1/003V1/004V1) . . . . . . 9
3.2 Microprocessor based . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Communication with the module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.0.1 PC communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.0.2 SPI communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1 STEVAL-IPE002V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2 STEVAL-IPE003V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.3 STEVAL-IPE004V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 STEVAL-IPE015V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.5 STEVAL-IPE016V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.6 STEVAL-IPE017V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.7 STEVAL-IPE018V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

UM1082 Contents
Doc ID 018970 Rev 1 3/25
6.8 Mechanical outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7 Migrate the power line system from 220 V, 50 Hz into 110 V, 60 Hz . . 23
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

List of figures UM1082
4/25 Doc ID 018970 Rev 1
List of figures
Figure 1. Connection of two CTs module to the power line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Connection of CT + shunt module to the power line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Connection of shunt module to the power line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. Connection of CT module to the power line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Parallel programmer schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. STEVAL-IPE002V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7. STEVAL-IPE003V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8. STEVAL-IPE004V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 9. STEVAL-IPE015V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 10. STEVAL-IPE016V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 11. STEVAL-IPE017V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 12. STEVAL-IPE018V1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 13. Mechanical dimensions of PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

UM1082 Getting started
Doc ID 018970 Rev 1 5/25
1 Getting started
1.1 Safety rules
This board can be connected to mains voltage (220 V/110 V). In the case of improper use,
wrong installation or malfunction, there is a danger of serious personal injury and damage to
property. All operations such as transport, installation, and commissioning, as well as
maintenance, should be carried out only by skilled technical personnel (national accident
prevention rules must be observed).
Due to the risk of death when using this prototype on mains voltage (220 V/110 V), only
“Skilled technical personnel”, who are familiar with the installation, mounting,
commissioning, and operation of power electronic systems and have the qualifications
needed to perform these functions may use this prototype.
As the serial port P1 of the boards is not isolated, for PC connection through the parallel
programmer/reader, the use of an isolated AC power supply to protect the parallel port and
avoid board damage is strongly recommended.
1.2 Conventions
In this user manual, the UPPER CASE is used to indicate the name of the pin of the module
or device or corresponding signal, while an underlined typeface is used to indicate the name
of the configuration signal and italics are used to name software registers. The lowest
analog and digital power supply voltage is called VSS. All voltage specifications for digital
input/output pins are referred to as VSS. The highest OTP writing power supply voltage is
VOTP. The highest power supply voltage of the device is VCC.
Positive currents flow into a pin. Sinking means that the current is flowing into the pin while
sourcing means that the current is flowing out of the pin.
Timing specifications of signals treated by the device are relative to the CLKOUT. This signal
is fed from a 4.194 MHz on-board crystal oscillator.
Timing specifications of the SPI interface signals are relative to the SCLNLC, which do not
need to be in phase with CLKOUT.
A positive logic convention is used in all equations.

Board setup UM1082
6/25 Doc ID 018970 Rev 1
2 Board setup
2.1 Connection for board with two CTs (STEVAL-IPE002V1,
STEVAL-IPE015V1)
The connection of line signals to the module must be done as shown in Figure 1:
1. The hot line voltage wire must be connected to pin F of the module. Normally, this wire
is also connected to the hot line current wire but, during the production or verification
phases, this wire may be connected to a line voltage source.
2. The neutral line voltage wire must be connected to pin N of the module. This wire is
also connected to the neutral line current wire.
3. The hot line current wire must be placed through the hole of the current transformer Tr1
becoming a hot load wire using isolated 4 mm2copper wire.
4. The neutral line current wire must be placed through the hole of the current transformer
Tr2 becoming a neutral load wire using isolated 4 mm2copper wire.
Figure 1. Connection of two CTs module to the power line
2.2 Connection for board with CT and shunt (STEVAL-IPE003V1,
STEVAL-IPE016V1)
The connection of line signals to the module must be done as shown in Figure 2:
1. The hot line voltage wire must be connected to pin F of the module. Normally, this wire
is also connected to the hot line current wire but, during the production or verification
phases, this wire may be connected to a line voltage source.
2. The neutral line voltage wire must be connected to pin N of the module. This wire is
also connected to the neutral line current wire.
3. The hot line current wire must be placed through the hole of the current transformer Tr
becoming a hot load wire using isolated 4 mm2copper wire.
4. The neutral line current wire must be connected to the pole of shunt which is close to
pin N of the module using an isolated 4 mm2copper wire.
5. The neutral load current wire must be connected to the pole of shunt which is close to
the current transformer using an isolated 4 mm2copper wire.
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UM1082 Board setup
Doc ID 018970 Rev 1 7/25
Figure 2. Connection of CT + shunt module to the power line
2.3 Connection for board with shunt (STEVAL-IPE004V1,
STEVAL-IPE017V1)
The connection of line signals to the module must be done as shown in Figure 3:
1. The hot line voltage wire must be connected to pin N of the module. Normally, this wire
is also connected to the hot line current wire but, during the production or verification
phases, this wire may be connected to some line voltage source.
2. The neutral line voltage wire must be connected to pin F of the module. This wire is
also connected to the neutral current wire which passes through the module.
3. The hot current wire must be connected to the pole of the shunt which is close to pin N
of the module using isolated 4 mm2copper wire.
4. The hot load current wire must be connected to the pole of the single-phase which is
close to the edge of the module using isolated 4 mm2copper wire.
Figure 3. Connection of shunt module to the power line
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Board setup UM1082
8/25 Doc ID 018970 Rev 1
2.4 Connection for board with CT (STEVAL-IPE018V1)
The connection of line signals to the module must be done as shown in Figure 4:
1. The hot line voltage wire must be connected to pin F of the module. Normally, this wire
is also connected to the hot line current wire but, during the production or verification
phases, this wire may be connected to a line voltage source.
2. The neutral line voltage wire must be connected to pin N of the module. This wire is
also connected to the neutral line current wire.
3. The hot line current wire must be placed through the hole of the current transformer Tr
becoming a hot load wire using isolated 4 mm2copper wire.
Figure 4. Connection of CT module to the power line
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UM1082 Application configuration
Doc ID 018970 Rev 1 9/25
3 Application configuration
3.1 Standalone (only applicable to STEVAL-
IPE002V1/003V1/004V1)
In this kind of application, a stepper motor display should be connected to pins W5 and W6.
These pins are located between the Tr1 and the P1 connector, as shown in Figure 1. The
on-board metering device is capable of delivering more than 14 mA to the stepper. The user
can select the type of stepper or the constant of the output pulse frequency by changing
both the LVS or KMOT configuration bits (see the STPM01 and STPM10 datasheets for
details).
The “male” connector P1, which is a collection of power and SPI signals would normally be
used during the production phase only to connect the module to the host system so as to
access the configuration bits or read the operation results of the on-board metering device.
But this does not mean that the use of P1 is restricted later. It can be used freely regardless
of the fact that some SPI signals can also be used to drive three indicators.
3.2 Microprocessor based
In this type of application, a control board with a microprocessor should be connected to the
“male” P1 connector of the module using a 10-wire flat cable. Ta bl e 1 below describes the
signals corresponding to the pins of this connector. The four SPI signals are multi-purpose
pins and they actually reflect the functionality of the corresponding pins on the on-board
metering device. By using this type of connection, the control board is able to read data
records or access configuration bits and mode signals of the metering device by means of a
dedicated protocol and it can draw up to 4 mA at +3.0 V from the module.
This kind of application may still use any LED elements of the module for the purposes
shown in Table 1 or it may generate an alternative set of signals from the control board. In
this case, the control board may also recalibrate any result read from the module. Similarly,
Table 1. Pin number, signal name and signal description of connector P1
Pin Name Functional description of signal
1V
OTP
Power IOof +15.0 V during permanent write to OTP cells if no permanent write in
progress, then VOTP is the input. It is read as +2.3 V otherwise VOTP is the input
for externally generated +15.0 V power levels
2 Not used
3 GND Signal reference level 0V and power supply return
4 SDA Digital IO for SPI data signal or Tamper indicator
5 SCS Digital In for SPI enable signal
6 SCL Digital IO for SPI clock signal or no load condition indicator
7V
DD Power out of +5.0 V. Up to 25 mA can be drawn from this pin
8 SYN Digital IO for SPI data direction or latching request or negative power indicator
9 Not used
10 Not used

Application configuration UM1082
10/25 Doc ID 018970 Rev 1
this is also valid for pins W5 and W6, but this is rare because one of the main reasons for
adding a control board is to use an LCD rather than a stepper.
Only for STPM01 modules: If the TSTD configuration bit has not been permanently written
in the device, an application may modify each of its configuration bits. This means that it can
either select the permanently written configuration by clearing the mode signal RD, or it can
first read the permanently written configuration, modify it if necessary, and then download
the new one back to the metering device and set the RD after every power-up restart.

UM1082 Communication with the module
Doc ID 018970 Rev 1 11/25
4 Communication with the module
4.0.1 PC communication
It is possible to evaluate the metering module and the device features through a dedicated
graphical user interface running on a PC. In this case, the module should be connected to
the PC through the parallel programmer, shown below, provided with the board plugged in
connector P1, taking care that pin 1 of the cable is connected with the right pin on the board,
recognizable by the mark printed on the PCB.
The parallel programmer schematics are shown in Figure 5 below.
Figure 5. Parallel programmer schematics
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Communication with the module UM1082
12/25 Doc ID 018970 Rev 1
The GUI can be downloaded from www.st.com/internet/evalboard/product/123767.jsp.
Make sure to power on the measurement module to program the OTP (only for STPM01).
This is not necessary to read and write (not OTP write) the RAM inside the device.
A serial isolated programmer is also available, with part number STEVAL-IPE005V1.
4.0.2 SPI communication
A host system can communicate with the module using SPI signals and connect via the P1
connector. In fact, it communicates with the metering device, which is the key element of the
module. This device always acts as an SPI slave while the host system acts as an SPI
master. A control board of an application or an external system can be considered as a host.
There is also a VOTP
, a high-voltage power level pin on the connector P1. When a host wants
to permanently write some configuration bits in the metering device, a +15 V power level
must be present on the VOTP
. This level must be delivered by the host itself because the
module does not have any on-board charge pump.
For details on implementing SPI communication with the device please refer to the AN2159
application note and to the device datasheet.

UM1082 Technical data
Doc ID 018970 Rev 1 13/25
5 Technical data
5.1 Electrical parameters
Table 2. summarizes the electrical parameters, which are specified for VCC=3.6 V,
TAMB=+25 °C, unless otherwise specified.
Table 2. Electrical parameters
Symbol Parameter Test conditions or
comments Min. Typ. Max. Units
Target applications
VNOM Nominal line voltage 140 220 300 VRMS
FL Nominal frequency 45 50 55 Hz
INOM Nominal line current 2 ARMS
IMAX Maximal line current 20 30 ARMS
TAMB Ambient temperature -40 25 85 °C
Class of accuracy 0.2 0.5
Digital inputs
IIL Pull up
Valid also for IO pins
when they are used as
inputs
15 µA
VIL Voltage input low -0.3 0.25 VCC V
VIH Voltage input high 0.75 VCC 5.3 V
Digital outputs
VOL Voltage output low IOL=+2 mA 0.4 V
VOH Voltage output high IOH=+2 mA VCC-0.4 V
tTR Transition time CL=50 pF, VCC=3.2 V 5ns
Stepper outputs
VOL Voltage output low IOL=+14 mA 0.1 VCC V
VOH Voltage output high IOH=+14 mA 0.9 VCC V
tTR Transition time CL=50 pF, VCC=5.0 V 5ns
OTP programming
VVOTP No programming level Internally generated VDDA-0.65 V
VVOTP Programming level 14 20 V
IVOTP Programming current To program 1 bit at a
time 1.0 1.5 3.0 mA
tWE Programming time To program 1 bit at a
time 100 200 300 µs

Technical data UM1082
14/25 Doc ID 018970 Rev 1
Power supply
VCC Supply level No loads CL=100 nF,
VCC=3.2 V 3.165 3.6 5.5 V
ICC Quiescent current 4 5 6 mA
VDDA Supply level 2.85 3 3.15 V
FLNominal frequency 45.0 50.0 65.0 Hz
VCCPOR Power on reset 2.5 V
Table 2. Electrical parameters (continued)
Symbol Parameter Test conditions or
comments Min. Typ. Max. Units

UM1082 Schematics
Doc ID 018970 Rev 1 15/25
6 Schematics
6.1 STEVAL-IPE002V1
Figure 6. STEVAL-IPE002V1 schematic
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Schematics UM1082
16/25 Doc ID 018970 Rev 1
6.2 STEVAL-IPE003V1
Figure 7. STEVAL-IPE003V1 schematic
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UM1082 Schematics
Doc ID 018970 Rev 1 17/25
6.3 STEVAL-IPE004V1
Figure 8. STEVAL-IPE004V1 schematic
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Schematics UM1082
18/25 Doc ID 018970 Rev 1
6.4 STEVAL-IPE015V1
Figure 9. STEVAL-IPE015V1 schematic
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UM1082 Schematics
Doc ID 018970 Rev 1 19/25
6.5 STEVAL-IPE016V1
Figure 10. STEVAL-IPE016V1 schematic
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Schematics UM1082
20/25 Doc ID 018970 Rev 1
6.6 STEVAL-IPE017V1
Figure 11. STEVAL-IPE017V1 schematic
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