Download The STPM10 single-phase meter evaluation boards

UM1082
User manual
The STPM10 single-phase meter evaluation boards
Introduction
The STPM01 and STPM10 devices are energy meter ASSPs (application specific standard products),
which address to 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.
The STPM10 is dedicated for peripheral use in microcontroller-based applications only, while the
STPM01 works as a peripheral and as a standalone device, since it can permanently store configuration
and calibration data.
This user manual refers to the following STPM10 single-phase meter evaluation boards:




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 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.
The reading of the following documents is recommended:





STPM10 datasheet
AN2159 application note
AN2299 application note
UM1599 user manual
UM1750 user manual
October 2014
DocID18970 Rev 2
1/18
www.st.com
Contents
UM1082
Contents
1
2
3
Getting started ................................................................................. 3
1.1
Safety rules ....................................................................................... 3
1.2
Conventions ...................................................................................... 3
Board setup ..................................................................................... 4
2.1
Connection for board with two CTs (STEVAL-IPE015V1) ................. 4
2.2
Connection for the board with CT and shunt (STEVAL-IPE016V1)... 4
2.3
Connection for the board with shunt (STEVAL-IPE017V1) ............... 5
2.4
Connection for the board with CT (STEVAL-IPE018V1) ................... 6
Application configuration ............................................................... 7
3.1
4
Microprocessor-based ....................................................................... 7
Communication with the module ................................................... 8
4.1
Module evaluation with PC through the STPM1x evaluation
software ......................................................................................................... 8
4.2
5
Technical data ............................................................................... 10
5.1
6
SPI communication ........................................................................... 9
Electrical parameters ...................................................................... 10
Schematics .................................................................................... 11
6.1
STEVAL-IPE015V1 ......................................................................... 11
6.2
STEVAL-IPE016V1 ......................................................................... 12
6.3
STEVAL-IPE017V1 ......................................................................... 13
6.4
STEVAL-IPE018V1 ......................................................................... 14
6.5
Mechanical outlines......................................................................... 15
7
Power line system migration from 220 V, 50 Hz to 110 V, 60 Hz 16
8
Revision history ............................................................................ 17
2/18
DocID18970 Rev 2
UM1082
Getting started
1
Getting started
1.1
Safety rules
This board can be connected to the 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 by skilled technical personnel (national accident
prevention rules must be observed) only.
Due to the risk of death when this prototype is used on the mains voltage (220 V/110 V),
“skilled technical personnel” only, 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
the device or the corresponding signal; the underlined typeface is used to indicate the
name of the configuration signal and italic is 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 flows into the pin while
sourcing means that the current flows out of the pin.
Timing specifications of signals are relative to the CLKOUT. This signal is fed by a 4.194
MHz onboard 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 present in all equations.
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Board setup
UM1082
2
Board setup
2.1
Connection for board with two CTs (STEVAL-IPE015V1)
The connection of line signals to the module is shown in Figure 1: "Connection of two CTs
to the power line":
1.
2.
3.
4.
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.
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.
The hot line current wire must pass through the hole of the current transformer Tr1
2
becoming a hot load wire using an isolated 4 mm copper wire.
The neutral line current wire must pass through the hole of the current transformer Tr2
2
becoming a neutral load wire using an isolated 4 mm copper wire.
Figure 1: Connection of two CTs to the power line
2.2
Connection for the board with CT and shunt (STEVALIPE016V1)
The connection of line signals to the module is shown in Figure 2: "Connection of CT +
shunt module to the power line":
1.
2.
3.
4.
5.
4/18
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.
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.
The hot line current wire must be placed through the hole of the current transformer Tr
2
becoming a hot load wire using isolated 4 mm copper wire.
The neutral line current wire must be connected to the pole of shunt which is close to
2
pin N of the module using an isolated 4 mm copper wire.
The neutral load current wire must be connected to the pole of shunt which is close to
2
the current transformer using an isolated 4 mm copper wire.
DocID18970 Rev 2
UM1082
Board setup
Figure 2: Connection of CT + shunt module to the power line
2.3
Connection for the board with shunt (STEVAL-IPE017V1)
The connection of line signals to the module is shown in Figure 3: "Connection of shunt
module to the power line":
1.
2.
3.
4.
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.
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.
The neutral current wire must be connected to the pole of the shunt which is close to
2
pin N of the module using an isolated 4 mm copper wire.
The neutral load current wire must be connected to the pole of the shunt which is
2
close to the edge of the module using an isolated 4 mm copper wire.
Figure 3: Connection of shunt module to the power line
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Board setup
2.4
UM1082
Connection for the board with CT (STEVAL-IPE018V1)
The connection of line signals to the module is shown in Figure 4: "Connection of CT
module to the power line":
1.
2.
3.
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.
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.
The hot line current wire must pass through the hole of the current transformer Tr
2
becoming a hot load wire using an isolated 4 mm copper wire.
Figure 4: Connection of CT module to the power line
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UM1082
Application configuration
3
Application configuration
3.1
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. Table 1: "Pin number,
signal name and signal description of connector P1" below describes the signals
corresponding to the pins of this connector. The four SPI signals are multipurpose pins and
they actually reflect the functions of the corresponding pins on the onboard 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 thanks to a dedicated
protocol, it can draw up to 4 mA at +3.0 V from the module.
Table 1: Pin number, signal name and signal description of connector P1
Pin
Name
Functional description of signal
1
Not used
2
Not used
3
GND
Signal reference level 0 V and power supply return
4
SDA
Digital I/O for SPI data signal or tamper indicator
5
SCS
Digital for SPI enable signal
6
SCL
Digital I/O for SPI clock signal or no load condition indicator
7
LED
Device pulsed output
8
SYN
Digital I/O for SPI data direction, latching request or negative power indicator
9
10
Not used
VCC
Power out of +5.0 V. Up to 25 mA can be drawn from this pin
This kind of application may still use any LED element of the module for the purposes
shown in Table 1: "Pin number, signal name and signal description of connector P1" 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.
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Communication with the module
UM1082
4
Communication with the module
4.1
Module evaluation with PC through the STPM1x evaluation
software
The metering module and the device features can be evaluated by a dedicated graphical
user interface running on a PC.
For this purpose, the module should be connected to the PC through a parallel
programmer, shown in Figure 5: "Parallel programmer schematics" or to USB isolated
hardware interface, available as a separate evaluation board with the code STEVALIPE023V1.
Figure 5: Parallel programmer schematics
To communicate with the device through the evaluation software, the selected hardware
programmer has to be connected to both the PC and the evaluation board. Please take
care that pin 1 of the cable is connected with the correct pin on the board, whose mark is
printed on the PCB, close to the edge of the board.
The correct connection for the STEVAL-IPE023V1 is shown in the picture below.
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UM1082
Communication with the module
Figure 6: Connection of the module to the STEVAL-IPE023V1
If the parallel interface is used, the evaluation board must be powered on. If the STEVALIPE023V1 is used, please make sure that jumper J4 is in 2-3 position, in this way it directly
supplies the STPM10 evaluation board with 5 V.
The evaluation software is available on http://www.st.com.
4.2
SPI communication
A host system can communicate with the module using SPI signals and connect via the P1
connector. In fact, it communicates to 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. For details on SPI communication with the device please refer to the AN2159 and to
the device datasheet.
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Technical data
UM1082
5
Technical data
5.1
Electrical parameters
Table 2: "Electrical parameters" summarizes the electrical parameters, which are specified
for VCC = 3.6 V, TAMB = +25 °C, unless otherwise specified.
Table 2: Electrical parameters
Symbol
Test conditions or
comments
Parameter
Min.
Typ.
Max.
Unit
Nominal line
voltage
140
220
300
VRMS
Nominal frequency
45
50
55
Hz
Target applications
VNOM
FL
INOM
Nominal line
current
2
IMAX
Maximal line
current
20
30
ARMS
TAMB
Ambient
temperature
25
85
°C
0.2
0.5
-40
Class of accuracy
ARMS
Digital inputs
Valid also for I/O
pins when they are
used as inputs
IIL
Pull-up
15
µA
VIL
Voltage input low
-0.3
0.25
VCC
V
VIH
Voltage input high
0.75 VCC
5.3
V
0.4
V
Digital outputs
VOL
Voltage output low
IOL = +2 mA
VOH
Voltage output high
IOH = +2 mA
tTR
Transition time
CL = 50 pF,
VCC = 3.2 V
VCC-0.4
V
5
ns
0.1 VCC
V
Stepper outputs
VOL
Voltage output low
IOL = +14 mA
VOH
Voltage output high
IOH = +14 mA
tTR
Transition time
CL=50 pF,
VCC=5.0 V
0.9 VCC
V
5
ns
Power supply
VCC
Supply level
ICC
Quiescent current
VDDA
FL
VCCPOR
10/18
3.165
5
5.5
V
4
5
6
mA
Supply level
2.85
3
3.15
V
Nominal frequency
45.0
50.0
65.0
Hz
Power-on-reset
2.5
DocID18970 Rev 2
V
DocID18970 Rev 2
mains
2
1
W1 W2
GNDA
TR2
VDD
1uF
R2 1k
1uF
C3
L1 220uH
82 2W
R27
D6
D7
DIODE 600V 1A
+
R9
L3
19
18
3
15
17
16
14
13
12
11
1uH
220K
5.1v
D1
GND
4700µF
470nF 630v DIODE 600V 1A C4
C2
R8
220K
R7
2M
R20
2M
R21
LED
Sda
WDG
Scl
ZCR U1
Scs
Vddd
Syn
Vss
CLKout
Vcc
CLKin
Vdda
Vin
Vo STPM10 Vip
Ilp1
Iln2
Iln1
Ilp2
220K
R4 1k
C10
4.7 4.7 10nF
R22 R24
R3 1k
R1 1k
C9
4.7 4.7 10nF
R23 R25
V1
1nF
VARISTOR 300v
0R
R18
Current transformer
GNDA
0R
R17
Current transformer TR1
1uF
20
1
2
4
5
6
8
7
9
10
GNDA
GND
VDD
C11
22nF
R19 43K
R15 100
R5 390
R26 0R
4.194304MHz
Y1
VDD
GNDA
22pF
GNDA
C14 R16 1M
GND
22pF
C13
P1
1
2
3
4
5
6
7
8
9
10
STEVAL-IPE015V1
1nF
C6
Vo
SBS
GND
SDA
SCS
SCL
LED
SYN
SBG
6.1
C8
D4
Schematics
C7
TP1
D5.
1
2
2
2
R12 R11 R13 R14
2.4k 6.8K 6.8K 6.8K
D2
1
6
C5
GNDA
W5 W6
12 Stepper motor
1
1
2
D3
VDD
GND
UM1082
Schematics
Figure 7: STEVAL-IPE015V1 schematic
GIPG23102014825LM
11/18
12/18
DocID18970 Rev 2
W1 W2
2
1
mains
0R
R18
SHUNT
RS2
C9
10nF
R27
R4 1k
R3 1k
220K
D6
220K
C2
R8
2M
R20
2M
220K
R9
LED
Sda
WDG
Scl
ZCR U1
Scs
Vddd
Syn
Vss
CLKout
Vcc
CLKin
Vdda
Vin
Vo STPM10 Vip
Ilp1
Iln2
Iln1
Ilp2
R21
20
1
2
4
5
6
8
7
9
10
R7
10nF
C10
R1 1k
4.7 4.7
R23 R25
R2 1k
1uF
C6
TP1
19
18
3
15
17
16
14
13
12
11
GND
L3 1uH
C3 82 2W
DIODE 600V 1A C4 D1
470nF 630v
+
V1
1nF
D7
5.1v
VARISTOR 300v
DIODE 600V 1A 4700µF
GNDA
GNDA
0R
R17
1uF
C8
VDD
L1 220uH
1uF
1nF
Current Transformer TR1
C7
C5
GNDA
1
GND
VDD
1
C11
22nF
6.8K
D4
2
R14
1
R15 100
R5 390
R26 0R
6.8K
D5.
2
R13
R19 43K
6.8K
R11
D2
2
GNDA
2.4k
1
R12
D3
VDD
4.194304MHz
Y1
VDD
GNDA
22pF
GNDA
22pF
C14 R16 1M C13
GND
SBS
GND
SDA
SCS
SCL
LED
SYN
SBG
VO
P1
1
2
3
4
5
6
7
8
9
10
6.2
1 2 Stepper Motor
W5 W6
2
GND
Schematics
UM1082
STEVAL-IPE016V1
Figure 8: STEVAL-IPE016V1 schematic
GIPG231020140925LM
DocID18970 Rev 2
GIPG231020140936LM
2
1
mains
W1 W2
L1 220uH
R27
R4 1k
R3 1k
C2
220K
R7
10nF
C10
R1 1k
10nF
C9
R2 1k
1uF
C6
D6
220K
R8
2M
220K
R9
19
LED
Sda 18
WDG
Scl 3
U1
ZCR
Scs 15
Vddd
Syn 17
Vss
CLKout 16
Vcc
CLKin 14
Vdda
Vin 13
Vo STPM10 Vip 12
Ilp1
Iln2 11
Iln1
Ilp2
R21
20
1
2
4
5
6
8
7
9
10
TP1
GND
GND
VDD
6.8K
2.4k
1
6.8K
R19 43K
22nF
C11
R15 100
R5 390
6.8K
D5.
D4
2
2
R13 R14
R26 0R
D2
2
R11
1
R12
GNDA
C3 82 2W 470nF 630v DIODE 600V 1A D1
+
V1
1nF
D7
5.1v
VARISTOR 300v
DIODE 600V 1A 4700µF
L3 1uH
GNDA
0R
R18
RS1
SHUNT
1uF
1nF 1uF
VDD
C8
C7
C5
GNDA
1 2 Stepper motor
W5 W6
1
1
2
D3
VDD
GNDA
22pF
C14
GND
GNDA
22pF
R16 1M C13
4.194304MHz
Y1
VO
SBS
GND
SDA
SCS
SCL
LED
SYN
SBG
VDD
P1
1
2
3
4
5
6
7
8
9
10
6.3
GND
UM1082
Schematics
STEVAL-IPE017V1
Figure 9: STEVAL-IPE017V1 schematic
13/18
14/18
DocID18970 Rev 2
2
1
mains
W1 W2
GNDA
GIPG231020141144LM
1nF
2M
R21
+
220K
R8
2M
D7
TP1
19
18
3
15
17
16
14
13
12
11
L3 1uH
5.1v
D1
GND
4700µF
220K
R9
LED
Sda
WDG
Scl
ZCR U1
Scs
Vddd
Syn
Vss
CLKout
Vcc
CLKin
Vdda
Vin
Vo STPM10 Vip
Ilp1
Iln2
Iln1
Ilp2
R20
20
1
2
4
5
6
8
7
9
10
DIODE 600V 1A C4
D6
DIODE 600V 1A
470nF 630v
C2
220K
R7
10nF
C10
R3 1k
82 2W
C9
10nF
R1 1k
R4 1k
R27
1uF
C6
R2 1k
4.7
R25
1uF
C8
VDD
4.7
R23
C3
L1 220uH
0R
R18
V1
TR1
1uF
1nF
VARISTOR 300v
GNDA
0R
R17
Current Transformer
C7
C5
GNDA
1 2 Stepper motor
W5 W6
GNDA
GND
VDD
6.8K
6.8K
2.4k
R19 43K
1
6.8K
R14
2
D4
22nF
C11
R15 100
R5 390
R26 0R
R13
2
D5.
R11
2
D2
R12
1
1
1
2
D3
VDD
GNDA
22pF
C14
GND
GNDA
R16 1M
4.194304MHz
Y1
22pF
C13
Vo
SBS
GND
SDA
SCS
SCL
LED
SYN
SBG
VDD
P1
1
2
3
4
5
6
7
8
9
10
6.4
GND
Schematics
UM1082
STEVAL-IPE018V1
Figure 10: STEVAL-IPE018V1 schematic
UM1082
6.5
Schematics
Mechanical outlines
The size of the PCB of the module can be seen below. The overall volume is determined
by the size of the maximal element, which is the current transformer:
L x W x H = 70 mm x 46 mm x 30 mm.
Figure 11: Mechanical dimensions of PCB
All measurements are given in mm




View is from non-component side
All high elements are dashed
P1 has pins on both side
All mounting holes are equal
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Power line system migration from 220 V, 50 Hz to
110 V, 60 Hz
7
UM1082
Power line system migration from 220 V, 50 Hz to
110 V, 60 Hz
With capacitive power supply, the impedance of capacitor C1 and impedance of load
((VCC+0.7)/(ICC+IZ)) form a voltage divider. All other elements are needed for other reasons,
such as: spike protection and HF rejection.
Therefore, the following guidelines can be used.
If the percentage of line frequency changes, the I CC changes the same percentage
accordingly:
df/f = d ICC / ICC
For a 60 Hz system there is the 20% more current available because C1 impedance is the
major component of the divider, the change of input voltage must be followed by the same
change of C1 impedance, that is dU/U = dZc/Zc.
For a 110 V system, the capacitor C1 is almost doubled, the divider must be designed to
work properly at minimal line voltage, frequency and C1 and maximal I CC and therefore, the
maximal allowable power consumption (500 mW > IZ * VCC) of the Zener diode D12 must
be checked at maximal line voltage, frequency and C1 and minimal I CC.
According to the information below, with the change of power line system from 220 V, 50
Hz to 110 V, 60 Hz, the value of C1 should be changed from 470 nF, 275 VAC to 750 nF,
150 VAC. A 680 nF, 150 VAC element means about 10% less ICC.
No other change to the metering module is necessary because the voltage measurement
range is from 20 to 360 VRMS. The current measurement range is from 0.1 to 20 ARMS, till 30
ARMS. If a wider current range is needed, the current transformers and the cross-section of
primary winding wires must be increased, by running the risk that they do not fit onto the
board of the module. In this case, the module needs to be recalibrated.
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UM1082
8
Revision history
Revision history
Table 3: Document revision history
Date
Revision
13-Feb-2012
1
Initial release.
2
Updated Table 1: "Pin number, signal name and signal description
of connector P1" and Table 2: "Electrical parameters".
Updated Section 2.3: "Connection for the board with shunt
(STEVAL-IPE017V1)" and Section 4.1: "Module evaluation with PC
through the STPM1x evaluation software".
Changed Figure 3: "Connection of shunt module to the power line".
Minor text changes.
23-Oct-2014
Changes
DocID18970 Rev 2
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UM1082
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