ST UM2898 User manual

Introduction
The STDES-EMETER1PV1 single-phase smart meter is based on STM32L433VCT6 MCU featuring ARM Cortex-M4 core and
STPM33 IC for electricity metering with an accuracy of 0.1%.
It measures electric energy consumption over defined time intervals and sends collected data back to the utility for monitoring
and billing, also tracking all the tampers, with the correct date and time.
The smart meter meets the most up-to-date smart metering requirements, such as multi-tariff billing, reactive energy
measurement and power quality monitoring to enhance generation, distribution, customer service and billing.
The STDES-EMETER1PV1 comes with an expansion connector to provide GPRS/SubGHz connectivity and a relay control
which allows remotely connecting/disconnecting the load.
The embedded STPM33 IC belongs to an ASSP family of mixed signals designed for high accuracy measurement of power and
energy in power line systems using a Rogowski coil, current transformer or shunt current sensors.
The device provides instantaneous voltage and current waveforms and calculates voltage and current RMS values, active,
reactive and apparent powers and energies for each channel in compliance with accuracy standards (EN 50470-x, IEC
62053-2x, ANSI12.2x for AC watt meters).
The STDES-EMETER1PV1 single-phase smart meter is a fully assembled board developed for performance evaluation only,
not available for sale.
Figure 1. STDES-EMETER1PV1 single-phase smart meter
Fully assembled board developed for
performance evaluation only,
not available for sale
Getting started with the STDES-EMETER1PV1 single phase smart meter
UM2898
User manual
UM2898 - Rev 1 - August 2021
For further information contact your local STMicroelectronics sales office.
www.st.com

1Acronyms and abbreviations
Table 1. List of acronyms
Acronym Definition
ASSP Application-specific standard product
LED Light emitting diode
MCU Microcontroller unit
SPI Serial peripheral interface
RF Radio frequency communication
USB Universal serial bus
UM2898
Acronyms and abbreviations
UM2898 - Rev 1 page 2/31

2Getting started
2.1 Overview
The STDES-EMETER1PV1 features:
• Based on STM32L433VCT6 (100 pins, LQFP) and STPM33
•STPM33 interfaced using SPI with MCU
• Current transformer (CT) and shunt sensing supported for current measurements
• Shunt connected on the primary channel and CT on the secondary
• Active energy difference of two channels signaling tamper condition
• Magnetic tamper detection using Hall effect sensor by MCU interrupt line
• EEPROM interfaced using I²C with MCU to store accumulated energy
• Switch interface for case tamper and terminal cover tamper
• Low power mode supported
• Neutral missing tamper detection implemented using special duty cycling algorithm
• Connectors for GPRS or Sub 1-GHz connectivity
• Measuring RMS/instantaneous voltage, current, kW and power factor (PF)
• Glass LCD (1/8 duty cycle and 20 segments) driven by the MCU LCD controller
2.2 Hardware requirements
The STDES-EMETER1PV1 input power must be supplied by 220 VAC. A load of few watts must be connected at
load end to test the application.
UM2898
Getting started
UM2898 - Rev 1 page 3/31

Figure 2. STDES-EMETER1PV1 smart meter main sections
1. Power supply section
2. 220 VAC input power
3. Load
4. Shunt
5. STPM33 IC
6. RTC battery slot
7. STM32L433VCT6 MCU
8. Programming connector
1
234
5
6
7
8
2.3 System requirements
To run the STDES-EMETER1PV1 single-phase smart meter, you need:
• an STDES-EMETER1PV1
• an ST-LINK/V2 in-circuit debugger/programmer
• a PC/laptop running Windows 7 or 10
• IAR v8.3 development tool chain or STM32 ST LINK utility
• STSYS-NS073.bin software for application programming
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System requirements
UM2898 - Rev 1 page 4/31

3Hardware description
Figure 3. STDES-EMETER1PV1 hardware block diagram
LCD
(1/8 Duty Cycle,20 segment)
SPI1
LCD Bus
EEPROM
GPRS/6LoWPAN
UART1
I2C1
IrDA
UART2
GPIO
GPIO
GPIO
GPIO
GPIO
Case Tamper Detection
Terminal Cover
Relay Control
User Switch Control
STPM33
(METERING)
HALL EFFECT
SENSOR
SPI2 Radio
(Possible to add)
STM32L433VCT6
(100-pin MCU)
Figure 4. STDES-EMETER1PV1 top view
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Hardware description
UM2898 - Rev 1 page 5/31

Figure 5. STDES-EMETER1PV1 bottom view
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Hardware description
UM2898 - Rev 1 page 6/31

4Component description
4.1 STPM33
The STPM33 belongs to a mixed signal IC family designed for high accuracy measurement of power and
energies in power line systems using the Rogowski coil, current transformer or shunt current sensors.
The STPM3x provides instantaneous voltage and current waveforms. It also calculates RMS values of voltage
and currents, active, reactive and apparent power and energies.
The analog section consists of up to two programmable gain low-noise low-offset amplifiers and up to four second
order 24-bit sigma-delta ADCs, two band gap voltage references with independent temperature compensation, a
low drop voltage regulator and DC buffers.
The digital section consists of digital filtering stage, a hardwired DSP, DFE to the input and a serial communication
interface (UART or SPI).
The STPM3x is fully configurable and allows a fast digital system calibration in a single point over the entire
current dynamic range.
4.2 STM32L433VCT6
The STM32L433VCT6 is an ultra-low-power microcontroller based on the high-performance Arm® Cortex®-M4
32-bit RISC core operating at a frequency of up to 80 MHz. The Arm® Cortex®-M4 core features a floating-point
unit (FPU) single precision which supports all Arm® single-precision data processing instructions and data types.
It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application
security.
The STM32L433xx devices embed high-speed memories (Flash memory up to 256 Kbyte, 64 Kbyte of SRAM),
a quad SPI Flash memory interface (available on all packages) and an extensive range of enhanced I/Os and
peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.
The STM32L433xx devices embed several protection mechanisms for embedded Flash memory and SRAM:
readout protection, write protection, proprietary code readout protection and firewall.
The devices offer a fast 12-bit ADC (5 Msps), two comparators, one operational amplifier, two DAC channels,
an internal voltage reference buffer, a low-power RTC, one general-purpose 32-bit timer, one 16-bit PWM timer
dedicated to motor control, four general-purpose 16-bit timers, and two 16-bit low-power timers.
In addition, up to 21 capacitive sensing channels are available. The devices also embed an integrated LCD driver
8x40 or 4x44, with internal step-up converter.
They also feature standard and advanced communication interfaces.
Some independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMP and
comparators, and 3.3 V dedicated supply input for USB. A VBAT input allows to back up the RTC and registers.
Dedicated VDD12 power supplies can be used to bypass the internal LDO regulator when connected to an
external SMPS.
4.3 ALTAIR04-900
The ALTAIR04-900 is a high voltage all-primary-sensing switcher, operating directly from the rectified mains with
minimum additional external parts. It combines a high performance low voltage PWM controller chip and a 900 V
avalanche-rugged power section in the same package.
The controller is in current mode specifically designed for off-line quasi-resonant flyback converters.
The device provides a constant output voltage using the primary-sensing feedback, eliminating the need of an
optocoupler, a secondary voltage reference, and a current sensor, but still maintaining an accurate regulation.
The maximum deliverable output current can be set to increase the end-product safety and reliability in case of
fault events.
Quasi-resonant operation is guaranteed by a transformer demagnetization sensing input which turns on the power
section. The same input also serves the output voltage monitoring, to perform CV regulation, and to achieve
mains-independent maximum deliverable output current (line voltage feed-forward).
The maximum switching frequency is 166 kHz: at light-to-medium load, a special function automatically lowers
the operating frequency maintaining the valley switching operation. When the load is very light, the device enters
a controlled burst mode operation that, along with the built-in high voltage startup circuit and the low operating
current, minimizes the standby power.
UM2898
Component description
UM2898 - Rev 1 page 7/31

5How to run the single-phase smart meter
Step 1. To program the STDES-EMETER1PV1 single-phase smart meter, connect it to the ST-LINK/V2, as
shown in the table and figures below.
Table 2. STDES-EMETER1PV1 and ST-LINK/V2 pin connection
Signal ST-LINK/V2 connector STDES-EMETER1PV1 J21 connector
VCC 1 1
SWCLK 9 2
GND 10 3
SWDIO 7 4
NRST 15 5
Figure 6. STDES-EMETER1PV1 and ST-LINK/V2 pins
(Dotted yellow lines identify pin 1 and pink dotted lines identify pin 5
Figure 7. STDES-EMETER1PV1 and ST-LINK/V2 connection
Step 2. Power the STDES-EMETER1PV1 with 220 VAC.
The power supply on the board converts the 220 V into 3.3 V to power the MCU.
Step 3. Install STM32 ST LINK utility on your PC/laptop to program the MCU.
UM2898
How to run the single-phase smart meter
UM2898 - Rev 1 page 8/31

Step 4. Connect to the target.
Figure 8. STM32 ST LINK utility - target connection
Step 5. Open the binary file.
Figure 9. STM32 ST LINK utility - file opening
UM2898
How to run the single-phase smart meter
UM2898 - Rev 1 page 9/31

Step 6. Enable debug in low power mode.
Figure 10. STM32 ST LINK utility - file selected
Once the STDES-EMETER1PV1 is programmed with the binary file, the LCD displays various values,
one by one, as shown below.
Figure 11. STDES-EMETER1PV1 - LCD display while running
1. Voltage
2. Current
3. Active power
4. Frequency
5. Date
6. Time
7. Accumulative energy
1
2
3
4
5
6
7
UM2898
How to run the single-phase smart meter
UM2898 - Rev 1 page 10/31

6Firmware description
6.1 Overview
The STSW-EMETER1-FW software package for the STDES-EMETER1PV1 includes:
• the STDES-EMETER1PV1 user manual
• STPM33 Library
• STM32L4_Driver
• Application files
6.2 Folder structure
Figure 12. STSW-EMETER1-FW folder structure
1. Startup file
2. User files
3. System files
4. STM32 HAL driver files
5. EEPROM/NVRAM handler files
6. Minishell file
7. Minishell task files
8. Metrology driver files
9. Include files to select ST devices
10. Metrology task files
1
2
34
5
6
7
8
9
10
6.3 APIs
Detailed technical information about the APIs available to the user can be found in a compiled HTML file located
inside the “Documentation” folder of the software package where all the functions and parameters are fully
described.
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Firmware description
UM2898 - Rev 1 page 11/31

6.4 State machine
Figure 13. STSW-EMETER1-FW state machine
INIT State
RUN State
Check for Neutral Missing
TAMPER State
SHUTDOWN State
Wake-Up using RTC
Capture Full wave,
Calculate Energy
and update EEPROM
Store Tampering Details
NO
YES
•INIT State:
– initializes MCU and peripherals
•Check for Neutral Missing:
– checks neutral missing occurs
– if yes, it initializes MCU at lower frequency
– if proper voltage is built at VDD, it reads and stores in the EEPROM
•RUN State:
– refreshes metering data reading by reading STPM33
– updates LCD
– updates EEPROM
•Tamper State:
– if any tamper is detected, stores the details in the EEPROM with the related time
•Capture State in case of Neutral missing:
– captures one full wave and calculates energy
– stores the value in the EEPROM
•SHUTDOWN State:
– in case of Neutral Missing, shuts STPM33 and MCU down for some time (2 seconds in this case)
– periodically wakes up using RTC
•Wake up using RTC State:
– periodically wakes up using RTC
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State machine
UM2898 - Rev 1 page 12/31

7Schematic diagrams
Figure 14. STDES-EMETER1PV1 circuit schematic (1 of 8)
9V
3V3_ALT
5V
PD3_GPIO_EN
PD4_GPIO_MODE
ISO_GND
R30
8.2K
R29
8.2K
D9
STTH108
12
L8
1mH
U6
INS21662687
LDK220U33R
OUT 1 IN
3
GND
2
GND
4
C58
2.2nF,220V
C68
22uF
C23
100nF
T1
1
4
3
2
8
7
6
5
R50
100E
J9
CON1_NEUTRAL
1
+ C63
470uF
D14
STPS1150
C54
47uF,400V
L21
CHOKE CM
2
1
3
4
C53
4.7nF,25V
C65
100nF
R31
100E
C66
22nF/X2
U10
STBB1
VIN
5
VINA
8
EN
6
PGND
3
FB 10
GND
9
MODE/SYNC
7
VOUT 1
SW2 2 SW1 4
ExPad 11
R27
1.3E
D15
STPS1L60A
U5
ALTAIR04-900TR
SOURCE
1
SOURCE
2
VCC
3
GND
4
IREF
5
ZCD/FB
6
COMP
7
NA
8NA 9
NA 10 NA 11
NC 12
DRAIN 13 DRAIN 14 DRAIN 15 DRAIN 16
R51
100K
+
C25
2.2u,25V
R28
1K
R8
33K
L22
2.2uH
R18
51K
R4
6.8M,1W
D23
Green
R32
1K
C59
470nF
D7
STPS1L60A
D16
STPS1150
C55
5F
RV1
460V
21
R10
0
+ C57
470uF
J10
CON1_PHASE
1
NTC2
16E,2.4W
C61
470uF
L20 470uH
U9
UABF1510-3
Plus 1
Minus 3 AC1
2
AC2
4
+ C24
1000uF
D8
P6KE200A
1 2
NTC1 16E,2.4W
C60
1nF,50V
R65
560K
5V_ALTISO_GND
VCC
LOCAL_GND
NEUTRAL_MAIN PHASE_MAIN
ISO_GND
VCC
ZCD
CMP
ISO_GND
LOCAL_GND
CMP
ZCD
LOCAL_GND
NEUTRAL_MAIN
5V_ALT
ISO_GND
PHASE_MAIN
9V
5V_ALT
ISO_GND
ISO_GND
5V_ALT
PD3_GPIO_EN
ISO_GND
PD4_GPIO_MODE
ISO_GND
5V
ISO_GND
3V3_ALT
UM2898 - Rev 1 page 13/31
UM2898
Schematic diagrams

Figure 15. STDES-EMETER1PV1 circuit schematic (2 of 8)
+
-
DGND
DGND
DGND DGND
DGND
DGND
3V3
3V3_ALT
PE8_GPIO
PC1_GPIO
PE7_GPIO
3V3PE14_GPIO
PD0_GPIO 3V3
3V3PD6_GPIO
C21
10nF/0402R72
10K
SW2
TERMINAL COVER OPEN SW
2
3
5
1
4
6
SW3
UP & DOWN
1
2
3
4
R87
10K R84
1M/0402
R80
1M/0402
R83
0E/0402
R85
0E/0402
Q10
STS6P3LLH6
1
2
3
4
8
7
6
5
R81
0E/0402
SW5
MODULE OPEN SW
2
3
5
1
4
6
R86
10K
Q6
STS6P3LLH6
1
2
3
4
8
7
6
5
SW1
TOP COVER OPEN SW
2
3
5
1
4
6
R70
1K
C62
10nF/0402
R88
10K
C22
10nF/0402
J16
ER-14250
1
2
3
D24
BAT60J/SOD323
1 2
R82
1M/0402
3V3
PC1_GPIO
3V3_ALT
PE8_GPIO
PE7_GPIO
BAT
PE14_GPIO 3V3
PD0_GPIO 3V3
PD6_GPIO 3V3
BAT
BATTERY SECTION SWITCHES SECTION
UM2898 - Rev 1 page 14/31
UM2898
Schematic diagrams

Figure 16. STDES-EMETER1PV1 circuit schematic (3 of 8)
EEPROM SECTION
DGND
DGND
PD7_MCU_GPIO_WC
3V3
PB7_I2C1_SDA
PB6_I2C1_SCL
PB12_GPIO
3V3 U7
AH180
OUT
3
GND 2
VDD
1
R39
50K
U1
M24M01-R
DU
1
E1
2
E2
3
VSS
4SDA 5
SCL 6
WC 7
VCC 8
R5
4.7K
C26
10nF
R6
4.7K
C1
10nF
PB6_I2C1_SCL
3V3
PD7_MCU_GPIO_WC
PB7_I2C1_SDA
PB12_GPIO
3V3
HALL SENSOR SECTION
UM2898 - Rev 1 page 15/31
UM2898
Schematic diagrams

Figure 17. STDES-EMETER1PV1 circuit schematic (4 of 8)
DGND
PB4_LCD_SEG5
PB3_LCD_SEG6
PA15_LCD_SEG8
PC9_LCD_SEG9
PA8_LCD_COM0
PC8_LCD_SEG10
PA9_LCD_COM1
PA10_LCD_COM2
PB9_LCD_COM3
PD15_LCD_SEG16
PC10_LCD_COM4
PC11_LCD_COM5
PC12_LCD_COM6
PD2_LCD_COM7
PE1_LCD_SEG1
PE0_LCD_SEG2
PB8_LCD_SEG3
PD14_GPIO_BACKLIGHT
PB5_LCD_SEG4
3V3
PC6_LCD_SEG15
PC7_LCD_SEG14
R37 0
R104 0
R34 0
R102 0
J13
CON22
2
4
6
8
10
12
14
16
18
20
1
3
5
7
9
11
13
15
17
19
21
22
R105 0
R101 0
R48
1K
R74
470E
R63 0
R94 0
R99 0
R38 0
R36 0
R35 0
R33 0
R68
0E
R97 0
R103 0
R91 0
Q7
2STR1215
1
32
R95 0
R46 0
R100 0
R40 0
PA8_LCD_COM0
PA15_LCD_SEG8
PB8_LCD_SEG3
PD2_LCD_COM7
PA9_LCD_COM1
PC9_LCD_SEG9
PB5_LCD_SEG4
PA10_LCD_COM2
PB9_LCD_COM3
PC8_LCD_SEG10
PB4_LCD_SEG5
PC10_LCD_COM4
PC7_LCD_SEG14
PC6_LCD_SEG15
PD15_LCD_SEG16
PE1_LCD_SEG1
PC11_LCD_COM5
PB3_LCD_SEG6
PE0_LCD_SEG2
PC12_LCD_COM6
PD14_GPIO_BACKLIGHT
LCD_K
LCD_K
LCD_A
3V3
UM2898 - Rev 1 page 16/31
UM2898
Schematic diagrams

Figure 18. STDES-EMETER1PV1 circuit schematic (5 of 8)
Connect to GND by default
DEBUG CONN
AGND
AGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
DGND
PA8_LCD_COM0
PA9_LCD_COM1
PA10_LCD_COM2
PC10_LCD_COM4 PC11_LCD_COM5 PC12_LCD_COM6
PD2_LCD_COM7
PA3_USART_RXD
PB11_USART1_TX
PE12_GPIO
PA2_USART_TXD
PA0_SPI1_NSS
PD6_GPIO
PB3_LCD_SEG6 PB4_LCD_SEG5 PB5_LCD_SEG4
PB6_I2C1_SCL
PB7_I2C1_SDA
PB8_LCD_SEG3
PB9_LCD_COM3
PE0_LCD_SEG2 PE1_LCD_SEG1
3V3
GND
GND
PC4_SYN
PC7_LCD_SEG14
PD15_LCD_SEG16
PC5_INT
PC8_LCD_SEG10
PC6_LCD_SEG15
PE10_GPIO PE11_GPIO
PB10_USART1_RX
PA15_LCD_SEG8
PC9_LCD_SEG9
PD7_MCU_GPIO_WC
PE8_GPIO PE7_GPIO
PB0_GPIO_RELAY PB1_GPIO_RELAY
PA7_SPI1_MOSI PA6_SPI1_MISO
PA5_SPI1_SCK
PA1_ZCR
PD0_GPIO
PD14_GPIO_BACKLIGHT
PD12_GPIO
PD11_GPIO
PD10_GPIO
PD9_GPIO
PE14_GPIO
PC2_EN
PB12_GPIO
PD3_GPIO_EN
PD4_GPIO_MODE
PC1_GPIO
C11
6.8pF
L1
470E
TP1
TEST POINT
1
SW4
MD_RESET SW
1
2
3
4
C14
1uF, 10V
J21
SWD
1
2
3
4
5
R1
10k C5
0.1uF, 10V
R24
0E
C4
0.1uF, 10V
U3
STM32L433VCTx
PE2
1
PE3
2
PE4
3
PE5
4
PE6
5
VBAT
6
PC13
7
PC14_OSC32_IN
8
PC15_OSC32_OUT
9
VSS_1
10
VDD_1
11
PH0_OSC_IN
12
PH1_OSC_OUT
13
NRST
14
PC0
15
PC1
16
PC2
17
PC3
18
VSSA
19
VREFMINUS
20
VREFPLUS
21
VDDA
22
PA0
23
PA1
24
PA2
25
PA3
26
VSS_2
27
VDD_2
28
PA4
29
PA5
30
PA6
31
PA7
32
PC4
33
PC5
34
PB0
35
PB1
36
PB2
37
PE7
38
PE8
39
PE9
40
PE10
41
PE11
42
PE12
43
PE13
44
PE14
45
PE15
46
PB10
47
PB11
48
VSS_3
49
VDD_3
50
PB12 51
PB13 52
PB14 53
PB15 54
PD8 55
PD9 56
PD10 57
PD11 58
PD12 59
PD13 60
PD14 61
PD15 62
PC6 63
PC7 64
PC8 65
PC9 66
PA8 67
PA9 68
PA10 69
PA11 70
PA12 71
JTMS 72
VDDUSB 73
VSS_4 74
VDD_4 75
JTCK 76
JTDI 77
PC10 78 PC11 79 PC12 80
PD0 81 PD1 82 PD2 83 PD3 84 PD4 85 PD5 86 PD6 87 PD7 88
PB3 89 PB4 90 PB5 91 PB6 92 PB7 93
PH3_BOOT0 94
PB8 95 PB9 96 PE0 97 PE1 98
VSS_5 99
VDD_5 100
C19
1uF
C8
6.8pF
R2
10k
J1
CR2032
1
2
3
C2
4.7uF, 6.3V
R7
10k
R3 10k
R96
510E
C20
1uF
Y1
32.768KHz
C6
0.1uF, 10V
C3
0.1uF, 10V
J24
HEADER 3X2
2
4
6
1
3
5
C7
0.1uF, 10V
D12
Green
C15
0.1uF, 10V
PD14_GPIO_BACKLIGHT
PE15_GPIO
VSS
PA2_USART_TXD
PB5_LCD_SEG4
VDD
PA3_USART_RXD
PB8_LCD_SEG3
NRST
PE7_GPIO
PB9_LCD_COM3
VDD
PC12_LCD_COM6 PD6_GPIO
VBAT
PC11_LCD_COM5 PD2_LCD_COM7
PD9_GPIO
BOOT0
PA10_LCD_COM2
3V3
PD10_GPIO
3V3
PC10_LCD_COM4 PB7_I2C1_SDA
AVDD
VDD
VDD
PB6_I2C1_SCL
PA5_SPI1_SCK
VSS
PA9_LCD_COM1
PA7_SPI1_MOSI
AVDD
SWDIO
SWCLK
PD11_GPIO
VDD
PB0_GPIO_RELAY
VSS
VSS
PB1_GPIO_RELAY
PE12_GPIO
PB11_USART1_TX
PA8_LCD_COM0
VDD
PE14_GPIO PE11_GPIO
VSS
AGND
AGND
AVDD 3V3
SWCLK
GND
SWDIO
NRST
PE1_LCD_SEG1 PE0_LCD_SEG2 PB3_LCD_SEG6 PB4_LCD_SEG5
PC4_SYN
PE15_GPIO
BOOT03V3
VBATVBAT
PC7_LCD_SEG14
PD15_LCD_SEG16
PC6_LCD_SEG15
PC8_LCD_SEG10
PC9_LCD_SEG9
PD12_GPIO
PD0_GPIO PD7_MCU_GPIO_WC
PC5_INT
PE8_GPIO PE10_GPIO
PB10_USART1_RX
PA15_LCD_SEG8
PA6_SPI1_MISO
PA1_ZCR
VDD
VSS
PD4_GPIO_MODE
PC2_EN
PB12_GPIO
PD3_GPIO_EN
PC1_GPIO
AVDD
VDD
PA0_SPI1_NSS
UM2898 - Rev 1 page 17/31
UM2898
Schematic diagrams

Figure 19. STDES-EMETER1PV1 circuit schematic (6 of 8)
NEUTRAL MISSING SECTION
DGND
DGND
3V3
PA2_USART_TXD
PA3_USART_RXD
3V3
3V3
R11
100E,1W
Q11
2STR2230
3 2
1
C10
1uF
U4
DBLS208GRD
Plus 1
Minus 3 AC1
2
AC2
4
R106 220E R109
1K
PD1
TX
12
C9
1uF
PQ1
RX
1 2
J3
CON2
1
2
U2
INS21829399
LDK220U33R
OUT 1 IN
3
GND
2
GND
4
R108 1K
D13
7V
3V3
PA3_USART_RXD
PA2_USART_TXD
IR SECTION
UM2898 - Rev 1 page 18/31
UM2898
Schematic diagrams

Figure 20. STDES-EMETER1PV1 circuit schematic (7 of 8)
Mount only one resistor
on the basis of the daughterboard
voltage requirement
RELAY SECTION
DGND
DGND
DGND
DGND
PB1_GPIO_RELAY
PB0_GPIO_RELAY
9V
9V
PE11_GPIO
PE10_GPIO
PB10_USART1_RX
PD9_GPIO
PD10_GPIO
PD11_GPIO
PD12_GPIO
PB11_USART1_TX
PE12_GPIO
3V3
5V
J2
HEADER 7X2
2
4
6
8
10
12
14
1
3
5
7
9
11
13
R25 0E
R17 0E
R15
0E
R26 0E
D22
DIODE J25
REALY_CON
1
2
3
Q8
2STR1215
1
32
R71 0E
R13
0E
R22 0E
R75
1K
R77
1K
D21
DIODE
Q9
2STR1215
1
32
R16 0E
RELAY_3
PB0_GPIO_RELAY
RELAY_1
PB1_GPIO_RELAY
9V
RELAY_2
RELAY_1
RELAY_2
9V
RELAY_2
RELAY_3
MOD_POWER_CN1
PD10_GPIO
PE10_GPIO
PD9_GPIO
PE11_GPIO
PB11_USART1_TXPB10_USART1_RX
GND
PE12_GPIO
5V
PD12_GPIO
PD11_GPIO
MOD_POWER_CN1
3V3
5V
STMod+ CONN
(PLC/GSM/RF)
STMod+ SECTION
UM2898 - Rev 1 page 19/31
UM2898
Schematic diagrams

Figure 21. STDES-EMETER1PV1 circuit schematic (8 of 8)
DGND
PA5_SPI1_SCK
PA1_ZCR
PA6_SPI1_MISO
PC5_INT
PC4_SYN
PA7_SPI1_MOSI
ISO_GND
3V3
PA0_SPI1_NSS
PC2_EN
C51
10nF,25V
Y3
16MHz
C38
100nF,16V
L13
10uH
R67
0E
R58
22K
U8
STPM33
VDDA 21
LED2
5
VCC 23
GND_REG 22
INT2
7
CLKIN/XTAL2
2
XTAL1
3
LED1
4
NC 24
VDDD 27
SYN 28 SCS 29
SCL 30
MOSI/RXD 31
MISO/TXD 32
INT1
6
VIN1
10
IIP1
11
IIN1
12
IIP2
13
IIN2
14
NC
15
GND_REF 18
GNDA 20
GND_EX 33
EN
8
CLKOUT/ZCR
1
VIP1
9
NC
16
VREF1 17
VREF2 19
GNDD 26
GNDD_NC 25
C48
22nF,25V
L3
1500E
L6
1500E
C43
150pF,50V
L4
1500E
L7
1500E
R471ME
C47
100nF,16V
C39
150pF,50V
C46
150pF,50V
C33
150pF,50V
R43
10K
C40
150pF,50V
C42
150pF,50V
L14
10uH
R56
100E
R55
470
R60
Shunt
C34 100nF,16V
C35 150pF,50V
L12
10uH
C52
10nF,25V
R661K
R571K
C45
15pF
C41
1uF,25V
R41
10K
R52
270K
R621K
C49
100nF,16V
C36
15pF
R45
100E
C28
150pF,50V
C29
100nF,16V
R49
0E
R64
0E
R54
270K
R44
10K
C32 100uF, 10V
R591K
L2
1500E
R92
0E
C31
150pF,50V
R53
270K
J12
CON1
1
J11
CON1
1
R61
6E
C50
150pF,50V
C27
10nF,25V
C37
150pF,50V
R42
10K
L5
INDUCTOR IRON/SM
L11
10uH
C30
4.7uF,25V
C44
100nF,16V
NEUTRAL_LOAD
ISO_GND
NEUTRAL_MET
PHASE_LOAD
IIP1
IIN2
NEUTRAL_LOAD
PHASE_MET
IIP2
IIN1
PA1_ZCR
VIN1
VREF1
VIP1
3V3
PC4_SYN
PA0_SPI1_NSS
PA7_SPI1_MOSI
PA6_SPI1_MISO
3V3
PA5_SPI1_SCK
PHASE_MET
NEUTRAL_MET
PHASE_LOAD
VIP1 VIN1 IIP2 IIP1 IIN1
PC5_INT
VREF2
IIN2
PC2_EN
UM2898 - Rev 1 page 20/31
UM2898
Schematic diagrams