STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 11

• Manufacturer Part Number: STEVAL-IPE012V1
• Description: EVAL BOARD ENERGY METER
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-IPE012V1

• Design Resources: STEVAL-IPE012V1 Schematic STEVAL-IPE012V1 BOM
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STPM10BTR, STM8L152
• Primary Attributes: Single Phase with 1 Current Transformer & Shunt
• Secondary Attributes: Tamper Detection
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11462

UM0981
5.3
5.3.1
5.3.2
5.3.3
5.4
5.4.1
5.5
5.6
Power supply section
Capacitive power supply is used to build 3.6 V for the metering IC and microcontroller
section.
Programmable voltage reference U5
A U5 TL431AI (package TO-92) is used to regulate the 3.6 V supply.
Current sensor CT1
CT1 E4623-X002 (2500 turns, series resistance: 61.5 Ω) is the sensor for the primary
current channel.
Shunt RS1
RS1 500uOHM is the sensor for the secondary current channel.
Neutral missing power supply section
The neutral missing power supply section is operational in the case of neutral missing
tamper. In case of a neutral missing tamper condition, neutral is disconnected from the
energy meter. Therefore, there is no voltage input and so no output would be generated by
the main capacitive power supply. However, in the case of load present, there would be a
valid input signal on the current channel so energy would be consumed. As the voltage on
the neutral channel is zero, so is the power (P = V x I). In order to understand the energy
consumed in this case, the neutral missing power supply section provides the voltage supply
to the STPM metering IC. A zero crossing signal of 50 Hz is provided to the VIP pin of
STPM, so STPM now calculates the energy consumption at a nominal voltage level of 240 V.
Current sensor CT2
CT2 is used to develop the power supply for the board using a diode full wave rectifier circuit
in neutral missing condition.
EEPROM U3 section
EEPROM M24C32-RMN6P (package: SO8, 32 Kbit) is interfaced to the microcontroller
using an I
consecutive months is logged as months in EEPROM. For more details about EEPROM
data logging, refer to
LCD section
LCD J3 is the connector for the external 18* 4 LCD glass. LCD glass OPT6089A (operating
voltage 3 V, duty 1/4, bias 1/3) offers various energy meter specific symbols. LCD glass is
driven by the microcontroller internal LCD driver.
2
C bus. Cumulative energy, MD, average PF and tamper information for seven
Section 6.2: EEPROM data
Doc ID 17778 Rev 1
log.
Hardware details
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