UM1529 Datasheet, PDF (19/35 Pages) STMicroelectronics – This document describes the functioning

UM1529
Single-phase energy meter features
6.5
Meter low-power mode display
In low-power mode, the display is OFF till pushbutton SW3 is pressed. When pushbutton
SW3 is pressed in low-power mode, the display is ON in auto-scroll display mode. The
display is active till pushbutton SW3 is in pressed condition.
6.6
6.6.1
6.6.2
Note:
Tamper detection
STEVAL-IPE020V1 demonstration board supports multiple tamper detection and their
logging in EEPROM.
Tamper types
The following five types of tamper detection are:
● Earth tamper
● Reverse tamper
● Neutral missing tamper
● Case tamper
● Magnetic interference.
LCD symbol for tamper condition
● Earth tamper:
● Reverse tamper:
● Neutral missing tamper:
● Case tamper:
● Magnetic interference:
The three tampers (earth, reverse and neutral missing) are detected using a software
algorithm based on meter readings from metering IC.
In the case of neutral missing tamper detection, the board starts recording energy when the
load current is 2 A or higher.
Case tamper is detected using switch SW2 and magnetic interference is detected using
magnetic sensor U4. The symbol 'BP' is shared for displaying case tamper as well as
magnetic interference. It means that if any of the tampers are detected, symbol 'BP' is
displayed on the LCD.
For tamper definitions, refer to Appendix B: Tamper definitions.
In the present solution, magnetic tamper is not logged in EEPROM. Logging can be easily
done modifying the EEPROM log structure.
Doc ID 022953 Rev 1
19/35