UM1524 Datasheet, PDF (18/35 Pages) STMicroelectronics – This document describes the functions

Single-phase energy meter features
UM1524
Now, the meter low-power LCD display and IRDA communication are operational till
pushbutton SW3 is operational.
6.4
6.4.1
6.4.2
Note:
6.4.3
LCD display modes
The STEVAL-IPE012V2 demonstration board offers the user different parameters.
The metering parameters display is configured in a specific manner based upon the power
mode of the meter.
● Meter run mode LCD display
● Meter low-power LCD display.
Meter run mode display
During the main power-on condition, all the critical parameters with details of last month’s
logs for metering parameters are available on the display.
Parameter display is classified in the manner below for mains-on condition:
● Auto-scroll mode
● Pushbutton display mode.
Auto-scroll mode
In auto-scroll mode, the following parameters are displayed on the LCD display one by one.
● Cumulative active energy (KWh)
● Max. demand (KW) of last month
● Average PF of last consumption month.
Auto-scroll mode interval (8sec) is configurable in “autoscroll_display.h” in the firmware.
Pushbutton mode
● In pushbutton mode, the following parameters are displayed on the LCD on pressing
pushbutton SW3. Each button push displays the next pushbutton parameter.
● If the pushbutton is in the pressed condition for 4sec, the board enters auto-calibration
mode.
For more details on auto-calibration, refer to Section 6.1: Auto-calibration mode.
In pushbutton mode, the following parameters are displayed on the LCD.
● All LCD segments on
● Date and time
● Max. demand since last reset
● Cumulative energy for last six months
● Max. demand for last six months
● Instantaneous PF
● Instantaneous voltage
● Instantaneous current
● Instantaneous load in Watt.
18/35
Doc ID 022901 Rev 1