UM1524 datasheet(17/35 Pages) STMICROELECTRONICS

17 / 35 page

UM1524

Single-phase energy meter features

Doc ID 022901 Rev 1

17/35

6.2

EEPROM data log

Total EPROM data log size: 920 bytes.

Multiple parameters are stored in EEPROM, as below:

●

The following metering parameters are logged in EEPROM memory for the current

month and last six months.

–

Cumulative energy (CE) till last month

–

Maximum demand (MD)

–

Cumulative energy (CE) consumed in current month

–

Average PF and averaging count

–

Tamper entries

Four types of tamper data storage are done: earth, reverse, neutral, case tamper.

For each type of tamper, the number of tamper entries per month is four.

●

Two duplicate entries of cumulative energy are stored with CRC-8 value for error

detection.

●

10 bytes stored for calibration data @ start of EEPROM including 3 bytes of CHV, CHP,

and CHS.

●

Last power-down date and time log

●

Overflow count for cumulative energy

–

Number of times cumulative energy overflows from 99999.9 (maximum display

precision).

For more details, refer to Appendix A.

6.3

Power management

The STEVAL-IPE012V2 demonstration board is designed with board power consumption 4

VA.

The board supports two modes of operation:

●

Meter run mode

●

Meter low-power mode.

6.3.1

Meter run mode

When mains power is on, the board operates in run mode. The board components are

powered using capacitive supply using the main power line as the source. In this mode,

rechargeable battery is in charging mode based on trickle charging technique.

6.3.2

Meter low-power mode

When mains power goes down, the onboard microcontroller enters halt mode and metering

IC is off. In this mode, the microcontroller RTC is running and other peripherals are off. In

halt mode, the microcontroller is powered using BT1.

Therefore, pushbutton SW3 is pressed in low-power mode; BT2 supply connects to supply

input of the microcontroller and IRDA section. Therefore, in a button pressed condition, BT2

is the main supply source.

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