UM1524 datasheet(22/35 Pages) STMICROELECTRONICS

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EEPROM log data structure

UM1524

22/35

Doc ID 022901 Rev 1

Appendix A

EEPROM log data structure

All the parameters below are stored in EEPROM:

●

Calibration data (10 bytes)

(3 bytes of CHV, CHP, CHS then 7 times 0x00)

●

Total cumulative energy

(at two locations - to keep duplicate entries)

●

Total cumulative till last month

(month-wise for the last six months and current month)

●

Maximum demand

(month-wise for the last six months and current month)

●

Cumulative energy

(month-wise for the last six months and current month)

●

Average PF and averaging count

(month-wise for the last six months and current month)

●

Tamper information - earth, reverse, neutral missing, case tamper

(month-wise for the last six months and current month and four entries per month with

count for tamper and date and time details)

●

Count of cumulative energy overflow

●

Date and time of last power-down

Total size required: 920 bytes.

Data storage structure in EEPROM, as follows:

●

Calibration data (CHV, CHP, CHS)

●

CE main entry with CRC

●

N month: CE till last month: MD: CE current month: average PF: tamper

●

N-1 month: CE till last month: MD: CE current month: average PF: tamper

●

N-2 month: CE till last month: MD: CE current month: average PF: tamper

●

N-3 month: CE till last month: MD: CE current month: average PF: tamper

●

N-4 month: CE till last month: MD: CE current month: average PF: tamper

●

N-5 month: CE till last month: MD: CE current month: average PF: tamper

●

N-6 month: CE till last month: MD: CE current month: average PF: tamper

●

CE duplicate copy with CRC

●

Count for cumulative energy overflow

●

Power-down date and time.

Where N is the current month:

●

All parameters are logged for a total of 7 months including one current and the last 6

months

●

In current month log, data is updated at day end and on power-down

●

Total cumulative energy log is updated half-hourly

●

Month serial order is updated at 24:00 hrs of last date of each calendar month.

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