UM1554 datasheet(21/34 Pages) STMICROELECTRONICS

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UM1554

EEPROM log data structure

Doc ID 023381 Rev 1

21/34

6.8

Size overview

Note:

EEPROM data structuring is done in a modular way in order to support future updates.

Reconfigure parameters in header file “emeter_datamgmt.h”, to modify the log structure

entry count.

6.9

Entry structure

●

Calibration data log

CHV, CHP, and CHS are calibration parameters for the current and voltage channel for

the metering IC.

For more details on calibration parameters, refer to metering IC datasheet on www.st.com.

Table 5.

EEPROM parameter size overview

Parameter

Size (in bytes)

Calibration data

10 (3 bytes (CHV, CHP, CHS) + 7 dummy bytes

for future use)

Total cumulative energy duplicate entry 1

7 (4 bytes + 2 bytes + 1 byte (CRC))

Cumulative energy until last month

42 (7*6): without CRC

Maximum demand log

63 (7*(3+3+3))

Monthly cumulative energy log

42 (7*6)

Average PF log

42 (7*4 + 7*2)

Earth tamper log

175 (7*((4*(3+3)) +1))

Reverse log

175 (7*((4*(3+3)) +1))

Neutral missing log

175 (7*((4*(3+3)) +1))

Case tamper log

175 (7*((4*(3+3)) +1))

Total cumulative energy duplicate entry 2

7(4 bytes + 2 bytes + 1 byte (CRC))

Count for CE overflow

1 byte

Power-down entry

6 bytes

Table 6.

Calibration data

Start address

Size

(CHV, CHP, CHS, 7 times 0x00)

0x00

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