STPM10 datasheet(26/51 Pages) STMICROELECTRONICS

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Theory of operation

STPM10

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Doc ID 17728 Rev 3

7.15

Status bits

The STPM10 includes 8 status bits which provide information about the current status of the

meter. The status bits are the following:

All these signal can be read through the SPI interface. See Section 7.15: Status bits for

details on the status bit location in the STPM10 data records.

Table 10.

Status bit description

Bit #

Name

Description

Condition

BIL

No-load condition

BIL = 0: No-load condition not detected

BIL = 1: No-load condition detected

1BCF

Σ Δ signals status

BCF = 0:

Σ Δ signals active

BCF = 1: One or both

Σ Δ signals are stacked

BFR

Line frequency range

BFR = 0: Line frequency within the 45 Hz - 65 Hz range

BFR = 1: Line frequency out of range

BIT

Tamper condition

BIT = 0: Tamper not detected

BIT = 1: Tamper detected

MUX

Current channel selection

MUX = 0: Primary current channels selected by the tamper

module

MUX = 1: Secondary current channels selected by the tamper

module

LIN

Trend of the line voltage

LIN = 0: Line voltage going from the minimum to the maximum

value. (dv/dt > 0)

LIN = 1: Line voltage going from the maximum to the minimum

value. (dv/dt < 0)

Output pin check

PIN = 0: Output pins are consistent with the data

PIN = 1: Output pins are different with the data, this means an

output pin is forced to 1 or 0

HLT

Data validity

HLT = 0: Data records reading are valid.

HLT = 1: Data records are not valid. A reset occurred and a

restart is in progress

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