STPM01 datasheet(29/56 Pages) STMICROELECTRONICS

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STPM01

Theory of operation

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8.17

Status bits

The STPM01 includes 8 status bits that provide several information on the current meter

status. The status bits are the following:

When STPM01 is used in peripheral mode all these signal can be read through the SPI

interface. See paragraph 16 for details on the Status bit location in the STPM01 data

records.

In standalone mode the BIL signal is available in SCLNLC pin and the BIT signal in the

SDATD pin. All the other signals can be read only through SPI interface.

8.18

Programming the STPM01

Data records

The STPM01 has 8 internal data records registers. Every data record consists of 4-bit parity

code and 28-bit data value where the parity code is computed from the data value, which

makes total of 32 bits or 4 bytes.

The figure below shows the data records structure with the name of the contained

information.

Table 15.

Status bit description

Bit #

Name

Description

Condition

BIL

No load condition

BIL=0: No load condition not detected

BIL=1: No load detected

1BCF

∑∆ signals status

BCF=0:

∑∆ signals alive

BCF=1: one or both

∑∆ signals are stacked

BFR

Line frequency range

BFR=0: Line frequency inside the 45Hz-65Hz 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 is going from the minimum to the maximum value.

(

∆v/∆t >0);

LIN=1: line voltage is going from the maximum to the minimum value.

(

∆v/∆t < 0);

Output pins check

PIN=0: the output pins are consistent with the data

PIN=1: the output pins are different with the data, this means some

output pin is forced to 1 or 0.

HLT

Data Validity

HLT=0: the data records reading are valid.

HLT=1: the data records are not valid. A reset occurred and a restart

is in progress.

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