STPM10 datasheet(27/47 Pages) STMICROELECTRONICS

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STPM10

Theory of operation

DocID17728 Rev 5

27/47

Bit #

Name

Description

Conditions

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 = 0: line voltage going from the minimum to the

maximum value. (dv/dt > 0)

Output pin check

PIN = 0: output pins are consistent with the data

PIN = 1: output pins are different from 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

All these signal can be read through the SPI interface.

7.16

Programming the STPM10

7.16.1

Data records

The STPM10 has 8 internal data record registers. Every data record consists of a 4-bit

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

which makes a total of 32 bits, or 4 bytes. Figure below shows the data record structure

with the name of the contained information. Each bit of parity nibble is defined as odd parity

of all seven corresponding bits of data nibbles. The first 6 registers are read-only, except

for the 8-bit mode signals in the DFP register (the mode signals are described later in this

paragraph). The last two registers are CFL and CFH.

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