STPM10 datasheet(28/51 Pages) STMICROELECTRONICS

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Theory of operation

STPM10

28/51

Doc ID 17728 Rev 3

Each configuration bit can be written by sending a byte command to STPM10 through its

SPI interface. The procedure to write the configuration bits is described in Section 7.19: SPI

interface

Table 11.

Configuration bit map

Address

Name

n. of

bits

Description (1)

6-bit

binary

DEC

000000

Reserved

000001

MDIV

Measurement frequency range selection:

- MDIV=0: 4.000 MHz to 4.194 MHz

- MDIV=1: 8.000 MHz to 8.192 MHz

000010

Type of internal oscillator selection:

- RC=0:crystal oscillator,

- RC=1:RC oscillator

000011

Reserved

000100

Reserved

000101

PST

Current channel sensor type and gain:

If TMP=0

PST=0: primary is CT x8, secondary is not used, no tamper

PST=1: primary is shunt x32, secondary is not used, no tamper

If TMP=1

PST=0: primary is CT x8, secondary is CT x8, tamper

PST=1: primary is CT x8, secondary is shunt x32, tamper

000110

Reserved

000111

TMP

Tamper enable

001000

FRS

Power calculation when BFR=1

- FRS=0: energy accumulation is frozen, power is set to zero;

- FRS=1: normal energy accumulation and power computation (p=u*i);

001001

MSBF

Bit sequence output during record data reading selection:

- MSBF=0: MSB first

- MSBF=1: LSB first

001010

FUND

This bit swaps the information stored in the type0 (first 20 bits of DAP register)

and type1 (first 20 bits of DFP register) active energy.

- FUND = 0: type 0 contains wide-band active energy, type1 contains

fundamental active energy

- FUND = 1: type 0 contains fundamental active energy, type1 contains wide-

band active energy

001100

LTCH

No-load condition threshold as product between VRMS and IRMS:

LTCH=0

800

LTCH=1

1600

LTCH=2

3200

LTCH=3

6400

001101 13 (1)

001110

KMOT

Selection of pulses for LED:

KMOT=0

Type 0 Active

Energy

KMOT=1

Type 1 Active

Energy

KMOT=2

Reactive

Energy

KMOT=3

Apparent

Energy

001111 15 (1)

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