STPM34 datasheet(83/89 Pages) STMICROELECTRONICS

83 / 89 page

Contents

Schematic diagram ................................................................2

Pin configuration ..................................................................4

Absolute maximum ratings ........................................................7

Electrical characteristics...........................................................8

4.1

Pin programmability ........................................................... 12

Typical application example.......................................................14

Terminology ......................................................................16

6.1

Conventions .................................................................. 16

6.2

Measurement error ............................................................ 16

6.3

ADC offset error............................................................... 16

6.4

Gain error .................................................................... 16

Typical performance characteristics ..............................................17

Theory of operation...............................................................19

8.1

General operation description ................................................... 19

8.2

Functional description of the analog part .......................................... 19

8.2.1

Power management section ............................................... 19

8.2.2

Analog front end ........................................................ 21

8.2.3

Clock generator......................................................... 23

8.2.4

Power-on-reset (POR) and enable (EN) ...................................... 24

8.3

Functional description of the digital part ........................................... 25

8.3.1

Digital front end (SDSx bits) ............................................... 25

8.3.2

Decimation block........................................................ 25

8.3.3

Filter block ............................................................ 26

8.3.4

DC cancellation filter ..................................................... 26

8.3.5

Fundamental component filter.............................................. 26

8.3.6

Reactive filter .......................................................... 26

8.4

Functional description of hardwired DSP .......................................... 27

8.4.1

Active power and energy calculation ......................................... 29

8.4.2

Fundamental active power and energy calculation .............................. 29

8.4.3

Reactive power and energy calculation ....................................... 30

8.4.4

Apparent power and energy calculation ...................................... 31

8.4.5

Sign of power .......................................................... 31

8.4.6

Calculation of power and energy ............................................ 32

8.4.7

RMS calculation ........................................................ 33

8.4.8

Zero-crossing signal ..................................................... 34

STPM32, STPM33, STPM34

Contents

DS10272 - Rev 13

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