STPM10 datasheet(2/47 Pages) STMICROELECTRONICS

2 / 47 page

Contents

STPM10

2/47

DocID17728 Rev 5

Contents

Schematic diagram.......................................................................... 6

Pin configuration ............................................................................. 7

Electrical ratings ............................................................................. 9

Electrical characteristics .............................................................. 10

Terminology................................................................................... 13

5.1

Measurement error.......................................................................... 13

5.2

ADC offset error .............................................................................. 13

5.3

Gain error ........................................................................................ 13

5.4

Power supply DC and AC rejection ................................................. 13

5.5

Conventions .................................................................................... 13

Typical performance characteristics ........................................... 14

Theory of operation....................................................................... 17

7.1

General operation description ......................................................... 17

7.2

Analog inputs .................................................................................. 17

7.3

ΣΔ A/D converters........................................................................... 18

7.4

Zero-crossing detection................................................................... 19

7.5

Period and line voltage measurement ............................................. 19

7.6

Power supply................................................................................... 21

7.7

Load monitoring .............................................................................. 21

7.8

Error detection................................................................................. 22

7.9

Tamper detection module ............................................................... 22

7.9.1

Detail operational description ........................................................... 23

7.10

Phase compensation....................................................................... 23

7.11

Clock generator............................................................................... 24

7.11.1

RC start-up procedure ...................................................................... 24

7.12

Resetting the STPM10 .................................................................... 25

7.13

Using the STPM10 in microcontroller-based meters ....................... 25

7.14

Energy-to-frequency conversion ..................................................... 25

7.15

Status bit ......................................................................................... 26

7.16

Programming the STPM10.............................................................. 27

7.16.1

Data records ..................................................................................... 27

7.17

Configuration bits ............................................................................ 28

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