AN2288 datasheet(13/29 Pages) STMICROELECTRONICS

No de pièce	AN2288

Description	Single-phase energy meter with tamper detection based on ST7FLITE2x

PDF	29 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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13 / 29 page

AN2288

Meter hardware

13/29

factor will change to x8 or when upper half of sinewave after x8 increases after 1.015V, the

active gain factor will change to x2. The Irms will be:

The same logic applies with the x8 voltage multiplier. Below ~0.508V, the gain factor

increases to x32. At this level, when the voltage increases higher than 2.03V, the gain factor

drops back to x8. The Irms can be calculated (using just the upper half of the sinewave):

The same logic applies with the x32 voltage multiplier. Below ~0.508V, the gain factor

increases to x128. At this level, when the voltage increases higher than 2.03V, the gain

factor drops back to x32. The Irms can be calculated (using just the upper half of the

sinewave):

2Irms

shunt

()

5000

------------------------------------------------------------------

0.253V

Irms

13.7

7.818

32.23

---------------------------------

3.32A

Irms

3.32

32.23

131.77

---------------------------------

0.81A

AN2288 Fiches technique(PDF) 13 Page - STMicroelectronics