STPM01 datasheet(52/60 Pages) STMICROELECTRONICS

Part #	STPM01

Description	Programmable single phase energy metering IC with tamper detection

PDF	60 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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52 / 60 page

STPM01 calibration

STPM01

52/60

Doc ID 10853 Rev 8

VDIV = (XV * VBG)/ (2 * GDIF * AV * Kv * GDF * GINT * BV)= 145,6 mV

Choosing R2 = 500

Ω (connected between V

I and VSS), the R1 resistor (connected between

VLINE and VIP) value is obtained:

R1 = R2 * (Vn - VDIV) / VDIV = 789,3 Ω

Indicating with IA and VA the real readings on the STPM01 RMS registers of voltage and

current, and with XI and XV ideal values of RMS current and voltage readings already

calculated, the final values for calibrators can be calculated as:

XV = (Kv * VA) / 0.875

XI = (Ki * IA) / 0.875

If the computed final calibration data would fall out of calibration data range, the energy

meter should be recognized as bad or the given presumptions and calculations above

should be checked. Otherwise, if the final data of calibrators would be written into energy

meter, the RMS readings should be very close to target values I and V and the frequency of

LED output should be very close to target value f.

STPM01 Datasheet(PDF) 52 Page - STMicroelectronics