AS8267 datasheet(131/136 Pages) AMSCO

Part #	AS8267

Description	Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os

PDF	136 Pages

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Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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131 / 136 page

Data Sheet AS8267 / AS8268

Revision 1.0, 19-Jun-07

Page 131 of 136

13.

Collection of Formulae

Shunt resistor for mains current sensing:

shunt

Where Vp is the peak input voltage to the IC at rated conditions and Ip the peak Imax value of the meter.

CT voltage setting termination resistor for mains current sensing:

)

(

VS =

Where Vin(p) is the peak input voltage to the IC at rated conditions (Vmains; Imax). i.e.: If Gain = 4 then Vin(p) must

be set at 150mVpeak and IL is the CT RMS secondary current at rated conditions (Vmains; Imax)

Voltage divider for the Vmains input for the energy calculation:

mains

R1A+R1B

)

(

)

(

mains

)

(

−

Where Vmains is the peak mains voltage and Vin(P) is the is the peak input voltage to the IC at rated conditions.

Phase shift value of 1 unit of phase correction relative to the mains frequency:

360

unit

osc

mains

ovs

mains

ovs

360

unit

Phase

osc

mains

AS8267 Datasheet(PDF) 131 Page - ams AG