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AS8267 Datasheet(PDF) 22 Page - ams AG

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
Logo AMSCO - ams AG

AS8267 Datasheet(HTML) 22 Page - ams AG

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Data Sheet AS8267 / AS8268
Revision 1.0, 19-Jun-07
Page 22 of 136
Phase Correction
The DSP provides phase correction of the two current channels (i1 and i2) by means of the Sinc
3 decimation
filters in the phase correction block. Only one of the phase correction settings (pcorr_i1 or pcorr_i2) is valid at
a time, depending on which current (i1 or i2) has been selected for the power calculation (sel_i).
The phase correction step size is dependent upon the main oscillator frequency selected (fosc) and the mains
frequency (fmains). Assuming a 3.579545MHz crystal oscillator frequency and 50Hz mains frequency, the phase
can be corrected in steps of 2.41’ or 0.04 degrees.
pcorr
Phase Correction
[unit(s)]
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
1
1
1
1
1
1
1
1
255
0
1
1
1
1
1
1
1
0
254
…
0
0
1
1
1
1
1
1
1
127
0
0
1
1
1
1
1
1
0
126
…
0
0
0
0
0
0
0
1
0
2
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
-1
1
1
1
1
1
1
1
1
0
-2
…
1
1
0
0
0
0
0
0
1
-127
1
1
0
0
0
0
0
0
0
-128
…
1
0
0
0
0
0
0
0
1
-255
1
0
0
0
0
0
0
0
0
-256
One ‘unit’ equals a certain phase shift related to the mains frequency:
8
/
f
f
360
unit
1
osc
mains
×
°
=
[]
8
/
f
f
360
units
#
Correction
Phase
osc
mains
×
°
×
=
°
Example:
°
=
°
=
×
°
=
41
.
2
04023
.
0
8
/
f
f
360
unit
1
osc
mains
255 units = 255 x 0.04023° = 10.26°
where fmains is the mains frequency and fOSC is
the oscillator frequency.



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