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AS8228 bảng dữ liệu(PDF) 21 Page - ams AG

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Giải thích chi tiết về linh kiện  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
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Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 21 of 123
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, which is equal to one oversampling sample, or one ‘unit’ in
the table below:
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
360
360
360
1
/
f
f
f
f
t
t
unit
osc
mains
ovs
mains
mains
ovs
×
°
=
×
°
=
×
°
=
8
360
/
f
f
unit
#
Phase
osc
mains
×
°
×
=
Example:
8
360
1
/
f
f
unit
osc
mains
×
°
=
255 units = 255 x 2.41’ = 10.26°
where fmains is the mains frequency and fOSC is
the oscillator frequency.



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