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Data Sheet
Second, Bits[2:0] (CF1SEL[2:0]), Bits[5:3] (CF2SEL[2:0]), and
ADE7854/ADE7858/ADE7868/ADE7878
Table 22. CFxSEL Bits Description
Bits[8:6] (CF3SEL[2:0]) in the CFMODE register decide what
type of power is used at the inputs of the CF1, CF2, and CF3
converters, respectively. Table 22 shows the values that CFxSEL
can have: total active, total reactive (available in the ADE7858 ,
ADE7868 , and ADE7878 only), apparent, fundamental active
(available in the ADE7878 only), or fundamental reactive
(available in the ADE7878 only) powers.
CFxSEL
000
001
Description
CFx signal proportional to the
sum of total phase active
powers
CFx signal proportional to the
sum of total phase reactive
powers ( ADE7858 / ADE7868 /
Registers
Latched When
CFxLATCH = 1
AWATTHR,
BWATTHR,
CWATTHR
AVARHR, BVARHR,
CVARHR
ADE7878 )
INSTANTANEOUS
CFxSEL BITS
IN CFMODE
010
011
100
101 to
111
CFx signal proportional to the
sum of phase apparent powers
CFx signal proportional to the
sum of fundamental phase
active powers ( ADE7878 only)
CFx signal proportional to the
sum of fundamental phase
reactive powers ( ADE7878 only)
Reserved
AVAHR, BVAHR,
CVAHR
AFWATTHR,
BFWATTHR,
CFWATTHR
AFVARHR,
BFVARHR,
CFVARHR
VA
PHASE A ACTIVE
POWER
TERMSELx BITS IN
COMPMODE
2 7
REVPSUMx BIT OF
INSTANTANEOUS
PHASE B ACTIVE
WATT
ACCUMULATOR
STATUS0[31:0]
POWER
VAR
FREQUENCY
CFx PULSE
INSTANTANEOUS
PHASE C ACTIVE
POWER
FWATT 1
FVAR 1
WTHR[47:0]
DIVIDER
CFxDEN
OUTPUT
DIGITAL SIGNAL
PROCESSOR
2 7
1 FWATT AND FVAR FOR ADE7878 ONLY.
Figure 75. Energy-to-Frequency Conversion
Rev. H | Page 61 of 100
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