Datasheet

Data Sheet ADE7854/ADE7858/ADE7868/ADE7878
Rev. G | Page 61 of 100
Second, Bits[2:0] (CF1SEL[2:0]), Bits[5:3] (CF2SEL[2:0]), and
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.
Table 22. CFxSEL Bits Description
CFxSEL Description
Registers
Latched When
CFxLATCH = 1
000
CFx signal proportional to the
sum of total phase active
powers
AWAT THR,
BWAT THR,
CWAT THR
001
CFx signal proportional to the
sum of total phase reactive
powers (ADE7858/ADE7868/
ADE7878)
AVARHR, BVARHR,
CVARHR
010
CFx signal proportional to the
sum of phase apparent powers
AVAHR, BVAHR,
CVAHR
011
CFx signal proportional to the
sum of fundamental phase
active powers (ADE7878 only)
AFWATTHR,
BFWATTHR,
CFWATTHR
100
CFx signal proportional to the
sum of fundamental phase
reactive powers
(ADE7878 only)
AFVARHR,
BFVARHR,
CFVARHR
101 to
111
Reserved
08510-050
DIGITAL SIGNAL
PROCESSOR
INSTANTANEOUS
PHASE A ACTIVE
POWER
INSTANTANEOUS
PHASE B ACTIVE
POWER
INSTANTANEOUS
PHASE C ACTIVE
POWER
TERMSELx BITS IN
COMPMODE
WTHR[47:0]
FREQUENCY
DIVIDER
2
7
2
7
VA
VAR
FWATT
1
FVAR
1
WATT
CFxSEL BITS
IN CFMODE
REVPSUMx BIT OF
STATUS0[31:0]
CFxDEN
ACCUMULATOR
CFx PULSE
OUTPUT
1
FWATT AND FVAR FOR ADE7878 ONLY.
Figure 75. Energy-to-Frequency Conversion