Datasheet

Data Sheet ADE7854/ADE7858/ADE7868/ADE7878
Rev. G | Page 33 of 100
Voltage Waveform Gain Registers
There is a multiplier in the signal path of each phase voltage.
The voltage waveform can be changed by ±100% by writing
a corresponding twos complement number to the 24-bit signed
voltage waveform gain registers (AVGAIN, BVGAIN, and
CVGAIN). For example, if 0x400000 is written to those registers,
the ADC output is scaled up by 50%. To scale the input by −50%,
write 0xC00000 to the registers. Equation 4 describes mathe-
matically the function of the current waveform gain registers.
Voltage Waveform =








+×
23
2
1
Register
GainVoltageofContent
OutputADC
(4)
Changing the content of the AVGAIN, BVGAIN, and CVGAIN
registers affects all calculations based on its voltage; that is, it
affects the corresponding phase active/reactive/apparent energy
and voltage rms calculation. In addition, waveform samples are
scaled accordingly.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE78xx work on 32-, 16-, or 8-bit words,
and the DSP works on 28 bits. As presented in Figure 35, the
AVGAIN, BVGAIN, and CVGAIN registers are accessed as 32-
bit registers with four MSBs padded with 0s and sign extended
to 28 bits.
Voltage Channel HPF
As explained in the Current Channel HPF section, the ADC
outputs can contain a dc offset that can create errors in power
and rms calculations. HPFs are placed in the signal path of the
phase voltages, similar to the ones in the current channels. The
HPFDIS register can enable or disable the filters. See the
Current Channel HPF section for more details.
Voltage Channel Sampling
The waveform samples of the voltage channel are taken at the
output of HPF and stored into VAWV, VBWV, and VCWV
24-bit signed registers at a rate of 8 kSPS. All power and rms
calculations remain uninterrupted during this process. Bit 17
(DREADY) in the STATUS0 register is set when the VAW V,
VBWV, and VCWV registers are available to be read using the
I
2
C or SPI serial port. Setting Bit 17 (DREADY) in the MASK0
register enables an interrupt to be set when the DREADY flag is
set. See the Digital Signal Processor section for more details on
Bit DREADY.
As stated in the Current Waveform Gain Registers section, the
serial ports of the ADE78xx work on 32-, 16-, or 8-bit words.
Similar to registers presented in Figure 37, the VAWV, VBWV,
and VCWV 24-bit signed registers are transmitted sign
extended to 32 bits.
The ADE7854/ADE7858/ADE7868/ADE7878 each contain an
HSDC port especially designed to provide fast access to the
waveform sample registers. See the HSDC Interface section for
more details.
CHANGING PHASE VOLTAGE DATAPATH
The ADE7854/ADE7858/ADE7868/ADE7878 can direct one
phase voltage input to the computational datapath of another
phase. For example, Phase A voltage can be introduced in the
Phase B computational datapath, which means all powers
computed by the ADE78xx in Phase B are based on Phase A
voltage and Phase B current.
Bits[9:8] (VTOIA[1:0]) of the CONFIG register manage what
phase voltage is directed to Phase A computational data path. If
VTOIA[1:0] = 00 (default value), the Phase A voltage is directed
to the Phase A computational data path. If VTOIA[1:0] = 01,
the Phase B voltage is directed to the Phase A computational
data path. If VTOIA[1:0] = 10, the Phase C voltage is directed
to the Phase A computational data path. If VTOIA[1:0] = 11,
the
ADE7854/ADE7858/ADE7868/ADE7878 behaves as if
VTOIA[1:0] = 00.
Bits[11:10] (VTOIB[1:0]) of the CONFIG register manage
what phase voltage is directed to the Phase B computational
data path. If VTOIB[1:0] = 00 (default value), the Phase B
voltage is directed to the Phase B computational data path.
If VTOIB[1:0] = 01, the Phase C voltage is directed to the
Phase B computational data path. If VTOIB[1:0] = 10, the Phase A
voltage is directed to the Phase B computational data path. If
VTOIB[1:0] = 11, the ADE7854/ADE7858/ADE7868/ADE7878
behaves as if VTOIB[1:0] = 00.
Bits[13:12] (VTOIC[1:0]) of the CONFIG register manage what
phase voltage is directed to the Phase C computational data
path. If VTOIC[1:0] = 00 (default value), the Phase C voltage is
directed to Phase C computational data path, if VTOIC[1:0] =
01, the Phase A voltage is directed to the Phase C computational
data path. If VTOIC[1:0] = 10, the Phase B voltage is directed to
the Phase C computational data path. If VTOIC[1:0] = 11, the
ADE7854/ADE7858/ADE7868/ADE7878 behaves as if
VTOIC[1:0] = 00.