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ADE7754
Watt Mode Register (0Dh)
The phases involved in the active energy measurement of the ADE7754 are defined by writing to the WATMODE register. Table XIV
summarizes the functionality of each bit in the WATMODE register.
Table XIV. WATMODE Register
Bit
Bit
Default
Location
0-2
Mnemonic
LWATSEL
Value
7
Description
These bits are used to select each part of the formula separately, depending on the line active
energy measurement method. The behavior of these bits is the same as WATSEL bits. Bit 2
selects the first term of the formula and so on.
3-5
WATSEL
7
These bits are used to select each part of the formula separately, depending on the active
energy measurement method. These bits are also used to enable the negative power detection
available in Bits 12 to 14 of CFNUM register. See Table XI. Setting Bit 5 to Logic 1 selects
the first term of the formula (VA
IA or VA
(IA – IB)). Setting Bit 4 to Logic 1 selects the
second term of the formula (VB
IB or 0 depending on WATMOD configuration). Setting
Bit 3 to Logic 1 selects the last term of the formula (VC
IC or VC
(IC – IB)). Any combi-
nation of these bits can address calibration and operational needs.
6-7
WATM
0
These bits are used to select the formula used for active energy calculation.
WATM1
WAVM0
Active Energy Calculation
0
0
VA
IA + VB
IB + VC
IC
0
1
1
0
VA
VA
(IA – IB) + 0 + VC
(IA – IB) + 0 + VC
(IC – IB)
IC
1
1
Reserved.
VA Mode Register (0Eh)
The phases involved in the apparent energy measurement of the ADE7754 are defined by writing to the VAMODE register. Table XV
summarizes the functionality of each bit in the VAMODE register.
Table XV. VAMODE Register
Bit
Bit
Default
Location
0-2
Mnemonic
LVASEL
Value
7
Description
These bits are used to select each part of the formula separately, depending on the line appar-
ent energy measurement method. The behavior of these bits is the same as VASEL bits. Bit 2
selects the first term of the formula, and so on.
3-5
VASEL
7
These bits are used to select separately each part of the formula, depending on the apparent
energy measurement method. Setting Bit 5 to Logic 1 selects the first term of the formula
(VA rms
IA rms ). Setting Bit 4 to Logic 1 selects the second term of the formula (VB rms
IB rms
or (VA rms +VC rms )/2
IB rms or VA rms
IB rms depending on VAMOD configuration). Setting
Bit 3 to Logic 1 selects the first term of the formula (VC rms
bits can address calibration and operational needs.
IC rms ). Any combination of these
6-7
VAMOD
0
These bits are used to select the formula used for active energy calculation.
VAMOD1
VAMOD0
Apparent Energy Calculation
0
0
VA rms
IA rms + VB rms
IB rms + VC rms
IC rms
0
1
VA rms
IA rms + (VA rms + VC rms )/2
IB rms + VC rms
IC rms
1
0
VA rms
IA rms + VA rms
IB rms + VC rms
IC rms
1
1
Reserved.
–38 –
REV. 0
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