MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 46

• Manufacturer Part Number: MAXQ3181
• Description: The MAXQ3181 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, active power and energy, and many other metering parameters of a polyphase load
• Manufacturer: Maxim

Low-Power, Active Energy, Polyphase AFE
The virtual registers are calculated values derived from one or more real registers. They are calculated at the time
they are requested, and thus could involve additional time to return a value. Most virtual registers are 8 bytes in
length and are delivered least significant byte first.
This signed register contains the real instantaneous power delivered into phase A/B/C or total. Power is calculated
from the instantaneous energy measurement according to the following equation:
The register is 8 bytes long, but the most significant 2 bytes are not used. See the PWR_CC register description for
more details.
Note that the sign bit is bit 47 for all 8-byte signed virtual registers.
This register contains the apparent instantaneous power delivered into phase A/B/C or total. Power is calculated
from the instantaneous energy measurement according to the following equation:
The register is 8 bytes long, but the most significant 2 bytes are not used. See the PWR_CC register description for
more details.
46
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Apparent Power, Phase X = A/B/C/T (PWRS.X) (A: 0x821, B: 0x822, C: 0x824, T: 0x827)
Real Power, Phase X = A/B/C/T (PWRP.X) (A: 0x801, B: 0x802, C: 0x804, T: 0x807)
Byte 7 (MSByte unused)
Byte 7 (MSByte unused)
Byte 5
Byte 3
Byte 1
Byte 5
Byte 3
Byte 1
PWRP X
PWRS X
.
.
=
=
X ACT
X APP PWR CC
.
.
×
×
PWR CC
NS
NS
_
_
× 2
× 2
16
16
Byte 6 (unused)
Byte 0 (LSByte)
Byte 6 (unused)
Byte 0 (LSByte)
Byte 4
Byte 2
Byte 4
Byte 2
Virtual Registers
Power