MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 57

• 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

When reading virtual registers, the MAXQ3181 uses the
configurable conversion coefficients AMP_CC,
Table 5. Meter Unit Definitions
Table 6. Virtual Register Coefficients
Current RMS: X.IRMS
Pulse output current RMS
THR1, when pulse output configured to IRMS
Voltage RMS: X.VRMS
Pulse output RMS voltage
THR1, when pulse output configured to VRMS
Energy: X.ACT, X.APP, X.EAPOS, X.EANEG, X.ES
Pulse Output Energy: THR1
Power: PWRP.X, PWRS.X
When X.ESF Contains Amp-Hours: X.ESF
OCLVL, NOLOAD, I1THR, I2THR
OVLVL, UVLVL
Power:
PWRP.X, PWRS.X
Voltage:
V.X
Current:
I.X
Energy:
ENRP.X, ENRS.X
VIRTUAL REGISTER
Low-Power, Active Energy, Polyphase AFE
REGISTER OR ACCUMULATOR
______________________________________________________________________________________
(1 LSB), DEFINED BY USER
OUTPUT RESOLUTION
VOLT_LSB
PWR_LSB
AMP_LSB
ENR_LSB
MU_AMP = I
MU_VOLT = V
MU_ENR = V
MU_PWR = V
MU_AH = I
I
V
FS
FS
VOLT_CC, PWR_CC, and ENR_CC to return meaningful
data. Table 6 describes how to set the coefficients.
/2
/2
16
16
FS
FS
FS
FS
x t
FS
/2
x I
FR
x I
/2
24
24
FS
/2
FS
16
/2
x t
METER UNIT (1 LSB)
32
FR
/2
VOLT_CC = MU_VOLT/VOLT_LSB
PWR_CC = MU_PWR/PWR_LSB
AMP_CC = MU_AMP/AMP_LSB
16
ENR_CC = MU_ENR/ENR_LSB
COEFFICIENT
57