MAXQ3181-RAN+ datasheet(57/84 Pages) MAXIM

57 / 84 page

Low-Power, Active Energy, Polyphase AFE

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When reading virtual registers, the MAXQ3181 uses the

configurable conversion coefficients AMP_CC,

VOLT_CC, PWR_CC, and ENR_CC to return meaningful

data. Table 6 describes how to set the coefficients.

Table 6. Virtual Register Coefficients

VIRTUAL REGISTER

OUTPUT RESOLUTION

(1 LSB), DEFINED BY USER

COEFFICIENT

Power:

PWRP.X, PWRS.X

PWR_LSB

PWR_CC = MU_PWR/PWR_LSB

Voltage:

V.X

VOLT_LSB

VOLT_CC = MU_VOLT/VOLT_LSB

Current:

I.X

AMP_LSB

AMP_CC = MU_AMP/AMP_LSB

Energy:

ENRP.X, ENRS.X

ENR_LSB

ENR_CC = MU_ENR/ENR_LSB

METER UNIT (1 LSB)

Current RMS: X.IRMS

Pulse output current RMS

THR1, when pulse output configured to IRMS

MU_AMP = IFS/224

Voltage RMS: X.VRMS

Pulse output RMS voltage

THR1, when pulse output configured to VRMS

MU_VOLT = VFS/224

Energy: X.ACT, X.APP, X.EAPOS, X.EANEG, X.ES

Pulse Output Energy: THR1

MU_ENR = VFS x IFS x tFR/216

Power: PWRP.X, PWRS.X

MU_PWR = VFS x IFS/232

When X.ESF Contains Amp-Hours: X.ESF

MU_AH = IFS x tFR/216

OCLVL, NOLOAD, I1THR, I2THR

IFS/216

OVLVL, UVLVL

VFS/216

Table 5. Meter Unit Definitions

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