MAXQ3183-RAN+ datasheet(63/102 Pages) MAXIM

63 / 102 page

Low-Power, Multifunction, Polyphase AFE

with Harmonics and Tamper Detect

______________________________________________________________________________________

VFS is full-scale voltage. This is the input voltage that

produces full-scale ADC output; defined by the hard-

ware voltage transducer ratio VTR and ADC full-scale

input voltage VFSADC:

VFS = VFSADC x VTR

Default conditions are VFSADC = 1.024V. VTR is design

dependent.

IFS is full-scale current. This is the input current that

produces full-scale ADC output; defined by the hard-

ware current transducer ratio ITR and ADC full-scale

input voltage VFSADC:

IFS = VFSADC x ITR

Default conditions are VFSADC = 1.024V. ITR is design

dependent.

Meter units are defined with respect to the base para-

meters as shown in Table 5.

When reading virtual registers, the MAXQ3183 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, PWRQ.X, PWRS.X, PWRPF.X,

PWRQF.X, PWRSF.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, ENRQ.X, ENRS.X, ENRPF.X,

ENRQF.X, ENRSF.X

ENR_LSB

ENR_CC = MU_ENR/ENR_LSB

METER UNIT (1 LSB)

Current RMS: X.IRMS

Pulse output current RMS

THR1 or THR2, when pulse output configured to IRMS

MU_AMP = IFS/224

Voltage RMS: X.VRMS

Pulse output RMS voltage

THR1, or THR2 when pulse output configured to VRMS

MU_VOLT = VFS/224

Energy: X.ACT, X.REA, X.APP, X.EAPOS, X.EANEG, X.ERPOS,

X.ERNEG, X.ES

Fundamental Energy: X.ACTF, X.REAF, X.APPF, X.EAFPOS,

X.EAFNEG, X.ERFPOS, X.ERFNEG, X.ESF

Pulse Output Energy: THR1 or THR2

MU_ENR = VFS x IFS x tFR/216

Power: PWRP.X, PWRQ.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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