MAXQ3181-RAN+ datasheet(43/84 Pages) MAXIM

43 / 84 page

Low-Power, Active Energy, Polyphase AFE

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Virtual Register Conversion Coefficients

Voltage Units Conversion Coefficient (VOLT_CC) (0x014)

This register contains the value by which the raw voltage value in each phase (A.VRMS, B.VRMS, and C.VRMS) is

multiplied before being presented to the virtual RMS voltage registers (V.A, V.B, and V.C).

To determine the value of VOLT_CC, a voltage value for the least significant bit (VOLT_LSB) of the V.X registers

must be selected. Typical values might range from 1mV to 1nV. To avoid significant conversion loss, VOLT_LSB

should be chosen such that VOLT_CC is >1000. Once VOLT_LSB is determined, calculate VOLT_CC from the fol-

lowing equation:

Current Units Conversion Coefficient (AMP_CC) (0x016)

This register contains the value by which the raw current value in each phase (A.IRMS, B.IRMS, C.IRMS, and

N.IRMS) is multiplied before being presented to the virtual RMS current registers (I.A, I.B, I.C, and I.N). To determine

the value of AMP_CC, a current value for the least significant bit (AMP_LSB) of the I.X registers must be selected.

Typical values might range from 1nA to 10μA. To avoid significant conversion loss, AMP_LSB should be chosen

such that AMP_CC is >1000. Once determined, calculate AMP_CC from the following equation:

AMP CC

AMP LSB

2 24

VOLT CC

VOLT LSB

2 24

Bit:

Name:

Voltage Units Conversion Coefficient High Byte

Reset:

0x00

Bit:

Name:

Voltage Units Conversion Coefficient Low Byte

Reset:

0x01

Bit:

Name:

Current Units Conversion Coefficient High Byte

Reset:

0x00

Bit:

Name:

Current Units Conversion Coefficient Low Byte

Reset

0x01

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