MAXQ3183-RAN+ datasheet(77/102 Pages) MAXIM

77 / 102 page

Low-Power, Multifunction, Polyphase AFE

with Harmonics and Tamper Detect

______________________________________________________________________________________

Neutral Current and Harmonics

Auxiliary Channel Configuration (AUX_CFG) (0x010)

The MAXQ3183 can monitor the RMS value of one auxiliary channel in addition to its normal processing. The

Auxiliary Channel Configuration register selects which input the auxiliary channel processes and what processing is

applied to the auxiliary channel.

Bit:

Name:

—

ORDH

Reset:

Bit:

Name:

ENHARM

ENAUX

INREV

—

AUX_MUX

Reset:

BIT

NAME

FUNCTION

15:13, 4

—

Reserved.

12:8

ORDH

Order of Harmonic (1–21). The output of harmonic voltage is read via virtual register 0x830 and current

at 0x840.

ENHARM

Enable Auxiliary Channel Harmonic Filter. When set, the auxiliary channel is processed through the

harmonic filter. The parameters for this filter can be set in the B0HARM and A1HARM registers.

ENAUX

Enable Auxiliary Channel. When set, enables auxiliary channel processing.

INREV

Sets the sign of the neutral current, used in the vector sum calculation.

0 = positive, i.e., IN is directly summed with IA + IB + IC.

1 = negative, -IN is summed with IA + IB + IC.

3:0

AUX_MUX

Auxiliary Channel Input or Current Vector Sum Select. The lower three bits select the input to be

processed by the auxiliary channel if the MSB (bit 3) is cleared. When MSB is set, this field selects

vector sum computation:

1001 = IA + IB +IC

1111 = IA + IB + IC + IN (INREV = 0) or IA + IB + IC - IN (INREV = -1)

0001 = IN

0010 = VA

0011 = IA

0100 = VB

0101 = IB

0110 = VC

0111 = IC

All other values are reserved.

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