MAXQ3181-RAN+ datasheet(71/84 Pages) MAXIM

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Low-Power, Active Energy, Polyphase AFE

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Filter Coefficients

Line Cycle Noise Rejection Filter (REJ_NS) (0x02C)

This register establishes the sensitivity of the NS rejection filter setting. NS is a measure of the line frequency. If a line

cycle occurs that is shorter or longer than the line cycle represented in the NS register, this filter determines whether

the cycle is used to update the NS value. For more information, see the NS register description. If this register is

zero, noise rejection is disabled for the line cycle counter.

Line Cycle Averaging Filter (AVG_NS) (0x02E)

This register determines whether the NS value is averaged over previous values or whether the most recently measured

value is used directly. If the value of this register is nonzero, the NS value is averaged using the following formula:

If the value of this register is zero, NS is not averaged. The MSB of this register must be zero.

AVG NS

−

Bit:

Name:

Line Cycle Noise Rejection Filter High Byte

Reset:

0x00

Bit:

Name:

Line Cycle Noise Rejection Filter Low Byte

Reset:

0xC8

Bit:

Name:

Line Cycle Averaging Filter High Byte

Reset:

0x40

Bit:

Name:

Line Cycle Averaging Filter Low Byte

Reset:

0x00

MAXQ3181-RAN+ Datasheet(PDF) 71 Page - Maxim Integrated Products