MAXQ3183-RAN+ datasheet(79/102 Pages) MAXIM

79 / 102 page

Low-Power, Multifunction, Polyphase AFE

with Harmonics and Tamper Detect

______________________________________________________________________________________

Number of Scan Frames per DSP Cycle (NS) (0x040)

The NS register defines the fundamental timing for the electricity meter. It defines a DSP cycle in terms the period of

the ADC scan frame. Generally, this register is calculated and updated automatically by the MAXQ3183 firmware

based on the zero-crossing detection, and whether noise rejection (REJ_NS) and averaging (AVG_NS) are enabled.

Host code can write to this register in order to set the desired DSP cycle duration. The duration of one scan frame

(tFR) is represented as 0x00010000.

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.

Bit:

Name:

Line Cycle Noise Rejection Filter High Byte

Reset:

0x00

Bit:

Name:

Line Cycle Noise Rejection Filter Low Byte

Reset:

0xC8

Bit:

Name:

Integer Portion, High Byte

Reset:

0x03

Bit:

Name:

Integer Portion, Low Byte

Reset:

0x28

Bit:

Name:

Fractional Portion, High Byte

Reset:

0x00

Bit:

Name:

Fractional Portion, Low Byte

Reset:

0x00

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