MAXQ3181-RAN+ datasheet(70/84 Pages) MAXIM

70 / 84 page

Low-Power, Active Energy, Polyphase AFE

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Cycle Count (CYCNT) (0x01C)

This register contains the number of line cycles that will be accumulated in a single DSP cycle. When CYCNT line

cycles have been accumulated, the DSP performs power, power factor, and energy calculations. By default, the

cycle count is 0x10 (16 decimal).

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 MAXQ3181 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.

Bit:

Name:

Cycle Count High Byte

Reset:

0x00

Bit:

Name:

Cycle Count Low Byte

Reset:

0x10

Bit:

Name:

Integer Portion, High Byte

Reset:

0x03

Bit:

Name:

Integer Portion, Low Byte

Reset:

0xE8

Bit:

Name:

Fractional Portion, High Byte

Reset:

0x00

Bit:

Name:

Fractional Portion, Low Byte

Reset:

0x00

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