MAXQ3183 Maxim, MAXQ3183 Datasheet - Page 79

• Manufacturer Part Number: MAXQ3183
• Description: The MAXQ3183 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, power, energy, and many other metering and power-quality parameters of a polyphase load
• Manufacturer: Maxim

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
(t
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:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
FR
) is represented as 0x00010000.
Low-Power, Multifunction, Polyphase AFE
______________________________________________________________________________________
31
23
15
15
7
7
with Harmonics and Tamper Detect
14
30
22
14
6
6
29
21
13
13
5
5
Line Cycle Noise Rejection Filter High Byte
Line Cycle Noise Rejection Filter Low Byte
Number of Scan Frames per DSP Cycle (NS) (0x040)
Line Cycle Noise Rejection Filter (REJ_NS) (0x02C)
Fractional Portion, High Byte
Fractional Portion, Low Byte
Integer Portion, High Byte
Integer Portion, Low Byte
12
28
20
12
4
4
0xC8
0x03
0x28
0x00
0x00
0x00
27
19
11
11
3
3
26
18
10
10
2
2
Filter Coefficients
25
17
9
1
9
1
24
16
8
0
8
0
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