MAXQ3180 Maxim, MAXQ3180 Datasheet - Page 79

• Manufacturer Part Number: MAXQ3180
• Description: The MAXQ3180 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

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.
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.
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Low-Power, Multifunction, Polyphase AFE
______________________________________________________________________________________
15
15
7
7
14
14
6
6
y
n
13
13
5
5
Line Cycle Noise Rejection Filter High Byte
Line Cycle Noise Rejection Filter Low Byte
=
Line Cycle Averaging Filter High Byte
y
Line Cycle Averaging Filter Low Byte
n
−
Line Cycle Noise Rejection Filter (REJ_NS) (0x02C)
1
+
AVG NS
12
12
Line Cycle Averaging Filter (AVG_NS) (0x02E)
4
4
_
0xC8
0x00
0x40
0x00
x
n
2
−
16
y
11
11
3
3
n
−
1
10
10
2
2
Filter Coefficients
9
1
9
1
8
0
8
0
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