MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 78

• Manufacturer Part Number: MAXQ3181
• Description: The MAXQ3181 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, active power and energy, and many other metering parameters of a polyphase load
• Manufacturer: Maxim

Low-Power, Active Energy, Polyphase AFE
This signed register contains the linearity offset for phase X current channel when the programmable gain amplifier
is set to gain of 32 (that is, the measured current is below the low current threshold). The signed value represented
by this register is added to the current value. The total linearity compensation is applied as follows:
This register contains the result of the RMS calculation on the AUX channel. Usually, this is the neutral current
channel.
78
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Linearity Offset, Low Range, Phase X = A/B/C (X.OFFS_LO) (A: 0x13C, B: 0x228, C: 0x314)
______________________________________________________________________________________
15
31
23
15
7
7
if LINFRM = 0: X.GAIN_LO/2
if LINFRM = 1: X.GAIN_LO/2
14
30
22
14
6
6
13
29
21
13
5
5
Linearity Offset High Byte
Linearity Offset Low Byte
14
RMS Result, Byte 3
RMS Result, Byte 2
RMS Result, Byte 1
RMS Result, Byte 0
x
12
28
20
12
4
4
14
X IRMS
x (X.IRMS + X.OFFS_LO)
.
0x00
0x00
On-Demand RMS Result (N.IRMS) (0x11C)
Measurements—RAM Registers
2
+
11
27
19
11
3
3
X OFFS LO
.
_
10
26
18
10
2
2
×
2
16
25
17
9
1
9
1
24
16
8
0
8
0