MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 77

• 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

This signed register contains the linearity offset for phase X current channel when the programmable gain amplifier
is set to unity gain (that is, the measured current is above the low current threshold). The signed value represented
by this register is added to the current value according to following formula:
This register contains the linearity coefficient 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 effective gain is given by the
equation:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Linearity Offset, High Range, Phase X = A/B/C (X.OFFS_HI) (A: 0x138, B: 0x224, C: 0x310)
Low-Power, Active Energy, Polyphase AFE
______________________________________________________________________________________
15
15
7
7
Linearity Gain Coefficient, Low Range, Phase X = A/B/C (X.GAIN_LO)
14
14
6
6
if LINFRM = 0:
if LINFRM = 1: X.IRMS + X.OFFS_HI x 2
13
13
5
5
Linearity Coefficient High Byte
Linearity Coefficient Low Byte
X IRMS
X GAIN LO
Linearity Offset High Byte
Linearity Offset Low Byte
.
.
2
12
12
4
4
14
2
_
+
0x00
0x00
0x40
0x00
X OFFS HI
.
11
11
3
3
_
×
2
(A: 0x13A, B: 0x226, C: 0x312)
4
24
10
10
2
2
Linearity Compensation
9
1
9
1
8
0
8
0
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