MAXQ3180 Maxim, MAXQ3180 Datasheet - Page 87

• 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 contains gain coefficient for phase X fundamental energy. The raw values are taken from the selected
measurement quantity and scaled by the following factor:
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:
Bit:
Name:
Reset:
Bit:
Name:
Reset:
Linearity Offset, High Range, Phase X = A/B/C (X.OFFS_HI) (A: 0x138, B: 0x224, C: 0x310)
Gain, Fundamental Energy, Phase X = A/B/C (X.EF_GAIN) (A: 0x136, B: 0x222, C: 0x30E)
Low-Power, Multifunction, Polyphase AFE
______________________________________________________________________________________
15
15
15
7
7
7
Linearity Gain Coefficient, Low Range, Phase X = A/B/C (X.GAIN_LO)
14
14
14
6
6
6
if LINFRM = 0:
if LINFRM = 1: X.IRMS + X.OFFS_HI x 2
13
13
13
5
5
5
Linearity Coefficient High Byte
Linearity Coefficient Low Byte
X IRMS
X GAIN LO
Gain Coefficient High Byte
X EF GAIN
Gain Coefficient Low Byte
Linearity Offset High Byte
Linearity Offset Low Byte
.
.
.
2
2
12
_
12
12
4
4
4
14
14
2
_
+
0x40
0x00
0x00
0x00
0x40
0x00
X OFFS HI
.
11
11
11
3
3
3
_
×
2
(A: 0x13A, B: 0x226, C: 0x312)
4
24
10
10
10
2
2
2
Linearity Compensation
9
1
9
1
9
1
8
0
8
0
8
0
87