MAXQ3180 Maxim, MAXQ3180 Datasheet - Page 89

• 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

These bits indicate an overflow condition has occurred on a fundamental frequency energy accumulator. An over-
flow condition is not an error condition. Rather, it simply indicates that the value in the energy accumulator could be
smaller than the previous reading due to the overflow in the counter. To obtain the actual energy usage since the
previous reading, 0x100000000 must be added to the difference. These bits, once set, can be cleared only by the
host.
On every DSP cycle, the contents of the X.ACTF register are tested, and if positive, are added to this register. When
this register overflows, the APFOV bit in the X.EFOVER register is set.
Bit:
Name:
Reset:
Bit:
Name:
Bit:
Name:
Bit:
Name:
Bit:
Name:
BIT
7:5
4
3
2
1
0
RNFOV
ANFOV
RPFOV
APFOV
NAME
SFOV
Low-Power, Multifunction, Polyphase AFE
—
______________________________________________________________________________________
31
23
15
—
7
7
0
Reserved.
When set, indicates an overflow condition on the apparent fundamental-mode energy accumulator.
When set, indicates an overflow condition on the reactive negative fundamental-mode energy accumulator.
When set, indicates an overflow condition on the reactive positive fundamental-mode energy accumulator.
When set, indicates an overflow condition on the real negative fundamental-mode energy accumulator.
When set, indicates an overflow condition on the real positive fundamental-mode energy accumulator.
30
22
14
—
Fundamental Energy Overflow Flags, Phase X = A/B/C (X.EFOVER)
6
6
0
Energy, Fundamental, Real Positive, Phase X = A/B/C (X.EAFPOS)
29
21
13
—
5
5
0
SFOV
Real Energy Byte 3
Real Energy Byte 2
Real Energy Byte 1
Real Energy Byte 0
28
20
12
4
0
4
FUNCTION
RNFOV
27
19
11
3
3
0
(A: 0x1FC, B: 0x2E8, C: 0x3D4)
(A: 0x147, B: 0x233, C: 0x31F)
RPFOV
26
18
10
2
0
2
Fundamental Energy
ANFOV
25
17
1
0
9
1
APFOV
24
16
0
8
0
0
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