MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 39

• 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

These bits indicate that an overflow condition has occurred on an energy accumulator. An overflow condition is not
an error condition. Rather, it simply indicates that the value in the energy accumulator could be smaller than the pre-
vious 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.
Bit:
Name:
Reset:
Bit:
Name:
Reset:
7:5, 3:2
BIT
7, 5
BIT
6
4
3
2
1
0
4
1
0
Energy Overflow Flags, Phase X = A/B/C (X.EOVER) (A: 0x146, B: 0x232, C: 0x31E)
DCHAM
NOZXM
NAME
DIR_A
NAME
Low-Power, Active Energy, Polyphase AFE
ANOV
APOV
OCM
UVM
OVM
SOV
—
—
______________________________________________________________________________________
—
—
7
0
7
0
Interrupt Mask, Phase X = A/B/C (X.MASK) (A: 0x145, B: 0x231, C: 0x31D)
Reserved.
Active Energy Direction Status
0 = positive
1 = negative
Real Energy Direction Change Mask. If set, a change in real power direction on phase X causes the
DCHA flag in the IRQ_FLAG register to be set.
No-Zero Crossing Mask. If set, a no-zero crossing on phase X causes the NOZX flag in the IRQ_FLAG
register to be set.
Undervoltage Mask. If set, an undervoltage condition on phase X causes the UV flag in the IRQ_FLAG
register to be set.
Overvoltage Mask. If set, an overvoltage condition on phase X causes the OV flag in the IRQ_FLAG
register to be set.
Overcurrent Mask. If set, an overcurrent condition on phase X causes the OC flag in the IRQ_FLAG
register to be set.
Reserved.
When set, indicates an overflow condition on the apparent energy accumulator.
When set, indicates an overflow condition on the real negative energy accumulator.
When set, indicates an overflow condition on the real positive energy accumulator.
DIR_A
—
6
0
6
0
—
—
5
0
5
0
DCHAM
SOV
4
0
4
0
FUNCTION
FUNCTION
NOZXM
—
3
0
0
3
UVM
—
2
0
2
0
ANOV
OVM
1
0
1
0
APOV
OCM
0
0
0
0
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