MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 38

• 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
The X.FLAGS register contains condition flags that relate to the function of phase X (A/B/C) measurements. Once
set, these bits can be cleared only by the host.
38
Bit:
Name:
Reset:
BIT
7:5
______________________________________________________________________________________
4
3
2
1
0
DCHAF
NOZXF
NAME
OCF
OVF
UVF
—
—
7
0
Interrupt Flags, Phase X = A/B/C (X.FLAGS) (A: 0x144, B: 0x230, C: 0x31C)
Reserved.
Real Energy Direction Change. Set when the direction of real power flow changes (from toward the load
to toward the line, or from toward the line to toward the load). If the DCHAM bit is set, this bit sets the
DCHA flag in the IRQ_FLAG register.
No-Zero Crossing. Set when the voltage waveform in phase X fails to exhibit a zero crossing during
NZX_TIMO of the ADC sample periods. If the NOZXM bit is set, this bit sets the NOZX flag in the
IRQ_FLAG register.
Undervoltage. Set when the RMS voltage in phase X falls below the undervoltage threshold set in
UVLVL. If the UVM bit is set, this bit sets the UV flag in the IRQ_FLAG register.
Overvoltage. Set when the RMS voltage in phase X exceeds the overvoltage threshold set in OVLVL. If
the OVM bit is set, this bit sets the OV flag in the IRQ_FLAG register.
Overcurrent. Set when the RMS current in phase X exceeds the overcurrent threshold set in OCLVL. If
the OCM bit is set, this bit sets the OC flag in the IRQ_FLAG register.
—
6
0
—
5
0
DCHAF
4
0
FUNCTION
NOZXF
3
0
Phase Status Registers
UVF
2
0
OVF
1
0
OCF
0
0