maxq3180-ran Maxim Integrated Products, Inc., maxq3180-ran Datasheet - Page 39

• Manufacturer Part Number: maxq3180-ran
• Description: Low-power, Multifunction, Polyphase Afe
• Manufacturer: Maxim Integrated Products, Inc.

The MAXQ3180 records peak current and voltage lev-
els for phase A, phase B, and phase C as follows. The
peak RMS values of the current and voltage within a
fixed number of accumulation cycles are stored in the
IPK and VPK registers for each phase. The values
stored in IPK and VPK represent only the 16 most sig-
nificant bits of the raw RMS registers, i.e., bits 31:16.
The PKCYC register specifies the number of accumula-
tion cycles. Figure 9 illustrates the timing behavior of
the peak current detection; peak voltage detection
works the same way.
Table 10. Pulse Output Quantity Selection (continued)
Figure 9. Peak Current-Detection Timing
ppppp OR qqqqq
Low-Power, Multifunction, Polyphase AFE
01010
01011
01100
01101
01110
01111
Other
Peak Voltage and Current Detection
CONTENT OF IPK[15:0]
______________________________________________________________________________________
IRMS_2
IRMS_1
... ...
SPECIFIED BY
ACC CYCLES
PKCYC[15:0]
REGISTER
IRMS_1
NO. OF
ACCUMULATED VALUE
Reserved
R1 + R3
R2 + R4
R1
R2
R3
R4
The MAXQ3180 detects overvoltage and overcurrent
events and can issue interrupt request signals to the
master when these events occur. The overvoltage level
can be programmed into the OVLVL register, while the
overcurrent level is determined by the OCLVL register.
Both OVLVL and OCLVL registers represent the 16
most significant bits of the VRMS or IRMS registers.
Any time the MAXQ3180 detects the RMS-value
exceeding a threshold level, the OV or OC interrupt flag
is set. If enabled, any of these flags issues an interrupt
request. All interrupt flags are “sticky” bits—the
IRMS_1
Overvoltage and Overcurrent Detection
IRMS_2
Reactive quadrant 1 energy
Reactive quadrant 2 energy
Reactive quadrant 3 energy
Reactive quadrant 4 energy
Absolute inductive energy
Absolute capacitive energy
—
CURRENT WAVEFORM
CURRENT RMS
IRMS_1
DESCRIPTION
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