MAXQ3180-RAN+ datasheet(39/48 Pages) MAXIM

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Peak Voltage and Current Detection

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.

Overvoltage and Overcurrent Detection

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

Low-Power, Multifunction, Polyphase AFE

______________________________________________________________________________________

Table 10. Pulse Output Quantity Selection (continued)

ppppp OR qqqqq

ACCUMULATED VALUE

DESCRIPTION

01010

Reactive quadrant 1 energy

01011

Reactive quadrant 2 energy

01100

Reactive quadrant 3 energy

01101

Reactive quadrant 4 energy

01110

R1 + R3

Absolute inductive energy

01111

R2 + R4

Absolute capacitive energy

Other

Reserved

—

IRMS_1

IRMS_2

CONTENT OF IPK[15:0]

... ...

IRMS_1

IRMS_2

CURRENT WAVEFORM

CURRENT RMS

NO. OF

ACC CYCLES

SPECIFIED BY

PKCYC[15:0]

Figure 9. Peak Current-Detection Timing

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