Datasheet

90E32AS ENHANCED POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Function Description 21 April 2, 2013
3.7 POWER QUALITY MONITORING
Figure-9 Power Quality Monitor in Datapath
3.7.1 INSTANTANEOUS SIGNAL MONITORING
Peak detection function:
Peak value for each channel was detected within timing period con-
figured by the PeakDet_period bits (b15~8, SagPeakDetCfg).
The detected peak value is updated on period intersection.
Registers:
The peak value detected can be accessed through register U/I Peak
registers. Refer to 5.6.3 Peak, Frequency, Angle and Temperature Reg-
isters.
3.7.2 INSTANTANEOUS SIGNAL RELATED STATUS AND E
VENTS
The registers involved are OVth, OIth, SagTh, PhaseLossTh and
SagPeakDetCfg.
The result can be reflected in EMMState0 and EMMState1 registers,
as well as EMMIntState0 and EMMIntState1 registers if the correspond-
ing bits in EMMIntEn0/EMMIntEn1 registers are set.
The threshold value has the following relationship with the RMS reg-
ister (MSB-16bit):
Here VIgain is Ugain register value or Igain register value.
PGA
ADC
+
offset
Peak
Detector
Sag
Detector
PhaseLoss
Detector
OV
Detector
Phase
Angle
Phase Sequence,
Frequency
+
offset
OI
Detector
Peak
Detector
ZX
V-channel
I-channel
Phase -A
Phase -B
Phase -C
Frequency
Range
map
PGA
ADC
DSP
Freq
based
Comp
50/60
ZX
map
2
VIgain
2eRmsRegValu
= uexxThRegVal
14
∗