90E36 Datasheet, PDF (24/79 Pages) Integrated Device Technology – Poly-Phase High-Performance Wide-Span Energy Metering IC

90E36
POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
3.7.4 PARTIAL MEASUREMENT MODE (M MODE)
In this mode, Voltage ADCs, Neutral Line ADC and digital circuits are
inactive.
The 90E36 measures the current RMS of one line cycle.
When the measurement is done, the 90E36 asserts the IRQ0 pin
high until the Partial Measurement mode exits.
In this mode, the user needs to program the related registers (includ-
ing PGA gain, channel gain, offset, etc.) to make the current RMS mea-
surement accurate. Refer to 5.2 Partial Measurement mode Calibration.
Please note that not all registers in this mode is accessible. Only the
Partial Measurement related registers (14H~1DH) and some special
registers (00H, 01H, 03H, 07H,0EH, 0FH) can be accessed.
OSCI
OSCO
Power On Reset
Power Mode
Configuration
Current Detector
ADC-I1
ADC-I2
ADC-I3
ADC-IN
ADC-V1
ADC-V2
ADC-V3
Temperature Sensor
Reference Voltage
VDD18 Regulator
Crystal Oscillator
Energy Metering
(Forward/Reverse
Active/Reactive/CF
generator)
CF Out
Measure and Monitoring
Zero
DSP
(V/I/rms, SAG, Phase, Freq)
Crossing
Signal analyzer
ADC sample capture, THD
Warn
Out
IRQ
Control Logic
SPI Interface
DMA
Disabled
Figure-10 Block Diagram in Partial Measurement mode
Function Description
24
December 9, 2011