Datasheet

90E36A POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Function Description 24 April 2, 2013
3.7.4 PARTIAL MEASUREMENT MODE (M MODE)
In this mode, Voltage ADCs, Neutral Line ADC and digital circuits are
inactive.
The 90E36A measures the current RMS of one line cycle.
When the measurement is done, the 90E36A 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.
Figure-10 Block Diagram in Partial Measurement mode
VDD18 Regulator
Temperature Sensor
Current Detector
ADC-V1
ADC-V2
ADC-V3
ADC-I1
ADC-I2
ADC-I3
ADC-IN
SPI Interface
DSP
Energy Metering
(Forward/Reverse
Active/Reactive/CF
generator)
Measure and Monitoring
(V/I/rms, SAG, Phase, Freq)
Signal analyzer
ADC sample capture, THD
Control Logic
Zero
Crossing
CF Out
Power On Reset
Crystal Oscillator
DMA
Reference Voltage
OSCI OSCO
Power Mode
Configuration
Disabled
IRQ
Warn
Out