90E32 Datasheet, PDF (24/71 Pages) Integrated Device Technology – Poly-Phase High-Performance Wide-Span Energy Metering IC

90E32
POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
3.6.5 TRANSITION OF POWER MODES
The above power modes are controlled by the PM0 and PM1 pins. In
application, the PM0 and PM1 pins are connected to external MCU. The
PM0 and PM1 pins have internal RC- filters.
Generally, the 90E32 stays in Idle mode most of the time while out-
age. It enters Detection mode at a certain interval (for example 5s) as
controlled by the MCU. It informs the MCU if the current exceeds the
configured threshold. The MCU then commands the 90E32 to enter Par-
tial Measurement mode at a certain interval (e.g. 60s) to read related
current. After current reading, the 90E32 gets back to the Idle mode.
The measured current may be used to count energy according to
some metering model (like current RMS multiplying the rated voltage to
compute the power).
Any power mode transition goes through the Idle mode, as shown in
Figure-10.
Normal Mode
Idle Mode
Detection Mode
Partial
Measurement Mode
Figure-10 Power Mode Transition
Function Description
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December 9, 2011