UG-572 Datasheet, PDF (14/20 Pages) Winchester Electronics Corporation – C JACK

UG-572
CFx CONFIGURATION
The CFx Configuration window is shown in Figure 21. This
window is used to set up the CF outputs to give out pulses.
• COMPMODE and CFMODE register indicators are at the
top of the window. CFCYC is the number of CF pulses
between two consecutive energy latches.
• The three smaller TERMSELx windows on the left
have selections for which phases to include in the CF
calculations. Hold the Shift key down to select multiple
phases.
• To the right are three CFxSEL windows that configure the
type of power output on each CF pin.
• The right side has CFx output switches for enabling the CF
outputs and switches for enabling CFx Latch Mode.
• The CFxDEN values are used to change the frequency of
the output by a certain multiple (for example, dividing
CFxDEN by 2 divides the frequency by 2).
EVAL-ADE7978EBZ User Guide
• Read all energy registers using line accumulation mode
reads the energy registers that are set in line cycle
accumulation mode. LINECYC is the number of half-line
cycles after which to take the register reading.
• Under this button is a progress bar and Expected
Accumulation Time box with the predicting time it takes
to obtain a reading. The Actual Accumulation Time box
gives the amount of time it took for the readings to run
with the selected amount of line cycles (LINECYC).
• The bottom of the window displays the output of all the
energy registers for the chosen phase in the drop-down
box, Choose Phase. The selection can be changed while
the Read all energy registers using line accumulation
mode and Read energy registers synchronous with CFx
pulses buttons are pressed.
• The switches under these drop-down boxes are used to
choose the energies to be read in line cycle accumulation
mode.
• The timeout boxes are used to set the amount of time in
milliseconds the part waits for a zero crossing and to set
the amount of time elapsed before resetting an interrupt.
• Exit returns to the main menu.
• Read reads the current setup of the part and the energy
register values.
• Write writes the current configuration to the registers.
Figure 21. CFx Configuration Window
READ ENERGY REGISTERS
The Read Energy Registers window is shown in Figure 22. This
window provides settings to read the energy registers in line
cycle accumulation or in synchronous with CF pulses.
At the top center are the Read energy registers synchronous
with CFx pulses buttons. When pressed, the energy registers
that contribute to the CFx pin output are read when the CFx pin
transitions high to low and an interrupt is triggered.
Note this function requires setting Bits[14:12] (CF3LATCH,
CF2LATCH, and CF1LATCH) in the CFMODE register using
the CFx Configuration window. See the CFx Configuration
section for details. If these bits are not set and the Read energy
registers synchronous with CFx pulses buttons are pressed,
a message displays and the CF3LATCH, CF2LATCH, and
CF1LATCH bits are set. When the buttons are depressed, the
bits are cleared back to 0.
Figure 22. Read Energy Registers Window
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