EVAL-ADE7878EBZ Analog Devices Inc, EVAL-ADE7878EBZ Datasheet - Page 9

• Manufacturer Part Number: EVAL-ADE7878EBZ
• Description: Energy Meter Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADE7878EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Energy Meter
• Kit Application Type: Data Converter
• Silicon Core Number: ADE7878
• Features: External Transducers, LED Indicators, Logic Outputs
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4472972; Q4684026; Q5015773

Preliminary Technical Data
Total Active Power
When “Total Active Power” is selected, the panel presented in
Figure 10 is opened. The screen has two horizontal halfs: the
one below shows the total active power data path of one phase
and the one above shows bits, registers and commands
necessary to the power management. The Active Data Path
button manages which data path is shown in the bottom half.
Some registers or bits, like WTHR0[31:0] or bit 0 (INTEN) of
CONFIG[15:0] are common to all data paths, independent of
which phase is shown. In that case, when they are updated, all
the values in all data paths are updated. HPFDIS[23:0] register
is present twice in the data path. In this case, only its value from
the current data path is written into ADE7878. All the other
instances take this value directly.
power and visualizes them. Registers from the inactive data
paths are also read and updated.
“Write” button writes all registers that manage the total active
power into ADE7878. Registers from the inactive data paths are
also written.
ADE7878 status window shows the power mode in which
ADE7878 is into (it should always be PSM0 in this window), the
active serial port (it should always be SPI) and
CHECKSUM[31:0] register. After every READ and WRITE
operation, CHECKSUM[31:0] register is read and visualized.
When “CFx Configuration” button is pressed, a new panel is
opened (see Figure 11). This panel gives access to all bits and
registers that configure the CF1, CF2 and CF3 outputs of
ADE7878. Read and Write buttons update and visualize their
values. Similar to Total Active Power panel, CHECKSUM[31:0]
register is read back whenever a read or write operation is
executed. To select more than one choice in TERMSELx, x=1, 2,
3 bits of COMPMODE[15:0] register, just press CTRL keypad
when clicking on them. EXIT button closes the panel returns to
Total Active Power panel.
“Read” button reads all registers that manage the total active
Figure 9. Configure Communication panel
Rev. PrB | Page 9 of 30
When “Read Energy Registers” button is pressed, a new panel is
opened (see Figure 12). This panel gives access to bits and
registers that configure the energy accumulation. Read Setup
and Write Setup buttons update and visualize their values.
Similar to Total Active Power panel, CHECKSUM[31:0] register
is read back whenever a read or write operation is executed.
“Read All Energy” registers button reads all energy registers in
that instant, whithout regard to the mode in which they function.
The panel also gives the choice of reading the energy registers
synchronous to CFx, x=1, 2, 3 interrupts or using line cycle
accumulation mode. When “Read energy registers
synchronously with CF1 pulses” button is pressed, the following
happens:
- STATUS0[31:0] is read and then written back, so all non zero
interrupt flag bits are cancelled.
- bit 14 (CF1) in MASK1[31:0] register is set to 1 and the
interrupt protocol is started (please see Communication
Protocol Between Microcontroller and ADE7878 chapter for
protocol details). The microcontroller waits until
goes low. If the wait is longer than the timeout the user indicates
in 3sec increments, then an error message is displayed: “No CF1
pulse was generated. Verify all the settings before attempting to
read energy registers in this mode!” When
STATUS0[31:0] register is read and written back to cancel bit 14
(CF1) and then the energy registers involved in CF1 signal are
read and visualized. A timer in 10msec increments can be used
to measure the reaction time after
- The operation is repeated as long as the button remains
pressed.
The process is similar when the other CF2, CF3 and line
accumulation buttons are pressed.
It is recommended to always use a timeout when dealing with
interrupts. By default, the timeout is set to 10 (indicating 30 sec
timeout) and the timer is set to 0 (indicating the
STATUSx[31:0], x=1, 2 and energy registers are read
immediately after
When selected, “Total Reactive Power”, “Fundamental Active
Power” and “Fundamental Reactive Power” buttons open panels
very similar with the Total Active Power panel. They are
presented in Figure 13, Figure 14 and Figure 15.
IRQ goes low).
0
IRQ pin goes low.
EVAL-ADE7878EB
0
IRQ pin goes low,
0
IRQ pin
0