EVAL-ADE7878EBZ Analog Devices Inc, EVAL-ADE7878EBZ Datasheet - Page 12

• 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

EVAL-ADE7878EB
Power Quality
Power Quality panel is divided in two horizontal halfs. The
bottom one shows various registers that manage various power
quality measurements function of Active Measurement button.
The one above shows ADE7878 status and various buttons that
manage the measurements. When “Read Configuration” button
is pressed, all power quality registers (MASK1[31:0],
STATUS1[31:0], PERIOD[15:0], MMODE[7:0], ISUM[27:0],
OVLVL[23:0], OILVL[23:0], PHSTATUS[15:0], IPEAK[31:0],
VPEAK[31:0], SAGLVL[23:0], SAGCYC[7:0], ANGLE0[15:0],
ANGLE1[15:0], ANGLE2[15:0], COMPMODE[15:0],
CHECKSUM[31:0], PEAKCYC[7:0]) are read and the ones
belonging to the active window are visualized. Based on
PERIOD[15:0] register, the line frequency is computed and
visualized in the Zero Crossing Measurement window. Based on
Figure 18. Mean Absolute Value Current panel
Figure 19. Voltage RMS panel
Rev. PrB | Page 12 of 30
ANGLEx[15:0] (x=0,1,2) registers, cos(ANGLEx) are computed
and visualized.
When “Write Configuration” button is pressed, MMODE[7:0],
OVLVL[23:0], OILVL[23:0], SAGLVL[23:0], SAGCYC[7:0],
COMPMODE[15:0], PEAKCYC[7:0] are written into
ADE7878 and then CHECKSUM[31:0] is read back and
visualized.
When “Wait For Interrupts” button is pressed, the interrupts
enabled by the user in MASK1[31:0] register are monitored.
When
its bits visualized. Then, ISUM[27:0], PHSTATUS[15:0],
IPEAK[31:0], VPEAK[31:0], ANGLE0[15:0], ANGLE1[15:0],
ANGLE2[15:0] registers are also read and visualized. A timeout
should be introduced in 3 seconds increments to ensure the
program does not wait indefinitely for interrupts and a timer
(in 10msec increments) is provided to allow reading the
registers with a delay from the moment the inyterrupt is
triggered.
“Active Measurement” button gives access to Zero Crossing
measurements, Neutral Current Mismatch management,
Overvoltage & Overcurrent management, Peak detection, Sag
detection and Time Intervals Between Phases (see Figure 20,
Figure 21, Figure 22, Figure 23, Figure 24).
The line frequency is computed using PERIOD[15:0] register
based on the following formula:
Based on ANGLE0[15:0], ANGLE1[15:0], ANGLE2[15:0]
measurements, the cosine of them is computed using the
following formula:
cos(
ANGLEx
IRQ pin goes low, STATUS1[31:0] register is read and
f =
1
Figure 20. Zero Crossing Measurements panel
PERIOD
)
256000
=
cos
Preliminary Technical Data
⎛
⎜
⎝
ANGLEx
[
Hz
]
256000
⋅
360
⋅
50
⎞
⎟
⎠