ADE7752 Analog Devices, ADE7752 Datasheet - Page 10

• Manufacturer Part Number: ADE7752
• Description: Three Phase Energy Metering IC with Pulse Output
• Manufacturer: Analog Devices

NO LOAD THRESHOLD
The ADE7752 also includes a “no load threshold” and
“start-up current” feature that will eliminate any creep
effects in the meter. The ADE7752 is designed to issue a
minimum output frequency. Any load generating a frequency
lower than this minimum frequency will not cause a pulse to
be issued on F1, F2 or CF. The minimum output frequency
is given as 0.0007% of the full-scale output frequency for
each of the F
example, an energy meter with a meter constant of 100 imp/
kWhr on F1, F2 using F
frequency at F1 or F2 would be 0.0007% of 4.77 Hz or 33.3
x 10
In this example the no load threshold would be equivalent to
1.2 W of load or a start-up current of 5.5 mA at 220 V.
REVERSE POWER INFORMATION
The ADE7752 detects when the current and voltage channels
of any of the three phase inputs have a phase difference
greater than 90° i.e. Φ
can detect wrong connection of the meter or generation of
Active Energy.
The REVP pin output will go active high when negative
power is detected on any of the three phase inputs. If positive
Active Energy is detected on all the three phases, REVP pin
output is Low. The REVP pin output changes state at the
same time as a pulse is issued on CF. If several phases
measure negative power, the REVP pin output will stay low
until all the phases measure positive power.
–6
Hz. This would be 533 x 10
1–5
frequency selections—see Table II. For
A
or Φ
2
(4.77 Hz), the minimum output
B
PRELIMINARY TECHNICAL DATA
0.0118 (0.30)
0.0040 (0.10)
or Φ
PIN 1
–6
C
Hz at CF (16 x F1 Hz).
24
> 90°. This mechanism
1
0.0500
(1.27)
BSC
0.6141 (15.60)
0.5985 (15.20)
Dimensions shown in inches and (mm).
0.0192 (0.49)
0.0138 (0.35)
24-SOIC Outline Package
OUTLINE DIMENSIONS
(AR-24)
0.1043 (2.65)
0.0926 (2.35)
SEATING
PLANE
–10–
13
12
0.2992 (7.60)
0.2914 (7.40)
N O T E
For a complete datasheet of the ADE7752, please contact us
on our website at:
http://forms.analog.com/Form_Pages/energymeter/
contact.asp
0.0125 (0.32)
0.0091 (0.23)
0.4193 (10.65)
0.3937 (10.00)
8
0
0.0291 (0.74)
0.0098 (0.25)
0.0500 (1.27)
0.0157 (0.40)
45
REV. PrB 08/01