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ADE7761 Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte ADE7761
Spiegazioni elettronici  Energy Metering IC with On-Chip Fault and Missing Neutral Detection
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADE7761
Rev. A | Page 10 of 28
Pin No.
Mnemonic
Description
13
INT
This pin is internally used and should be connected to DGND.
14
RCLKIN
To enable the internal oscillator as a clock source on the chip, a precise low temperature drift resistor at
nominal value of 6.2 kΩ must be connected from this pin to DGND.
15
FAULT
This logic output goes active high when a fault or missing neutral condition occurs. A fault is defined as
a condition under which the signals on V1A and V1B differ by more than 6.25%. A missing neutral
condition is defined when the chip is powered up with no voltage at the input. The logic output is reset
to zero when a fault or missing neutral condition is no longer detected. See the Fault Detection section
and the Missing Neutral Mode section.
16
REVP
This logic output goes logic high when negative power is detected, that is, when the phase angle
between the voltage and current signals is greater than 90°. This output is not latched and is reset when
positive power is once again detected. The output goes high or low at the same time as a pulse is issued
on CF.
17
DGND
This pin provides the ground reference for the digital circuitry in the ADE7761, that is, multiplier, filters,
and digital-to-frequency converter. This pin should be tied to the digital ground plane of the PCB. The
digital ground plane is the ground reference for all digital circuitry such as counters (mechanical and
digital), MCUs, and indicator LEDs. For good noise suppression, the analog ground plane should be
connected only to the digital ground plane at the DGND pin.
18
CF
Calibration Frequency Logic Output. The CF logic output, active high, gives instantaneous active power
information. This output is intended to be used for operational and calibration purposes. See the Digital-
to-Frequency Conversion section.
19, 20
F2, F1
Low Frequency Logic Outputs. F1 and F2 supply average active power information. The logic outputs
can be used to directly drive electromechanical counters and 2-phase stepper motors.


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