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ADE7761BARS-REF Datasheet(PDF) 7 Page - Analog Devices |
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ADE7761BARS-REF Datasheet(HTML) 7 Page - Analog Devices |
7 / 24 page ADE7761B Rev. 0 | Page 7 of 24 Pin No. Mnemonic Description 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 0 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 that a pulse is issued on CF. 17 DGND Digital Ground. This pin provides the ground reference for the digital circuitry in the ADE7761B, that is, multiplier, filters, and digital-to-frequency converters. 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 to the digital ground plane only at the DGND pin. 18 CF Calibration Frequency Logic Output. The CF logic output, active high, gives instantaneous active power information. This output is 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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