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

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.