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EvaluationBoardDocumentation

AD7756EnergymeteringIC

EVAL-ADE7756EB

FEATURES

Evaluation Board is designed to be used together with

accompanying software to implement a fully functional

Energy Meter (Watt-Hour Meter).

Easy connection of various external transducers via

screw terminals.

Easy modification of signal conditioning components

using PCB sockets.

LED indicators on logic outputs CF, ZX, SAG and IRQ.

Optically isolated data output connection to PC parallel port.

Optically isolated frequency output (CF) to BNC.

External Reference option available for

on-chip reference evaluation.

PreliminaryTechnicalData

FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTION

The ADE7756 is a high accuracy electrical power mea-

surement IC with a serial interface and a pulse output.

The ADE7756 incorporates two second order sigma delta

ADCs, reference circuitry, temperature sensor and all the

signal processing required to perform active power and

energy measurement.

This documentation describes the ADE7756 evaluation kit

Hardware and Software functionality. The ADE7756

evaluation board, together with the ADE7756 data sheet

and this documentation provides a complete evaluation

platform for the ADE7756.

The evaluation board has been designed so that the

ADE7756 can be evaluated in the end application, i.e.,

Watt-Hour Meter. Using the appropriate transducers on

the current channel (e.g., shunt, CT etc.) the evaluation

board can be connected to a test bench or high voltage

(240V rms) test circuit. An on-board resistor divider

network provides the attenuation for the line voltage. This

application note also describes how the current transducers

should be connected for the best performance.

The evaluation board (watt-hour meter) is configured and

calibrated via the parallel port of a PC. The data interface

between the evaluation board and the PC is fully isolated.

Windows

TM

based software is provided with the evaluation

board which allows it to be quickly configured as an

energy meter.

The evaluation board also functions as a stand alone

evaluation system which can be easily incorporated into an

existing system via a 25 way D-Sub

connector.

The evaluation board requires two external 5V power

supplies (one is required for isolation purposes) and the

appropriate current transducer.

AD780

ADE7756

V+

AGND

V1P

V1N

V2N

V2P

+5V

PROTOTYPE

AREA

V-

AGND

Filter

Network

Filter

Network

&

Attenuation

74HC08

74HC08

DOUT

SCLK

DIN

CS

RESET

CF

ZX

SAG

IRQ

Connector to

PC Parallel

Port

BNC

BNC

External

Clock in

CF

Isolated Frequency

output

Optional External

2.5V Reference

PRELIMINARYTECHNICALDATA