AS8168 datasheet(1/30 Pages) AMSCO

Part #	AS8168

Description	Single Phase Average Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output

PDF	30 Pages

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Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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Revision 1.2, 11-Feb-05

Page 1 of 30

Features

-

Extremely accurate, surpassing the accuracy

requirements of the IEC1036 Specification with less

than 0.1% error over a 1000 : 1 dynamic range

-

On-chip programmable current input gain suitable for

use with low-resistance shunt resistor or current

transformer

-

On-chip programming for output pulse rate selection.

-

On-chip calibration eliminates the need for an external

resistor network or trim-potentiometer

-

Programmable on-chip creep prevention under no-load

condition

-

All on-chip programmable functions may be

reprogrammed a second time

-

Outputs directly drive an electromechanical counter or

a two phase stepper motor counter and consumption

LED indicator

-

Fast calibration pulse output for high speed manual or

automated calibration

-

On-chip voltage reference and power supply

monitoring

-

Bi-directional or unidirectional energy measurement,

with direction indication output available

Description

The AS8168 is a very accurate single-phase bi-directional

average energy measurement integrated circuit, which

surpasses all the accuracy requirements for IEC1036

alternating current static watt-hour meters. The measured

energy is converted into pulses with the number of output

pulses being proportional to the measured energy.

The AS8168 is ideal for use in ‘stand alone’ kWh meter

applications, where the IC directly drives an

electromechanical counter with a two-phase stepper

motor, or for more complex meter applications, the

AS8168 interfaces directly to a micro-controller.

The highly integrated AS8168 design includes all the

required functional blocks. The blocks comprise of analog

to digital converters (ADC) for the voltage and current

channels, digital filters, a digital signal processing block, a

control block and non-volatile calibration memory for the

on-chip programming. The on-chip programming enables

the setting of the current input gain, the anti-creep

threshold, the output pulse rates and the system

calibration. The high level of integration ensures a

minimum number of non-critical external components are

required.

The on-chip anti-creep circuit ensures that the AS8168

does not output pulses when the meter is in a no-load

condition and that the IEC1036 anti-creep test

requirements are fully complied with, for both direct or

transformer connection meters.

The AS8168 offers three different pulse outputs. A stepper

motor drive output for directly driving a stepper motor

display, a LED output for energy consumption indication

and a dedicated high frequency output for fast single point

system calibration.

The AS8168 is available in either surface mount SOIC-18

or dual-in-line DIP-18 packages.

Block Diagram

Σ∆-mod

VREF

Digital

Filter

Control

Power

Calculation

CAL

IP

VP

Σ∆-mod

Crystal

Osc

Non-volatile

Calibration

XIN

XOUT

POR

AGND

Buffer

IN

LED

Digital

Filter

MON

MOP

VN

Figure 1

Block diagram of the AS8168

AS8168

Single Phase Average Energy Metering IC

with On-Chip Calibration, Stepper Motor Drive and LED Output

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