Analog Devices ADSST-EM-3040 specifications Features, General Description, High accuracy

Powerful Energy Meter Chipset

ADSST-SALEM-3T

FEATURES

High accuracy

Supports IEC 60687/61036 and ANSI C12.1/12.20 Suitable for class0.5 and class0.2 meter

Full four quadrant measurement of parameters SPI® compatible serial interface

Pulse output with programmable pulse constant as pulses/kWh or Wh/pulse

Programmable duty cycle for pulse output

chipset can be interfaced to any general-purpose microproces- sor to develop state of the art tri-vector or polyphase energy metering solutions with a wide range of basic currents from 1 A to 30 A. By incorporating a comprehensive data set of parame- ters, including instantaneous measurements, accumulated parameters, and harmonic analysis data, the ADSST-SALEM-3T chipset meets high end energy metering requirements. The abil- ity to easily configure the chipset for various parameters makes it a very flexible solution.

Embedded calibration routines for gain and dc offset

Software based phase and nonlinearity compensation for current transformers

15 kHz sampling frequency

UART mode enables a PC to directly access all computed parameters

Flags to indicate tamper conditions Single 3.0 V supply

The phase and nonlinearity compensation for current transformers is done in software (patent pending) without having to use any passive components in the circuit for compensation, thus minimizing variations in accuracy with temperature and time.

The ADSST-SALEM-3T measures and computes a large num- ber of parameters essential for high end metering.

Developer’s kit to accelerate design process (See Ordering Guide for separate ordering number.)

GENERAL DESCRIPTION

The ADSST-SALEM-3T energy meter chipset consists of an efficient ADSST-218x digital signal processor (DSP), a fast and accurate 6-channel, 16-bit ADSST-73360LAR sigma-delta ana- log-to-digital converter (ADC), and metering software. Two chipset versions are available to support differing ranges of operating temperature: The ADSST-EM-3040 chipset is rated at 0°C to 70°C for commercial applications, while the ADSST-EM- 3041 chipset operates at –25°C to +85°C for industrial use.

SMPS LCD DISPLAY

Table 1.

Parameter	Each Phase	Total
RMS Voltage
RMS Current
Active Power
Apparent Power
Inductive Reactive Power
Capacitive Reactive Power
Power Factor
Frequency
Positive Active Energy
Negative Active Energy
Apparent Energy
Positive Inductive Reactive Energy

RESISTOR				SPI BUS
BLOCK			DSP			∝C
					BOOT
	CT		ADC		FLASH
	CT
		ADSST-EM-3040		FLASH
	CT
					RTC

Figure 1. Block Diagram of a Functional Meter

BUTTONS

OPTO

RS-232

03738-0-001

Negative Inductive Reactive Energy

Positive Capacitive Reactive Energy

Negative Capacitive Reactive Energy

Voltage Magnitude and Phase for All

Odd Harmonics up to 21st Order

Current Magnitude and Phase for All

Odd Harmonics up to 21st Order

The ADC and DSP are interfaced to simultaneously acquire voltage and current samples on all three phases and to perform mathematically intensive computations to calculate various instantaneous parameters and perform harmonic analysis. The

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

The ADSST-SALEM-3T offers some excellent features that make the final meter cost-effective and easy to manufacture.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700www.analog.com

Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.