Analog Devices ADSST-EM-3040 - Manual
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Table of Contents:
- Page 2 – TABLE OF CONTENTS; REVISION HISTORY
- Page 7 – CLOCK SIGNALS; RESET; is; RECOMMENDED OPERATING CONDITIONS; Parameter Min
- Page 8 – ADSST-218X ELECTRICAL CHARACTERISTICS
- Page 9 – ABSOLUTE MAXIMUM RATINGS—ADSST-218X; Rating; ESD CAUTION
- Page 10 – PIN CONFIGURATION—ADSST-218X
- Page 12 – to
- Page 14 – ABSOLUTE MAXIMUM RATINGS—ADSST-73360LAR; Parameter Rating
- Page 15 – PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS—ADSST-73360LAR; PIN FUNCTION DESCRIPTIONS; Mnemonic
- Page 16 – GROUNDING AND LAYOUT
- Page 17 – VOLTAGE AND CURRENT SENSING; Potential Section; Handle high surge voltages; Current Section; This generates 0.656 V rms or
- Page 18 – ACCURACY OF REFERENCE DESIGN USING THE ADSST-SALEM-3T CHIPSET; Overall Accuracy, Power, and Energy Measurement; Table 12. Unbalanced Load Error
- Page 19 – Table 18. Starting Current
- Page 20 – OUTLINE DIMENSIONS
- Page 21 – ORDERING GUIDE; Part Number
- Page 22 – NOTES
Powerful Energy Meter Chipset
ADSST-SALEM-3T
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
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
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
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.
µ
C
DSP
BUTTONS
CT
SMPS
LCD DISPLAY
RTC
FLASH
SPI BUS
RS-232
OPTO
CT
CT
ADC
ADSST-EM-3040
RESISTOR
BLOCK
BOOT
FLASH
0 3 7 3 8 - 0 - 0 0 1
Figure 1. Block Diagram of a Functional Meter
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
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.
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.
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
Negative Inductive Reactive Energy
Positive Capacitive Reactive Energy
Negative Capacitive Reactive Energy
Voltage Magnitude and Phase for All
Odd Harmonics up to 21
st
Order
Current Magnitude and Phase for All
Odd Harmonics up to 21
st
Order
The ADSST-SALEM-3T offers some excellent features that
make the final meter cost-effective and easy to manufacture.
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Summary
ADSST-SALEM-3T Rev. 0 | Page 2 of 24 TABLE OF CONTENTS Easy Calibration............................................................................ 3 Effective Phase Compensation ................................................... 3 Ease of Design........................................................
ADSST-SALEM-3T Rev. 0 | Page 7 of 24 CLOCK SIGNALS Either a crystal or a TTL compatible clock signal can clock the ADSST-218x. If an external clock is used, it should be a TTL compatible signal running at half the instruction rate. The signal is connected to the processor’s CLKIN input. When an exte...
ADSST-SALEM-3T Rev. 0 | Page 8 of 24 ADSST-218X ELECTRICAL CHARACTERISTICS Table 4. Parameter Test Conditions Min Typ Max Unit V IH High Level Input Voltage 1, 2 @ V DDINT = Max 1.5 V V IH High Level CLKIN Voltage @ V DDINT = Max 2.0 V V IL Low Level Input Voltage 1, 3 @ V DDINT = Min 0.7 V V OH Hig...
