3-Phase, 4-Wire Metering IC
High Accuracy Support for 50 Hz/60 Hz, IEC1036
0.5% over 5% of Ib to 6% of Ib
0.65% over 2% of Ib to 5% of Ib
rms Voltage of Each Phase
rms Current of Each Phase
Phase and Nonlinearity Compensation for CTs
SPI Communication for:
Data to Microcontroller
2-Phase Stepper Motor Counter
Low Power (50 mW Typ)
FUNCTIONAL BLOCK DIAGRAM
CT OP AMP + MUX
POLY PHASE ENERGY METER USING THE ADSST-EM-2030
ADSST-EM-2030 is a highly accurate and low cost phase
energy measurement IC intended to be used in 3-phase, 4-wire
systems. When used with an op amp and a multiplexer, the
ADSST-EM-2030 surpasses the accuracy requirement of the
ADSST-EM-2030 is a MicroConverter® consisting of a microcon-
troller, 6-channel, 12-bit ADC, SPI port, program memory and
Flash for storage of constants. The only analog circuitry used in
ADSST-EM-2030 is the ADC. All other signal processing is carried
out in digital domain. This provides superior accuracy over extreme
environmental conditions and time.
ADSST-EM-2030 can drive an electromechanical counter or a
2-phase stepper motor counter, or can be interfaced to a
microcontroller to build a feature-rich meter with LCD, maximum
demand, time of use, and communication.
Ratio, phase, and nonlinearity errors of the CTs are compensated
for by using software. This reduces the cost of CTs and reduces
calibration time caused by unreliable potentiometers.
Because the ADSST-EM-2030 is a low power device, it can be
powered by a simple R-C power supply, reducing the cost of
ADSST-EM-2030 supplies average real power information on
the low frequency outputs F1 and F2. These logic outputs can
be used to drive an electromechanical counter. The CF logic pin
gives the instantaneous real power information. This output is
intended to be used for calibration.
ADSST-EM-2030 is available in a 28-lead SSOP package.
*Protected by U.S.Patent No. 5,969,657; other patents pending.
MicroConverter is a registered trademark of Analog Devices.
Information furnished by Analog Devices is believed to be accurate and
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may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2002
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