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PDF ADSST-EM-2030 Data sheet ( Hoja de datos )
| Número de pieza | ADSST-EM-2030 | |
| Descripción | 3-Phase Electronic Energy Meter Chipset | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Three-Phase Energy
Meter Chipset
ADSST-EM-2030*
FEATURES
3-Phase, 4-Wire Metering IC
High Accuracy Support for 50 Hz/60 Hz, IEC1036
Design Accuracy:
0.5% over 5% of Ib to 6% of Ib
0.65% over 2% of Ib to 5% of Ib
Measures:
kWh
kW
rms Voltage of Each Phase
rms Current of Each Phase
Phase and Nonlinearity Compensation for CTs
Potentiometer-Free Design
SPI Communication for:
Data to Microcontroller
Calibration
Programmable E-Pulse
Drive for:
Electromechanical Counter
2-Phase Stepper Motor Counter
Low Power (50 mW Typ)
DataSheet4U.com
FUNCTIONAL BLOCK DIAGRAM
E-PULSE
PT COUNTER
LCD DISPLAY
RTC
PT
PT ADSST-EM-2030
µCONTROLLER
CT
CT OP AMP + MUX
OPTICAL PORT
CT
POLY PHASE ENERGY METER USING THE ADSST-EM-2030
DataShee
GENERAL DESCRIPTION
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
IEC1036 standard.
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
operation.
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.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
DataSheet4Urues.leica,obnlmoer. fHoor waneyvienrf,rninogreemspeonntssoibfipliatyteisntassosruomtheedrbriyghAtnsaolof tghiDrdevpiacretsiefsotrhiatst
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
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ADSST-EM-2030
3. If the microcontroller does not get this acknowledgment from the
ADSST-EM-2030 within 5 ms then the microcontroller may
transmit this command to read the same data again.
4. After being sensed by the microcontroller, the ADSST-EM-2030
sends an acknowledgment to the microcontroller, the chipset
then prepares a packet of 10 bytes of requested data and starts
transmitting the bytes one by one at intervals of 5 ms. This
packet of 10 bytes also includes a header as the first byte of the
packet and checksum as the last byte.
5. The microcontroller can strip the data from this packet, compute
the checksum, and compare it with the last byte in the packet.
If the checksum does not match, the microcontroller should
then send the command again to ADSST-EM-2030 chipset.
The complete process of reading a packet of data should take
60 ms. The next command from the microcontroller to the
ADSST-EM-2030 can be sent immediately after receipt of data
or wait for the desired amount of time. The amount of time the
microcontroller should wait for the next command to be sent to
the ADSST-EM-2030 is purely dependent on the execution
of other functions on the microcontroller. It may be sufficient
for the microcontroller to collect data from the chipset after
every second. The remaining time may be used by the micro-
controller to perform other housekeeping functions.
For example, if the command sent by the microcontroller is 0x01,
the ADSST-EM-2030 adds 0x30 to it, making it 0x31, and sends
this to the microcontroller as an acknowledgment.
The data packet structure created by the ADSST-EM-2030 has
10 bytes. The first byte is a packet start byte (0xEE) and the last
byte is a checksum byte.
< START of Packet (0xEE) >< 8 Bytes of Data>
< CHECKSUM >
The checksum is calculated by adding the first nine bytes, includ-
ing the packet start byte.
CHECKSUM = 1st + 2nd + ...... ...... + 9th Byte
Table III shows various commands that can be sent to the ADSST-
EM-2030 chipset by the microcontroller on the SPI communication
port. The chipset returns a specific number of bytes for each data
parameter specified, in the data column of the table. The data
that can be read from the chipset could be calibration constants
or instantaneous data.
Table III. Read Commands to ADSST-EM-2030 on SPI
et4U.com
Function
Command to
ADSST-EM-2030 from C
GAIN CALIBRATION CONSTANTS
Read Voltage Gain Constants
Read Low Gain Current Constants
Read High Gain Current Constants
CONSTANTS
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0x01
0x02
0x03
POWER CALIBRATION CONSTANTS AT HIGH CURRENT RANGE
A-Phase Power Constant at High Current
(Including E-Pulse and Counter Pulse Constant)
0x07
B-Phase Power Constant at High Current
0x09
C-Phase Power Constant at High Current
0x0B
POWER CALIBRATION CONSTANTS AT LOW CURRENT RANGE
A-Phase Power Constant at Low Current
0x06
B-Phase Power Constant at Low Current
0x08
C-Phase Power Constant at Low Current
0x0A
PHASE COMPENSATION COEFFICIENTS
Read A-, B-, and C-Phase Coefficients
DC OFFSET CONSTANTS
Read DC Offset Constants
0x15
0x0E
INSTANTANEOUS PARAMETERS
Read Voltages for Phase A, B, and C
Read Currents for Phase A, B, and C
Read Energy and Power for Phase A, B, and C
0x0F
0x10
0x11
Number of Data Bytes
from ADSST-EM-2030
DataShee
6
6
6
4
2
2
2
2
2
6
6
6
6
8
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ADSST-EM-2030
Data Interpretation
The data sent by ADSST-EM-2030 is in Hex, and the microcontroller has to convert this and place the decimal point at the correct
place for display.
Table XVIII. Interpretation of the Voltage Data
The data sent for Voltage has a resolution up to two decimal places.
Each Phase Voltage Data
Hex Value (2 Byte)
Decimal Value
Voltage
5A10h
23056
230.56 V
Table XIX. Interpretation of the Current Data
The data sent for Current has a resolution up to three decimal places.
Each Phase Current Data
Hex Value (2 Byte)
Decimal Value
Current
278Bh
10123
10.123 A
Table XX. Interpretation of the Power Data
The data sent for Power has a resolution up to five decimal places.
Each Phase Power Data
Hex Value (4 Byte)
Decimal Value
Power
0D1C4Ah
859210
8.59210 kW
et4U.com
Table XXI. Interpretation of the Energy Data
The data sent for Energy has a resolution up to four decimal places.
Each Phase Energy Data
Hex Value (4 Byte)
0D1C4Ah
DataSDheeceitm4Ual.cVoamlue
859210
Energy
85.9210 kWh
DataShee
Data Write
Because microcontroller is the master for the SPI communication,
it has to send the desired commands for sending the data to the
ADSST-EM-2030. For the data transfer to take place, the following
sequence of operation has to occur:
1. The microcontroller should send the packet of 10 bytes including
the specific command to the ADSST-EM-2030 chipset to write
the desired data. Thus, the packet of 10 bytes includes a header
as the first byte of the packet, a specific command for write
data, and checksum as the last byte.
2. The ADSST-EM-2030 will receive the bytes one by one in
intervals of 5 ms.
3. The ADSST-EM-2030 strips the data from this packet, computes
the checksum and compares it with the last byte in the packet.
If the checksum does not match, the microcontroller should
send the command to the ADSST-EM-2030 chipset again, else
the ADSST-EM-2030 sends the acknowledgment of receipt of
all the bytes to be written.
4. To send the acknowledgment, the ADSST-EM-2030 adds
0x30 to the received command, which is then sent back to the
microcontroller.
5. If the microcontroller does not get this acknowledgment from the
ADSST-EM-2030 by 5 ms, then the microcontroller may
transmit this command to write the same data again.
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The complete process of writing a packet of data should take 60 ms.
The next command from the microcontroller to the ADSST-EM-
2030 can be sent immediately after receipt of data or wait for the
desired amount of time. The amount of time the microcontroller
waits for the next command to be sent to ADSST-EM-2030 is
purely dependent on the execution of other functions on the
microcontroller. It may be sufficient for the microcontroller to
collect data from the chipset after every one second. The
remaining time may be used by the microcontroller to perform
other housekeeping functions.
For example, if the command sent by the microcontroller is
0x01; the ADSST-EM-2030 adds 0x30 to it, making it 0x31,
and sends this to the microcontroller as an acknowledgment.
The data packet structure created by the ADSST-EM-2030 has
10 bytes. The first byte is a packet start byte (0xEE), and the
last byte is a checksum byte.
< START of Packet (0xEE) ><Command of 1 Byte>
< 7 Bytes of Data><CHECKSUM >
The checksum is calculated by adding the first nine bytes including
the Packet start byte.
CHECKSUM = 1st + 2nd + ...... ...... + 9th Byte
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| PDF Descargar | [ Datasheet ADSST-EM-2030.PDF ] | |
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