Watt-Hour Meters. AT73C502 Datasheet

AT73C502 Datasheet PDF, Equivalent


Part Number

AT73C502

Description

Chip Set Solution for Watt-Hour Meters

Manufacture

ATMEL Corporation

Total Page 28 Pages
PDF Download
Download AT73C502 Datasheet


AT73C502 Datasheet
Features
Fulfills IEC 1036, Class 1 Accuracy Requirements
Fulfills IEC 687, Class 0.5 and Class 0.2 Accuracy, with External Temperature
Compensated Voltage Reference
Simultaneous Active, Reactive and Apparent Power and Energy Measurement
Power Factor, Frequency, Voltage and Current Measurement
Single and Poly Phase Operation
Three Basic Operating Modes: Stand-Alone Mode, Microprocessor Mode and Multi-
Channel Mode
Flexible Interfacing, 8-bit Microprocessor Interface, 8-bit Status Output and Eight
Impulse Outputs
Calibration of Gain and Phase Error
Compensation of the Non-Linearity of Low Power Measurement
Adjustable Starting Current and Meter Constant
Measurement Bandwidth of 1000 Hz
Tamper Proof Design
Single +5V Supply
Description
A two chip solution, consisting of AT73C500 and AT73C501 (or AT73C502), offers all
main features required for the measurement and calculation of various power and
energy quantities in static Watt-hour meters. The devices operate according to
IEC1036, class 1, specification. IEC 687, class 0.5 and 0.2 requirements are fulfilled
when used with external temperature compensated voltage reference.
The AT73C501 contains six, high-performance, Sigma-Delta analog-to-digital convert-
ers (ADC). The AT73C500 is based on an efficient digital signal processor (DSP) core
and it supports interfacing both with the AT73C501 and with an external microproces-
sor. The AT73C500 DSP can also be used with the differential input ADC, AT73C502.
With this chipset, only a minimum of discrete components is required to develop prod-
ucts ranging from simple domestic Watt-hour meters to sophisticated industrial
meters. The chipset can be used in single-phase as well as in poly-phase systems.
The DSP core of the AT73C500 is easy to configure. By changing the mode of the
AT73C500, the device can be operated in a stand-alone environment or be used with
a separate control processor. It is also possible to configure the circuit to perform the
functions of three independent single phase Wh meters.
The chips support calibration of gain and phase error. All calibrations are done in the
digital domain and no trimming components are needed. The calibration coefficients
are either stored in an EEPROM memory or supplied by an external microprocessor.
(continued)
Chip Set
Solution for
Watt-Hour
Meters
AT73C500 with
AT73C501 or
AT73C502
Rev. 1035A–08/98
1

AT73C502 Datasheet
Figure 1. Block diagram of the AT73C500 chipset in stand-alone configuration
EXTERNAL CONNECTOR
L1 L2 L3
L1
L2
L3
VREF
BGD
VI1
VI2
VI3
CI1
CI2
CI3
RESET
CS
VDA
VDDA
VCC
AT73501
SIX SINGLE-ENDED,
INDEPENDENT
SIGMA-DELTA
CONVERTERS
PFAIL
ACK
DATA
CLKR
CLK
AGND
XI XO
MODE
VSA
VSSA
GND
VCC
BRDY
STROBE
RD/WR
ADDR1
AT73500
ADDR0
IRQ0
IRQ1
&
SOUT1
SOUT0
SIN
SCLK
DEDICATED DSP
FOR ENERGY
METERING
DATA BUS
XRES
STATUS BUS
GND
1
-VArh
+VArh
-Wh
+Wh
+Wh
-Wh
+VArh
-VArh
1&
RESET
1
&
CS AT93C46
SK DO
DI EEPROM
128*8 bit
MODE2
MODE1
MODE0
1
1
1
1
TAMP
STUP
L3
L2
L1
FAIL
DATRDY
INI
The AT73C500 is programmed to measure active, reactive
and apparent phase powers. Phase factors, phase volt-
ages, phase currents and line frequency are also mea-
sured, simultaneously. Based on the individual phase
powers, total active power is determined.
The power values are calculated over one-line frequency
cycle. The negative and positive results are accumulated in
different registers, which allows for separate billing of
imported and exported active energy. Also, the reactive
results are sorted depending on whether capacitive or
inductive load is applied.
Eight pulse outputs are provided. Each billing quantity
(+Wh, -Wh, +VArh, -Varh) is supplied with its own meter
constant output, as well as a display counter output. In
multi-channel mode, AT73C500 performs the functions of
three independent single phase Wh meters and three
impulse outputs are available, one for each meter element.
All measurement information is available on an 8-bit micro-
processor bus. The results are output in six packages, 16
bytes each. Mode and status information of the meter is
also transferred with each data block.
Figure 2. Block diagram of the AT73C500 chipset in microprocessor configuration
L1 L2 L3
L1
L2
L3
VREF
BGD
VI1
VI2
VI3
CI1
CI2
CI3
RESET
CS
VDA
VDDA
VCC
AT73501
SIX SINGLE-ENDED,
INDEPENDENT
SIGMA-DELTA
CONVERTERS
PFAIL
ACK
DATA
CLKR
CLK
AGND
XI XO
MODE
VSA
VSSA
GND
BRDY
IRQ0
IRQ1
SIN
SCLK
XRES
VCC
AT73500
DEDICATED DSP
FOR ENERGY
METERING
STROBE
RD/WR
ADDR1
ADDR0
SOUT1
SOUT0
DATA BUS
STATUS BUS
GND
AT90Sxx
D
DATRDY
MICROCONTROLLER
B9
&
1
MODEM
LCD
RESET
1
MODE2
MODE1
MODE0
1
1
1
1
B14
B13
B12
EEPROM
2 AT73C500


Features Datasheet pdf Features • Fulfills IEC 1036, Class 1 Accuracy Requirements • Fulfills IEC 687, Class 0.5 and Class 0.2 Accuracy, with External Temperature • • • • • • • • • • Compensa ted Voltage Reference Simultaneous Acti ve, Reactive and Apparent Power and Ene rgy Measurement Power Factor, Frequency , Voltage and Current Measurement Singl e and Poly Phase Operation Three Basic Operating Modes: Stand-Alone Mode, Micr oprocessor Mode and MultiChannel Mode F lexible Interfacing, 8-bit Microprocess or Interface, 8-bit Status Output and E ight Impulse Outputs Calibration of Gai n and Phase Error Compensation of the N on-Linearity of Low Power Measurement A djustable Starting Current and Meter Co nstant Measurement Bandwidth of 1000 Hz Tamper Proof Design Single +5V Supply Chip Set Solution for Watt-Hour Meters AT73C500 with AT73C501 or AT73C502 De scription A two chip solution, consisti ng of AT73C500 and AT73C501 (or AT73C50 2), offers all main features required for the measurement and calculation of various powe.
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