Rainbow Electronics AT73C502 - Manual

1
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
• Fulfills IEC 1268, Requirements for Reactive Power
• 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 an efficient digital signal processor (DSP) that supports
interfacing both with the AT73C501 and with an external microprocessor. The
AT73C500 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 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 con-
trol 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)
Chipset
Solution for
Watt-hour
Meters
AT73C500 with
AT73C501 or
AT73C502
Rev. 1035B–09/99