ASIC 7751 For Single Phase Kwh Meter

The OSE7751 is a high accuracy fault tolerant electrical energy measurement IC intendedFor use with two-wire distribution systems. The part specifications surpassThe accuracy requirements as quoted in the IEC1036 standard.The only analog circuitry used on the OSE7751 is in the ADCs and reference circuit.All other signal processing(eg. Multiplication and filter) is carried outIn the digital domain. This approach provides superior stability and accuracy overExtremes in environmental conditions and over time.The OSE7751 incorporates a novel fault detection scheme that both warns of faultConditions and allows the OSE7751 to continue accurate billing during a fault event.The OSE7751 does this by continuously monitoring both the phase and neutralCurrents. A fault is indicated when these currents differ by more than12.5%. Billing is continued using the larger.The OSE7751 supplies average real power information on the low frequency outputsF1 and F2. These logic outputs may be used to directly drive an electromechanicalCounter or interface to an MCU. The CF logic output gives instantaneous real powerInformation. This output is intended to be used for calibration purposes.The OSE7751 includes a power supply monitoring circuit on the AVDD supply pin. TheOSE7751 will remain in a reset condition until the supply voltage on AVDD reaches4 V. If the supply falls below 4 V, the OSE7751 will also be reset and no pulsesWill be issues on F1, F2 and CF.Internal phase matching circuitry ensures that the voltage and current channels areMatched whether the HPF in Channel 1 is on or off. An internal no-load thresholdEnsures that the OSE7751 does not exhibit any creep when there is no load.The OSE7751 is available in 24-lead DIP and SSOP packages. Every piece will be strictlyTested. ?This chip has been bulk used in India, China, and some other countriesFor more than 3 years. The first piece of Chinese 7751 ICs was from our factory.