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BL0921 Datasheet(PDF) 1 Page - SHANGHAI BELLING CO., LTD. |
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BL0921 Datasheet(HTML) 1 Page - SHANGHAI BELLING CO., LTD. |
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1 / 13 page  BL0921 BL0921 BL0921 BL0921 http://www.belling.com.cn - 1 - 3/15/2007 Total 13 Pages Single Phase Energy Meter IC Single Phase Energy Meter IC Single Phase Energy Meter IC Single Phase Energy Meter IC with Integrated Oscillator with Integrated Oscillator with Integrated Oscillator with Integrated Oscillator FEATURES High accuracy, less than 0.1% error over a dynamic range of 500: 1 On-chip oscillator as clock source Exactly measure the real power in the positive orientation and negative orientation, calculate the energy in the same orientation Two current monitors continuously monitor the phase and neutral currents in two-wire distribution systems. Uses the larger of two currents to bill, even during a Fault condition A PGA in the current channel allows using small value shunt and burden resistance The low frequency outputs F1 and F2 can directly drive electromechanical counters and two phase stepper motors and the high frequency output CF, supplies instantaneous real power, is intended for calibration and communications Two logic outputs REVP and FAULT can be used to indicate a potential orientation or Fault condition On-Chip power supply detector On-Chip anti-creep protection On-Chip voltage reference of 2.5V±8% Single 5V supply Low static power (typical value of 25mW). The technology of SLiM (Smart–Low–current– Management) is used. Credible work, working time is more than twenty years Interrelated patents are pending DESCRIPTION The BL0921 is a low cost, high accuracy, high stability, simple peripheral circuit electrical energy meter IC. The meter based on the BL0921 is intended for using in single-phase, two-wire distribution systems. It can exactly measure the real power in the positive orientation and negative orientation and calculate the energy in the same orientation. The BL0921 incorporates a novel fault detection scheme that both warns of fault conditions and allows the BL0921 to continue accurate billing during a fault event. The BL0921 does this by continuously monitoring both the phase and neutral (return) currents. PIN12 (FAULT) indicates Fault condition, when these currents differ by more than 12.5%. Billing is continued using the larger of the two currents when the difference is greater than 14%. The BL0921 supplies average real power information on the low frequency outputs F1 (Pin16) and F2 (Pin15). These logic outputs may be used to directly drive an electromechanical counter and two-phase stepper motors. The CF (Pin14) logic output gives instantaneous real power information. This output is intended to be used for calibration purposes or interface to an MCU. BL0921 thinks over the stability of reading error in the process of calibration. Bulk test data indicate that in the condition of small signal 5%Ib (Ib=5A), the error of CF is less than 0.1%. An internal no-load threshold ensures that the BL0921 does not exhibit any creep when there is no load. BLOCK DIAGRAM 1 2 3 5 6 7 8 9 10 12 14 15 16 4 VDD V1A V1B V1N V2N V2P VREF GND S1 S0 REVP CF F2 F1 BL0921 BL0921 BL0921 BL0921 11 G 13 FAULT current sampling voltage sampling analog to digital high pass filter digital multiplic ation digital to frequency and output low pass filter V1A V1A V1A V1A V1N V1N V1N V1N V1B V1B V1B V1B V2P V2P V2P V2P V2N V2N V2N V2N REVP REVP REVP REVP CF CF CF CF F1 F1 F1 F1 F2 F2 F2 F2 BL0921 BL0921 BL0921 BL0921 VDD VDD VDD VDD power detector voltage reference VREF VREF VREF VREF analog to digital input contron logic contron G GG G S0 S0 S0 S0 S1 S1 S1 S1 FAULT FAULT FAULT FAULT high pass filter internal oscillator SOP 16 |
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Similar Description - BL0921 |
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