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PL7301 (WT7751)  

OVERVIEW

The PL7301(WT7751) is a high accuracy fault tolerant electrical energy measurement IC intended for use with two-wire distribution systems. It provides instantaneous and average real power based on line current and voltage. The part specifications surpass the accuracy requirements as stated in the IEC61036 standard. The only analog circuitry used in the PL7301 is in the ADCs and reference circuit. All other signal processing (e.g., multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The current channel has a high gain mode for interfacing to low value shunt resistances without losing dynamic range. Gain calibration between channels is adjusted external to this device. The PL7301, available in SSOP packages, having low frequency (F1/F2) and high frequency (CF) outputs are synchronized under all load conditions.

FEATURE

  • Supports IEC 62053 International Energy Metering Specification and legacy IEC 61036/687/1036 Specifications
  • Three one-bit DAC、 second-order, 16-bit, delta sigma Analog-to-Digital Converters(ADCs). Less than 0.1% Error over a Dynamic Range of 500 to 1
  • Supplies Average Real Power Measurement for Single-Phase on the Frequency Outputs F1 and F2
  • The Calibration and Instantaneous Real Power Can be Monitored through The High-Frequency Output CF
  • The PL7301 Uses the Larger of the Two Currents (Phase or Neutral) to Bill Even During a Fault Condition
  • Two Logic Outputs (FAULT and REVP) Can Be Used to Indicate a Potential Mis-wiring or Fault Condition
  • Direct Drive for Two Phase Stepper Motors and Electromechanical Counters
  • 16:1 PGA for small signal inputs supports low value shunt current sensor
  • On-Chip Power Supply Monitoring
  • On-Chip Creep Protection (No Load Threshold)
  • On-Chip Reference 2.5 V (30 ppm/℃Typical)
  • Single 5 V Supply, Low Power (15 mW Typical)

APPLICATIONS

 

  • 1P2W/1P3W KWH Meter

PACKAGE

  • SSOP-24
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