ADE7758 line-cycle accumulation mode

Hello,

On the ADE7758 datasheet, it is written that for calibration with line-cycle accumulation mode, the RSTREAD of the LCYCMODE register must not be set.

But In this case, how to be sure that after the Lenergy IRQ, the content of the Energy registers are OK. Does the internal 41-bit active registers are automatically reset to 0 after each n zeor crossing detection (defined in the LINCYC register)?

Thank you for reply

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  • Hi Arnaud31,

    When using line-cycle accumulation, there is an internal accumulation for only the set number of line-cycles specified in the LINECYC register. That value is held in the xWATTHR register until the next value has accumulated for the number of line-cycles and then updated.  Whenever the xWATTHR register is read, it will always hold the value of the last line-cycle accumulation.  If read with reset is turned on then the reading will get reset  every time the register is read which can cause a jumpy and inconsistent reading.

    Best Regards,

    Dlath

  • Hello, I have a problem related to energy reading with the line cycles. When I measure with 60 half cycles, the AWATTHR value is constant, and then when I measure with 120 half cycles or more, the AWATTHR value varies and the AEHF bit of half full register is set. The constant voltage of phase A used is 120 Vrms and 10 A of current. My question is, the register AWATTHR overflows after the 0.5 seconds that the data sheet says?

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  • Hello, I have a problem related to energy reading with the line cycles. When I measure with 60 half cycles, the AWATTHR value is constant, and then when I measure with 120 half cycles or more, the AWATTHR value varies and the AEHF bit of half full register is set. The constant voltage of phase A used is 120 Vrms and 10 A of current. My question is, the register AWATTHR overflows after the 0.5 seconds that the data sheet says?

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