3.4.3 Per-Cycle Accumulated Current Quantities

Depending on the AFE selected, the metrology module generates the following accumulated current (I²) quantities: CYCLE_I_A, CYCLE_I_B, CYCLE_I_C, CYCLE_I_Nm, CYCLE_I_A_F, CYCLE_I_B_F, CYCLE_I_C_F, and CYCLE_I_Nm_F.

CYCLE_I_x, CYCLE_I_x_F

These accumulators are in units of [Amp² samp scaled] in the [uQ24.40] format and represent the accumulated scaled current in the last line cycle measurement period. They are calculated according to the following formula:

Where,

• I_x_sample_i is i^th sampled current value of phase x in the present cycle
• x = [A, B, C, A_F, B_F, C_F]
• N = The number of samples in the last cycle

CYCLE_I_Nm, CYCLE_I_Nm_F

These accumulators are in units of [Amp² samp scaled] in the uQ24.40 format and represent the accumulated scaled neutral current in the last line cycle measurement period. They are calculated according to the following formula:

Where,

• I_x_sample_i is i^th sampled neutral current value in the present cycle
• x = [Nm, Nm_F]
• N = The number of samples in the last cycle

In the case of being multiplexed with temperature measurement acquisition, such as when using the PIC32CXMTC with an external ATSENSE301, slightly less performance may be expected than DSP-filtered full bandwidth data.