3.3.1 Accumulated Phase Voltage Quantities

The metrology module generates the following accumulated phase voltage (V²) quantities: V_A, V_B, V_C, V_D, V_A_F, V_B_F, V_C_F, and V_D_F.

They are in units of [Volt²samp scaled]. They are scaled accumulated phase voltage quantities in the whole integration period. They are calculated according to the following formula:

Where,

V_x_sample_i is i^th sampled phase voltage value of phase x in present integration period
x = [A, B, C, D]
N = The number of samples in the last measurement interval

They may be used to calculate the RMS value of phase voltage.

The V_x and V_x_F are stored in the uQ24.40 format.

Note: V_D, available only when using an MCP3914 AFE or 4 MC3910s, provides an additional ADC conversion for the application. The metrology library processes this channel with all metrology filters except for phase correction. This includes the calibration gain and the DC block filter, in case VC_DC_EN is cleared.

Name:	V_A, V_B, V_C, V_D, V_A_F, V_B_F, V_C_F, V_D_F
Property:	Read


Bit	63	62	61	60	59	58	57	56
	V_x/V_x_F[63:56]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	55	54	53	52	51	50	49	48
	V_x/V_x_F[55:48]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	47	46	45	44	43	42	41	40
	V_x/V_x_F[47:40]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	39	38	37	36	35	34	33	32
	V_x/V_x_F[39:32]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	31	30	29	28	27	26	25	24
	V_x/V_x_F[31:24]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	V_x/V_x_F[23:16]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	V_x/V_x_F[15:8]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	V_x/V_x_F[7:0]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0

3.3.1 Accumulated Phase Voltage Quantities

Bits 63:0 – V_x/V_x_F[63:0] Volt-squared-samples, phase-x (uQ24.40)