ADE7763_13 datasheet(44/56 Pages) AD

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ADE7763

Data Sheet

Rev. C | Page 44 of 56

CALCULATE CFDEN VALUE FOR DESIGN

WRITE CFDEN VALUE TO CFDEN REGISTER

ADDR. 0x15 = CFDEN

SET HALF LINE CYCLES FOR ACCUMULATION

IN LINECYC REGISTER ADDR. 0x1C

SET ITEST = Ib, VTEST = VNOM, PF = 1

CALCULATE WGAIN. SEE EQUATION 43.

SET MODE FOR LINE CYCLE

ACCUMULATION ADDR. 0x09 = 0x0080

ENABLE LINE CYCLE ACCUMULATION

INTERRUPT ADDR. 0x0A = 0x04

READ LINE ACCUMULATION ENERGY

ACTIVE ENERGY: ADDR. 0x04

APPARENT ENERGY: ADDR. 0x07

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. = 0x0C

INTERRUPT?

YES

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. = 0x0C

INTERRUPT?

WRITE WGAIN VALUE TO ADDR. 0x12

CALCULATE VAGAIN. SEE EQUATION 65.

WRITE VGAIN VALUE TO ADDR. 0x1A

Figure 78. Active/Apparent Gain Calibration

CLKIN FREQUENCY

In this data sheet, the characteristics of the ADE7763 are shown

when CLKIN frequency equals 3.579545 MHz. However, the

ADE7763 is designed to have the same accuracy at any CLKIN

frequency within the specified range. If the CLKIN frequency is

not 3.579545 MHz, various timing and filter characteristics will

need to be redefined with the new CLKIN frequency. For

example, the cutoff frequencies of all digital filters, such as

LPF1, LPF2, or HPF1, shift in proportion to the change in

CLKIN frequency according to the following equation:

MHz

579545

Frequency

CLKIN

Frequency

Original

Frequency

New

(69)

The change in CLKIN frequency does not affect the timing

characteristics of the serial interface because the data transfer is

synchronized with the serial clock signal (SCLK). However, it is

important to observe the read/write timing of the serial data

transfer—see the timing characteristics in Table 2. Table 8 lists

various timing changes that are affected by CLKIN frequency.

Table 8. Frequency Dependencies of the ADE7763

Parameters

Parameter

CLKIN Dependency

Nyquist Frequency for CH 1, CH 2 ADCs

CLKIN/8

PHCAL Resolution (seconds per LSB)

4/CLKIN

Active Energy Register Update Rate (Hz)

CLKIN/4

Waveform Sampling Rate (per second)

WAVSEL 1,0 =

0 0

CLKIN/128

0 1

CLKIN/256

1 0

CLKIN/512

1 1

CLKIN/1024

Maximum ZXTOUT Period

524,288/CLKIN

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