ADE7763ARS datasheet(43/56 Pages) AD

43 / 56 page

ADE7763

Rev. A | Page 43 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 A

ACTIVE ENERGY: ADDR. 0x04

APPARENT ENERGY: ADDR. 0x07

CCUMULATION ENERGY

RESET THE INTERRUPT STATUS

READ REGISTER ADDR. = 0x0C

INTERRUPT?

YES

RESET THE INTERRUPT STA

READ REGIS

TUS

TER ADDR. = 0x0C

INTERRUPT?

YES

WRITE WGAIN VALUE TO ADDR. 0x12

CALCULATE VAGAIN. SEE EQUATION 65.

WRITE VGAIN VALUE TO ADDR. 0x1A

Figure 78. Active/Apparent

In th

ADE7763 are sh

cy is

5 MHz, various timing and filter characteristics will

equency according to the following equation:

Gain Calibration

CLKIN FREQUENCY

is data sheet, the characteristics of the

own

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 frequen

not 3.57954

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 fr

MHz

Frequency

New

579545

Frequency

CLKIN

Frequency

Original

(69)

The change in CLKIN frequency does not affect the timing

characteristics of the serial interface because the data transfer is

ever, it is

e read/write timing of the serial data

tran

le 2. Table 8 li

Table 8. Frequency Dependencies of the ADE7763 Parameters

Parameter

CLKIN Dependency

synchronized with the serial clock signal (SCLK). How

important to observe th

sfer—see the timing characteristics in Tab

sts

various timing changes that are affected by CLKIN frequenc

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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