ADE7753ARSZ datasheet(24/60 Pages) AD

24 / 60 page

ADE7753

Rev. C | Page 24 of 60

⋅ 1, ⋅ 2, ⋅ 4,

⋅ 8, ⋅ 16

ANALOG

INPUT

RANGE

DIGITAL

INTEGRATOR*

HPF

ADC 1

REFERENCE

2.42V, 1.21V, 0.6V

0.5V, 0.25V,

0.125V, 62.5mV,

31.3mV, 15.6mV,

CHANNEL 1

(CURRENT WAVEFORM)

DATA RANGE

ACTIVE AND REACTIVE

POWER CALCULATION

WAVEFORM SAMPLE

CURRENT RMS (IRMS)

CALCULATION

50Hz

V1P

V1N

PGA1

{GAIN[4:3]}

{GAIN[2:0]}

*WHEN DIGITAL INTEGRATOR IS ENABLED, FULL-SCALE OUTPUT DATA IS ATTENUATED

DEPENDING ON THE SIGNAL FREQUENCY BECAUSE THE INTEGRATOR HAS A –20dB/DECADE

FREQUENCY RESPONSE. WHEN DISABLED, THE OUTPUT WILL NOT BE FURTHER ATTENUATED.

ADC OUTPUT

WORD RANGE

0xD7AE14

0x00000

0x2851EC

0xD7AE14

0x000000

0x2851EC

CHANNEL 1

(CURRENT WAVEFORM)

DATA RANGE AFTER

INTEGRATOR (50Hz)

0xEI08C4

0x000000

0x1EF73C

60Hz

CHANNEL 1

(CURRENT WAVEFORM)

DATA RANGE AFTER

INTEGRATOR (60Hz)

0xE631F8

0x000000

0x19CE08

02875-0-052

Figure 51. ADC and Signal Processing in Channel 1

Channel 1 Sampling

The waveform samples can also be routed to the waveform

(MCU). In waveform sampling mode, the WSMP bit (Bit 3) in

the interrupt enable register must also be set to Logic 1. The

active, apparent power, and energy calculation remain

uninterrupted during waveform sampling.

When in waveform sampling mode, one of four output sample

rates can be chosen by using Bits 11 and 12 of the mode register

(WAVSEL1,0). The output sample rate can be 27.9 kSPS, 14 kSPS,

7 kSPS, or 3.5 kSPS—see the Mode Register (0x09) section. The

interrupt request output, IRQ, signals a new sample availability

by going active low. The timing is shown in

. The 24-bit

waveform samples are transferred from the ADE7753 one byte

(eight bits) at a time, with the most significant byte shifted out

first. The 24-bit data-word is right justified—see the

section. The interrupt request output

Figure 52

ADE7753

Serial Interface

IRQ stays

low until the interrupt routine reads the reset status register—

see the

section.

ADE7753 Interrupts

CHANNEL 1 DATA

(24 BITS)

READ FROM WAVEFORM

SIGN

IRQ

SCLK

DIN

DOUT

0 0 01 HEX

02875-0-050

Figure 52. Waveform Sampling Channel 1

Channel 1 RMS Calculation

Root mean square (rms) value of a continuous signal V(t) is

defined as

VRMS

∫

rms

)

(

(2)

For time sampling signals, rms calculation involves squaring the

signal, taking the average and obtaining the square root:

VRMS

∑

rms

)

(

(3)

The ADE7753 simultaneously calculates the rms values for

Channel 1 and Channel 2 in different registers. Figure 53 shows

the detail of the signal processing chain for the rms calculation

on Channel 1. The Channel 1 rms value is processed from the

samples used in the Channel 1 waveform sampling mode. The

Channel 1 rms value is stored in an unsigned 24-bit register

(IRMS). One LSB of the Channel 1 rms register is equivalent to

one LSB of a Channel 1 waveform sample. The update rate of

the Channel 1 rms measurement is CLKIN/4.

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