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EVAL-ADE7763EB View Datasheet(PDF) - Analog Devices

Part Name
Description
MFG CO.
'EVAL-ADE7763EB' PDF : 56 Pages View PDF
ADE7763
2.42V, 1.21V, 0.6V
×1, ×2, ×4, REFERENCE
×8, ×16
{GAIN[2:0]}
V1P
V1
PGA1
ADC 1
{GAIN[4:3]}
HPF
DIGITAL
INTEGRATOR*
dt
V1N
V1
0.5V, 0.25V,
0.125V, 62.5mV,
31.3mV, 15.6mV,
0V
ANALOG
INPUT
RANGE
0x28 51EC
0x0 0000
0xD 7AE4
ADC OUTPUT
WORD RANGE
0x28 51EC
CHANNEL 1
(CURRENT WAVEFORM)
DATA RANGE
0x00 0000
0xD 7AE4
CURRENT RMS (IRMS)
CALCULATION
WAVEFORM SAMPLE
REGISTER
ACTIVE AND REACTIVE
POWER CALCULATION
50Hz
0x1E F73C
CHANNEL 1
(CURRENT WAVEFORM)
DATA RANGE AFTER
INTEGRATOR (50Hz)
0x00 0000
0xEI 08C4
60Hz
0x19 CE08
CHANNEL 1
(CURRENT WAVEFORM)
DATA RANGE AFTER
INTEGRATOR (60Hz)
*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 IS NOT ATTENUATED FURTHER.
Figure 43. ADC and Signal Processing in Channel 1
0x00 0000
0xE6 31F8
Channel 1 Sampling
The waveform samples may be routed to the waveform register
(MODE[14:13] = 1, 0) for the system master (MCU) to read. In
waveform sampling mode, set the WSMP bit (Bit 3) in the
interrupt enable register to Logic 1. The active and apparent
power as well as the energy calculation remain uninterrupted
during waveform sampling.
In waveform sampling mode, choose one of four output sample
rates using Bits 11 and 12 of the mode register (WAVSEL 1, 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 Figure 44. The 24-bit wave-
form samples are transferred from the ADE7763 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 Serial Interface
section. The interrupt request output IRQ stays low until the
interrupt routine reads the reset status register—see the
Interrupts section.
IRQ
SCLK
DIN
DOUT
READ FROM WAVEFORM
0 0 0 01 HEX
SIGN
CHANNEL 1 DATA
(24 BITS)
Figure 44. Waveform Sampling Channel 1
Channel 1 RMS Calculation
The root mean square (rms) value of a continuous signal V(t) is
defined as
VRMS =
1
T
T
×V
0
2 (t)dt
(2)
For time sampling signals, the rms calculation involves squaring
the signal, taking the average, and obtaining the square root:
VRMS =
1
N
×V
2 (i)
(3)
N i=1
The ADE7763 simultaneously calculates the rms values for
Channel 1 and Channel 2 in different registers. Figure 45 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
1 LSB of a Channel 1 waveform sample. The update rate of the
Channel 1 rms measurement is CLKIN/4.
Rev. A | Page 21 of 56
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