ADE7753ARSZ Analog Devices Inc, ADE7753ARSZ Datasheet - Page 23

• Manufacturer Part Number: ADE7753ARSZ
• Description: IC ENERGY METERING 1PHASE 20SSOP
• Manufacturer: Analog Devices Inc

Specifications of ADE7753ARSZ

• Input Impedance: 390 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 3mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP (0.200", 5.30mm Width)
• Meter Type: Single Phase
• Ic Function: Single-Phase Multifunction Metering IC
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADE7753ZEB - BOARD EVALUATION AD7753
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

DOUT
Channel 1 Sampling
The waveform samples can also be routed to the waveform
register (MODE[14:13] = 1,0) to be read by the system master
(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 Figure 52. 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 ADE7753
Serial Interface section. The interrupt request output IRQ stays
low until the interrupt routine reads the reset status register—
see the ADE7753 Interrupts section.
SCLK
IRQ
DIN
0.5V, 0.25V,
0.125V, 62.5mV,
31.3mV, 15.6mV,
READ FROM WAVEFORM
Figure 52. Waveform Sampling Channel 1
0
0 0 01 HEX
0V
V1
*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.
ANALOG
INPUT
RANGE
V1
V1P
V1N
SIGN
PGA1
×1, ×2, ×4,
×8, ×16
{GAIN[2:0]}
0x2851EC
0xD7AE4
CHANNEL 1 DATA
0x00000
2.42V, 1.21V, 0.6V
(24 BITS)
REFERENCE
ADC 1
Figure 51. ADC and Signal Processing in Channel 1
ADC OUTPUT
WORD RANGE
02875-0-050
{GAIN[4:3]}
Rev. A | Page 23 of 60
HPF
0x2851EC
0x000000
0xD7AE4
INTEGRATOR*
DIGITAL
Channel 1 RMS Calculation
Root mean square (rms) value of a continuous signal V(t) is
defined as
For time sampling signals, rms calculation involves squaring the
signal, taking the average and obtaining the square root:
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.
dt
CHANNEL 1
(CURRENT WAVEFORM)
DATA RANGE
VRMS =
VRMS =
V
V
rms
rms
=
=
T
1
N
1
50Hz
0x1EF73C
0x19CE08
0xE631F8
×
0x000000
0xEI08C4
0x000000
×
T
∫
60Hz
0
∑
CURRENT RMS (IRMS)
CALCULATION
WAVEFORM SAMPLE
REGISTER
ACTIVE AND REACTIVE
POWER CALCULATION
i
V
N
=
1
2
V
(
t
2
)
dt
) (
CHANNEL 1
(CURRENT WAVEFORM)
DATA RANGE AFTER
INTEGRATOR (50Hz)
CHANNEL 1
(CURRENT WAVEFORM)
DATA RANGE AFTER
INTEGRATOR (60Hz)
i
02875-0-052
ADE7753
(2)
(3)