ADE7753ARSZ Analog Devices Inc, ADE7753ARSZ Datasheet - Page 18

• 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

ADE7753
The zero-crossing detection also drives the ZX flag in the
interrupt status register. An active low in the
appears if the corresponding bit in the interrupt enable register
is set to Logic 1.
The flag in the interrupt status register as well as the
are reset to their default values when the interrupt status regis-
ter with reset (RSTSTATUS) is read.
Zero-Crossing Timeout
The zero-crossing detection also has an associated timeout
register, ZXTOUT. This unsigned, 12-bit register is decremented
(1 LSB) every 128/CLKIN seconds. The register is reset to its
user programmed full-scale value every time a zero crossing is
detected on Channel 2. The default power on value in this
register is 0xFFF. If the internal register decrements to 0 before a
zero crossing is detected and the DISSAG bit in the mode
register is Logic 0, the SAG pin goes active low. The absence of a
zero crossing is also indicated on the IRQ pin if the ZXTO
enable bit in the interrupt enable register is set to Logic 1.
Irrespective of the enable bit setting, the ZXTO flag in the
interrupt status register is always set when the internal
ZXTOUT register is decremented to 0—see the ADE7753
Interrupts section.
The ZXOUT register can be written/read by the user and has an
address of 1Dh—see the ADE7753 Serial Interface section. The
resolution of the register is 128/CLKIN seconds per LSB. Thus
the maximum delay for an interrupt is 0.15 second (128/CLKIN
× 2
Figure 41 shows the mechanism of the zero-crossing timeout
detection when the line voltage stays at a fixed dc level for more
than CLKIN/128 × ZXTOUT seconds.
PERIOD MEASUREMENT
The ADE7753 also provides the period measurement of the line.
The period register is an unsigned 16-bit register and is updated
every period. The MSB of this register is always zero.
12
REGISTER VALUE
).
12-BIT INTERNAL
CHANNEL 2
DETECTION
ZXTOUT
ZXTO
Figure 41. Zero-Crossing Timeout Detection
BIT
IRQ output also
IRQ
02875-0-041
output
Rev. A | Page 18 of 60
The resolution of this register is 2.2 ms/LSB when CLKIN =
3.579545 MHz, which represents 0.013% when the line fre-
quency is 60 Hz. When the line frequency is 60 Hz, the value of
the period register is approximately 7576d. The length of the
register enables the measurement of line frequencies as low as
13.9 Hz.
The period register is stable at ±1 LSB when the line is
established and the measurement does not change. A settling
time of 1.8 seconds is associated with this filter before the
measurement is stable.
POWER SUPPLY MONITOR
The ADE7753 also contains an on-chip power supply monitor.
The analog supply (AV
ADE7753. If the supply is less than 4 V ± 5%, then the ADE7753
goes into an inactive state, that is, no energy is accumulated
when the supply voltage is below 4 V. This is useful to ensure
correct device operation at power-up and during power-down.
The power supply monitor has built-in hysteresis and filtering,
which give a high degree of immunity to false triggering due to
noisy supplies.
As seen in Figure 42, the trigger level is nominally set at 4 V. The
tolerance on this trigger level is about ±5%. The SAG pin can
also be used as a power supply monitor input to the MCU. The
SAG pin goes logic low when the ADE7753 is in its inactive
state. The power supply and decoupling for the part should be
such that the ripple at AVDD does not exceed 5 V ±5%, as
specified for normal operation.
LINE VOLTAGE SAG DETECTION
In addition to the detection of the loss of the line voltage signal
(zero crossing), the ADE7753 can also be programmed to detect
when the absolute value of the line voltage drops below a
certain peak value for a number of line cycles. This condition is
illustrated in Figure 43.
POWER-ON
INACTIVE
ADE7753
STATE
AV
SAG
DD
5V
4V
0V
INACTIVE
Figure 42. On-Chip Power Supply Monitor
DD
) is continuously monitored by the
ACTIVE
TIME
INACTIVE
02875-0-042