ade7880 Analog Devices, Inc., ade7880 Datasheet - Page 19

• Manufacturer Part Number: ade7880
• Description: Polyphase Multifunction Energy Metering Ic With Harmonic Monitoring
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
The I
mode reduces the power consumption required to monitor the
currents when there is no voltage input and the voltage supply
of the ADE7880 is provided by an external battery. If the
pin is triggered low at the end of a measurement period,
Table 10. Power Modes and Related Characteristics
Power Mode
PSM0
PSM1
PSM2
PSM3
1
Figure 8. PSM2 Mode Triggering IRQ1
Setting for all registers except the LPOILVL and CONFIG2 registers.
IA CURRENT
State After Hardware Reset
State After Software Reset
2
C or SPI port is not functional during this mode. The PSM2
IRQ1
PHASE
COUNTER = 1
PHASE
COUNTER = 2
LPLINE[4:0] = 2
Pin for LPLINE[4:0] = 2 (50 Hz Systems)
All Registers
Set to default
Set to default
Not available
Not available
Not available
PHASE
COUNTER = 3
1
LPOILVL,
CONFIG2
Set to default
Unchanged
PSM0 values
retained
PSM0 values
retained
PSM0 values
retained
THRESHOLD
LPOIL[2:0]
IRQ0
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I
I
Active serial port is unchanged if lock-
in procedure has been previously
executed
Enabled
Disabled
Disabled
2
2
C enabled
C/SPI
this signifies all phase currents stayed below threshold and,
therefore, there is no current flowing through the system.
At this point, the external microprocessor sets the ADE7880
into Sleep Mode PSM3. If the
end of the measurement period, this signifies that at least one
current input is above the defined threshold and current is
flowing through the system, although no voltage is present at
the ADE7880 pins. This situation is often called missing neutral
and is considered a tampering situation, at which point the
external microprocessor sets the ADE7880 into PSM1 mode,
measures the mean absolute values of phase currents, and
integrates the energy based on their values and the nominal
voltage.
It is recommended to use the ADE7880 in PSM2 mode when
Bits[2:0] (PGA1[2:0]) of the gain register are equal to 1 or 2.
These bits represent the gain in the current channel datapath. It
is not recommended to use the ADE7880 in PSM2 mode when
the PGA1[2:0] bits are equal to 4, 8, or 16.
PSM3—SLEEP MODE (ALL PARTS)
In sleep mode, the ADE7880 has most of its internal circuits
turned off and the current consumption is at its lowest level.
The I
mode, and the RESET, SCLK/SCL, MOSI/SDA, and
should be set high.
2
C, HSDC, and SPI ports are not functional during this
IRQ1 pin is triggered low at the
Functionality
All circuits are active and
DSP is in idle mode.
All circuits are active and
DSP is in idle mode.
Current mean absolute
values are computed and
the results are stored in
the AIMAV, BIMAV, and
CIMAV registers. The I
SPI serial port is enabled
with limited functionality.
Compares phase currents
against the threshold set
in LPOILVL. Triggers IRQ0
or IRQ1 pins accordingly.
The serial ports are not
available.
Internal circuits shut down
and the serial ports are
not available.
ADE7880
SS/HSA pins
2
C or