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Data Sheet
IA CURRENT
LPLINE[4:0] = 2
LPOIL[2:0]
THRESHOLD
ADE7880
into Sleep Mode PSM3. If the IRQ1 pin is triggered low at 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.
PHASE
COUNTER = 1
PHASE
COUNTER = 2
PHASE
COUNTER = 3
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
IRQ1
Figure 33. PSM2 Mode Triggering IRQ Pin for LPLINE[4:0] = 2 (50 Hz Systems)
The I 2 C or SPI port is not functional during this mode. The PSM2
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 IRQ0
pin is triggered low at the end of a measurement period, 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
Table 10. Power Modes and Related Characteristics
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 2 C, HSDC, and SPI ports are not functional during this
mode, and the RESET, SCLK/SCL, MOSI/SDA, and SS/HSA pins
should be set high.
Power Mode
All Registers 1
LPOILVL, CONFIG2
I 2 C/SPI
Functionality
PSM0
State After Hardware Reset
Set to default
Set to default
I 2 C enabled
All circuits are active and DSP is in idle
mode.
State After Software Reset
Set to default
Unchanged
Active serial port is
All circuits are active and DSP is in idle
unchanged if lock-
in procedure has
been previously
executed
mode.
PSM1
Not available
PSM0 values retained
Enabled
Current mean absolute values are
computed and the results are stored
in the AIMAV, BIMAV, and CIMAV
registers. The I 2 C or SPI serial port is
enabled with limited functionality.
PSM2
Not available
PSM0 values retained
Disabled
Compares phase currents against the
threshold set in LPOILVL. Triggers
IRQ0or IRQ1 pins accordingly. The
serial ports are not available.
PSM3
Not available
PSM0 values retained
Disabled
Internal circuits shut down and the
serial ports are not available.
1
Setting for all registers except the LPOILVL and CONFIG2 registers.
Rev. A | Page 21 of 104
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