ADE7880 datasheet(21/104 Pages) AD

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Data Sheet

ADE7880

Rev. A | Page 21 of 104

PHASE

COUNTER = 1

PHASE

COUNTER = 2

PHASE

COUNTER = 3

LPLINE[4:0] = 2

IRQ1

IA CURRENT

LPOIL[2:0]

THRESHOLD

Figure 33. PSM2 Mode Triggering IRQ Pin for LPLINE[4:0] = 2 (50 Hz Systems)

The I2C 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

into Sleep Mode PSM3. If the

ADE7880

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

pins. This situation is often called missing neutral

and is considered a tampering situation, at which point the

external microprocessor sets the

into PSM1 mode,

measures the mean absolute values of phase currents, and

integrates the energy based on their values and the nominal

voltage.

ADE7880

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 I2C, 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.

Table 10. Power Modes and Related Characteristics

Power Mode

All Registers1

LPOILVL, CONFIG2

I2C/SPI

Functionality

PSM0

State After Hardware Reset

Set to default

I2C enabled

All circuits are active and DSP is in idle

mode.

State After Software Reset

Set to default

Unchanged

Active serial port is

unchanged if lock-

in procedure has

been previously

executed

All circuits are active and DSP is in idle

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 I2C 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.

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