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參數(shù)資料
| 型號： | ADE7878ACPZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, MO-220WJJD, LFCSP-40 |
| 文件頁數(shù)： | 15/96頁 |
| 文件大?。?/td> | 1096K |
| 代理商： | ADE7878ACPZ-RL |
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ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 22 of 96
LPLINE[4:0] = 2 and LPOIL[2:0] = 3. The test period is three
50 Hz cycles (60 ms), and the Phase A current rises above the
LPOIL[2:0] threshold three times. At the end of the test period,
the IRQ1 pin is triggered low.
PHASE
COUNTER = 1
PHASE
COUNTER = 2
PHASE
COUNTER = 3
LPLINE[4:0] = 2
IRQ1
IA CURRENT
LPOIL[2:0]
THRESHOLD
08
51
0-
0
08
Figure 23. PSM2 Mode Triggering IRQ1 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 ADE7868/ADE7878 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 ADE7868/
ADE7878 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 ADE7868/ADE7878 pins. This situation is often
called missing neutral and is considered a tampering situation,
at which point the external microprocessor sets the ADE7868/
ADE7878 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 ADE7868/ADE7878 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 ADE7868/ADE7878
in PSM2 mode when the PGA1[2:0] bits are equal to 4, 8, or 16.
PSM3—SLEEP MODE (ALL PARTS)
The sleep mode is available on all parts (ADE7854, ADE7858,
ADE7868, and ADE7878). In this mode, the ADE78xx 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 func-
tional during this mode, and the RESET, SCLK/SCL, MOSI/SDA,
and SS/HSA pins should be set high.
Table 11. Power Modes and Related Characteristics
Power Mode
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—ADE7878, ADE7868 Only
Not available
Values set
during PSM0
unchanged
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—ADE7878, ADE7868 Only
Not available
Values set
during PSM0
unchanged
Disabled
Compares phase currents
against the threshold set
in LPOILVL. Triggers IRQ0
or IRQ1 pins accordingly.
The serial ports are not
available.
PSM3
Not available
Values set
during PSM0
unchanged
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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