參數(shù)資料
型號(hào)： ADE7878ACPZ-RL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)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(yè)數(shù)： 30/96頁(yè)
文件大?。?/td> 1096K
代理商： ADE7878ACPZ-RL
ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 36 of 96
Figure 49 shows how the ADE78xx records the peak value on the
current channel when measurements on Phase A and Phase B are
enabled (Bit PEAKSEL[2:0] in the MMODE register are 011).
PEAKCYC is set to 16, meaning that the peak measurement
cycle is four line periods. The maximum absolute value of Phase A
is the greatest during the first four line periods (PEAKCYC = 16),
so the maximum absolute value is written into the less signifi-
cant 24 bits of the IPEAK register, and Bit 24 (IPPHASE[0]) of
the IPEAK register is set to 1 at the end of the period. This bit
remains at 1 for the duration of the second PEAKCYC period of
four line cycles. The maximum absolute value of Phase B is the
greatest during the second PEAKCYC period; therefore, the
maximum absolute value is written into the less significant
24 bits of the IPEAK register, and Bit 25 (IPPHASE[1]) in the
IPEAK register is set to 1 at the end of the period.
At the end of the peak detection period in the current channel,
Bit 23 (PKI) in the STATUS1 register is set to 1. If Bit 23 (PKI)
in the MASK1 register is set, the IRQ1 interrupt pin is driven low
at the end of PEAKCYC period and Status Bit 23 (PKI) in the
STATUS1 register is set to 1. In a similar way, at the end of the
peak detection period in the voltage channel, Bit 24 (PKV) in the
STATUS1 register is set to 1. If Bit 24 (PKV) in the MASK1
register is set, the IRQ1 interrupt pin is driven low at the end of
PEAKCYC period and Status Bit 24 (PKV) in the STATUS1
register is set to 1. To find the phase that triggered the interrupt,
one of either the IPEAK or VPEAK registers is read immediately
after reading the STATUS1 register. Next, the status bits are
cleared, and the IRQ1 pin is set to high by writing to the
STATUS1 register with the status bit set to 1.
Note that the internal zero-crossing counter is always active. By
setting Bits[4:2] (PEAKSEL[2:0]) in the MMODE register, the
first peak detection result is, therefore, not executed across a full
PEAKCYC period. Writing to the PEAKCYC register when the
PEAKSEL[2:0] bits are set resets the zero-crossing counter,
thereby ensuring that the first peak detection result is obtained
across a full PEAKCYC period.
Overvoltage and Overcurrent Detection
The ADE7854/ADE7858/ADE7868/ADE7878 detect when the
instantaneous absolute value measured on the voltage and
current channels becomes greater than the thresholds set in the
OVLVL and OILVL 24-bit unsigned registers. If Bit 18 (OV) in
the MASK1 register is set, the IRQ1 interrupt pin is driven low
in case of an overvoltage event. There are two status flags set
when the IRQ1 interrupt pin is driven low: Bit 18 (OV) in the
STATUS1 register and one of Bits[11:9] (OVPHASE[2:0]) in the
PHSTATUS register to identify the phase that generated the
overvoltage. The Status Bit 18 (OV) in the STATUS1 register
and all Bits[11:9] (OVPHASE[2:0]) in the PHSTATUS register
are cleared, and the IRQ1 pin is set to high by writing to the
STATUS1 register with the status bit set to 1.
presents
overvoltage detection in Phase A voltage.
OVLVL[23:0]
BIT 18 (OV) OF
STATUS1
BIT 9 (OVPHASE)
OF PHSTATUS
PHASE A
VOLTAGE CHANNEL
OVERVOLTAGE
DETECTED
STATUS1[18] AND
PHSTATUS[9]
CANCELLED BY A
WRITE OF STATUS1
WITH OV BIT SET.
0
85
10
-0
36
Figure 50. Overvoltage Detection
Whenever the absolute instantaneous value of the voltage goes
above the threshold from the OVLVL register, Bit 18 (OV) in
the STATUS1 register and Bit 9 (OVPHASE[0]) in the PHSTATUS
register are set to 1. Bit 18 (OV) of the STATUS1 register and
Bit 9 (OVPHASE[0]) in the PHSTATUS register are cancelled
when the STATUS1 register is written with Bit 18 (OV) set to 1.
The recommended procedure to manage overvoltage events is
the following:
1.
Enable OV interrupts in the MASK1 register by setting
Bit 18 (OV) to 1.
2.
When an overvoltage event happens, the IRQ1 interrupt
pin goes low.
3.
The STATUS1 register is read with Bit 18 (OV) set to 1.
4.
The PHSTATUS register is read, identifying on which
phase or phases an overvoltage event happened.
5.
The STATUS1 register is written with Bit 18 (OV) set to 1.
In this moment, Bit OV is erased and also all Bits[11:9]
(OVPHASE[2:0]) of the PHSTATUS register.
In case of an overcurrent event, if Bit 17 (OI) in the MASK1
register is set, the IRQ1 interrupt pin is driven low. Immediately,
Bit 17 (OI) in the STATUS1 register and one of Bits[5:3]
(OIPHASE[2:0]) in the PHSTATUS register, which identify
the phase that generated the interrupt, are set. To find the
phase that triggered the interrupt, the PHSTATUS register
is read immediately after reading the STATUS1 register. Next,
Status Bit 17 (OI) in the STATUS1 register and Bits[5:3]
(OIPHASE[2:0]) in the PHSTATUS register are cleared and the
IRQ1 pin is set to high by writing to the STATUS1 register with
the status bit set to 1. The process is similar with overvoltage
detection.
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