ADE7878ACPZ Analog Devices Inc, ADE7878ACPZ Datasheet - Page 58

• Manufacturer Part Number: ADE7878ACPZ
• Description: IC ENERGY METERING 3PH 40LFCSP
• Manufacturer: Analog Devices Inc

Specifications of ADE7878ACPZ

• Input Impedance: 400 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.4V
• Current - Supply: 22mA
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN, CSP Exposed Pad
• Meter Type: 3 Phase
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LFCSP
• No. Of Pins: 40
• Msl: MSL 1 - Unlimited
• Peak Reflow Compatible (260 C): Yes
• Supply Voltage Min: 3V
• Rohs Compliant: Yes
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADE7878
When WATTACC[1:0] = 11, the active powers are accumulated
in absolute mode. When the powers are negative, they change
sign and accumulate together with the positive power. Figure 73
shows how absolute active power accumulation works. Note
that in this mode, the xWATTHR registers continue to accumulate
active powers in signed mode, even if the CFx pulses are
generated based on the absolute accumulation mode.
Bits[3:2] (VARACC[1:0]) in the ACCMODE[7:0] register deter-
mine the accumulation modes of the total and fundamental
reactive powers when signals proportional to the reactive powers
are chosen at the CFx pins (Bit CFxSEL[2:0] in the CFMODE[15:0]
register equals 001 or 100). When VARACC[1:0] = 00, the
default value, the reactive powers are sign accumulated before
entering the energy-to-frequency converter. Figure 74 shows
how signed reactive power accumulation works. Note that in
this mode, the CFx pulses are synchronized perfectly with the
reactive energy accumulated in the xVARHR registers because
the powers are sign accumulated in both datapaths.
ACTIVE ENERGY
ACTIVE POWER
THRESHOLD
THRESHOLD
REVAPx BIT
xWSIGN BIT
IN STATUS0
IN PHSIGN
NO-LOAD
NO-LOAD
Figure 73. Active Power Absolute Accumulation Mode
SIGN = POSITIVE
APNOLOAD
POS
NEG
POS
NEG
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When VARACC[1:0] = 10, the reactive powers are accumulated
depending on the sign of the corresponding active power. If the
active power is positive, the reactive power is accumulated as is.
If the active power is negative, the sign of the reactive power is
changed for accumulation. Figure 75 shows how the sign
adjusted reactive power accumulation mode works. Note that in
this mode, the xVARHR registers continue to accumulate
reactive powers in signed mode, even if the CFx pulses are
generated based on the sign adjusted accumulation mode.
xVARSIGN BIT
xVARSIGN BIT
Figure 75. Reactive Power Accumulation in Sign Adjusted Mode
THRESHOLD
THRESHOLD
THRESHOLD
THRESHOLD
THRESHOLD
REVRPx BIT
REVRPx BIT
IN STATUS0
IN STATUS0
IN PHSIGN
IN PHSIGN
REACTIVE
REACTIVE
REACTIVE
REACTIVE
NO-LOAD
NO-LOAD
NO-LOAD
NO-LOAD
NO-LOAD
ENERGY
ENERGY
Figure 74. Reactive Power Signed Accumulation Mode
POWER
POWER
POWER
ACTIVE
SIGN = POSITIVE
SIGN = POSITIVE
VARNOLOAD
VARNOLOAD
POS
POS
NEG
NEG
POS
POS
NEG