ADE7878ACPZ Analog Devices Inc, ADE7878ACPZ Datasheet - Page 60

• 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

ADE7854/ADE7858/ADE7868/ADE7878
Bits[14:12] (CF3LATCH, CF2LATCH, and CF1LATCH) of the
CFMODE register enable this process when set to 1. When
cleared to 0, the default state, no latch occurs. The process is
available even if the CFx output is not enabled by the CFxDIS
bits in the CFMODE register.
CF Outputs for Various Accumulation Modes
Bits[1:0] (WATTACC[1:0]) in the ACCMODE register deter-
mine the accumulation modes of the total active and fundamental
powers when signals proportional to the active powers are chosen
at the CFx pins (the CFxSEL[2:0] bits in the CFMODE register
equal 000 or 011). When WATTACC[1:0] = 00 (the default value),
the active powers are sign accumulated before entering the energy-
to-frequency converter. Figure 73 shows how signed active power
accumulation works. In this mode, the CFx pulses synchronize
perfectly with the active energy accumulated in xWATTHR regis-
ters because the powers are sign accumulated in both data paths.
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 74
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 gener-
ated based on the absolute accumulation mode.
Bits[3:2] (VARACC[1:0]) in the ACCMODE register determine the
accumulation modes of the total and fundamental reactive powers
when signals proportional to the reactive powers are chosen at the
CFx pins (the CFxSEL[2:0] bits in the CFMODE register equal
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 75 shows how signed
reactive power accumulation works. In this mode, the CFx
pulses synchronize perfectly with the reactive energy accumu
ACTIVE ENERGY
ACTIVE POWER
THRESHOLD
THRESHOLD
REVAPx BIT
xWSIGN BIT
IN STATUS0
IN PHSIGN
NO-LOAD
NO-LOAD
Figure 73. Active Power Signed Accumulation Mode
SIGN = POSITIVE
APNOLOAD
POS
NEG
POS
NEG
Rev. D | Page 60 of 96
lated in the xVARHR registers because the powers are sign
accumulated in both datapaths.
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 76 shows how the sign adjusted
reactive power accumulation mode works. 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.
ACTIVE ENERGY
ACTIVE POWER
xVARSIGN BIT
THRESHOLD
THRESHOLD
REVRPx BIT
THRESHOLD
THRESHOLD
IN STATUS0
REVAPx BIT
xWSIGN BIT
IN STATUS0
IN PHSIGN
REACTIVE
REACTIVE
NO-LOAD
NO-LOAD
IN PHSIGN
ENERGY
NO-LOAD
NO-LOAD
Figure 75. Reactive Power Signed Accumulation Mode
Figure 74. Active Power Absolute Accumulation Mode
POWER
SIGN = POSITIVE
SIGN = POSITIVE
VARNOLOAD
APNOLOAD
POS
POS
NEG
NEG
POS
POS
NEG
NEG