ADE7762 Datasheet, PDF (1/28 Pages) Analog Devices – Polyphase Energy Metering IC with Phase Drop Indication

Polyphase Energy Metering IC with Phase
Drop Indication
Preliminary Technical Data
ADE7762
FEATURES
High accuracy supports 50 Hz/60 Hz IEC62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Compatible with 3-phase 3-wire delta and 3-phase 4-wire Wye
configurations
Supplies average active power on the frequency outputs F1 and F2
High frequency output (CF) is intended for calibration and
supplies instantaneous active power
Logic output REVP indicates a potential miswiring or negative
power on the sum of all phases
Dropout indication for each phase on LED driver pins
Phase sequence error detection
Direct drive for electromechanical counters and 2-phase stepper
motors (F1 and F2)
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time
On-chip power supply monitoring
On-chip creep protection (no load threshold)
On-chip reference 2.4 V ± 8% (25 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (TBD mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The ADE7762¹ is a high accuracy polyphase electrical energy
measurement IC. The ADE7762 specifications surpass the
accuracy requirements as quoted in the IEC62053-21 standard.
The only analog circuitry used in the ADE7762 is in the
analog-to-digital converters (ADCs) and reference circuit. All
other signal processing (for example, multiplication, filtering,
and summation) is carried out in the digital domain. This
approach provides superior stability and accuracy over
extremes in environmental conditions and over time.
The ADE7762 supplies average active power information on the
low frequency outputs, F1 and F2. These logic outputs can be
used to directly drive an electromechanical counter or to inter-
face with an MCU. The CF logic output gives instantaneous
active power information. This output is intended to be used for
calibration purposes.
The ADE7762 includes a power supply monitoring circuit on the
VDD pin. The ADE7762 remains inactive until the supply voltage
on VDD reaches 4 V. If the supply falls below 4 V, the ADE7762
also resets and no pulses are issued on F1, F2, and CF.
A multiple multiplexed logic output provides phase dropout per
phase, reverse polarity per phase, and a phase sequence error.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched. An internal no load
threshold ensures the ADE7762 does not exhibit any creep
when there is no load.
The ADE7762 is available in a 28-lead SOIC package.
1 _{Patent pending.}
FUNCTIONAL BLOCK DIAGRAM
ABS
V_DD
19
5
IAP 7
IAN 8
VAP ¹⁸
ADC
ADC
HPF
Φ
X
LPF
POWER
SUPPLY
MONITOR
IBP 9
IBN 10
VBP ¹⁷
ADC
ADC
ICP 11
ICN 12
VCP 16
VN 15
ADC
ADC
4kΩ
2.4V REF
HPF
Φ
HPF
Φ
PHASE AND REVP MONITOR
ADE7762
X
Σ
LPF
4 DGND
21 _CLKIN
22 CLKOUT
X
LPF
DIGITAL-TO-FREQUENCY CONVERTER
13
AGND
14
1
2
28
27
6
20
23
24
25
26
3
REF_IN/OUT LED_CTRL LED_A LED_B LED_C REVP SCF S0 S1 F2 F1 CF
Figure 1.
Rev. PrB
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