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ADE7753ARS-ADE7753ARSRL-ADE7753ARSZ-ADE7753ARSZRL
Single Phase Multifunction Energy Metering IC with di/dt Input (Serial-Port Interface)
Single-Phase Multifunction Metering IC
with di/dt Sensor Interface
Rev. A
FEATURES
High accuracy; supports IEC 60687/61036/61268 and
IEC 62053-21/62053-22/62053-23
On-chip digital integrator enables direct interface to current
sensors with di/dt output
Active, reactive, and apparent energy; sampled waveform;
current and voltage rms
Less than 0.1% error in active energy measurement over a
dynamic range of 1000 to 1 at 25°C
Positive-only energy accumulation mode available
On-chip user programmable threshold for line voltage surge
and SAG and PSU supervisory
Digital calibration for power, phase, and input offset
On-chip temperature sensor (±3°C typical)
SPI® compatible serial interface
Pulse output with programmable frequency
Interrupt request pin (IRQ) and status register
Reference 2.4 V with external overdrive capability
Single 5 V supply, low power (25 mW typical)
GENERAL DESCRIPTION The ADE7753 features proprietary ADCs and DSP for high
accuracy over large variations in environmental conditions and
time. The ADE7753 incorporates two second-order 16-bit Σ-∆
ADCs, a digital integrator (on CH1), reference circuitry,
temperature sensor, and all the signal processing required to
perform active, reactive, and apparent energy measurements,
line-voltage period measurement, and rms calculation on the
voltage and current. The selectable on-chip digital integrator
provides direct interface to di/dt current sensors such as
Rogowski coils, eliminating the need for an external analog
integrator and resulting in excellent long-term stability and pre-
cise phase matching between the current and voltage channels.
The ADE7753 provides a serial interface to read data, and a
pulse output frequency (CF), which is proportional to the active
power. Various system calibration features, i.e., channel offset
correction, phase calibration, and power calibration, ensure high
accuracy. The part also detects short duration low or high
voltage variations.
The positive-only accumulation mode gives the option to
accumulate energy only when positive power is detected. An
internal no-load threshold ensures that the part does not exhibit
any creep when there is no load. The zero-crossing output (ZX)
produces a pulse that is synchronized to the zero-crossing point
of the line voltage. This signal is used internally in the line cycle
active and apparent energy accumulation modes, which enables
faster calibration.
The interrupt status register indicates the nature of the interrupt,
and the interrupt enable register controls which event produces
an output on the IRQ pin, an open-drain, active low logic output.
The ADE7753 is available in a 20-lead SSOP package.
FUNCTIONAL BLOCK DIAGRAM
AVDDDVDDDGND
CLKINCLKOUTDINDOUTSCLKREFIN/OUTCSIRQAGND02875-A-001
V1P
V1N
V2PFigure 1.
*U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others pending.
TABLE OF CONTENTS Specifications.....................................................................................3
Timing Characteristics.....................................................................5
Absolute Maximum Ratings............................................................6
ESD Caution..................................................................................6
Terminology......................................................................................7
Pin Configuration and Function Descriptions.............................8
Typical Performance Characteristics...........................................10
Theory of Operation......................................................................15
Analog Inputs..............................................................................15
di/dt Current Sensor and Digital Integrator...........................16
Zero-Crossing Detection...........................................................17
Period Measurement..................................................................18
Power Supply Monitor...............................................................18
Line Voltage Sag Detection........................................................18
Peak Detection............................................................................19
ADE7753 Interrupts...................................................................20
Temperature Measurement.......................................................21
ADE7753 Analog-to-Digital Conversion................................21
Channel 1 ADC...........................................................................22
Channel 2 ADC...........................................................................24
Phase Compensation..................................................................26
Active Power Calculation..........................................................27
Energy Calculation.....................................................................28
Power Offset Calibration...........................................................30
Energy-to-Frequency Conversion...........................................30
Line Cycle Energy Accumulation Mode.................................32
Positive-Only Accumulation Mode.........................................32
No-Load Threshold....................................................................32
Reactive Power Calculation......................................................33
Sign of Reactive Power Calculation.........................................34
Apparent Power Calculation.....................................................34
Apparent Energy Calculation...................................................35
Line Apparent Energy Accumulation......................................36
Energies Scaling..........................................................................37
Calibrating an Energy Meter Based on the ADE7753...........37
CLKIN Frequency......................................................................47
Suspending ADE7753 Functionality........................................47
Checksum Register.....................................................................47
ADE7753 Serial Interface..........................................................48
ADE7753 Registers.........................................................................51
ADE7753 Register Descriptions...................................................54
Communications Register.........................................................54
Mode Register (0x09).................................................................54
Interrupt Status Register (0x0B), Reset Interrupt Status
Register (0x0C), Interrupt Enable Register (0x0A)...............56
CH1OS Register (0x0D)............................................................57
Outline Dimensions.......................................................................58
Ordering Guide..........................................................................58
REVISION HISTORY
6/04—Changed from Rev. 0 to Rev A Changes IEC Standards...................................................................1
Changes to Phase Error Between Channels Definition...............7
Changes to Figure 24......................................................................13
Changes to CH2OS Register.........................................................16
Change to the Period Measurement Section...............................18
Change to Temperature Measurement Section..........................21
Changes to Figure 69......................................................................31
Changes to Figure 71......................................................................33
Changes to the Apparent Energy Section....................................36
Changes to Energies Scaling Section...........................................37
Changes to Calibration Section....................................................37
8/03—Revision 0: Initial Version SPECIFICATIONS AVDD = DVDD = 5 V ± 5%, AGND = DGND = 0 V, on-chip reference, CLKIN = 3.579545 MHz XTAL, TMIN to TMAX = –40°C to +85°C.
Table 1.
_______ See the plots in the Typical Performance Characteristics section.
2 See the Terminology section for explanation of specifications.
3 See the Analog Inputs section.
+2.1V
1.6mAIOH200µA
50pFOUTPUT
PIN
TIMING CHARACTERISTICSAVDD = DV = 5 V ± 5%, AGND = DGND = 0 V, on-chip reference, CLKIN = 3.579545 MHz XTAL, TDDMIN to TMAX = –40°C to +85°C.
Table 2. _______________
1 Sample tested during initial release and after any redesign or process change that could affect this parameter. All input signals are specified with tr = tf = 5 ns
(10% to 90%) and timed from a voltage level of 1.6 V.
2 See Figure 3, Figure 4, and the ADE7753 Serial Interface section. Minimum time between read command and data read for all registers except waveform register, which is t9 = 500 ns min.
4 Measured with the load circuit in Figure 2 and defined as the time required for the output to cross 0.8 V or 2.4 V. Derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit in Figure 2. The measured number is then extrapolated back
to remove the effects of charging or discharging the 50 pF capacitor. This means that the time quoted in the timing characteristics is the true bus relinquish time of
the part and is independent of the bus loading.
DIN
COMMAND BYTEMOST SIGNIFICANT BYTELEAST SIGNIFICANT BYTE02875-0-081
Figure 3. Serial Write Timing
SCLK
DIN
DOUT
COMMAND BYTEMOST SIGNIFICANT BYTELEAST SIGNIFICANT BYTE02875-0-083
