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Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
http://www.cirrus.com
CS5463
Single Phase, Bi-directional Power/Energy IC
Features
z Energy Data Linearity: ±0.1% of Reading
over 1000:1 Dynamic Range
z On-chip Functions:
- Instantaneous Voltage, Current, and Power
- I
RMS
and V
RMS
, Apparent, Reactive, and Active
(Real) Power
- Active Fundamental and Harmonic Power
- Reactive Fundamental, Power Factor, and Line
Frequency
- Energy-to-pulse Conversion
- System Calibrations and Phase Compensation
- Temperature Sensor
z
Meets accuracy spec for IEC, ANSI, JIS.
z Low Power Consumption
z Current Input Optimized for Sense Resistor.
z GND-referenced Signals with Single Supply
z On-chip 2.5 V Reference (25 ppm/°C typ)
z Power Supply Monitor
z Simple Three-wire Digital Serial Interface
z “Auto-boot” Mode from Serial E
2
PROM
z Power Supply Configurations:
VA+ = +5 V; AGND = 0 V; VD+ = +3.3 V to +5 V
Description
The CS5463 is an integrated power measure-
ment device which combines two ∆Σ
analog-to-digital converters, power calculation
engine, energy-to-frequency converter, and a
serial interface on a single chip. It is designed to
accurately measure instantaneous current and
voltage, and calculate V
RMS
, I
RMS
, instanta-
neous power, apparent power, active power, and
reactive power for single-phase, 2- or 3-wire
power metering applications.
The CS5463 is optimized to interface to shunt re-
sistors or current transformers for current
measurement, and to resistive dividers or poten-
tial transformers for voltage measurement.
The CS5463 features a bi-directional serial inter-
face for communication with a processor and a
programmable energy-to-pulse output function.
Additional features include on-chip functionality
to facilitate system-level calibration, temperature
sensor, voltage sag detection, and phase
compensation.
ORDERING INFORMATION:
See Page 44.
VA+ VD+
IIN+
IIN-
VIN+
VIN-
VREFIN
VREFOUT
AGND
XIN XOUT CPUCLK DGND
CS
SDO
SDI
SCLK
INT
Voltage
Reference
System
Clock
/K
Clock
Generat or
Serial
Interface
E-to-F
Power
Moni tor
PFMON
x1
RESET
Digital
Filter
Cal ibr ati on
MODE
Power
Calculation
Engine
4th Order ∆Σ
Modulator
2nd Order ∆Σ
Modulator
Temperature
Sensor
Digital
Filter
PGA
HPF
Option
HPF
Option
E1
E2
E3
x10
AUG ‘05
DS678PP1
CS5463
2 DS678PP1
TABLE OF CONTENTS
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Characteristics & Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Digital Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Voltage and Current Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Power Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Linearity Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.1 Voltage Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.2 Current Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 IIR Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 High-pass Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Performing Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.5 Energy Pulse Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.5.1 Active Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.5.2 Apparent Energy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5.3 Reactive Energy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5.4 Voltage Channel Sign Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5.5 PFMON Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5.6 Design Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.6 Sag and Fault Detect Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.7 On-chip Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.8 Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.9 System Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.10 Power-down States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.11 Oscillator Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.12 Event Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.12.1 Typical Interrupt Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.13 Serial Port Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.13.1 Serial Port Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.14 Register Paging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.15 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.15.1 Start Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.15.2 SYNC0 and SYNC1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.15.3 Power-up/Halt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.15.4 Power-down and Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.15.5 Register Read/Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.15.6 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6. Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1 Page 0 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1.1 Configuration Register ( Config ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1.2 Current and Voltage DC Offset Register ( I
DCoff
, V
DCoff
) . . . . . . . . . . . . 27
6.1.3 Current and Voltage Gain Register ( I
gn
, V
gn
) . . . . . . . . . . . . . . . . . . . . 27
6.1.4 Cycle Count Register ( Cycle Count ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.5 PulseRateE Register ( PulseRateE ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.6 Instantaneous Current, Voltage, and Power Registers ( I , V , P ) . . . . . . 28
6.1.7 Active (Real) Power Register ( P
Active
) . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CS5463
DS678PP1 3
6.1.8 RMS Current & Voltage Registers ( I
RMS
, V
RMS
). . . . . . . . . . . . . . . . . . 28
6.1.9 Epsilon Register (
ε ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1.10 Power Offset Register ( P
off
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1.11 Status Register and Mask Register ( Status , Mask ) . . . . . . . . . . . . . . . 29
6.1.12 Current and Voltage AC Offset Register ( V
ACoff
, I
ACoff
). . . . . . . . . . . 30
6.1.13 Operational Mode Register ( Mode ). . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.1.14 Temperature Register ( T ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.1.15 Average and Instantaneous Reactive Power Register ( Q
AVG
, Q ) . . . . 31
6.1.16 Peak Current and Peak Voltage Register ( I
peak
, V
peak
) . . . . . . . . . . . . 31
6.1.17 Reactive Power Register ( Q
Trig
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.18 Power Factor Register ( PF ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.19 Apparent Power Register ( S ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.20 Control Register ( Ctrl ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1.21 Harmonic Active Power Register ( P
H
) . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1.22 Fundamental Active Power Register ( P
F
) . . . . . . . . . . . . . . . . . . . . . . 33
6.1.23 Fundamental Reactive Power Register ( Q
H
) . . . . . . . . . . . . . . . . . . . . 34
6.1.24 Page Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.2 Page 1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.2.1 Temperature Gain Register ( T
Gain
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.2.2 Temperature Offset Register ( T
Off
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3 Page 3 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.3.1 Voltage Sag and Current Fault Duration Registers
( VSAG
Duration
, ISAG
Duration
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.3.2 Voltage Sag and Current Fault Level Registers
( VSAG
Level
, ISAG
Level
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7. System Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.1 Channel Offset and Gain Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.1.1 Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.1.1.1 Duration of Calibration Sequence . . . . . . . . . . . . . . . . . . . . . 36
7.1.2 Offset Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.1.2.1 DC Offset Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . 36
7.1.2.2 AC Offset Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . 37
7.1.3 Gain Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.1.3.1 AC Gain Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . . 37
7.1.3.2 DC Gain Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . . 38
7.1.4 Order of Calibration Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.2 Phase Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.3 Active Power Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8. Auto-boot Mode Using E
2
PROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.1 Auto-boot Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2 Auto-boot Data for E
2
PROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.3 Which E
2
PROMs Can Be Used? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9. Basic Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
10. Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
11. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
12. Environmental, Manufacturing, & Handling Information . . . . . . . . . . . . . . . . . 44
13. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
CS5463
4 DS678PP1
LIST OF FIGURES
Figure 1. CS5463 Read and Write Timing Diagrams.................................................................. 12
Figure 2. Timing Diagram for
E1, E2 and E3 ............................................................................... 13
Figure 3. Data Measurement Flow Diagram. .............................................................................. 14
Figure 4. Power Calculation Flow. .............................................................................................. 15
Figure 5. Active and Reactive energy pulse outputs................................................................... 17
Figure 6. Apparent energy pulse outputs.................................................................................... 18
Figure 7. Voltage Channel Sign Pulse outputs ........................................................................... 18
Figure 8. PFMON output to pin
E3 .............................................................................................. 19
Figure 9. Sag and Fault Detect ................................................................................................... 19
Figure 10. Oscillator Connection................................................................................................. 20
Figure 11. CS5463 Memory Map................................................................................................ 22
Figure 12. Calibration Data Flow ................................................................................................36
Figure 13. System Calibration of Offset ...................................................................................... 36
Figure 14. System Calibration of Gain. ....................................................................................... 37
Figure 15. Example of AC Gain Calibration ................................................................................ 37
Figure 16. Example of AC Gain Calibration ................................................................................ 37
Figure 17. Typical Interface of E
2
PROM to CS5463................................................................... 39
Figure 18. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)40
Figure 20. Typical Connection Diagram (Single-phase, 3-wire).................................................. 41
Figure 19. Typical Connection Diagram (Single-phase, 2-wire – Isolated from Power Line)...... 41
Figure 21. Typical Connection Diagram (Single-phase, 3-wire – No Neutral Available)............. 42
LIST OF TABLES
Table 1. Current Channel PGA Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 2. E2
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 3. E3
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 4. Interrupt Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CS5463
DS678PP1 5
1. OVERVIEW
The CS5463 is a CMOS monolithic power measurement device with a computation engine and an ener-
gy-to-frequency pulse output. The CS5463 combines a programmable gain amplifier, two ∆Σ Ana-
log-to-Digital Converters (ADCs), system calibration and a computation engine on a single chip.
The CS5463 is designed for power measurement applications and is optimized to interface to a current
sense resistor or transformer for current measurement, and to a resistive divider or potential transformer
for voltage measurement. The current channel provides programmable gains to accommodate various in-
put levels from a multitude of sensing elements. With single +5 V supply on VA+/AGND, both of the
CS5463’s input channels can accommodate common mode plus signal levels between (AGND - 0.25 V)
and VA+.
The CS5463 also is equipped with a computation engine that calculates instantaneous power, I
RMS
,
V
RMS
, apparent power, active (real) power, reactive power, harmonic active power, active and reactive
fundamental power, and power factor. The CS5463 additional features include line frequency, current and
voltage sag detection, zero-cross detection, positive-only accumulation mode, and three programmable
pulse output pins. To facilitate communication to a microprocessor, the CS5463 includes a simple
three-wire serial interface which is SPI™ and Microwire™ compatible. The CS5463 provides three out-
puts for energy registration. E1
, E2 and E3 are designed to interface to a microprocessor.
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