Energy Measurement. CS5484 Datasheet

CS5484 Measurement. Datasheet pdf. Equivalent

Part CS5484
Description 4-Channel Energy Measurement
Feature CS5484 Four Channel Energy Measurement IC Features & Description • Superior Analog Performance wit.
Manufacture Cirrus Logic
Datasheet
Download CS5484 Datasheet



CS5484
CS5484
Four Channel Energy Measurement IC
Features & Description
• Superior Analog Performance with Ultra-low Noise Level
and High SNR
• Energy Measurement Accuracy of 0.1% over 4000:1
Dynamic Range
• Current RMS Measurement Accuracy of 0.1% over 1000:1
Dynamic Range
• 4 Independent 24-bit, 4th-order, Delta-Sigma Modulators
for Voltage and Current Measurements
• 4 Configurable Digital Outputs for Energy Pulses,
Zero-crossing, or Energy Direction
• Supports Shunt Resistor, CT, and Rogowski Coil Current
Sensors
• On-chip Measurements/Calculations:
- Active, Reactive, and Apparent Power
- RMS Voltage and Current
- Power Factor and Line Frequency
- Instantaneous Voltage, Current, and Power
• Overcurrent, Voltage Sag, and Voltage Swell Detection
• Ultra-fast On-chip Digital Calibration
• Internal Register Protection via Checksum and Write
Protection
• UART/SPI™ Serial Interface
• On-chip Temperature Sensor
• On-chip Voltage Reference (25ppm/°C Typ.)
• Single 3.3V Power Supply
• Ultra-fine Phase Compensation
• Low Power Consumption: <13mW
• Power Supply Configurations
- GNDA = GNDD = 0V, VDDA = +3.3V
• 5mmx5mm 28-pin QFN Package
ORDERING INFORMATION
See Page 68.
Description
The CS5484 is a high-accuracy, four-channel, energy
measurement analog front end.
The CS5484 incorporates independent 4th order Delta-Sigma
analog-to-digital converters for every channel, reference
circuitry, and the proven EXL signal processing core to provide
active, reactive, and apparent energy measurement. In
addition, RMS and power factor calculations are available.
Calculations are output through a configurable energy pulse,
or direct UART/SPI™ serial access to on-chip registers.
Instantaneous current, voltage, and power measurements are
also available over the serial port. Multiple serial options are
offered to allow customer flexibility. The SPI provides higher
speed, and the 2-wire UART minimizes the cost of isolation
where required.
Four configurable digital outputs provide energy pulses,
zero-crossing, energy direction, and interrupt functions.
Interrupts can be generated for a variety of conditions
including voltage sag or swell, overcurrent, and more. On-chip
register integrity is assured via checksum and write protection.
The CS5484 is designed to interface to a variety of voltage and
current sensors including shunt resistors, current
transformers, and Rogowski coils.
On-chip functionality makes digital calibration simple and
ultra-fast, minimizing the time required at the end of the
customer production line. Performance across temperature is
ensured with an on-chip voltage reference with low drift. A
single 3.3V power supply is required, and power consumption
is low at <13mW. To minimize space requirements, the
CS5484 is offered in a low-cost, 5mm x5mm 28-pin QFN
package.
IIN1+
IIN1-
VDDA
PGA
IIN2+
IIN2-
PGA
4th Order 
Modulator
4th Order 
Modulator
RESET
Digital
Filter
HPF
Option
Digital
Filter
HPF
Option
VIN1+
VIN1-
10x
4th Order 
Modulator
Digital
Filter
HPF
Option
VIN2+
VIN2-
MODE
10x
M
U
X
Temperature
Sensor
4th Order 
Modulator
Digital
Filter
HPF
Option
System
Clock
Clock
Generator
VDDD
CS5484
UART/SPI
Serial
Interface
Calculation
Configurable
Digital
Outputs
Voltage
Reference
SSEL
CS
RX / SDI
TX / SDO
SCLK
DO1
DO2
DO3
DO4
VREF+
VREF-
Cirrus Logic, Inc.
http://www.cirrus.com
GNDA
XIN XOUT CPUCLK
GNDD
Copyright Cirrus Logic, Inc. 2013
(All Rights Reserved)
MAR’13
DS981F3



CS5484
CS5484
TABLE OF CONTENTS
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1 Analog Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1.1 Voltage Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1.2 Current Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1.3 Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1.4 Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Digital Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.1 Reset Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.2 CPU Clock Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.3 Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.4 UART/SPI™ Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.2.5 SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.2.6 UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.2.7 MODE Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3. Characteristics and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4. Signal Flow Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Analog-to-Digital Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Decimation Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3 IIR Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4 Phase Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5 DC Offset and Gain Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6 High-pass and Phase Matching Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7 Digital Integrators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8 Low-rate Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.1 Fixed Number of Samples Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.2 Line-cycle Synchronized Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.8.3 RMS Current and Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8.4 Active Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.8.5 Reactive Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8.6 Apparent Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8.7 Peak Voltage and Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8.8 Power Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.9 Average Active Power Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.10 Average Reactive Power Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Power-on Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Power Saving Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Zero-crossing Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4 Line Frequency Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.5 Energy Pulse Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.5.1 Pulse Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.5.2 Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.6 Voltage Sag, Voltage Swell, and Overcurrent Detection . . . . . . . . . . . . . . . . . . . . .24
2 DS981F3





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