Energy Measurement. CS5490 Datasheet

CS5490 Measurement. Datasheet pdf. Equivalent

Part CS5490
Description 2-Channel Energy Measurement
Feature CS5490 Two Channel Energy Measurement IC Features Description • Superior Analog Performance with.
Manufacture Cirrus Logic
Datasheet
Download CS5490 Datasheet



CS5490
CS5490
Two Channel Energy Measurement IC
Features
Description
• Superior Analog Performance with Ultra-low Noise Level &
High SNR
• Energy Measurement Accuracy of 0.1% over a 4000:1
Dynamic Range
• Two Independent 24-bit, 4th-order, Delta-Sigma
Modulators for Voltage and Current Measurements
• Configurable Digital Output for Energy Pulses, Interrupt,
zero-crossing, and 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
• Configurable No-load Threshold for Anti-creep
• Internal Register Protection via Checksum and Write
Protection
• UART Serial Interface
• On-chip Temperature Sensor
• On-chip Voltage Reference (25ppm/°C Typ.)
• Single 3.3 V Power Supply
• Ultra-fine Phase Compensation
• Low Power Consumption: <13 mW
• Power Supply Configurations:
- GNDA = 0 V, VDDA: +3.3 V
• Low-cost 16-pin SOIC Package
The CS5490 is a high-accuracy, two-channel, energy measure-
ment analog front end.
The CS5490 incorporates independent 4th order Delta-Sigma an-
alog-to-digital converters for both channels, reference circuitry,
and the proven EXL signal processing core to provide active, re-
active, and apparent energy measurement. In addition, RMS and
power factor calculations are available. Calculations are output
via a configurable energy pulse, or direct UART serial access to
on-chip registers. Instantaneous current, voltage, and power
measurements are also available over the serial port. The
two-wire UART minimizes the cost of isolation where required.
A configurable digital output provides energy pulses, zero-cross-
ing, energy direction, or 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 CS5490 is designed to in-
terface 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 to minimize the time required at the end of the customer pro-
duction line. Performance across temperature is ensured with an
on-chip voltage reference with low drift. A single 3.3V power sup-
ply is required, and power consumption is low at <13mW. To
minimize space requirements, the CS5490 is offered in a low-cost
16-pin SOIC package.
ORDERING INFORMATION
See Page 57.
VDDA
RESET
VDDD
CS5490
IIN +
IIN-
PGA
4th Order 
Modulator
Digital
Filter
HPF
Option
VIN+
VIN-
10x
VREF+
VREF-
Voltage
Reference
Cirrus Logic, Inc.
http://www.cirrus.com
GNDA
4th Order 
Modulator
Digital
Filter
HPF
Option
Temperature
Sensor
System
Clock
Clock
Generator
Calculation
UART
Serial
Interface
RX
TX
Configurable
Digital
Output
DO
XIN XOUT
MODE
Copyright Cirrus Logic, Inc. 2013
(All Rights Reserved)
MAR’13
DS982F3



CS5490
CS5490
TABLE OF CONTENTS
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2. Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1 Analog Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1.1 Voltage Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1.2 Current Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
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 Digital Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.3 UART Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.3.1 UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2.4 MODE Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3. Characteristics & Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4. Signal Flow Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Analog-to-Digital Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Decimation Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 IIR Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Phase Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 DC Offset & Gain Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.6 High-pass & Phase Matching Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7 Digital Integrators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8 Low-rate Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8.1 Fixed Number of Samples Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8.2 Line-cycle Synchronized Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.8.3 RMS Current & Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8.4 Active Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.8.5 Reactive Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8.6 Apparent Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8.7 Peak Voltage & Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8.8 Power Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.9 Average Active Power Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.10 Average Reactive Power Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Power-on Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Power Saving Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3 Zero-crossing Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4 Line Frequency Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5 Energy Pulse Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5.1 Pulse Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.5.2 Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.6 Voltage Sag, Voltage Swell, and Overcurrent Detection . . . . . . . . . . . . . . . . . . . . .21
5.7 Phase Sequence Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.8 Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2 DS982F3





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