CS5490
Two Channel Energy Measurement IC
Features
& Description
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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, 4
th
-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:
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Active, Reactive, and Apparent Power
RMS Voltage and Current
Power Factor and Line Frequency
Instantaneous Voltage, Current, and Power
Description
The CS5490 is a high-accuracy, two-channel, energy measure-
ment analog front end.
The CS5490 incorporates independent 4
th
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.
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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:
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GNDA = 0 V, VDDA: +3.3 V
ORDERING INFORMATION
See
RESET
VDDD
Low-cost 16-pin SOIC Package
VDDA
CS5490
IIN+
IIN-
PGA
4th Order
Modulator
Digital
Filter
HPF
Option
UART
Serial
Interface
VIN+
VIN-
10x
4th Order
Modulator
Digital
Filter
HPF
Option
Calculation
RX
TX
VREF+
VREF-
Voltage
Reference
Temperature
Sensor
System
Clock
Clock
Generator
Configurable
Digital
Output
DO
GNDA
XIN
XOUT
MODE
Cirrus Logic, Inc.
Copyright
Cirrus Logic, Inc. 2012
(All Rights Reserved)
JUN’12
DS982F2
APEX [ CIRRUS LOGIC ]
