CS5480
Three 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 4000:1
Dynamic Range
Current RMS Measurement Accuracy of 0.1% over 1000:1
Dynamic Range
3 Independent 24-bit, 4
th
-order, Delta-Sigma Modulators
for Voltage and Current Measurements
3 Configurable Digital Outputs for Energy Pulses,
Zero-crossing, or Energy Direction
Supports Shunt Resistor, CT, & Rogowski Coil Current
Sensors
On-chip Measurements & Calculations:
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Active, Reactive, and Apparent Power
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RMS Voltage and Current
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Power Factor and Line Frequency
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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
4mm x 4mm, 24-pin QFN Package
See
VDDA
Description
The CS5480 is a high-accuracy, three-channel, energy mea-
surement analog front end.
The CS5480 incorporates independent, 4
th
order, Delta-Sigma
analog-to-digital converters for every channel, reference cir-
cuitry, and the proven EXL signal processing core to provide
active, reactive, and apparent energy measurement. In addi-
tion, RMS and power factor calculations are available.
Calculations are output via 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.
Three 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 CS5480 is
designed to interface to a variety of voltage and current sen-
sors including shunt resistors, current transformers, and
Rogowski coils.
On-chip functionality makes digital calibration simple and ul-
tra-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 very low drift.
A single 3.3V power supply is required, and power consump-
tion is very low at <13mW. To minimize space requirements,
the CS5480 is offered in a low-cost, 4mm x 4mm 24-pin QFN
package.
VDDD
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ORDERING INFORMATION
RESET
CS5480
IIN1+
IIN1-
PGA
4th Order
Modulator
Digital
Filter
HPF
Option
SSEL
UART/SPI
Serial
Interface
CS
RX / SDI
TX / SDO
SCLK
VIN+
VIN-
4th Order
Modulator
IIN2+
IIN2-
PGA
4th Order
Modulator
Digital
Filter
HPF
Option
10x
Digital
Filter
HPF
Option
Calculation
VREF+
VREF-
Energy
To
Pulse
Conversion
DO1
DO2
DO3
Voltage
Reference
Temperature
Sensor
System
Clock
Clock
Generator
MODE
GNDA
XIN
XOUT
GNDD
Cirrus Logic, Inc.
Copyright
Cirrus Logic, Inc. 2012
(All Rights Reserved)
JUN’12
DS980F2
APEX [ CIRRUS LOGIC ]
