Digital Filter
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
Calculation
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
4th Order
ΔΣ Modulator
HPF
Option
Digital Filter
Clock Generator
Temperature
Sensor
Voltage
Reference
4th Order
ΔΣ Modulator
HPF
Option
PGA
PGA
10x
10x M
U
X
UART/SPI
Serial
Interface
Configurable
Digital
Outputs
IIN1+
IIN2+
VIN1+
VIN2+
IIN1-
IIN2-
VIN1-
VIN2-
MODE
GNDA GNDDXIN XOUT CPUCLK
VREF-
VREF+
DO4
DO3
DO2
DO1
SCLK
TX/SDO
RX/SDI
SSEL
VDDDVDDA RESET
CS
System
Clock
Four Channel Energy Measurement IC
CS5484/80/90
Market Applications
Utility Meters
Power Supply Monitoring
Smart Appliances
Home Energy Management
Emerging Smart Home and Smart Grid
Applications
For manufacturers of utility meters, appliances and smart home energy solutions, Cirrus Logic’s
CS5484/80/90 family of analog front end (AFE) energy measurement ICs provide the industry’s
highest measurement accuracy and lowest cost, with the flexibility and ease of use to react quickly to
rapidly changing market conditions.
The CS548/9X family, when combined with an MCU of your choice, offers a clear alternative to
system-on-a-chip solutions, whose “one size fits all” approach limits the designers ability to optimize
the design for performance and cost requirements.
With an energy measurement accuracy of 0.1% over 4,000:1 dynamic range, the CS548/9X family
offers superior measurement performance with no user programming required, and ultra-fast calibration.
Its multiple interface options, including UART, SPI and four digital outputs, provide flexibility to quickly
react to changing market requirements. Plus, each digital output is individually configurable to provide
energy pulses, zero crossing, energy direction or interrupt functions on any of the provided pins.
Cirrus Logic, Inc.
2901 Via Fortuna
Austin, Texas 78746
United States
T +1-512-851-4000
F +1-512-851-4977
Toll-Free +1-800-888-5016
Sales Support
North America +1 800-625-4084
Asia Pacific +852 2376-0801
Japan +81 (3) 5226-7757
Europe/UK +44 (90) 1628-891-300
www.cirrus.com
ASuperior analog performance with ultra low
noise level and high SNR
AEnergy measurement accuracy of 0.1% over
4000:1 dynamic range
ACurrent RMS measurement accuracy of 0.1%
over 1000:1 dynamic range
A2, 3 or 4 independent 24-bit, 4th-order Delta
Sigma modulators for voltage and current
measurement
AConfigurable digital outputs for energy pulses,
zero crossing or energy direction
ASupports shunt resistor, CT and Rogowski coil
current sensors
AOn-chip measurements / calculations:
AActive, reactive and apparent power
ARMS voltage and current
APower factor and line frequency
AInstantaneous voltage, current and power
AOvercurrent, voltage sag and voltage
swell detection
AUART / SPI serial interface options
AInternal register protection via checksum and
write-protection
AOn-chip voltage reference (25 ppm/°C typ.)
ASingle 3.3V power supply
ALow power consumption: <13mW
ASmall, low cost package options
Features:
AFE + MCU Advantage vs Using SOCs
APre-programmed industry standard power calculations saves
money and accelerates production schedules and time to market
AUp to 10X faster calibration
APair Cirrus Logic AFE with cost-optimized microcontroller tailored to
the demands of the application
ALock in AFE for metrology and easily change MCU to quickly adapt
to changing market requirements
ANever pay for more memory, IO or performance than required
Electrical Specifications
Demonstration Board
The CDB5484/80/90U is an extensive tool designed to evaluate the
functionality and performance of the Cirrus Logic CS5484/80/90 family.
Shunt resistors, current transformers or Rogowski coils can be connected
to the analog inputs. Intuitive GUI software provides easy and full access
to the on-board CS5484/80/90 device and MCU. On-board LEDs and
LCD displays enable stand alone operation for extended testing. Getting
started with a CDB enables fast and easy preliminary evaluation of Cirrus
Logic’s AFE products.
Part CS5484 CS5480 CS5490 CS5467 CS5464 CS5463 CS5451A
ADC Converters 4 3 2 4 3 2 6
Current Sensor Options Shunt/CT/Rogowski Shunt/CT/Rogowski Shunt/CT/Rogowski Shunt/CT Shunt/CT Shunt/CT Shunt/CT
Active Energy
Accuracy
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
N/A
Reactive Energy
Accuracy
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.1% over 4000:1
dynamic range
0.2% over 1000:1
dynamic range
0.2% over 1000:1
dynamic range
0.2% over 1000:1
dynamic range
N/A
IRMS Accuracy 0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.1% over 1000:1
dynamic range
0.2% over 1000:1
dynamic range
N/A
SNR 80dB 80dB 80dB 78dB 78dB 78dB 77dB
Serial Communication SPI/ UART SPI/ UART UART SPI SPI SPI SPI
Digital Outputs 4x Configurable
Outputs
3x Configurable
Outputs
Single Configurable
Output
Energy Pulses Energy Pulses Energy Pulses —
VREF Drift 25ppm/C 25ppm/C 25ppm/C 40ppm/C 40ppm/C 40ppm/C 25ppm/C
Input Voltage 3.3V 3.3V 3.3V 5V Analog
3.3/5V Digital
5V Analog
3.3/5V Digital
5V Analog
3.3/5V Digital
3V Analog
3V Digital
Power Consumption <13mW <13mW <13mW 25mW 25mW 21mW 23mW
Package 28 QFN 24 QFN 16 SOIC 28 SSOP 28 SSOP 24 SSOP 28 SSOP
Percent Error (%)
1
0.5
0
-0.5
-1
Active Energy Accuracy
05 00 1000 4500400035003000250020001500
5
5
Lagging PF = 0.
Leading PF = 0.
PF=1
Reactive Energy Accuracy
Percent Error (%)
1
0.5
0
-0.5
-1
05 00 1000 4500400035003000250020001500
Percent Error (%)
1
0.5
0
-0.5
-1
IRMS Accuracy
05 00 1000 1500
lRMS Error
Current Dynamic Range (x :1) Current Dynamic Range (x :1)
