CS5461A
Single Phase, Bi-directional Power/Energy IC
Features
• Energy Data Linearity: ±0.1% of Reading over
1000:1 Dynamic Range
Description
The CS5461A is an integrated power measure-
ment device which combines two
∆Σ
analog-to-digital converters, power calculation
• On-chip Functions:
engine, energy-to-frequency converter, and a
-
Instantaneous Voltage, Current, and Power
serial interface on a single chip. It is designed to
-
I
RMS
and V
RMS
, Apparent and Active (Real) Power
accurately measure instantaneous current and
-
Energy-to-pulse Conversion for Mechanical
voltage, and calculate V
RMS
, I
RMS
, instanta-
Counter/Stepper Motor Drive
neous power, apparent power, and active power
-
System Calibrations and Phase Compensation
for single-phase, 2- or 3-wire power metering
-
Temperature Sensor
applications.
-
Voltage Sag Detect
• Meets Accuracy Spec for IEC, ANSI, & JIS.
• Low Power Consumption
• Current Input Optimized for Sense Resistor.
• GND-referenced Signals with Single Supply
• On-chip 2.5 V Reference (25 ppm/°C typ)
• Power Supply Monitor
• Simple Three-wire Digital Serial Interface
• “Auto-boot” Mode from Serial E
2
PROM.
• Power Supply Configurations:
VA+ = +5 V; AGND = 0 V; VD+ = +3.3 V to +5 V
VA+
RESET
The CS5461A is optimized to interface to shunt
resistors or current transformers for current mea-
surement, and to resistive dividers or potential
transformers for voltage measurement.
The CS5461A features a bi-directional serial in-
terface for communication with a processor, and
a programmable energy-to-pulse output func-
tion. Additional features include on-chip
functionality to facilitate system-level calibration,
temperature sensor, voltage sag detection, and
phase compensation.
ORDERING INFORMATION:
See
VD+
IIN+
IIN-
PGA
4th Order
∆Σ
Modulator
Digital
Filter
HPF
Option
MODE
CS
Power
Calculation
Engine
SDI
Serial
Interface
SDO
SCLK
INT
VREFIN
x1
Temperature
Sensor
VIN+
VIN-
x10
2nd Order
∆Σ
Modulator
Digital
Filter
HPF
Option
E-to-F
E1
E2
E3
VREFOUT
Voltage
Reference
Power
Monitor
System
Clock
/K
Clock
Generator
Calibration
AGND
PFMON
XIN
XOUT CPUCLK
DGND
Copyright
©
Cirrus Logic, Inc. 2008
(All Rights Reserved)
APR ‘08
DS661F2
CIRRUS [ CIRRUS LOGIC ]
