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Cirrus Logic

CS5466 Datasheet Preview

CS5466 Datasheet

Low-cost Power/Energy

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CS5466
Low-cost Power/Energy IC with Pulse Output
Features
Description
Single-chip Power Measurement Solution
Energy Data Linearity:
±0.1% of Reading, over 1000:1 Dynamic Range
On-chip functions: Measures Power and
Performs Energy-to-pulse Conversions
Meets Accuracy Spec for IEC, ANSI, & JIS.
High-pass Filter Option
Four Input Ranges for Current Channel
On-chip, 2.5 V Reference
Pulse Outputs for Stepper Motor or
Mechanical Counter
On-chip Energy Direction Indicator
Ground-referenced Input Signals with Single
Supply
High-frequency Output for Calibration
On-chip, Power-on Reset (POR)
Power Supply Configurations:
VA+ = +5 V; AGND = 0 V; VD+ = +3.3 V to 5 V
I
The CS5466 is a low-cost power meter solution incorpo-
rating dual delta-sigma (analog-to-digital converters
ADCs), an energy-to-frequency converter, and energy
pulse outputs on a single chip. The CS5466 is designed
to accurately measure and calculate energy for single
phase, 2- or 3-wire power metering applications with
minimal external components.
The low-frequency pulse outputs, E1 and E2, provide
pulses at a frequency which is proprtional to the active
power and can be used to drive a stepper motor or a me-
chanical counter. Energy direction output, NEG,
indicates when pulse outputs E1 and E2 represent neg-
ative active power. The high-frequency pulse output
FOUT is designed to assist in system calibration.
The CS5466 has configuration pins which allow for direct
configuration of pulse output frequency, current channel
input range, and high-pass filter enable option.
The CS5466 also has a power-on reset function which
holds the part in reset until the supply reaches an oper-
able level.
ORDERING INFORMATION
See page 16.
VA+ RESET VD+
IIN+
IIN-
PGA
4th Order 
Modulator
Digital
Filter
HPF
Option
VREFIN
x1
VIN+
VIN-
VREFOUT
x10
2nd Order 
Modulator
Digital
Filter
2.5V On-Chip
Reference
AGND
HPF
Option
Energy-to-
Frequency
Conversion
Config
Clock
Generator
DGND
FOUT
E1
E2
NEG
HPF
FREQ0
FREQ1
FREQ2
IGAIN0
IGAIN1
CPUCLK
XOUT
XIN
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2011
(All Rights Reserved)
APR ‘11
DS659F2




Cirrus Logic

CS5466 Datasheet Preview

CS5466 Datasheet

Low-cost Power/Energy

No Preview Available !

CS5466
TABLE OF CONTENTS
1. OVERVIEW ............................................................................................................................... 3
2. PIN DESCRIPTION ................................................................................................................... 4
3. CHARACTERISTICS & SPECIFICATIONS ............................................................................. 5
RECOMMENDED OPERATING CONDITIONS ....................................................................... 5
ANALOG CHARACTERISTICS ................................................................................................ 5
VOLTAGE REFERENCE ......................................................................................................... 6
DIGITAL CHARACTERISTICS ................................................................................................. 7
SWITCHING CHARACTERISTICS .......................................................................................... 8
ABSOLUTE MAXIMUM RATINGS ........................................................................................... 9
4. THEORY OF OPERATION ..................................................................................................... 10
4.1 Digital Filters .................................................................................................................... 10
4.2 Active Power Computation ............................................................................................... 10
5. FUNCTIONAL DESCRIPTION ............................................................................................... 11
5.1 Analog Inputs ................................................................................................................... 11
5.1.1 Voltage Channel .................................................................................................. 11
5.1.2 Current Channel .................................................................................................. 11
5.2 High-pass Filter ................................................................................................................ 11
5.3 Energy Pulse Outputs ...................................................................................................... 11
5.3.1 Pulse Output Format. .......................................................................................... 11
5.3.2 Selecting Frequency of E1 and E2 ...................................................................... 11
5.3.3 Selecting Frequency of FOUT ............................................................................. 12
5.3.4 Absolute Max Frequency on E1 and E2 .............................................................. 12
5.3.5 E1 and E2 Frequency Calculation ....................................................................... 13
5.4 Energy Direction Indicator ............................................................................................... 13
5.5 Power-on Reset ............................................................................................................... 13
5.6 Oscillator Characteristics ................................................................................................. 13
5.7 Basic Application Circuit .................................................................................................. 14
6. PACKAGE DIMENSIONS ....................................................................................................... 15
7. REVISION HISTORY .............................................................................................................. 16
LIST OF FIGURES
Figure 1. Timing Diagram for E1, E2 and FOUT (Not to Scale) ...................................................... 8
Figure 2. Data Flow ....................................................................................................................... 10
Figure 3. Oscillator Connection ..................................................................................................... 13
Figure 4. Typical Connection Diagram .......................................................................................... 14
LIST OF TABLES
Table 1. Current Channel PGA Setting ......................................................................................... 11
Table 2. Maximum Frequency for E1, E2, and FOUT ................................................................... 12
Table 3. Absolute Max Frequency on E1 and E2.......................................................................... 12
2 DS659F2


Part Number CS5466
Description Low-cost Power/Energy
Maker Cirrus Logic
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CS5466 Datasheet PDF






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