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CS5460 Datasheet Preview

CS5460 Datasheet

Single Phase Bi-directional Power/energy

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CS5460
Single Phase Bi-Directional Power/Energy IC
Features
l Energy Data Linearity: 0.1% of Reading over
1000:1 Dynamic Range
l On-Chip Functions: Energy, I V,
IRMS and VRMS, Energy to Pulse-Rate
Conversion
l Complies with IEC 687/1036, JIS
l Power Consumption <12 mW
l Interface Optimized for Shunt Sensor
l Phase Compensation
l Ground-Referenced Signals with Single
Supply
l System Calibration
l On-chip 2.5 V Reference (60 ppm/°C drift)
l Simple Three-wire Serial Interface
l Watch Dog Timer
l Power Supply Monitor
l Power Supply Configurations
- VA+ = +5 V; VA- = 0V; VD+ = +3 V to +5 V
- VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V
Description
The CS5460 is a highly integrated ∆Σ Analog-to-Digital
Converter (ADC) which combines two ∆Σ ADCs, high
speed power calculation functions, and a serial interface
on a single chip. It is designed to accurately measure
and calculate: Energy, Instantaneous Power, IRMS, and
VRMS for single phase 2 or 3-wire power meter applica-
tions. The CS5460 interfaces to a low cost shunt or
transformer to measure current, and resistive divider or
transformer to measure voltage. The CS5460 features a
bi-directional serial interface for communication with a
micro-controller and a fixed-width programmable fre-
quency output that is proportional to energy. The product
is initialized and fully functional upon power-up, and in-
cludes facilities for system-level calibration under control
of the user program.
ORDERING INFORMATION:
CS5460-BS -40°C to +85°C
24-pin SSOP
VA+
RESET
VD+
IIN+ PGA
IIN- x10,x50
4th Order
∆Σ
Modulator
VIN+
VIN-
VREFIN
VREFOUT
x10 2nd Order
∆Σ
Modulator
x1
Voltage
Reference
Power
Monitor
Digital
Filter
Digital
Filter
System
Clock
/K
High Pass
Filter
Power
Calculation
Engine
(Energy
I*V
IRMS ,VRMS )
High Pass
Filter
Clock
Generator
Watch Dog
Timer
Serial
Interface
E-to-F
Calibration
SRAM
CS
SDI
SDO
SCLK
INT
EDIR
EOUT
VA- PFMON
XIN XOUT CPUCLK
DGND
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2000
(All Rights Reserved)
JUL ‘00
DS279PP6
1




Cirrus Logic

CS5460 Datasheet Preview

CS5460 Datasheet

Single Phase Bi-directional Power/energy

No Preview Available !

www.DataSheet4U.com
CS5460
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ............................................................ 4
ANALOG CHARACTERISTICS ............................................................................... 4
5 V DIGITAL CHARACTERISTICS ......................................................................... 5
3 V DIGITAL CHARACTERISTICS ......................................................................... 6
ABSOLUTE MAXIMUM RATINGS .......................................................................... 6
SWITCHING CHARACTERISTICS ......................................................................... 7
2. GENERAL DESCRIPTION ........................................................................................... 9
2.1 Theory of Operation........................................................................................... 9
2.2 Performing Measurements ................................................................................ 9
2.2.1 Single Computation Cycle (C = 0).......................................................... 11
2.2.2 Multiple Computation Cycles (C = 1)...................................................... 11
2.3 High Rate Digital Filters ................................................................................... 11
2.4 Pulse-Rate Output ........................................................................................... 12
3. SERIAL PORT OVERVIEW ........................................................................................ 15
3.1 Command Word (Write Only) .......................................................................... 16
3.1.1 Start Conversions................................................................................... 16
3.1.2 SYNC0 Command.................................................................................. 16
3.1.3 SYNC1 Command.................................................................................. 16
3.1.4 Power-up/Halt Control............................................................................ 16
3.1.5 Power-down Control............................................................................... 17
3.1.6 Calibration Control ................................................................................. 17
3.1.7 Register Read/Write Command ............................................................. 18
3.2 Serial Port Interface ......................................................................................... 19
3.3 Serial Port Initialization .................................................................................... 19
3.4 System Initialization ......................................................................................... 21
4. REGISTER DESCRIPTION ........................................................................................ 22
4.1 Configuration Register .................................................................................... 22
4.2 Current Offset Register and Voltage Offset Register ...................................... 23
4.3 Current Gain Register and Voltage Gain Register .......................................... 24
4.4 Cycle Count Register ...................................................................................... 24
4.5 Pulse-Rate Register ........................................................................................ 24
4.6 I,V,P,E Signed Output Register Results ......................................................... 24
4.7 IRMS, VRMS Unsigned Output Register Results ........................................... 25
4.8 Timebase Calibration ...................................................................................... 25
4.9 Status Register and Mask Register ................................................................ 25
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts/
Microwire is a trademark of National Semiconductor Corporation.
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product infor-
mation describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the information
contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of
any kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights
of third parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of
this publication may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or
otherwise) without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no
part of the printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical,
photographic, or otherwise) without the prior written consent of Cirrus Logic, Inc. Furthermore, no part of this publication may be used as a basis for manufacture
or sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing
in this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trade-
marks and service marks can be found at http://www.cirrus.com.
2 DS279PP6


Part Number CS5460
Description Single Phase Bi-directional Power/energy
Maker Cirrus Logic
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