CS5460

2

DS279PP5

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 .............................................................................. 10

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 ........................................................................................ 14

3.1 Command Word (Write Only) .......................................................................... 15

3.1.1 Start Conversions

............................................................................... 15

3.1.2 SYNC0 Command

.............................................................................. 15

3.1.3 SYNC1 Command

............................................................................. 15

3.1.4 Power-up/Halt Control

........................................................................ 15

3.1.5 Power-down Control ............................................................................. 16

3.1.6 Calibration Control

............................................................................ 16

3.1.7 Register Read/Write Command

......................................................... 17

3.2 Serial Port Interface ......................................................................................... 18

3.3 Serial Port Initialization .................................................................................... 18

3.4 System Initialization ......................................................................................... 20

4. REGISTER DESCRIPTION ........................................................................................ 21

4.1 Configuration Register .................................................................................... 21

4.2 Current Offset Register and Voltage Offset Register ...................................... 22

4.3 Current Gain Register and Voltage Gain Register .......................................... 22

4.4 Cycle Count Register ...................................................................................... 23

4.5 Pulse-Rate Register ........................................................................................ 23

4.6 I,V,P,E Signed Output Register Results ......................................................... 23

4.7 IRMS, VRMS Unsigned Output Register Results ........................................... 23

4.8 Timebase Calibration ...................................................................................... 24

4.9 Status Register and Mask Register ................................................................ 24

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.