CS5460A datasheet(2/54 Pages) CIRRUS

2 / 54 page

CS5460A

TABLE OF CONTENTS

1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 5

ANALOG CHARACTERISTICS ................................................................................................ 5

VREFOUT REFERENCE OUTPUT VOLTAGE........................................................................ 7

5V DIGITAL CHARACTERISTICS............................................................................................ 7

3.3 V DIGITAL CHARACTERISTICS........................................................................................ 8

ABSOLUTE MAXIMUM RATINGS ........................................................................................... 8

SWITCHING CHARACTERISTICS .......................................................................................... 9

2. GENERAL DESCRIPTION ..................................................................................................... 12

2.1 Theory of Operation ......................................................................................................... 12

2.1.1 DS Modulators ................................................................................................... 12

2.1.2 High-Rate Digital Low-Pass Filters ..................................................................... 12

2.1.3 Digital Compensation Filters ............................................................................... 12

2.1.4 Digital High-Pass Filters ...................................................................................... 12

2.1.5 Overall Filter Response ....................................................................................... 13

2.1.6 Gain and DC Offset Adjustment .......................................................................... 13

2.1.7 Real Energy and RMS Computations ................................................................. 13

2.2 Performing Measurements ............................................................................................... 13

2.2.1 CS5460A Linearity Performance ......................................................................... 15

2.2.2 Single Computation Cycle (C=0) ......................................................................... 15

2.2.3 Continuous Computation Cycles (C=1) ............................................................... 16

2.3 Basic Application Circuit Configurations .......................................................................... 16

3. FUNCTIONAL DESCRIPTION ............................................................................................... 21

3.1 Pulse-Rate Output ........................................................................................................... 21

3.2 Pulse Output for Normal Format, Stepper Motor Format and Mechanical Counter Format 22

3.2.1 Normal Format .................................................................................................... 22

3.2.2 Mechanical Counter Format ................................................................................ 23

3.2.3 Stepper Motor Format ......................................................................................... 23

3.3 Auto-Boot Mode Using EEPROM .................................................................................... 24

3.3.1 Auto-Boot Configuration ...................................................................................... 24

3.3.2 Auto-Boot Data for EEPROM .............................................................................. 25

3.3.3 Application Note AN225 ...................................................................................... 26

3.4 Interrupt and Watchdog Timer ......................................................................................... 26

3.4.1 Interrupt ............................................................................................................... 26

3.4.1.1 Clearing the Status Register ............................................................... 26

3.4.1.2 Typical use of the INT pin ................................................................... 26

3.4.1.3 INT Active State .................................................................................. 26

3.4.1.4 Exceptions ........................................................................................... 26

3.4.2 Watch Dog Timer ................................................................................................ 26

3.5 Oscillator Characteristics .................................................................................................27

3.6 Analog Inputs ................................................................................................................... 27

3.7 Voltage Reference ........................................................................................................... 27

3.8 Calibration ........................................................................................................................ 27

3.8.1 Overview of Calibration Process ......................................................................... 27

3.8.2 The Calibration Registers .................................................................................... 28

3.8.3 Calibration Sequence .......................................................................................... 28

3.8.4 Calibration Signal Input Level ............................................................................. 29

3.8.5 Calibration Signal Frequency .............................................................................. 29

3.8.6 Input Configurations for Calibrations ................................................................... 29

3.8.7 Description of Calibration Algorithms .................................................................. 30

3.8.7.1 AC Offset Calibration Sequence ......................................................... 30

3.8.7.2 DC Offset Calibration Sequence ......................................................... 31

3.8.7.3 AC Gain Calibration Sequence ........................................................... 31

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