Cirrus Logic CS5460A, Руководство пользователя

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CS5460A
2 DS284PP4
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 5
ANALOG CHARACTERISTICS ................................................................................................ 5
VREFOUT REFERENCE OUTPUT VOLTAGE........................................................................ 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 ............................................................................... 13
2.1.4 Digital High-Pass Filters ...................................................................................... 13
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) ......................................................................... 16
2.2.3 Continuous Computation Cycles (C=1) ............................................................... 16
2.3 Basic Application Circuit Configurations .......................................................................... 17
3. SERIAL PORT OVERVIEW .................................................................................................... 18
3.1 Commands (Write Only) .................................................................................................. 20
3.2 Serial Port Interface ......................................................................................................... 23
3.3 Serial Read and Write ...................................................................................................... 23
3.3.1 Register Write ..................................................................................................... 23
3.3.2 Register Read ..................................................................................................... 23
3.4 System Initialization ......................................................................................................... 24
3.5 Serial Port Initialization .................................................................................................... 24
3.6 CS5460A Power States ................................................................................................... 25
4. FUNCTIONAL DESCRIPTION ............................................................................................... 26
4.1 Pulse-Rate Output ........................................................................................................... 26
4.2 Pulse Output for Normal, Stepper Motor and Mechanical Counter Format ..................... 28
4.2.1 Normal Format .................................................................................................... 28
4.2.2 Mechanical Counter Format ................................................................................ 29
4.2.3 Stepper Motor Format ......................................................................................... 29
4.3 Auto-Boot Mode Using EEPROM .................................................................................... 30
4.3.1 Auto-Boot Configuration ...................................................................................... 30
4.3.2 Auto-Boot Data for EEPROM .............................................................................. 30
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