WMS7204

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4. TABLE OF CONTENTS

1. GENERAL DESCRIPTION.................................................................................................................. 2

2. FEATURES ......................................................................................................................................... 2

3. BLOCK DIAGRAM .............................................................................................................................. 3

4. TABLE OF CONTENTS ...................................................................................................................... 4

5. PIN CONFIGURATION ....................................................................................................................... 5

6. PIN DESCRIPTION............................................................................................................................. 6

7. FUNCTIONAL DESCRIPTION............................................................................................................ 8

7.1. Potentiometer and Rheostat Modes ............................................................................................. 8

7.1.1. Rheostat Configuration .......................................................................................................... 8

7.1.2. Potentiometer Configuration .................................................................................................. 8

7.2. Programming Modes .................................................................................................................... 8

7.3. Non-Volatile Memory (NVMEM) ................................................................................................... 9

7.3.1 Write Protect of NVMEM ......................................................................................................... 9

7.4 Flow Control................................................................................................................................... 9

7.5. Daisy Chain ................................................................................................................................ 10

7.6. Serial Data Interface ................................................................................................................... 11

7.7. Instruction Set............................................................................................................................. 12

7.8. Basic Operation .......................................................................................................................... 13

7.8.1 Sending a Command ............................................................................................................ 14

7.8.2 Wake Up/Sleep/Power Commands ...................................................................................... 14

7.8.3 Write to Tap Register (TR).................................................................................................... 14

7.8.4 Programming Non-Volatile Memory (NVMEM)..................................................................... 16

7.8.5 Reading Tap Registers and NVMEM Locations ................................................................... 17

8. TIMING DIAGRAMS.......................................................................................................................... 18

9. ABSOLUTE MAXIMUM RATINGS.................................................................................................... 20

10. ELECTRICAL CHARACTERISTICS ............................................................................................... 21

10.1 Test Circuits............................................................................................................................... 23

11. TYPICAL APPLICATION CIRCUIT.................................................................................................24

11.1. Layout Considerations.............................................................................................................. 27

12. PACKAGE DRAWINGS AND DIMENSIONS.................................................................................. 28

13. ORDERING INFORMATION........................................................................................................... 31

14. VERSION HISTORY ....................................................................................................................... 32