WMS7201

- 4 -

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............................................................................................................................. 5

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

7.1. Potentiometer and Rheostat Modes ............................................................................................. 7

7.1.1. Rheostat Configuration .......................................................................................................... 7

7.1.2. Potentiometer Configuration .................................................................................................. 7

7.2. Programming Modes .................................................................................................................... 7

7.3. Non-Volatile Memory (NVMEM) ................................................................................................... 8

7.3.1 Write Protect of NVMEM ......................................................................................................... 8

7.4 Flow Control................................................................................................................................... 8

7.5. Daisy Chain .................................................................................................................................. 9

7.6. Serial Data Iterface ..................................................................................................................... 10

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

7.8. Basic Operation .......................................................................................................................... 12

7.8.1 Sending a Command ............................................................................................................ 12

7.8.2 Wake Up/Sleep/Power Commands ...................................................................................... 13

7.8.3 Write to Tap Register (TR).................................................................................................... 13

7.8.4 Programming Non-Volatile Memory (NVMEM)..................................................................... 14

7.8.5 Reading Tap Register and NVMEM Location (10-pin TSSOP package only)...................... 15

8. TIMING DIAGRAMS.......................................................................................................................... 16

9. ABSOLUTE MAXIMUM RATINGS.................................................................................................... 18

10. ELECTRICAL CHARACTERISTICS ............................................................................................... 19

10.1 Test Circuits............................................................................................................................... 21

11. TYPICAL APPLICATION CIRCUIT.................................................................................................22

11.1. Layout Considerations.............................................................................................................. 24

12. PACKAGE DRAWINGS AND DEMINSIONS.................................................................................. 25

13. ORDERING INFORMATION........................................................................................................... 28

14. VERSION HISTORY ....................................................................................................................... 29