wms7201 Winbond Electronics Corp America, wms7201 Datasheet - Page 4

• Manufacturer Part Number: wms7201
• Description: 256-tap Non-volatile Digital Potentiometer
• Manufacturer: Winbond Electronics Corp America

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
8. TIMING DIAGRAMS.......................................................................................................................... 16
9. ABSOLUTE MAXIMUM RATINGS.................................................................................................... 18
10. ELECTRICAL CHARACTERISTICS ............................................................................................... 19
11. TYPICAL APPLICATION CIRCUIT ................................................................................................. 22
12. PACKAGE DRAWINGS AND DEMINSIONS.................................................................................. 25
13. ORDERING INFORMATION........................................................................................................... 28
14. VERSION HISTORY ....................................................................................................................... 29
7.1. Potentiometer and Rheostat Modes ............................................................................................. 7
7.2. Programming Modes .................................................................................................................... 7
7.3. Non-Volatile Memory (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
10.1 Test Circuits............................................................................................................................... 21
11.1. Layout Considerations .............................................................................................................. 24
7.1.1. Rheostat Configuration .......................................................................................................... 7
7.1.2. Potentiometer Configuration .................................................................................................. 7
7.3.1 Write Protect of NVMEM ......................................................................................................... 8
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
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WMS7201