WMS7170 / 7171
- 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 ............................................................................................................................. 6
7. FUNCTIONAL DESCRIPTION............................................................................................................ 7
7.1. Rheostat And Divider Operations ........................................................................................... 7
7.1.1. Rheostat Configuration .......................................................................................................... 7
7.1.2. Divider Configuration.............................................................................................................. 7
7.2. Non-Volatile Memory (NVMEM0) ........................................................................................... 7
7.3. Serial Data Interface ................................................................................................................. 8
7.4. Operation Overview .................................................................................................................. 8
8. TIMING DIAGRAMS............................................................................................................................ 9
9. ABSOLUTE MAXIMUM RATINGS & OPERATING CONDITIONS .................................................. 11
10. ELECTRICAL CHARACTERISTICS ............................................................................................... 12
10.1 Test Circuits ............................................................................................................................ 14
11. TYPICAL APPLICATION CIRCUITS............................................................................................... 15
11.1. Layout Considerations.......................................................................................................... 17
12. PACKAGE DRAWINGS AND DIMENSIONS.................................................................................. 18
13. ORDERING INFORMATION........................................................................................................... 21
14. VERSION HISTORY ....................................................................................................................... 22
WMS7170 / 7171
Publication Release Date: July 2003
- 5 - Revision 1.0
5. PIN CONFIGURATION
1
V
SS
1
2
3
4
5
6
7
8
2
3
45
6
7
8
1
2
3
45
6
7
8
INC
V
DD
U/D
R
A
/V
A
CS
R
B
/V
B
R
w
/V
W
V
SS
R
w
/V
W
R
w
/V
W
8-MSOP
8-SOIC
8-PDIP
INC
U/D
R
A
/V
A
V
DD
CS
R
B
/V
B
V
SS
INC
U/D
R
A
/V
A
V
DD
CS
R
B
/V
B
WMS7170 / 7171
- 6 -
6. PIN DESCRIPTION
TABLE 1 – PIN DESCRIPTION
Pin Name Description
CS
Chip Select: When
CS is LOW, the device is enabled.
When
CS is HIGH, the part is deselected and is in
standby mode
U/D
Up/Down Control: HIGH state enables the wiper to
move towards the R
A
/ V
A
terminal, while LOW state
implies the wiper moves towards the R
B
/ V
B
terminal
INC
Increment Control: When
CS is LOW, a HIGH-LOW
transition on
INC will move the wiper one increment
either up or down based on the U/
D input
R
A
/V
A
High terminal of the device
R
B
/V
B
Low terminal of the device
R
W
/V
W
Wiper Terminal: Output of the resistor array is determined
by the
INC , U/ D and CS inputs
V
SS
Ground pin, logic ground reference
V
DD
Power Supply
Notes: The terminology of high and low terminals above references to the relative
position of the terminal with respect to the wiper moving direction and not the
voltage potential of the terminal.

WMS7171100P

Mfr. #:
Manufacturer:
Description:
IC POT DGTL 100K 100TAPS 8-DIP
Lifecycle:
New from this manufacturer.
Delivery:
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