WMS7140010P WINBOND [Winbond], WMS7140010P Datasheet - Page 8

• Manufacturer Part Number: WMS7140010P
• Description: NONVOLATILE DIGITAL POTENTIOMETERS WITH UP/DOWN (3-WIRE) INTERFACE, 10KOHM, 50KOHM, 100KOHM RESISTANCE 16 TAPS WITH OPTIONAL OUTPUT BUFFER
• Manufacturer: WINBOND [Winbond]

The Up/Down family has a 3-wire Serial Data Interface consisting of CS , INC , U/ D pins. Only
UP/DOWN operations can be performed. The key features of this interface include:
The wiper position or the Tap Register(TR) setting can only be changed by the UP/DOWN operation
with the combination of CS , U/ D , and INC signals. When CS is low, the part will be activated and
the TR setting can be changed by toggling INC , and TR will move up when U/ D is High and move
down when U/ D is Low. The TR setting will be stored into the user NVMEM automatically each time
will not be stored. The NVMEM content will be automatically loaded into TR at Power On. The user
NVMEM can be tested through the voltage measurement on the wiper pin after saving TR setting into
the NVMEM and reloading into the TR. When the TR setting is already at LOW, further DOWN
operations won’t change the setting. Similarly, when TR setting is at HIGH, further UP operations
won’t change the setting.
When CS is held HIGH, the part will be in Standby mode and the TR setting will not be changed.
The operating modes of Up/Down are summarized below.
Note: x means don’t care
CS goes high while INC holds high. Otherwise, if INC is low when CS goes high, the TR setting
7.3. S
•
•
•
•
7.4. O
Low to High
Low to High
Increment/Decrement operations on the tap register (TR)
Direct refresh of tap register (TR) from internal NVMEM
Nonvolatile storage of the present tap register value into the NVMEM and automatic recall at
power up
For WMS7141 devices, output buffer amplifier
High
Low
Low
ERIAL
PERATION
CS
D
ATA
O
I
VERVIEW
NTERFACE
High
U/ D
Low
x
x
x
High to Low
High to Low
- 8 -
High
INC
Low
x
No Store, Return to Standby
Store Wiper Position
Wiper toward V
Wiper toward V
Operation
Standby
WMS7140/1
A
B