wms7110 ETC-unknow, wms7110 Datasheet - Page 8

• Manufacturer Part Number: wms7110
• Description: Nonvolatile Digital Potentiometers With Up/down 3-wire Interface, 10kohm, 50kohm, 100kohm Resistance
• Manufacturer: ETC-unknow

The Up/Down family has a 3-wire Serial Data Interface consisting of
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
the TR setting can be changed by toggling
down when U/
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
The operating modes of Up/Down are summarized below.
Note: x means don’t care
CS
7.3. S
•
•
•
•
7.4. O
Low to High
Low to High
goes high while
CS
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 WMS7111 devices, output buffer amplifier
High
Low
Low
ERIAL
PERATION
CS
is held HIGH, the part will be in Standby mode and the TR setting will not be changed.
D
D
ATA
is Low. The TR setting will be stored into the user NVMEM automatically each time
O
I
VERVIEW
NTERFACE
INC
CS
holds high. Otherwise, if
, U/
High
U/
Low
D
x
x
x
D
, and
INC
INC
signals. When
High to Low
High to Low
- 8 -
, and TR will move up when U/
High
INC
Low
x
INC
is low when
CS
is low, the part will be activated and
No Store, Return to Standby
Store Wiper Position
CS
Wiper toward V
Wiper toward V
CS
Operation
goes high, the TR setting
,
Standby
INC
WMS7110/1
D
is High and move
, U/
D
A
B
B
pins. Only