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WMS7170010M Datasheet(PDF) 8 Page - Winbond

Part # WMS7170010M
Description  NON-VOLATILE DIGITAL POTENTIOMETERS WITH UP/DOWN (3-WIRE) INTERFACE, 10KOHM, 50KOHM, 100KOHM RESISTANCE 100 TAPS WITHOUT / WITH OUTPUT BUFFER
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

WMS7170010M Datasheet(HTML) 8 Page - Winbond

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WMS7170 / 7171
- 8 -
7.3. SERIAL DATA INTERFACE
The WMS7170/7171 device has a 3-wire Up/Down Serial Interface consisting of CS , INC and U/ D
control signals. The key features of this interface include:
Enabling the device
Determining the moving direction of the wiper
Increment/Decrement operation on the wiper
Non-volatile storage of the present wiper position into the NVMEM0 for automatic recall at
power up
Entering into the standby mode
7.4. OPERATION OVERVIEW
The wiper position can be changed either up or down by operating the CS , U/ D and INC control
signals.
When CS is LOW, the device is selected and the wiper can be moved by toggling the INC . As a
result, the wiper moves up when U/ D is HIGH and moves down when U/ D is LOW. The status of the
U/ D can be changed even though the CS remains LOW. This allows the system to enable the
device and then move the wiper position either up or down until the desired position is reached.
When the wiper is already at the lowest position, further Down operation won’t change the wiper
position. Similarly, when the wiper is at the highest position, further Up operation won’t change the
wiper position too.
The current wiper position can be automatically stored into the NVMEM0 each time the CS goes
from LOW to HIGH while the INC remains HIGH. Adversely, if the INC is LOW when the CS goes
HIGH, the wiper position cannot be stored. Meanwhile, the NVMEM0 content is automatically loaded
into the wiper during power on.
When the CS is held HIGH, the device enters into Standby mode and the wiper position cannot be
changed. Changing the CS to LOW exits the Standby mode and enables the device again.
The operating modes of Up/Down interface are summarized in the table below:
CS
U/ D
INC
Operation
LOW
HIGH
HIGH to LOW
Move Wiper toward RA /VA
LOW
LOW
HIGH to LOW
Move Wiper toward RB /VB
LOW to HIGH
x
HIGH
Store Current Wiper Position
LOW to HIGH
x
LOW
No Store, Return to Standby
HIGH
x
x
Standby
Note: x means don’t care


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