DS4301
Nonvolatile, 32-Position Digital Potentiometer
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cycled to the device, the wiper setting that was just
stored is the setting loaded on power-up.
Wiper storage does not have to occur immediately after
a change in wiper position. At anytime the current wiper
position can be stored to the EEPROM by simply issuing a low pulse to the CS pin for t
CLP
while the INC pin
remains in a high state. The wiper does not move during this action and the current wiper setting is stored in
EEPROM after t
WST
.
For applications that require a specific wiper setting to
be loaded on power-up and never changed, write the
desired wiper setting to the EEPROM, then tie CS to
VCC. Every time power is cycled to the DS4301, the
desired wiper setting is loaded from EEPROM, and
since CS is tied to VCC, no changes can be made to
the wiper setting.
EEPROM Characteristics
There is a limit to the number of times the EEPROM can
be written to before a wear-out occurs (see the
Nonvolatile Memory Characteristics table). After EEPROM wear-out occurs, the wiper can still be adjusted,
however accurately storing the wiper position is no
longer possible. When power is removed from the part,
the current wiper position is lost. Upon power-up, the
wiper setting stored in EEPROM is loaded within t
WLT
of
V
CC
reaching a stable voltage level greater than or
equal to V
CC MIN
. If EEPROM wear-out has occurred,
the wiper setting that is loaded is unknown.
Application Information
To achieve the best results when using the DS4301,
decouple the power supply with a 0.01µF or 0.1µF
capacitor. Use a high-quality ceramic surface-mount
capacitor when possible. Surface-mount components
minimize lead inductance, improving performace.
Ceramic capacitors tend to have adequate highfrequency response for decoupling applications.
Chip Information
TRANSISTOR COUNT: 3512
SUBSTRATE INFO: P-substrate
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo
.