CAT5120 Datasheet, PDF (1/12 Pages) Catalyst Semiconductor – 16-Tap MiniPot Digitally Programmable Potentiometers with 2-Wire Interface

CAT5120, CAT5121, CAT5122
16-Tap MiniPot™ Digitally Programmable
Potentiometers with 2-Wire Interface
FEATURES
„ 0.3µA Ultra-low standby current
„ Single-supply operation: 2.7 V to 5.5 V
„ Glitchless switching between resistor taps
„ Power-on reset to midscale
„ 2-wire up/down serial interface
„ Resistance values: 10 kΩ, 50 kΩ and 100 kΩ
„ Available in SC-70 and SOT-23 packages
APPLICATIONS
„ LCD screen adjustment
„ Volume control
„ Mechanical potentiometer replacement
„ Gain adjustment
„ Line impedance matching
For Ordering Information details, see page 10.
DESCRIPTION
CAT5120/5121/5122 linear-taper digitally programmable
potentiometers perform the same function as a
mechanical potentiometer or a variable resistor. These
devices consist of a fixed resistor and a wiper contact
with 16-tap points that are digitally controlled through a
2-wire up/down serial interface.
The CAT5120 is configured as a potentiometer. The
CAT5121 and CAT5122 are configured as variable
resistors. See Pin Configurations for part functionality.
Three resistance values are available: 10 kΩ, 50 kΩ
and 100 kΩ. These are available in space-saving 5-pin
and 6-pin SC-70 and SOT-23 packages.
FUNCTIONAL DIAGRAM
H
V_DD
GND
CS
W
U/D
PIN CONFIGURATION
SC-70
SOT-23
SC-70
SOT-23
V_DD 1
6H
V_DD 1
5H
GND 2
5W
CAT5120
U/D 3
4 CS
GND 2
CAT5122
U/D 3
4 CS
SC-70
SOT-23
V_DD 1
6H
GND 2
5L
CAT5121
U/D 3
4 CS
L
PIN DESCRIPTIONS
Name
V_DD
GND
U/D¯
C¯¯S
L
W
H
Description
Power Supply
Ground
Up/¯D¯o¯w¯n¯ Control Input. With C¯¯S low, a
low-to-high transition increments or
decrements the wiper position.
Chip Select Input. A high-to-low C¯¯S
transition determines the mode:
increment if U/D¯ is high, or decrement if
U/D¯ is low.
Low Terminal of Resistor
Wiper Terminal of Resistor
High Terminal of Resistor
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-2121 Rev. G