cat5133 Catalyst Semiconductor, cat5133 Datasheet - Page 2

• Manufacturer Part Number: cat5133
• Description: 16 Volt Digitally Programmable Potentiometer Dpp? With 128 Taps And An Increment Decrement Interface
• Manufacturer: Catalyst Semiconductor

CAT5133
PIN CONFIGURATION
DEVICE OPERATION
The CAT5133 operates like a digitally controlled
potentiometer with R
and low terminals and R
potentiometer’s wiper. There are 128 available tap
positions including the resistor end points, R
There are 127 resistor elements connected in series
between the R
connected to one of the 128 taps and controlled by
three inputs, INC
7-bit up/down counter whose output is decoded to
select the wiper position. The selected wiper position
can be stored in nonvolatile memory using the INC
¯¯¯ inputs.
With CS
respond to the U/D ¯ and INC
transitions on INC
OPERATION MODES
Doc. No. MD-2125 Rev. C
CS
High to Low
High to Low
MSOP Package (GZ)
¯¯¯ set LOW the CAT5133 is selected and will
High
Low
¯¯¯
INC
X
¯¯¯, U/D ¯ and CS
H
¯¯¯ will increment or decrement the
and R
Low to High
Low to High
High
H
Low
Low
¯¯¯
CS
L
and R
terminals. The wiper terminal is
W
equivalent to the mechanical
¯¯¯ inputs. HIGH to LOW
¯¯¯. These inputs control a
L
equivalent to the high
High
Low
U/D ¯
X
X
X
PIN DESCRIPTIONS
Pin
10
1
2
3
4
5
6
7
8
9
No Store, Return to Standby
H
Store Wiper Position
Name
GND
¯¯¯ and
U/D ¯
N/C
¯¯¯
INC
V
¯¯¯
and R
CS
R
R
R
V
Wiper toward H
Wiper toward L
CC
W
H
+
L
Operation
Standby
L
.
Function
Up/Down Data Input – Determines the direction of
movement of the wiper
Ground
Logic Supply Voltage (2.7V to 5.5V)
Chip Select – The chip is selected when the input is low.
No Connect
High Reference Terminal for the Potentiometer
Wiper Terminal for the Potentiometer
Low Reference Terminal for the Potentiometer
Analog Bias Voltage Input (+8.0V to +16.0V)
Increment Input – Moves the wiper in the direction
determined by the Up/Down input on each negative edge
2
wiper (depending on the state of the U/D ¯ input and
7-bit counter). The wiper, when at either fixed terminal,
acts like its mechanical equivalent and does not move
beyond the last position. The value of the counter is
stored in nonvolatile memory whenever CS
HIGH while the INC
CAT5133 is powered-down; the last stored wiper
counter position is maintained in the nonvolatile
memory. When power is restored, the contents of the
memory are recalled and the counter is set to the
value stored.
With INC
and powered down without storing the current wiper
position in nonvolatile memory. This allows the system
to always power up to a preset value stored in
nonvolatile memory.
¯¯¯ set low, the CAT5133 may be de-selected
¯¯¯ input is also HIGH. When the
Characteristics subject to change without notice
© Catalyst Semiconductor, Inc.
¯¯¯ transitions