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CAT5114 Datasheet(PDF) 2 Page - Catalyst Semiconductor

Part # CAT5114
Description  32-Tap Digitally Programmable Potentiometer (DPP??
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5114 Datasheet(HTML) 2 Page - Catalyst Semiconductor

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CAT5114
Doc. No. MD-2007 Rev. O
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
PIN CONFIGURATION
PDIP 8-Lead (L), SOIC 8-Lead (V),
MSOP 8-Lead (Z)
INC
¯¯¯ 1
8 VCC
U/D
¯
2
7 CS
¯¯
RH 3
6 RL
GND 4
5 RWB
CAT
TSSOP 8-Lead (Y)
CS
¯¯
1
8 RL
VCC 2
7 RWB
INC
¯¯¯ 3
6 GND
U/D
¯
4
5 RH
CAT
TDFN 8-Pad
(ZD7, VP2) Top View
INC
¯¯¯ 1
8 VCC
U/D
¯ 2
7 CS
¯¯
RH 3
6 RL
GND 4
5 RWB
PIN DESCRIPTIONS
Name Function
INC
¯¯¯
Increment Control
U/D
¯
Up/Down Control
RH
Potentiometer High Terminal
GND Ground
RW
Buffered Wiper Terminal
RL
Potentiometer Low Terminal
CS
¯¯
Chip Select
VCC Supply Voltage
PIN FUNCTION
INC
¯¯¯: Increment Control Input
The INC
¯¯¯ input moves the wiper in the up or down
direction determined by the condition of the U/D
¯ input.
U/D
¯: Up/Down Control Input
The U/D
¯ input controls the direction of the wiper
movement. When in a high state and CS
¯¯ is low, any
high-to-low transition on INC
¯¯¯ will cause the wiper to
move one increment toward the RH terminal. When in
a low state and CS
¯¯ is low, any high-to-low transition
on INC
¯¯¯ will cause the wiper to move one increment
towards the RL terminal.
RH: High End Potentiometer Terminal
RH is the high end terminal of the potentiometer. It is
not required that this terminal be connected to a
potential greater than the RL terminal. Voltage applied
to the RH terminal cannot exceed the supply voltage,
VCC or go below ground, GND.
RW: Wiper Potentiometer Terminal
RW is the wiper terminal of the potentiometer. Its
position on the resistor array is controlled by the
control inputs, INC
¯¯¯, U/D
¯ and CS
¯¯ . Voltage applied to
the RW terminal cannot exceed the supply voltage,
VCC or go below ground, GND.
RL: Low End Potentiometer Terminal
RL is the low end terminal of the potentiometer. It is not
required that this terminal be connected to a potential less
than the RH terminal. Voltage applied to the RL terminal
cannot exceed the supply voltage, VCC or go below
ground, GND. RL and RH are electrically interchangeable.
CS
¯¯ : Chip Select
The chip select input is used to activate the control
input of the CAT5114 and is active low. When in a
high state, activity on the INC
¯¯¯ and U/D
¯ inputs will not
affect or change the position of the wiper.
DEVICE OPERATION
The CAT5114 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high
and low terminals and RW equivalent to the mecha–
nical potentiometer's wiper. There are 32 available tap
positions including the resistor end points, RH and RL.
There are 31 resistor elements connected in series
between the RH and RL terminals. The wiper terminal
is connected to one of the 32 taps and controlled by
three inputs, INC
¯¯¯, U/D
¯ and CS
¯¯ . These inputs control a
seven-bit up/down counter whose output is decoded
to select the wiper position. The selected wiper
position can be stored in non-volatile memory using
the INC
¯¯¯ and CS
¯¯ inputs.
With CS
¯¯ set LOW the CAT5114 is selected and will
respond to the U/D
¯ and INC
¯¯¯ inputs. HIGH to LOW
transitions on INC
¯¯¯ wil increment or decrement the wiper
(depending on the state of the U/D
¯ input and seven-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
¯¯ transitions
HIGH while the INC
¯¯¯ input is also HIGH. When the
CAT5114 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
¯¯¯ set low, the CAT5114 may be de-selected
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 non-
volatile memory.


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