CAT5111
PIN CONFIGURATION
PIN DESCRIPTIONS
PDIP 8-Lead (L)
SOIC 8 Lead (V)
MSOP 8 Lead (Z)
Name Function
¯¯¯
INC
Increment Control
Up/Down Control
TSSOP 8 Lead (Y)
¯
U/D
¯¯¯
¯¯
CS
1
8 VCC
¯¯
1
8 RL
INC
RH Potentiometer High Terminal
GND Ground
32 CAT 7 RWB
¯
U/D
VCC
2 CAT 7
CS
¯¯¯
INC
6 GND
RH
3
6 RL
RWB Buffered Wiper Terminal
RL Potentiometer Low Terminal
GND 4
5 RWB
¯
U/D
4
5 RH
¯¯
CS
Chip Select
VCC Supply Voltage
PIN DESCRIPTION
¯¯¯
¯
¯¯¯
high state, activity on the INC and U/D inputs will not
affect or change the position of the wiper.
INC: Increment Control Input
¯¯¯
The INC input (on the falling edge) moves the wiper in
the up or down direction determined by the condition
of the U/D input.
DEVICE OPERATION
¯
The CAT5111 operates like a digitally controlled
potentiometer with RH and RL equivalent to the high
and low terminals and RWB equivalent to the mecha–
nical potentiometer's wiper. There are 100 available
tap positions including the resistor end points, RH and
RL. There are 99 resistor elements connected in
series between the RH and RL terminals. The wiper
terminal is connected to one of the 100 taps and
¯
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.
¯¯¯
¯
¯¯
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 nonvolatile
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.
¯¯
memory using the INC and CS inputs.
¯¯
With CS set LOW the CAT5111 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
RWB: Wiper Potentiometer Terminal (Buffered)
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
RWB is the buffered wiper terminal of the poten–
tiometer. Its position on the resistor array is controlled
¯¯¯
¯
¯¯
by the control inputs, INC, U/D and CS.
¯¯
counter is stored in nonvolatile memory whenever CS
¯¯¯
transitions HIGH while the INC input is also HIGH.
RL: Low End Potentiometer Terminal
When the CAT5111 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.
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 electri-
cally interchangeable.
¯¯¯
With INC set low, the CAT5111 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.
¯¯
CS: Chip Select
The chip select input is used to activate the control
input of the CAT5111 and is active low. When in a
Doc. No. MD-2008 Rev. P
2
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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