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CAT5110SDI-00GT3 Datasheet(PDF) 5 Page - Catalyst Semiconductor

No. de pieza CAT5110SDI-00GT3
Descripción Electrónicos  32-Tap MiniPot??Digitally Programmable Potentiometers with 2-Wire Interface
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5110SDI-00GT3 Datasheet(HTML) 5 Page - Catalyst Semiconductor

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CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
© Catalyst Semiconductor, Inc.
5
Doc. No. MD-2120 Rev. J
Characteristics subject to change without notice
FUNCTIONAL DESCRIPTION
The CAT5110/5118/5119/5123/5124/5125 consist of a
fixed resistor and a wiper contact with 32-tap points
that are digitally controlled through a 2-wire up/down
serial interface. Three end-to-end resistance values
are available: 10kΩ, 50kΩ and 100kΩ.
The CAT5110/5125 is designed to operate as a
potentiometer. In this configuration, the low terminal of
the resistor array is connected to ground (pin 2).
The CAT5118/5123 performs as a variable resistor. In
this device, the wiper terminal and high terminal of the
resistor array are connected at pin 5. The
CAT5119/5124 is a similar variable resistor, except
the low terminal is connected to pin 5.
Digital Interface Operation
The MiniPots have two modes of operation when the
serial interface is active: increment and decrement
mode. The serial interface is only active when CS
¯¯ is low.
The CS
¯¯ and U/D
¯ inputs control the position of the
wiper along the resistor array. When CS
¯¯ transitions
from high to low, the part will go into increment mode
if U/D
¯ input is high, and into decrement mode when
U/D
¯ input is low. Once the mode is set, the device will
remain in that mode until CS
¯¯ goes high again. A low-
to-high transition at the U/D
¯ pin will increment or
decrement the wiper position depending on the
current mode (Figures 1 and 2).
When the CS
¯¯ input transitions to high (serial interface
inactive), the value of the counter is stored and the
wiper position is maintained.
Note that when the wiper reaches the maximum (or
minimum) tap position, the wiper will not wrap around
to the minimum (or maximum) position.
Power-On Reset
All parts in this family feature power-on reset (POR)
circuitry that sets the wiper position to midscale at
power-up. By default, the chip is in the increment mode.
Figure 1. Serial Interface Timing Diagram, Increment Mode
Figure 2. Serial Interface Timing Diagram, Decrement Mode
CS
U/D
W
t CU
t IL
tIH
tSETTLE
tIC
tCI
t SETTLE
Note: "W" is not a digital signal. It represents wiper transitions.
CS
U/D
W
t CU
t IL
t IH
t IC
t SETTLE
t CI
t SETTLE
Note: "W" is not a digital signal. It represents wiper transitions.


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