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CAT5110SBI-00-T10 Datasheet(PDF) 7 Page - Catalyst Semiconductor

Part # CAT5110SBI-00-T10
Description  32-Tap MiniPot Digitally Programmable Potentiometers with 2-Wire Interface
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5110SBI-00-T10 Datasheet(HTML) 7 Page - Catalyst Semiconductor

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CAT5110/5118/5119
7
Doc. No. 2120, Rev. A
FUNCTIONAL DESCRIPTION
The CAT5110/5118/5119 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: 10k
Ω,
50k
Ω and 100kΩ.
The CAT5110 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 performs as a variable resistor. In this
device, the wiper terminal and high terminal of the
resistor array is connected at pin 5. The CAT5119 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.
CS
U/D
W
tCU
tIL
tIH
tIC
tSETTLE
tCI
tSETTLE
Note: "W" is not a digital signal. It represents wiper transitions.
CS
U/D
W
tCU
tIL
tIH
tSETTLE
tIC
tCI
tSETTLE
Note: "W" is not a digital signal. It represents wiper transitions.
Figure 2. Serial Interface Timing Diagram, Decrement Mode
Figure 1. Serial Interface Timing Diagram, Increment Mode


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