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CAT5132(2005) 查看數據表（PDF） - Catalyst Semiconductor => Onsemi

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CAT5132
(Rev.:2005)

15 Volt Digitally Programmable Potentiometer (DPP™) with 128 Taps and 2-wire Interface

Catalyst Semiconductor => Onsemi

CAT5132 Datasheet PDF : 13 Pages

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CAT5132

POTENTIOMETER OPERATION

Power-On

The CAT5132 is a 128-position, digital controlled

potentiometer. At power-up the device turns on at the

mid-point wiper location (64) until the wiper register can

be loaded with the nonvolatile memory location previously

stored in the device. After the nonvolatile memory data

is loaded into the wiper register the wiper location will

change to the previously stored wiper position.

The end-to-end nominal resistance of the potentiometer

has 128 contact points linearly distributed across the

total resistor. Each of these contact points is addressed

by the 7 bit wiper register which is decoded to select one

of these 128 contact points.

Each contact point generates a linear resistive value

between the 0 position and the 127 position. These

values can be determined by dividing the end-to-end

value of the potentiometer by 127. In the case of the

10kΩ potentiometer~79Ω is the resistance between

each wiper position. However in addition to the ~79Ω for

each resistive segment of the potentiometer, a wiper

resistance offset must be considered. Table 8 shows the

effect of this value and how it would appear on the wiper

terminal.

This offset will appear in each of the CAT5132 end-to-

end resistance values in the same way as the 10kΩ

example. However resistance between each wiper

position for the 50kΩ version will be ~395Ω and for the

100kΩ version will be ~790Ω.

Table 8. Potentiometer Resistance and Wiper

Resistance Offset Effects

Position

127

Typical RW to RL Resistance for

10kΩ DPP

70Ω or

0Ω + 70Ω

149Ω or

79Ω + 70Ω

5,047Ω or

4,977Ω + 70Ω

10,070Ω or

10,000Ω + 70Ω