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CAT5132R-10TE13 Datasheet(PDF) 11 Page - Catalyst Semiconductor |
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CAT5132R-10TE13 Datasheet(HTML) 11 Page - Catalyst Semiconductor |
11 / 13 page CAT5132 11 Doc No. 25092, Rev. 00 © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 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 10k Ω potentiometer~79Ω is the resistance between each wiper position. However in addition to the ~79 Ω 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 10k Ω example. However resistance between each wiper position for the 50k Ω version will be ~395Ω and for the 100k Ω version will be ~790Ω. Table 8. Potentiometer Resistance and Wiper Resistance Offset Effects n o i t i s o P R l a c i p y T W R o t L r o f e c n a t s i s e R k 0 1 Ω Ω Ω Ω Ω P P D 0 00 7 Ω r o0 Ω 0 7 + Ω 1 09 4 1 Ω r o9 7 Ω 0 7 + Ω 3 67 4 0 , 5 Ω r o7 7 9 , 4 Ω 0 7 + Ω 7 2 10 7 0 , 0 1 Ω r o0 0 0 , 0 1 Ω 0 7 + Ω n o i t i s o P R l a c i p y T W R o t H r o f e c n a t s i s e R k 0 1 Ω Ω Ω Ω Ω P P D 0 00 7 0 , 0 1 Ω r o0 0 0 , 0 1 Ω 0 7 + Ω 4 67 4 0 , 5 Ω r o7 7 9 , 4 Ω 0 7 + Ω 6 2 19 4 1 Ω r o9 7 Ω 0 7 + Ω 7 2 10 7 Ω r o0 Ω 0 7 + Ω |
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Descripción similar - CAT5132R-10TE13 |
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