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CAT5116VI-GT3 Datasheet(PDF) 2 Page - ON Semiconductor |
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CAT5116VI-GT3 Datasheet(HTML) 2 Page - ON Semiconductor |
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2 / 12 page  CAT5116 Doc. No. MD-2118 Rev. M 2 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice PIN CONFIGURATION PDIP 8-Lead (L) SOIC 8 Lead (V) MSOP 8 Lead (Z) INC ¯¯¯ 1 8 VCC U/D ¯ 2 7 CS ¯¯ RH 3 6 RL GND 4 5 RWB CAT TSSOP 8 Lead (Y) CS ¯¯ 1 8 RL VCC 2 7 RW INC ¯¯¯ 3 6 GND U/D ¯ 4 5 RH CAT PIN DESCRIPTIONS Name Function INC ¯¯¯ Increment Control U/D ¯ Up/Down Control RH Potentiometer High Terminal GND Ground RW Buffered Wiper Terminal RL Potentiometer Low Terminal CS ¯¯ Chip Select VCC Supply Voltage PIN DESCRIPTION INC ¯¯¯: Increment Control Input The INC ¯¯¯ input moves the wiper in the up or down direction determined by the condition of the U/D ¯ input. 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. 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. RW: Wiper Potentiometer Terminal RW is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, INC ¯¯¯, U/D ¯ and CS ¯¯ . Voltage applied to the RW terminal cannot exceed the supply voltage, VCC or go below ground, GND. RL: Low End Potentiometer Terminal 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 electrically interchangeable. CS ¯¯ : Chip Select The chip select input is used to activate the control input of the CAT5116 and is active low. When in a high state, activity on the INC ¯¯¯ and U/D ¯ inputs will not affect or change the position of the wiper. DEVICE OPERATION The CAT5116 operates like a digitally controlled potentiometer with RH and RL equivalent to the high and low terminals and RW equivalent to the mechanical potentiometer's wiper. There are 100 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 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 memory using the INC ¯¯¯ and CS ¯¯ inputs. With CS ¯¯ set LOW the CAT5116 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 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 counter is stored in nonvolatile memory whenever CS ¯¯ transitions HIGH while the INC ¯¯¯ input is also HIGH. When the CAT5116 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. With INC ¯¯¯ set low, the CAT5116 may be deselected 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 nonvolatile memory. |
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Similar Description - CAT5116VI-GT3 |
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