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CAT5115VI-00-GT3 Datasheet(PDF) 2 Page - ON Semiconductor |
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CAT5115VI-00-GT3 Datasheet(HTML) 2 Page - ON Semiconductor |
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2 / 14 page  CAT5115 Doc. No. MD-2117 Rev. J 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 RWB INC ¯¯¯ 3 6 GND U/D ¯ 4 5 RH CAT TDFN 8-Pad (ZD7) Top View INC ¯¯¯ 1 8 VCC U/D ¯ 2 7 CS ¯¯ RH 3 6 RL GND 4 5 RWB 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 FUNCTION 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 CAT5115 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 CAT5115 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 32 available tap positions including the resistor end points, RH and RL. There are 31 resistor elements connected in series between the RH and RL terminals. The wiper terminal is connected to one of the 32 taps and controlled by three inputs, INC ¯¯¯, U/D ¯ and CS ¯¯ . These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. With CS ¯¯ set LOW the CAT5115 is selected and will respond to the U/D ¯ and INC ¯¯¯ inputs. HIGH to LOW transitions on INC ¯¯¯ will increment or decrement the wiper (depending on the state of the U/D ¯ input and five-bit counter). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. When the CAT5115 is powered-down, the wiper position is reset. When power is restored, the counter is set to the mid point, tap 15. |
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