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CAT5116UITSSOP Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT5116UITSSOP Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 8 page CAT5116 6 Doc. No. 2118, Rev. J AC Timing CS INC U /D RW t CI t CYC t IL MI (3) 90% 90% 10% (store) t F t R t IW tID tDI t IH t CPH t IC (1) Typical values are for TA=25˚C and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. (3) MI in the AC Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position. 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 is 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 de-selected 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. OPERATING MODES Potentiometer Equivalent Circuit RL CL CH RH CW RW Rwi X: High or Low INC CS U/D Operation High to Low Low High Wiper Toward H High to Low Low Low Wiper Toward L High Low to High X Store Wiper Position Low Low to High X No Store, Return to Standby X High X Standby |
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