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CAT5133ZI-00-GT3 Datasheet(PDF) 2 Page - Catalyst Semiconductor |
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CAT5133ZI-00-GT3 Datasheet(HTML) 2 Page - Catalyst Semiconductor |
2 / 10 page CAT5133 Doc. No. MD-2125 Rev. C 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice DEVICE OPERATION The CAT5133 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 128 available tap positions including the resistor end points, RH and RL. There are 127 resistor elements connected in series between the RH and RL terminals. The wiper terminal is connected to one of the 128 taps and controlled by three inputs, INC ¯¯¯, U/D ¯ and CS ¯¯¯. These inputs control a 7-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 CAT5133 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 7-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 CAT5133 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 CAT5133 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. OPERATION MODES 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 PIN CONFIGURATION MSOP Package (GZ) PIN DESCRIPTIONS Pin Name Function 1 U/D ¯ Up/Down Data Input – Determines the direction of movement of the wiper 2 GND Ground 3 VCC Logic Supply Voltage (2.7V to 5.5V) 4 CS ¯¯¯ Chip Select – The chip is selected when the input is low. 5 N/C No Connect 6 RH High Reference Terminal for the Potentiometer 7 RW Wiper Terminal for the Potentiometer 8 RL Low Reference Terminal for the Potentiometer 9 V+ Analog Bias Voltage Input (+8.0V to +16.0V) 10 INC ¯¯¯ Increment Input – Moves the wiper in the direction determined by the Up/Down input on each negative edge |
Similar Part No. - CAT5133ZI-00-GT3 |
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Similar Description - CAT5133ZI-00-GT3 |
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