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CAT5129 Datasheet(PDF) 3 Page - Catalyst Semiconductor |
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CAT5129 Datasheet(HTML) 3 Page - Catalyst Semiconductor |
3 / 12 page CAT5127, CAT5129 © 2006 Catalyst Semiconductor, Inc. 3 Doc. No. 2127 Rev. A Characteristics subject to change without notice DEVICE OPERATION The CAT5127 operates like a digitally controlled variable resistor with RH and RL equivalent to the high and low terminals. There are 32 available tap posi- tions including the resistor end points, RH and RL. There are 31 resistor elements connected in series between the RH and RL terminals. The CAT5129 operates like a digitally controlled variable resistor with RH equivalent to the high terminal. There are 32 available tap positions including the resistor end points, RH and GND. There are 31 resistor elements connected in series between the RH and GND terminals. Operation is 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. The selected wiper position can be stored in nonvolatile memory using the INC ¯¯¯ and CS ¯¯ inputs. With CS ¯¯ set LOW, the device 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 five-bit counter). The wiper, when at either end 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 device 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 device 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/GND High Low to High X Store Wiper Position Low Low to High X No Store, Return to Standby X High X Standby Variable Resistor Equivalent Circuit RL/GND CL CH RH |
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