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CAT5122SDI-10GT3 Datasheet(PDF) 4 Page - Catalyst Semiconductor |
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CAT5122SDI-10GT3 Datasheet(HTML) 4 Page - Catalyst Semiconductor |
4 / 12 page CAT5120, CAT5121, CAT5122 Doc. No. MD-2121 Rev. E 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice FUNCTIONAL DESCRIPTION The CAT5120/5121/5122 consist of a fixed resistor and a wiper contact with 16-tap points that are digitally controlled through a2-wire up/down serial interface. Three end-to-end resistance values are available: 10kΩ, 50kΩ and 100kΩ. The CAT5120 is designed to operate as a potentiometer. In this configuration, the low terminal of the resistor array is connected to ground (pin 2). The CAT5122 performs as a variable resistor. In this device, the wiper terminal and high terminal of the resistor array is connected at pin 5. The CAT5121 is a similar variable resistor, except the low terminal is connected to pin 5. Digital Interface Operation The MiniPots have two modes of operation when the serial interface is active: increment and decrement mode. The serial interface is only active when CS ¯¯ is low. The CS ¯¯ and U/D ¯ inputs control the position of the wiper along the resistor array. When CS ¯¯ transitions from high to low, the part will go into increment mode if U/D ¯ input is high, and into decrement mode when U/D ¯ input is low. Once the mode is set, the device will remain in that mode until CS ¯¯ goes high again. A low- to-high transition at the U/D ¯ pin will increment or decrement the wiper position depending on the current mode (Figures 1 and 2). When the CS ¯¯ input transitions to high (serial interface inactive), the value of the counter is stored and the wiper position is maintained. Note that when the wiper reaches the maximum (or minimum) tap position, the wiper will not wrap around to the minimum (or maximum) position. Power-On Reset All parts in this family feature power-on reset (POR) circuitry that sets the wiper position to midscale at power-up. By default, the chip is in the increment mode. Figure 1. Serial Interface Timing Diagram, Increment Mode Figure 2. Serial Interface Timing Diagram, Decrement Mode CS U/D W t CU t IL tIH tSETTLE tIC tCI t SETTLE Note: "W" is not a digital signal. It represents wiper transitions. CS U/D W t CU t IL t IH t IC t SETTLE t CI t SETTLE Note: "W" is not a digital signal. It represents wiper transitions. |
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