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CAT5126ZI-50-GT3 Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT5126ZI-50-GT3 Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 11 page CAT5126 Doc. No. 2129 Rev. A 6 © 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice DETAILED DESCRIPTION The CAT5126 devices are 10kΩ/50kΩ/100kΩ (end-to- end resistance) digitally controlled potentiometers. They have 32 tap positions that are accessible to the wiper along the resistor array between RH and RL. The wiper (RW) position is adjusted sequentially through the tap positions using a simple 2-wire interface. These digital potentiometers have an optional one-time programmable feature that sets the POR position of the wiper. The 2-wire interface can then be disabled, permanently preventing unwanted adjustment. DIGITAL INTERFACE OPERATION The CAT5126 devices have two modes of operation when the serial interface is active: increment mode 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 goes into increment mode if U/D ¯ is high (Figure 1), and into decrement mode if U/D ¯ is low (Figure 2). Once the mode is set, the device remains in that mode until CS ¯¯¯ goes high. A low-to-high transition at the U/D ¯ increments or decrements the wiper position depending on the current mode. The value of the counter is then stored and the wiper position is maintained till the device is Powered down. The wiper performs a make-before-break transition, ensuring that there is never an open circuit during a transition from one resistor tap to another. When the wiper is at either end (max/min) of the resistor array, additional transitions in the direction of the endpoint do not change the counter value (the counter does not wrap around). One-Time Programming The factory-set default position of the wiper on power- up is tap 16. However, the power-up position can be changed once using the one-time programming feature. After the wiper is moved to the desired position, the programming sequence is initiated by setting U/D ¯ high, applying 10V to VPP, and then taking CS ¯¯¯ low. Five pulses on CS ¯¯¯ (consisting of CS ¯¯¯ starting from low and going high for tCH and then low for tCL) program the device (Figure 3). The programming voltage should then be taken to zero. After the device is programmed, VPP can be set to zero or be allowed to float. The wiper position is still adjustable, but always returns to this programmed position on power-up. Figure 1: Increment Mode Serial Interface Timing Diagram Figure 2: Decrement Mode Serial Interface Timing Diagram VDD U/D CS VW tUP tCU tCI tIL tIH tIC tIW VDD U/D CS VW tUP tCU tCI tIL tIH tIC tIW |
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