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ISL90461UIH627-TK Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL90461UIH627-TK Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 7 page  5 FN8229.3 October 14, 2005 Pin Descriptions RH and RL The ISL90461 contains a digital potentiometer configured as a variable resistor. The wiper of the potentiometer is tied to one end of the potentiometer at terminal RH, and the RL pin is the other terminal of the potentiometer. The resistance from the RH pin to the RL pin will vary with the potentiometer setting. At the highest setting the resistance will be maximum (Rtot) and at the lowest setting it will be minimum. As the wiper position is incremented, the wiper will move from the Low terminal to the High terminal. Up/Down (U/D) The U/D input controls the direction of the wiper movement and whether the counter is incremented or decremented. Chip Select (CS) The device is selected when the CS input is LOW. The current counter value is stored in volatile memory when CS is returned HIGH. When CS is high, the device is placed in low power standby mode. Principles of Operation There are two sections of the ISL90461: the input control, counter and decode section; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. The resistor array is comprised of 31 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the connection at that point to the wiper. The wiper is connected to the RH terminal, forming a variable resistor from RH to RL. The direction of the wiper movement is defined when the device is selected. If during CS transition from High to Low the U/D input is LOW, the wiper will move down on each rising edge of U/D toggling. Similarly, the wiper will move up on each rising edge of U/D toggling if, during CS transition from High to Low, the U/D input is High. The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. If the wiper is moved several positions, multiple taps are connected to the wiper for tSETTLE (U/D to RH change). The 2-terminal resistance value for the device can temporarily change by a significant amount if the wiper is moved several positions. CS U/D RH - RL tCU tCI tIL tIH tIC tSETTLE FIGURE 2. SERIAL INTERFACE TIMING DIAGRAM, DECREMENT ISL90461 |
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