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ISL23710UIU10Z bảng dữ liệu(PDF) 6 Page - Intersil Corporation |
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ISL23710UIU10Z bảng dữ liệu(HTML) 6 Page - Intersil Corporation |
6 / 8 page 6 FN6126.0 August 22, 2005 AC Timing Power Up and Down Requirements In order to prevent unwanted tap position changes, bring the CS and INC high before or concurrently with the VCC pin on power-up. The potentiometer voltages must be applied after this sequence is completed. During power-up, the data sheet parameters for the DCP do not fully apply until 1ms after VCC reaches its final value. The wiper will be set to its initial value (64d) once VCC exceeds VPOR. Pin Descriptions RH and RL The high (RH) and low (RL) terminals of the ISL23710 are equivalent to the fixed terminals of a mechanical potentiometer. The terminology of RL and RH references the relative position of the terminal in relation to wiper movement direction selected by the U/D input and not the voltage potential on the terminal. R W Rw is the wiper terminal and is equivalent to the movable terminal of a mechanical potentiometer. The position of the wiper within the array is determined by the control inputs. Up/Down (U/D) The U/D input controls the direction of the wiper movement and whether the counter is incriminated or decremented. Increment (INC) The INC input is negative-edge triggered. Toggling INC will move the wiper and either increment or decrement the counter in the direction indicated by the logic level on the U/D input. Chip Select (CS) The device is selected when the CS input is LOW. Principles of Operation There are three sections of the ISL23710: 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 127 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. 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. The electronic switches on the device operate in a “make before break” mode when the wiper changes tap positions. If the wiper is moved several positions, multiple taps are connected to the wiper for tIW (INC to VW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. Instructions and Programming The INC, U/D and CS inputs control the movement of the wiper along the resistor array. With CS set LOW the device is selected and enabled to respond to the U/D and INC inputs. HIGH to LOW transitions on INC will increment or decrement (depending on the state of the U/D input) a seven bit counter. The output of this counter is decoded to select CS INC U/D RW tCI tIL tIH tCYC tID tDI tIW MI (3) tICL tF tR 10% 90% 90% ISL23710 |
Số phần tương tự - ISL23710UIU10Z |
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Mô tả tương tự - ISL23710UIU10Z |
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