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The Intersil X9318 is a digitally controlled potentiometer (XDCP). The device consists of a resistor array, wiper switches, a control section, and nonvolatile memory. The wiper position is controlled by a 3-wire interface. The potentiometer is implemented by a resistor array composed of 99 resistive elements and a wiper switching network. Between each element and at either end are tap points accessible to the wiper terminal. The position of the wiper element is controlled by the CS, U/D, and INC inputs. The position of the wiper can be stored in nonvolatile memory and then be recalled upon a subsequent power-up operation. The device can be used as a three-terminal potentiometer for voltage control or as a two-terminal variable resistor for current control in a wide variety of applications.
X9318 Maximum Ratings
Junction Temperature under bias........ -65 to +135 Storage temperature .......................... -65 to +150 Voltage on CS, INC, U/D and VCC with respect to VSS ..................................... -1V to +7V RH, RW, RL to ground.............................................+10V Lead temperature (soldering 10s) ...................... 300 IW (10s) ..............................................................±6mA
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
X9318 Features
• Solid-state potentiometer • 3-wire serial interface • Terminal voltage, 0 to +8V • 100 wiper tap points -Wiper position stored in nonvolatile memory and recalled on power-up • 99 resistive elements -Temperature compensated -End to end resistance range ± 20% • Low power CMOS -VCC = 5V -Active current, 3mA max. -Standby current, 1mA max. • High reliability -Endurance, 100,000 data changes per bit -Register data retention, 100 years • RTOTAL value = 10kΩ • Packages -8 Ld SOIC and DIP • Pb-free plus anneal available (RoHS compliant)
X9318 Typical Application
• LCD bias control • DC bias adjustment • Gain and offset trim • Laser diode bias control • Voltage regulator output control