Terminal Voltage 0V to 15V

www.DataSheet4U.com IGNS W DES F OR N E E ME N T DED OMMEN DED REPLAC nter at OT R E C N Ce N COMME Datal Sheetort om/tsc upp NO RE hnica S .intersil.c c w t our Te contac TERSIL or ww 88-IN 1-8 ® X9312 Terminal Voltage 0V to +15V, 100 Taps March 15, 2005 FN8176.0 Digitally Controlled Potentiometer (XDCP™) FEATURES • • • • Solid-state potentiometer 3-wire serial interface Terminal voltage, 0 to +15V 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 values = 10kΩ, 50kΩ, and 100kΩ Packages —8-lead SOIC and DIP DESCRIPTION The Intersil X9312 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 or as a two-terminal variable resistor in a wide variety of applications including: – control – parameter adjustments – signal processing • • • • • BLOCK DIAGRAM U/D INC CS 7-Bit Up/Down Counter 99 98 97 7-Bit Nonvolatile Memory 96 One of One Hundred Decoder 2 VSS (Ground) General VCC VSS Store and Recall Control Circuitry 1 0 RL/VL RW/VW Detailed RH/VH VCC (Supply Voltage) Up/Down (U/D) Increment (INC) Device Select (CS) Control and Memory RH/VH RW/VW Transfer Gates Resistor Array RL/VL 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc. XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners. www.DataSheet4U.com X9312 PIN NAMES Symbol RH/VH RW/VW RL/VL VSS VCC U/D INC CS PIN DESCRIPTIONS RH/VH and RL/VL The high (RH/VH) and low (RL/VL) terminals of the X9312 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is 0V and the maximum is +15V. The terminology of RL/VL and RH/VH 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. RW/VW Rw/Vw 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. The wiper terminal series resistance is typically 40Ω. 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. The current counter value is stored in nonvolatile memory when CS is returned HIGH while the INC input is also HIGH. After the store operation is complete the X9312 will be placed in the low power standby mode until the device is selected once again. PIN CONFIGURATION DIP/SOIC INC U/D RH/VH VSS 1 2 3 4 X9312 8 7 6 5 VCC CS RL/VL RW/VW Description High terminal Wiper terminal Low terminal Ground Supply voltage Up/Down control input Increment control input Chip select control input PRINCIPLES OF OPERATION There are three sections of the X9312: the input control, counter and decode section; the nonvolatile memory; 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. Under the proper conditions the contents of the counter can be stored in nonvolatile memory and retained for future use. The resistor array is comprised of 99 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. When the device is powered-down, the last wiper position stored will be maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the wiper is set to the value last stored. 2 FN8176.0 March 15, 2005 www.DataSheet4U.com X9312 MODE SELECTION CS L L H H X L 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 one of one hundred wiper positions along the resistive array. The value of the counter is stored in nonvolatile memory whenever CS transitions HIGH while the INC input is also HIGH. The system may select the X9312, move the wiper and deselect the device without having to store the latest wiper position in nonvolatile memory. After the wiper movement is performed as described above and once the new position is reached, the system must keep INC LOW while taking CS HIGH. The new wiper position will be maintained until changed by the system or until a powerup/down cycle recalled the previously stored data. This procedure allows the system to always power-up to a preset value stored in nonvolatile memory; then during system operation minor adjustments could be made. The adjustments might be based on user preference, system parameter changes due to temperature drift, etc... The state of U/D may be changed while CS remains LOW. This allows the host system to enable the device and then move the wiper up and down until the proper trim is attained. INC U/D H L X X X Wiper up Mode Wiper down Store wiper position Standby current No store, return to standby SYMBOL TABLE WAVEFORM INPUTS Must be steady May change from Low to High May change from High to Low Don’t Care: Changes Allowed N/A OUTPUTS Will be steady Will change from Low to High Will change from High to Low Changing: State Not Known Center Line is High Impedance 3 FN8176.0 March 15, 2005 www.DataSheet4U.com X9312 COMMENT 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. ABSOLUTE MAXIMUM RATINGS Temperature under bias .................... -65°C to +135°C Storage temperature ......................... -65°C to +150°C Voltage on CS, INC, U/D and VCC with respect to VSS ................................. -1V to +7V ∆V = |VH - VL| ........................................................ 15V Lead temperature (soldering 10 seconds) ......... 300°C IW (10 seconds) ...............................................±8.8mA RECOMMENDED OPERATING CONDITIONS Temperature Commercial Industrial Min. 0°C -40°C Max. +70°C +85°C Supply Voltage (VCC) X9312 Limits 5V ±10% POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.) Limits Symbol VVH VVL Parameter End to end resistance tolerance VH terminal voltage VL terminal voltage Power rating Power rating Min. VSS VSS Typ. Max. ±20 15 15 25 225 Unit % V V mW mW Ω mA dBV % Test Conditions/Notes VSS = 0V VSS = 0V RTOTAL ≥ 10kΩ RTOTAL = 1kΩ IW = 1mA, VCC = 5V Ref: 1kHz Rw(n)(actual) - Rw(n)(expected) Rw(n+1) - [Rw(n) + MI] RW IW Wiper resistance Wiper current Noise Resolution Absolute linearity(1) Relative linearity(2) RTOTAL temperature coefficient Ratiometric temperature coefficient 40 -120 1 100 ±4.4 ±1 ±0.2 ±300 ±20 10/10/25 MI(3) MI(3) ppm/°C ppm/°C pF CH/CL/CW Potentiometer capacitances See circuit #3 Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (Vw(n)(actual) - Vw(n)(expected)) = ±1 Ml Maximum. (2) Relative linearity is a measure of the error in step size between taps = RW(n+1 - [Rw(n) + Ml] = ±0.2 Ml. (3) 1 Ml = Minimum Increment = RTOT/99. 4 FN8176.0 March 15, 2005 www.DataSheet4U.com X9312 D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol ICC ISB ILI VIH VIL CIN(5) Parameter VCC active current (Increment) Standby supply current CS, INC, U/D input leakage current CS, INC, U/D input HIGH voltage CS, INC, U/D input LOW voltage CS, INC, U/D input capacitance Min. Typ.(4) 1 500 M