X9319US8

Digitally Controlled Potentiometer (XDCP™) X9319 FEATURES DESCRIPTION • • • • The Xicor X9319 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. • • • • • Solid-state potentiometer 3-wire serial interface Terminal voltage, 0 to +10V 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 and 50KΩ Packages —8-lead SOIC and DIP 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. APPLICATIONS • • • • • LCD bias control DC bias adjustment Gain and offset trim Laser diode bias control Voltage regulator output control BLOCK DIAGRAM U/D INC CS VCC (Supply Voltage) Control and Memory Device Select (CS) RH 99 98 97 RH Up/Down (U/D) Increment (INC) Up/Down Counter 7-Bit Nonvolatile Memory RW RL 96 One of One Hundred Decoder Wiper Switches Resistor Array 2 VSS (Ground) General VCC VSS Store and Recall Control Circuitry 1 0 RL RW Detailed XDCP is a trademark of Xicor, Inc. REV 1.7 7/10/03 www.xicor.com 1 of 10 X9319 PIN CONFIGURATION DIP/SOIC INC 1 U/D 2 RH 3 VSS 4 X9319 8 VCC 7 CS 6 RL 5 RW ORDERING INFO Ordering Number RTOTAL X9319WS8 10KΩ 8-lead SOIC 0°C to 70°C X9319WS8I 10KΩ 8-lead SOIC -40°C to +85°C Package Operating Temperature Range X9319WP8 10KΩ 8-lead Plastic DIP 0°C to 70°C X9319WP8I 10KΩ 8-lead Plastic DIP -40°C to +85°C X9319US8 50KΩ 8-lead SOIC 0°C to 70°C X9319US8I 50KΩ 8-lead SOIC -40°C to +85°C X9319UP8 50KΩ 8-lead Plastic DIP 0°C to 70°C X9319UP8I 50KΩ 8-lead Plastic DIP -40°C to +85°C PIN DESCRIPTIONS DIP/ SOIC Symbol 1 INC Increment. Toggling INC while CS is low moves the wiper either up or down. 2 U/D Up/Down. The U/D input controls the direction of the wiper movement. 3 RH The high terminal is equivalent to one of the fixed terminals of a mechanical potentiometer. 4 VSS Ground. 5 RW The wiper terminal is equivalent to the movable terminal of a mechanical potentiometer. 6 The low terminal is equivalent to one of the fixed terminals of a mechanical potentiometer. 7 RL CS 8 VCC Supply Voltage. REV 1.7 7/10/03 Brief Description Chip Select. The device is selected when the CS input is LOW, and de-selected when CS is high. www.xicor.com 2 of 10 X9319 ABSOLUTE MAXIMUM RATINGS COMMENT Junction 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 RH, RW, RL to ground .......................................... +12V Lead temperature (soldering 10 seconds)..........300°C IW (10 seconds) ................................................. ±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. POTENTIOMETER CHARACTERISTICS (VCC = 5V ±10%, TA = Full Operating Temperature Range unless otherwise stated) Limits Symbol VRH/RL Parameter Min. Typ.(4) +20 % See ordering information for values RH/RL terminal voltage VSS 10 V VSS = 0V 25 mW Wiper resistance IW Wiper current(5) Resolution (1) (2) See test circuit -120 dBV Ref: 1kHz 1 % -0.2 Relative linearity RTOTAL temperature coefficient(5) +1 MI(3) +0.2 MI(3) ±300 (5),(6) Ratiometric temperature coefficient REV 1.7 7/10/03 Ω mA -1 Absolute linearity -20 Potentiometer capacitances Supply Voltage 200 +3.0 40 -3.0 Noise(7) VCC Test Conditions/Notes -20 RW CH/CL/CW Unit End to end resistance tolerance Power rating (5) Max. 10/10/25 www.xicor.com V(RH) = 10V, V(RL) = 0V ppm/°C +20 4.5 IW = 1mA ppm/°C pF 5.5 See equivalent circuit V 3 of 10 X9319 D.C. OPERATING CHARACTERISTICS (VCC = 5V ±10%, TA = Full Operating Temperature Range unless otherwise stated) Limits Symbol Parameter Typ.(4) Max. Unit 1 3 mA CS = VIL, U/D = VIL or VIH and INC = 0.4V/2.4V @ min. tCYC RL, RH, RW not connected 300 1000 µA CS ≥ 2.4V, U/D and INC = 0.4V RL, RH, RW not connected -10 +10 µA VIN = VSS to VCC Min. ICC VCC active current (Increment) ISB Standby supply current ILI CS, INC, U/D input leakage current VIH CS, INC, U/D input HIGH voltage 2 VCC + 1 V VIL CS, INC, U/D input LOW voltage –1 0.8 V CIN(5) CS, INC, U/D input capacitance 10 pF Test Conditions VCC = 5V, VIN = VSS, TA = 25°C, f = 1MHz ENDURANCE AND DATA RETENTION (VCC = 5V ±10%, TA = Full Operating Temperature Range) Parameter Min. Unit Minimum endurance 100,000 Data changes per bit Data retention 100 Years Notes: (1) Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = [V(R W(n)(actual))–V(RW(n)(expected))]/MI V(RW(n)(expected)) = n(V(RH)-V(RL))/99 + V(RL), with n from 0 to 99. (2) Relative linearity is a measure of the error in step size between taps = [V(RW(n+1))–(V(RW(n)) – MI)]/MI (3) 1 Ml = Minimum Increment = [V(RH)–V(RL)]/99. (4) Typical values are for TA = 25°C and nominal supply voltage. (5) Guaranteed by device characterization. (6) Ratiometric temperature coefficient = (V(RW)T1(n)–V(RW)T2(n))/[V(RW)T1(n)(T1–T2) x 106], with T1 & T2 being 2 temperatures, and n from 0 to 99. (7) Measured with wiper at tap position 31, RL grounded, using test circuit. Test Circuit Equivalent Circuit RTOTAL Test Point RH CW CH RW Force Current CL RL 10pF 25pF 10pF RW A.C. CONDITIONS OF TEST Input pulse levels 0.8V to 2.0V Input rise and fall times 10ns Input reference levels 1.4V REV 1.7 7/10/03 www.xicor.com 4 of 10 X9319 A.C. OPERATING CHARACTERISTICS (VCC = 5V ±10%, TA = Full Operating Temperature Range unless otherwise stated) Limits Symbol tCl Parameter Min. Typ.(4) Max. Unit CS to INC setup 100 ns tlD(5) INC HIGH to U/D change 100 ns tDI(5) U/D to INC setup 1 µs tlL INC LOW period 1 µs tlH INC HIGH period 1 µs tlC INC inactive to CS inactive 1 µs tCPHS CS deselect time (STORE) 20 ms CS deselect time (NO STORE) 1 µs tCPHNS(5) tIW(5) INC to RW change tCYC INC cycle time tR, tF(5) tPU(5) tR VCC(5) 100 500 µs 4 µs INC input rise and fall time 500 µs Power up to wiper stable 500 µs 50 V/ms VCC power-up rate 0.2 POWER UP AND DOWN REQUIREMENTS In order to prevent unwanted tap position changes, or an inadvertant store, bring the CS and INC high before or concurrently with the VCC pin on powerup. 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 1 millisecond after VCC reaches its final value. The VCC ramp spec is always in effect. A.C. TIMING CS tCYC tCI tIL tIC tIH tCPHNS tCPHS 90% 90% 10% INC tID tDI tF tR U/D tIW RW REV 1.7 7/10/03 MI (3) www.xicor.com 5 of 10 X9319 PIN DESCRIPTIONS PIN NAMES RH and RL Symbol The high (RH) and low (RL) terminals of the X9319 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. RW 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. 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 incremented 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 X9319 will be placed in the low power standby mode until the device is selected once again. PIN CONFIGURATION DIP/SOIC 8 VCC 7 CS 3 6 RL 4 5 RW INC 1 U/D 2 RH VSS REV 1.7 7/10/03 X9319 Description RH High terminal RW Wiper terminal RL Low terminal VSS Ground VCC Supply voltage U/D Up/Down control input INC Increment control input CS Chip select control input PRINCIPLES OF OPERATION There are three sections of the X9319: the control section, the nonvolatile memory, and the resistor array. The 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 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. Electronic switches at either end of the array and between each resistor provide an electrical connection to the wiper pin, RW. The wiper acts like its mechanical equivalent and does not move beyond the first or 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. www.xicor.com 6 of 10 X9319 MODE SELECTION 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) the seven bit counter. The output of this counter is decoded to select one of one hundred wiper positions along the resistive array. CS INC U/D Mode L H Wiper up L L Wiper down H X Store wiper position to nonvolatile memory X X Standby L X No store, return to standby L H Wiper Up (not recommended) L L Wiper Down (not recommended) H 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 X9319, 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. REV 1.7 7/10/03 www.xicor.com 7 of 10 X9319 APPLICATIONS INFORMATION Electronic digitally controlled (XDCP) potentiometers provide three powerful application advantages; (1) the variability and reliability of a solid-state potentiometer, (2) the flexibility of computer-based digital controls, and (3) the retentivity of nonvolatile memory used for the storage of multiple potentiometer settings or data. Basic Configurations of Electronic Potentiometers VREF VREF RH RW RL I Three terminal potentiometer; variable voltage divider Two terminal variable resistor; variable current Basic Circuits Buffered Reference Voltage Single Supply Inverting Amplifier Cascading Techniques R1 +V +V +V R1 +5V RW VREF + VS LMC7101 VOUT – +8V R2 X RW – 100K +V VO + +10V LMC7101 (a) Voltage Regulator VIN 100K RW VOUT = VW/RW VO = (R2/R1)VS (b) Offset Voltage Adjustment VO (REG) 317 R1 Comparator with Hysteresis R2 VS R1 VS LT311A +12V 100KΩ – + VO – + Iadj 10KΩ 10KΩ VO (REG) = 1.25V (1+R2/R1)+Iadj R2 } LMC7101 10KΩ } R2 VO R1 R2 VUL = {R1/(R1+R2)} VO(max) VLL = {R1/(R1+R2)} VO(min) +15V (for additional circuits see AN115) REV 1.7 7/10/03 www.xicor.com 8 of 10 X9319 PACKAGING INFORMATION 8-Lead Plastic Small Outline Package, Type S (8-lead SOIC) 0.150 (3.80) 0.228 (5.80) 0.158 (4.00) 0.244 (6.20) Pin 1 Index Pin 1 0.014 (0.35) 0.019 (0.49) 0.188 (4.78) 0.197 (5.00) (4X) 7° 0.053 (1.35) 0.069 (1.75) 0.004 (0.19) 0.010 (0.25) 0.050 (1.27) 0.010 (0.25) X 45° 0.020 (0.50) 0.050"Typical 0.050" Typical 0° - 8° 0.0075 (0.19) 0.010 (0.25) 0.250" 0.016 (0.410) 0.037 (0.937) FOOTPRINT 0.030" Typical 8 Places NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) REV 1.7 7/10/03 www.xicor.com 9 of 10 X9319 PACKAGING INFORMATION 8-Lead Plastic, DIP, Package Code P8 0.430 (10.92) 0.360 (9.14) 0.260 (6.60) 0.240 (6.10) Pin 1 Index Pin 1 0.060 (1.52) 0.020 (0.51) 0.300 (7.62) Ref. Half Shoulder Width On All End Pins Optional 0.145 (3.68) 0.128 (3.25) Seating Plane 0.025 (0.64) 0.015 (0.38) 0.065 (1.65) 0.045 (1.14) 0.150 (3.81) 0.125 (3.18) 0.110 (2.79) 0.090 (2.29) .073 (1.84) Max. 0.020 (0.51) 0.016 (0.41) 0.325 (8.25) 0.300 (7.62) 0° 15° Typ. 0.010 (0.25) NOTE: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH LIMITED WARRANTY ©Xicor, Inc. 2003 Patents Pending Devices sold by Xicor, Inc. are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Xicor, Inc. makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Xicor, Inc. makes no warranty of merchantability or fitness for any purpose. Xicor, Inc. reserves the right to discontinue production and change specifications and prices at any time and without notice. Xicor, Inc. assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xicor, Inc. product. No other circuits, patents, or licenses are implied. TRADEMARK DISCLAIMER: Xicor and the Xicor logo are registered trademarks of Xicor, Inc. AutoStore, Direct Write, Block Lock, SerialFlash, MPS, BiasLock and XDCP are also trademarks of Xicor, Inc. All others belong to their respective owners. U.S. PATENTS Xicor products are covered by one or more of the following U.S. Patents: 4,326,134; 4,393,481; 4,404,475; 4,450,402; 4,486,769; 4,488,060; 4,520,461; 4,533,846; 4,599,706; 4,617,652; 4,668,932; 4,752,912; 4,829,482; 4,874,967; 4,883,976; 4,980,859; 5,012,132; 5,003,197; 5,023,694; 5,084,667; 5,153,880; 5,153,691; 5,161,137; 5,219,774; 5,270,927; 5,324,676; 5,434,396; 5,544,103; 5,587,573; 5,835,409; 5,977,585. Foreign patents and additional patents pending. LIFE RELATED POLICY In situations where semiconductor component failure may endanger life, system designers using this product should design the system with appropriate error detection and correction, redundancy and back-up features to prevent such an occurrence. Xicor’s products are not authorized for use in critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. REV 1.7 7/10/03 www.xicor.com Characteristics subject to change without notice. 10 of 10