X93154 ® Low Noise, Low Power, 32 Taps Data Sheet October 5, 2005 Digitally Controlled Potentiometer (XDCP™) Features • Solid-State Potentiometer The Intersil X93154 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 31 resistive elements and a wiper switching network. 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 is connected as a two-terminal variable resistor and can be used in a wide variety of applications including: - Bias and Gain Control - LCD Contrast Adjustment FN8180.2 • 3-Wire Serial Interface • 32 Wiper Tap Points - Wiper position stored in nonvolatile memory and recalled on power-up • 31 Resistive Elements - Temperature compensated - Maximum resistance tolerance of ±30% - Terminal voltage, 0 to VCC • Low Power CMOS - VCC = 3V±10% - Active current, 250µA max. - Standby current, 1µA max. • High Reliability - Endurance 200,000 data changes per bit - Register data retention, 100 years • RTOTAL Value = 50kΩ • Packages - 8 Ld MSOP, TDFN • Pb-Free Plus Anneal Available (RoHS Compliant) Pinouts X93154 (8 LD TDFN) TOP VIEW X93154 (8 LD MSOP) TOP VIEW INC 1 8 VCC U/D 2 7 CS RH VSS 6 3 5 4 RL INC 1 8 VCC U/D 2 7 CS RH 3 6 RL 4 5 NC1 VSS NC1 1NC can be left unconnected, or connected to any voltage between V SS and VCC 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2004, 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners. X93154 Ordering Information PART NUMBER PART MARKING VCC LIMITS (V) RTOTAL (kΩ) TEMP RANGE (°C) PACKAGE 3 ±10% 50 -40 to 85 8 Ld MSOP X93154UM8I-3* AGK X93154UM8IZ-3* (Note) AIW -40 to 85 8 Ld MSOP (Pb-free) X93154UU8IZ-3* (Note) AKH -40 to 85 8 Ld TDFN (Pb-free) *Add "T1" suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Block Diagram VCC (Supply Voltage) U/D INC CS 30K 29 (U/D) (INC) RH 31 30 RH Up/Down Increment 5-Bit Up/Down Counter 5-Bit Nonvolatile Memory Control and Memory Device Select Store and Control Recall Circuitry (CS) RL 28 One of Thirty Two Decoder Transfer Gates Resistor Array 2 1 VCC 0 VSS (Ground) VSS RL General Detailed Pin Descriptions MSOP, TDFN SYMBOL BRIEF DESCRIPTION 1 INC 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. 2 U/D Up/Down (U/D). The U/D input controls the direction of the wiper movement and whether the counter is incremented or decremented. 3 RH RH. The RH and RL pins of the X93154 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH and RL references the relative position of the terminal in relation to wiper movement direction selected by the U/D input. 4 VSS Ground. 5 NC No Connection. (or can be connected to any voltage between VSS and VCC.) 6 RL RL. The RH and RL pins of the X93154 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH and RL references the relative position of the terminal in relation to wiper movement direction selected by the U/D input. 7 CS 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 X93154 will be placed in the low power standby mode until the device is selected once again. 8 VCC Supply Voltage. 2 FN8180.2 October 5, 2005 X93154 Absolute Maximum Ratings Recommended Operating Conditions Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65°C to +135°C Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Voltage on CS, INC, U/D, RH, RL and VCC with respect to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to +6.5V Lead temperature (soldering 10s) . . . . . . . . . . . . . . . . . . . . . . 300°C Maximum resistor current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Temperature Range Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C Supply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3V ±10%(8) CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Potentiometer Specifications SYMBOL RTOT VR Over recommended operating conditions unless otherwise stated. PARAMETER TEST CONDITIONS/NOTES MIN TYP MAX UNIT End to end resistance 35 50 65 kΩ RH, RL terminal voltages 0 VCC V 1 mW(7) Power rating RTOTAL = 50kΩ Noise Ref: 1kHz RW Wiper Resistance (5) (6) 1000 Ω IW Wiper Current (5) (6) 0.6 mA Resolution CH/CL/CW dBV(7) -120 3 Absolute linearity(1) VH(n)(actual)-VH(n)(expected) Relative linearity(2) VH(n+1)-[VH(n)+MI] RTOTAL temperature coefficient (7) Potentiometer capacitances See circuit #3 % ±1 MI(3) ±0.5 MI(3) ±35 ppm/°C 10/10/25 pF(7) NOTES: 1. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (VH(n)(actual)-VH(n)(expected)) = ±1 Ml Maximum. n = 1 .. 29 only 2. Relative linearity is a measure of the error in step size between taps = VH(n+1)—[VH(n) + Ml] = ±0.5 Ml, n = 1 .. 29 only. 3. 1 Ml = Minimum Increment = RTOT/31. 4. Typical values are for TA = 25°C and nominal supply voltage. 5. This parameter is periodically sampled and not 100% tested 6. Typical values are for TA = 25°C and nominal supply voltage. 7. This parameter is not 100% tested. 8. When performing multiple write operations, VCC must not decrease by more than 150mV from its initial value. DC Electrical Specifications SYMBOL Over recommended operating conditions unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP(4) MAX UNIT 50 250 µA 600 µA ICC1 VCC active current (Increment) CS = VIL, U/D = VIL or VIH and INC = 0.4V @ max. tCYC ICC2 VCC active current (Store) (EEPROM Store) CS = VIH, U/D = VIL or VIH and INC = VIH @ max. tWR ISB Standby supply current CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V 1 µA ILI CS VIN = VCC ±1 µA ILI CS VCC = 3V, CS = 0 150 µA ILI INC, U/D input leakage current VIN = VSS to VCC ±1 µA VIH CS, INC, U/D input HIGH voltage VCC x 0.7 VCC + 0.5 V VIL CS, INC, U/D input LOW voltage -0.5 VCC x 0.1 V CIN(5)(7) CS, INC, U/D input capacitance 10 pF 3 VCC = 3V, VIN = VSS, TA = 25°C, f = 1MHz 60 100 FN8180.2 October 5, 2005 X93154 Circuit #2 SPICE Macro Model Endurance and Data Retention PARAMETER MIN UNIT Minimum endurance 200,000 Data changes per bit Data retention 100 RTOTAL RH Years CH Test Circuit #1 CL CW RL 10pF 25pF Test Point 10pF VH/RH A.C. Conditions of Test VL AC Electrical Specifications SYMBOL Input pulse levels 0V to 3V Input rise and fall times 10ns Input reference levels 1.5V Over recommended operating conditions unless otherwise specified. PARAMETER TYP(6) MIN MAX UNIT tCl CS to INC setup 100 ns tlD INC HIGH to U/D change 100 ns tDI U/D to INC setup 100 ns tlL INC LOW period 1 µs tlH INC HIGH period 1 µs tlC INC Inactive to CS inactive 1 µs tCPH CS Deselect time (NO STORE) 250 ns tCPH CS Deselect time (STORE) 10 ms tCYC INC cycle time 2 µs tR, tF(7) tR VCC(7) tWR INC input rise and fall time VCC power-up rate 1.0 Store cycle 500 µs 10,000 V/ms 10 ms 5 Power Up and Down Requirements potentiometer pins provided that VCC is always more positive than or equal to VH and VL, i.e., VCC ≥ VH,VL. The VCC ramp rate spec is always in effect. There are no restrictions on the power-up or power-down conditions of VCC and the voltages applied to the A.C. Timing CS tCYC tCI tIL tIH tIC (Store) tCPH 90% INC 90% 10% tID tDI tF tR U/D 4 FN8180.2 October 5, 2005 X93154 Pin Descriptions Principles of Operation RH and RL There are three sections of the X93154: 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 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 RH and RL pins of the X93154 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH and RL references the relative position of the terminal in relation to wiper movement direction selected by the U/D input. 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 X93154 will be placed in the low power standby mode until the device is selected once again. Pin Configuration 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 tIW (INC to VW change). The 2terminal resistance value for the device can temporarily change 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. Instructions and Programming MSOP INC 1 U/D 2 RH/VH 3 VSS 8 VCC 7 CS X93154 4 6 RL/VL 5 NC* *NC = No Connect. Can be connected to any voltage between VSS and VCC, or left unconnected. Pin Names SYMBOL DESCRIPTION RH High terminal RL Low terminal VSS Ground VCC Supply voltage U/D Up/Down control input INC Increment control input CS Chip Select control input 5 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 five bit counter. The output of this counter is decoded to select one of thirty two 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. In order to avoid an accidental store during power-up, CS must go HIGH with VCC during initial power-up. When performing multiple write operations, VCC must not decrease by more than 150mV from its initial value. When left open, the CS pin is internally pulled up to VCC by an internal 30k resistor. The system may select the X93154, 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 power-up/down cycle recalled the previously stored data. In order to recall the stored position of the wiper on power-up, the CS pin must be held HIGH. FN8180.2 October 5, 2005 X93154 Symbol Table 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, or other system trim requirements. INPUTS OUTPUTS Must be steady Will be steady 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. May change from Low to High Will change from Low to High Mode Selection May change from High to Low Will change from High to Low Don’t Care: Changes Allowed Changing: State Not Known N/A Center Line is High Impedance CS INC U/D MODE L H Wiper Up L L Wiper Down H X Store Wiper Position X X Standby Current L X No Store, Return to Standby L H Wiper Up (not recommended) L L Wiper Down (not recommended) H WAVEFORM 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. VR I Two terminal variable resistor. variable current Low Voltage High Impedance Instrumentation Amplifier 3.3V 10K + + 10K 50K U1A 50K VIN VOUT U1C X93154 (RTOTAL) + 50K U1B 10K + - 6 Gain = 10K 50K 50K ) ( 1+ 10K RTOTAL U1 = LT1467 50k FN8180.2 October 5, 2005 X93154 Applications Information (Continued) Micro-Power LCD Contrast Control 3.3V 300K 240K 3.3V + 100K VOUT = -3.88 ( 1 + 100K U1A - - VOUT = -2.75V to -11.6V U1B U1 = LMC6042 + 50K 100K 100K ) 50K + RTOTAL -12V X93154 (RTOTAL) Single Supply Variable Gain Amplifier 3.3V 3.3V 20K + 20K VOUT U1 - Gain = 10K U1 = LMC6042 VIN 10K 7 RTOTAL X93154 (RTOTAL) FN8180.2 October 5, 2005 X93154 MSOP Packaging Information 8-Lead Miniature Small Outline Gull Wing Package Type M 0.118 ± 0.002 (3.00 ± 0.05) 0.012 + 0.006 / -0.002 (0.30 + 0.15 / -0.05) 0.0256 (0.65) Typ. R 0.014 (0.36) 0.118 ± 0.002 (3.00 ± 0.05) 0.030 (0.76) 0.0216 (0.55) 0.036 (0.91) 0.032 (0.81) 0.040 ± 0.002 (1.02 ± 0.05) 7° Typ. 0.008 (0.20) 0.004 (0.10) 0.0256" Typical 0.150 (3.81) Ref. 0.193 (4.90) Ref. 0.007 (0.18) 0.005 (0.13) 0.025" Typical 0.220" FOOTPRINT 0.020" Typical 8 Places NOTE: 1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS) 8 FN8180.2 October 5, 2005 X93154 TDFN Packaging Information 0.75±0.05 1.30±0.10 2.50±0.10 (S) DAP Size 1.6 x 1.3 0.40±0.10 2.00±0.10 (S) 0.0–0.05 Pin 1 Index Area 0.25±0.05 (8X) 0.50 Typ. (6X) 1.50 Ref. (2X) 0.20 Ref. All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 9 FN8180.2 October 5, 2005