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X93256
Data Sheet March 24, 2006 FN8188.1
Dual Digitally Controlled Potentiometers (XDCPsTM)
FEATURES * Dual solid-state potentiometers * Individual Up/Down interfaces * 32 wiper tap points per potentiometer --Wiper position stored in nonvolatile memory and recalled on power-up * 31 resistive elements per potentiometer --Temperature compensated --Maximum resistance tolerance of 25% --Terminal voltage, 0 to VCC * Low power CMOS --VCC = 2.7 V - 5.5 V. --Active current, 200A typical per potentiometer --Standby current, 4A max per potentiometer * High reliability --Endurance 200,000 data changes per bit --Register data retention, 100 years * RTOTAL value = 12.5k, 50k * Packages --14 Ld TSSOP * Pb-free plus anneal available (RoHS compliant)
DESCRIPTION The Intersil X93256 is a dual digitally controlled potentiometer (XDCP). The device consists of two resistor arrays, wiper switches, a control section, and nonvolatile memory. The wiper positions are controlled by individual Up/Down interfaces. A potentiometer is implemented by a resistor array composed of 31 resistive elements and a wiper switching network. The position of each wiper element is controlled by a set of independent 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. Each potentiometer is connected as a three-terminal variable resistor and can be used in a wide variety of applications including: - Bias and Gain Control - LCD Contrast Adjustment
BLOCK DIAGRAM
General Description VCC (Supply Voltage) RH1
30K
Detailed Single Potentiometer Description U/D1 INC1 CS1
5-Bit Up/Down Counter 31 30 29 5-Bit Nonvolatile Memory Store and Control Recall Circuitry VCC 28 One of Thirty Two Decoder 2 1 0 RL1 RH1
RW1 Up/Down (U/D1 & U/D2) Increment (INC1 & INC2) Device Select (CS1 & CS2) RL1 RH2
RW
Transfer Gates Resistor Array
Control and Memory
RW2 RL2 VSS (Ground)
VSS
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. 2005-2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
X93256
PIN CONFIGURATION
TSSOP Rw1 RL1 CS1 INC2 U/D2 RH2 VSS 1 2 3 4 5 6 7 14 13 12 X93256 11 10 9 8 RH1 U/D1 INC1 VCC CS2 RL2 Rw2
*NC can be left unconnected, or connected to any voltage between VSS and VCC.
Ordering Information
PART NUMBER X93256UV14I-2.7* X93256UV14IZ-2.7* (Note) X93256WV14I-2.7* X93256WV14IZ-2.7* (Note) PART MARKING X93256UVG X93256UZG X93256WVG X93256WZG RTOTAL (k) 50 50 12.5 12.5 TEMPERATURE RANGE (C) -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 14 Ld TSSOP (4.4mm) 14 Ld TSSOP (4.4mm) (Pb-free) 14 Ld TSSOP (4.4mm) 14 Ld TSSOP (4.4mm) (Pb-free) PKG. DWG. # MDP0044 MDP0044 MDP0044 MDP0044
*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.
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X93256
PIN DESCRIPTIONS TSSOP
1 2
Symbol
RW1 RL1
Brief Description
RW1. The RW1 pin of the X93256 is the wiper terminal of the first potentiometer which is equivalent to the movable terminal of a mechanical potentiometer. RL1. The RH1 and RL1 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH1 and RL1 references the relative position of the terminal in relation to wiper movement direction selected by the U/D input. Chip Select 1 (CS1). The first potentiometer is selected when the CS1 input is LOW. The current counter value is stored in nonvolatile memory when CS1 is returned HIGH while the INC1 input is also HIGH. After the store operation is complete, the first potentiometer of the X93256 will be placed in the low power standby mode until the first potentiometer is selected once again. Increment 2 (INC2). The INC2 input is negative-edge triggered. Toggling INC2 will move the wiper of the second potentiometer and either increment or decrement the counter in the direction indicated by the logic level on the U/D2 input. Up/Down 2 (U/D2). The U/D2 input controls the direction of the second potentiometer wiper movement and whether the counter for the second potentiometer is incremented or decremented. RH2. The RH2 and RL2 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH2 and RL2 references the relative position of the wiper terminal for the second potentiometer in relation to the wiper movement direction selected by the U/D2 input. Ground. RW2. The RW2 pin of the X93256 is the wiper terminal of the second potentiometer which is equivalent to the movable terminal of a mechanical potentiometer. RL2. The RH2 and RL2 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH2 and RL2 references the relative position of the wiper terminal for the second potentiometer in relation to the wiper movement direction selected by the U/D2 input. Chip Select 2 (CS2). The second potentiometer is selected when the CS2 input is LOW. The current counter value is stored in nonvolatile memory when CS2 is returned HIGH while the INC2 input is also HIGH. After the store operation is complete, the second potentiometer of the X93256 will be placed in the low power standby mode until the second potentiometer is selected once again. Supply Voltage. Increment 1(INC1). The INC1 input is negative-edge triggered. Toggling INC1 will move the wiper of the first potentiometer and either increment or decrement the counter in the direction indicated by the logic level on the U/D1 input. Up/Down 1 (U/D1). The U/D1 input controls the direction of the first potentiometer wiper movement and whether the counter for the first potentiometer is incremented or decremented. RH1. The RH1 and RL1 pins of the X93256 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC. The terminology of RH1 and RL1 references the relative position of the wiper terminal for the first potentiometer in relation to the wiper movement direction selected by the U/D1 input.
3
CS1
4
INC2
5 6
U/D2 RH2
7 8 9
VSS RW2 RL2
10
CS2
11 12
VCC INC1
13 14
U/D1 RH1
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X93256
ABSOLUTE MAXIMUM RATINGS Temperature under bias .................... -65C to +135C Storage temperature ......................... -65C to +150C Voltage on CS, INC, U/D, RH, RL and VCC with respect to VSS .............................. -1V to +6.5V Lead temperature (soldering 10 seconds) ......... 300C Maximum reflow temperature (40 seconds) ...... 240C Maximum resistor current ..................................... 2mA COMMENT Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; the 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.
RECOMMENDED OPERATING CONDITIONS Temperature Industrial Min.
-40C
Max.
+85C
Supply Voltage (VCC) X93256
Limits 2.7V 5.5%(7)
POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.) Limits Symbol
RTOT VR
Parameter
End to end resistance
Min.
9.375 37.5 0
Typ.
12.5 50
Max.
15.625 62.5 VCC 1
Unit
k k V mW(7) dBV(7) mA % MI(3) MI(3) pF(6)
Test Conditions/Notes
W option (5) U option (5) (5) RTOTAL = 50k (5) (6) Ref: 1kHz (5) (6) (5) (6) (5) (6) (5) VH(n)(actual) - VH(n)(expected) (5) VH(n+1) - [VH(n) + MI] (5) See circuit #2 (5)
RH, RL terminal voltages Power rating Noise
-120 1100 0.6 3 1 0.5 35 10/10/25
RW IW
Wiper Resistance Wiper Current Resolution Absolute linearity(1) Relative linearity(2) RTOTAL temperature coefficient
ppm/C (5) (6)
CH/CL/CW
Potentiometer capacitances
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 = 25C and nominal supply voltage. (5) This parameter only applies to a single potentiometer. (6) Typical parameter is guaranteed by characterization. (7) When performing multiple write operations, VCC must not decrease by more than 150mV from it's initial value.
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X93256
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.) Limits Symbol
ICC1
Parameter
VCC active current (Increment)
Min.
Typ.(4)
50 200
Max.
250 300 600 1400
Unit
A
Test Conditions
CS = VIL, U/D = VIL or VIH and INC = 0.4V @ max. tCYC VCC = 3V CS = VIL, U/D = VIL or VIH and INC = 0.4V @ max. tCYC VCC = 5V
ICC2
VCC active current (Store) (EEPROM Store)
A A A A A A A A V V pF
CS = VIH, U/D = VIL or VIH and INC = VIH @ max. tWR VCC = 3V CS = VIH, U/D = VIL or VIH and INC = VIH @ max. tWR VCC = 5V CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V VCC = 3V CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V VCC = 5V VIN = VCC (5) VCC = 3V, CS = 0 (5) VCC = 5V, CS = 0 (5) VIN = VSS to VCC (5) (5) (5) VCC = 3V, VIN = VSS, TA = 25C, f = 1MHz (6)
ISB
Standby supply current
1 4
ILI ILI ILI ILI VIH VIL CIN
(5)(7)
CS input leakage current CS input leakage current CS input leakage current 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
1 60 120 VCC x 0.7 -0.5 100 200 150 250 1 VCC + 0.5 VCC x 0.1 10
ENDURANCE AND DATA RETENTION Parameter
Minimum endurance Data retention
Min.
200,000 100
Unit
Data changes per bit Years
Test Circuit #1
Test Point VH/RH
Circuit #2 SPICE Macro Model
RTOTAL RH CH 10pF CW 25pF CL 10pF RL
A.C. CONDITIONS OF TEST
Input pulse levels Input rise and fall times Input reference levels 0V to 3V 10ns 1.5V
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X93256
A.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified) Limits Symbol
tCl tlD tDI tlL tlH tlC tCPH tCPH tCYC tR, tF(6) tR VCC(6) tWR
CS to INC setup INC HIGH to U/D change U/D to INC setup INC LOW period INC HIGH period INC Inactive to CS inactive CS Deselect time (NO STORE) CS Deselect time (STORE) INC cycle time INC input rise and fall time VCC power-up rate Store cycle
Parameter
Min.
100 100 100 1 1 1 250 10 2
Typ.(6)
Max.
Unit
ns ns ns s s s ns ms s
500 0.2 5 10,000 10
s V/ms ms
POWER UP AND DOWN REQUIREMENTS There are no restrictions on the power-up or power-down conditions of VCC and the voltages applied to the 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. A.C. TIMING
CS tCYC tCI INC tID tDI tF tIL tIH tIC (Store) tCPH 90% 90% 10% tR
U/D
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X93256
PIN DESCRIPTIONS (In the text, CS, INC, U/D, RH, RW , and RL are used to refer to either CS1 or CS2, etc. Note: These signals can be applied independently or at the same time.) RH and RL The RH and RL pins of the X93256 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 per potentiometer. RW The RW pin of the X93256 is the wiper terminal of the potentiometer which is equivalent to the movable terminal of a mechanical potentiometer Up/Down (U/D) The U/D input controls the direction of a single potentiometer's 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 pertatining potentiometer's counter in the direction indicated by the logic level on the pertaining potentiometer's U/D input. Chip Select (CS) A potentiometer is selected when the pertaining CS input is LOW. Its current counter value is stored in nonvolatile memory when the pertaining CS is returned HIGH while the pertaining INC input is also HIGH. After the store operation is complete the affected potentiometer will be placed in the low power standby mode until the potentiometer is selected once again. PRINCIPLES OF OPERATION There are multiple sections for each potentiometer in the X93256: an input control, a counter and decode section; the nonvolatile memory; and a resistor array. Each 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. Each 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. Each 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 2-terminal 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 for each potentiometer. When power is restored, the contents of the memory are recalled and each wiper is set to the value last stored.
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X93256
INSTRUCTIONS AND PROGRAMMING The INC, U/D and CS inputs control the movement of the pertaining wiper along the resistor array. With CS set LOW the pertaining potentiometer 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 each CS transitions HIGH while the pertaining INC input is also HIGH. In order to avoid an accidental store during power-up, each CS must go HIGH with VCC during initial power-up. When left open, each CS pin is internally pulled up to VCC by an internal 30K resistor. The system may select the X93256, move any 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. 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. The state of U/D may be changed while CS remains LOW. This allows the host system to enable the device and then move each wiper up and down until the proper trim is attained. MODE SELECTION CS
L L H H X L L L
INC
U/D
H L X X X H L
Wiper Up Wiper Down
Mode
Store Wiper Position Standby Current No Store, Return to Standby Wiper Up (not recommended) Wiper Down (not recommended)
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
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FN8188.1 March 24, 2006
X93256 Packaging Information
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
FN8188.1 March 24, 2006

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