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X93155
Data Sheet September 26, 2005 FN8181.1
Digitally Controlled Potentiometer (XDCPTM)
The Intersil X93155 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
Features
* Solid-state potentiometer * Up/Down interface * 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 25% - Terminal voltage, 0 to VCC * Low power CMOS - VCC = 5V10% - Active current, 200A typ. - Standby current, 2.0A max * High reliability - Endurance 200,000 data changes per bit - Register data retention, 100 years * RTOTAL value = 50k * Packages - 8 Ld MSOP * Pb-free plus anneal available (RoHS compliant)
Ordering Information
PART NUMBER X93155UM8I* X93155UM8IZ* (Note) PART RTOTAL TEMP MARKING (k) RANGE (C) PACKAGE AGM DCH 50 50 -40 to 85 -40 to 85 8 Ld MSOP 8 Ld MSOP (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.
Pinout
X93155 (8 LD MSOP) TOP VIEW
8 7 6 5
INC U/D RH VSS
1 2 3 4
VCC CS RL 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 or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
X93155 Block Diagram
VCC (Supply Voltage) U/D INC CS 5-Bit Up/Down Counter 31 30 29 5-Bit Nonvolatile Memory 28 One of Thirty Two Decoder 2 1 VCC VSS (Ground) VSS General Detailed RL 0 RH
30k
Up/Down (U/D) Increment (INC) Device Select (CS) Control and Memory
RH
Transfer Gates
Resistor Array
RL
Store and Control Recall Circuitry
Pin Descriptions
MSOP 1 2 3 4 5 6 7 SYMBOL INC U/D RH VSS NC RL CS BRIEF DESCRIPTION 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. Up/Down (U/D). The U/D input controls the direction of the wiper movement and whether the counter is incremented or decremented. RH. The RH and RL pins of the X93155 are equivalent to the end terminals of a variable resistor. Ground. No Connection. (or can be connected to any voltage between VSS and VCC.) RL. The RH and RL pins of the X93155 are equivalent to the end terminals of a variable resistor. 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 X93155 will be placed in the low power standby mode until the device is selected once again. Supply Voltage.
8
VCC
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X93155
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
Recommended Operating Conditions
Temperature Range Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C Supply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V 10%(7)
CAUTION: 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.
Potentiometer Specifications
SYMBOL RTOT VR End to end resistance RH, RL terminal voltages Power rating Noise IR Potentiometer Current Resolution Absolute linearity(1) Relative linearity(2)
Over recommended operating conditions unless otherwise stated. TEST CONDITIONS/NOTES MIN 37.5 0 RTOTAL =50k Ref: 1kHz (5) 3 RH(n)(actual)-RH(n)(expected) RH(n+1)-[RH(n)+MI] (6) See circuit #2 35 10/10/25 1 0.5 -120 0.6 TYP 50 MAX 62.5 VCC 1 UNIT k V mW(6) dBV(6) mA % MI(3) MI(3) ppm/C pF(6)
PARAMETER
RTOTAL temperature coefficient CH/CL/CW Potentiometer capacitances
Notes: (1) Absolute linearity is utilized to determine actual wiper resistance versus expected resistance = (RH(n)(actual)-RH(n)(expected)) = 1 Ml Maximum. n = 1 .. 29 only (2) Relative linearity is a measure of the error in step size between taps = RH(n+1)--[RH(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 is periodically sampled and not 100% tested (6) This parameter is not 100% tested. (7) When performing multiple write operations, VCC must not decrease by more than 150mV from its initial value.
DC Electrical Specifications
SYMBOL ICC1 ICC2 ISB ILI ILI ILI VIH VIL CIN(5)(7)
Over recommended operating conditions unless otherwise specified. TEST CONDITIONS CS = VIL, U/D = VIL or VIH and INC = 0.4V @ max. tCYC CS = VIH, U/D = VIL or VIH and INC = VIH @ max. tWR CS = VCC - 0.3V, U/D and INC = VSS or VCC - 0.3V VCS = VCC VCC = 5V, CS = 0 VIN = VSS to VCC VCC x 0.7 -0.5 VCC = 5V, VIN = VSS, TA = 25C, f = 1MHz 120 200 MIN TYP (4) 200 MAX 300 1400 2.0 1 250 1 VCC + 0.5 VCC x 0.1 10 UNIT A A A A A A V V pF
PARAMETER VCC active current (Increment) VCC active current (Store) (EEPROM Store) Standby supply current CS 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
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X93155
Endurance and Data Retention
PARAMETER Minimum endurance Data retention MIN 200,000 100 UNIT Data changes per bit Years
RH CH CW 25pF Test Point VH/RH 10pF RTOTAL CL 10pF RL
Circuit #2 SPICE Macro Model
Test Circuit #1
A.C. Conditions of Test
VL
Input pulse levels Input rise and fall times Input reference levels
0V to 5V 10ns 1.5V
AC Electrical Specifications
SYMBOL tCl tlD tDI tlL tlH tlC tCPH tCPH tCYC tR, tF(6) tR VCC(6) tWR CS to INC setup
Over recommended operating conditions unless otherwise specified. PARAMETER MIN 100 100 100 1 1 1 250 10 2 500 1 5 10,000 10 TYP (6) MAX UNIT ns ns ns s s s ns ms s s V/ms ms
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
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.
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X93155 A.C. Timing
CS tCYC tCI INC tIL tIH tIC
(Store) tCPH 90% 10% 90%
tID
tDI
tF
tR
U/D
Pin Descriptions
RH and RL
The RH and RL pins of the X93155 are equivalent to the end terminals of a variable resistor. 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.
point to the wiper. The wiper is connected to the RL terminal, forming a variable resistor from RH to RL. 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 up to 10s. 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. When power is restored, the contents of the memory are recalled and the wiper is set to the value last stored.
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.
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 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 left open, the CS pin is internally pulled up to VCC by an internal 30k resistor. The system may select the X93155, 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
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 X93155 will be placed in the low power standby mode until the device is selected once again.
Principles of Operation
There are three sections of the X93155: 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 5
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X93155
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 the wiper up and down until the proper trim is attained.
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
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 Store Wiper Position Standby Current No Store, Return to Standby Wiper Up (not recommended) Wiper Down (not recommended)
VR
MODE
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.
I
Two terminal variable resistor.
Low Voltage High Impedance Instrumentation Amplifier
5V 10K + + U1A 50K VIN X93155 (RTOTAL) + 50K 10K + U1B 50K 10K GAIN = 50K 50K ) ( 1+ 10K RTOTAL U1C VOUT 10K 50K
U1 = LT1467
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X93155
Micro-Power LCD Contrast Control
5V 300K 240K + 100K + 50K 100K -15V U1A 5V 100K U1B VOUT = -4.41 ( 1 + 100K ) 50K + RTOTAL
VOUT = -8.82V TO -13.23V U1 = LMC6042
X93155(RTOTAL)
Single Supply Variable Gain Amplifier
5V 5V + 20K VIN 10K X93155 (RTOTAL) U1 VOUT GAIN = RTOTAL 10K
20K
U1 = LMC6042
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X93155 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)
7 Typ.
0.040 0.002 (1.02 0.05)
0.008 (0.20) 0.004 (0.10)
0.0256" Typical
0.007 (0.18) 0.005 (0.13)
0.150 (3.81) Ref. 0.193 (4.90) Ref.
0.025" Typical 0.220"
FOOTPRINT
0.020" Typical 8 Places
NOTE: 1. ALL DIMENSIONS IN INCHES AND (MILLIMETERS)
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 8
FN8181.1 September 26, 2005

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