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(R)
X9116
Low Noise, Low Power, Low Cost
Data Sheet September 12, 2005 FN8160.1
Digitally Controlled Potentiometer (XDCPTM)
The Intersil X9116 is a digitally controlled nonvolatile potentiometer designed to be used in trimmer applications. The pot consists of 15 equal resistor segments that connect to the wiper pin through programmable CMOS switches. The tap position is programmed through a 3-wire up/down serial port. The last position of the wiper is stored in a nonvolatile memory location which is recalled at the time of power up of the device. The wiper moves through sequential tap positions with inputs on the serial port. A falling edge on INC (bar) causes the tap position to increment one position up or down based on whether the U/D (bar) pin is held high or low. The X9116 can be used in many applications requiring a variable resistance. In many cases it can replace a mechanical trimmer and offers many advantages such as temperature and time stability as well as the reliability of a solid state solution.
Features
* Solid-state nonvolatile * 16 wiper taps * 3-wire up/down serial interface * VCC = 2.7V and 5V * Active current < 50A max. * Standby current < 1A max. * RTOTAL = 10k * Packages: MSOP-8, SOIC * Pb-free plus anneal available (RoHS compliant)
Pinout
SOIC/MSOP INC U/D VH/RH V SS 1 2 X9116 3 4 6 5 8 7 VCC CS VL/RL VW/RW
Block Diagram
VCC (Supply Voltage)
Up/Down (U/D) Increment (INC) Device Select (CS) Control and Memory
RH/VH
RW/VW
RL/VL
VSS (Ground) General RH 13 * 3 2 1 RL 0 RW-RL Resistance 15 14 10k 9.34k 8.68k * k 2.08k 1.42k 760 100
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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.
X9116 Ordering Information
PART NUMBER (BRAND) X9116WM8* X9116WM8Z* (Note) X9116WM8I* X9116WM8IZ* (Note) X9116WS8* X9116WS8Z* (Note) X9116WS8I* X9116WS8IZ* (Note) X9116WM8-2.7* X9116WM8Z-2.7* (Note) X9116WM8I-2.7* X9116WM8IZ-2.7* (Note) X9116WS8-2.7* X9116WS8Z-2.7* (Note) X9116WS8I-2.7* X9116WS8IZ-2.7* (Note) PART MARKING AAZ AKY AFL DCG X9116W X9116W Z X9116W I X9116W Z I AFK AOJ ABA AKS X9116W F X9116W Z F X9116W G X9116W Z G -2.7-5.5 VCC LIMITS (V) 5V 10% RTOTAL (k) 10 TEMPERATURE RANGE (C) 0 to 70 0 to 70 -40 to 85 -40 to 85 0 to 70 0 to 70 -40 to 85 -40 to 85 0 to 70 0 to 70 -40 to 85 -40 to 85 0 to 70 0 to 70 -40 to 85 -40 to 85 PACKAGE 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld MSOP 8 Ld MSOP (Pb-free) 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld SOIC 8 Ld SOIC (Pb-free)
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. *Add "T1" suffix for tape and reel.
Pin Descriptions
VH /RH and VL /RL
The high (VH/RH) and low (VL/RL) terminals of the X9116 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is VSS and the maximum is VCC.
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 X9116 will be placed in the low power standby mode until the device is selected once again.
VW/RW
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 200 to 400 depending upon VCC.
Pin Descriptions
SYMBOL VH/RH VW/RW VL/RL VSS VCC U/D INC CS High Terminal Wiper Terminal Low Terminal Ground Supply Voltage Up/Down Control Input Increment Control Input Chip Select Input DESCRIPTION
Up/Down (U/D)
The U/D input controls the direction of the wiper movement and whether the counter is incremented (up) or decremented (down).
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.
Principles of Operation
There are three sections of the X9116: the input control, counter and decode section; the nonvolatile memory; and
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X9116
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 15 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 pin. 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.
Mode Selection
CS L L H H X L INC U/D H L X X X Wiper Up Wiper Down Store Wiper Position Standby Current No Store, Return to Standby MODE
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
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 four bit counter. The output of this counter is decoded to select one of 16 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 X9116, 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 recalls 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.
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Absolute Maximum Ratings
Temperature under bias . . . . . . . . . . . . . . . . . . . . . .-65C to +135C Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C Voltage on CS, INC, U/D, VH/RH, VL/RL and VCC with respect to VSS . . . . . . . . . . . . . . . . . . . . . -1V to +7V V = |VH/RH-VL/RL| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Lead temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . 300C IW (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.0mA
Recommended Operating Conditions
Temperature Range Commercial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C Industrial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C Supply Voltage (VCC) Limits X9116 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V 10% X9116-2.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
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 Over recommended operating conditions unless otherwise stated
SYMBOL RTOTAL VVH VVL PARAMETER End to end resistance variation VH/RH terminal voltage VL/RL terminal voltage Power rating RW RW IW Wiper resistance Wiper resistance Wiper current Noise Resolution Absolute linearity (Note 1) Relative linearity (Note 2) RTOTAL temperature coefficient Ratiometric temperature coefficient CH/CL/CW 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 = VW(n+1 ) -[Vw(n) + Ml] = 0.2 Ml. 3. 1 Ml = Minimum Increment = RTOT/15. Potentiometer capacitances See Circuit #3 10/10/25 Vw(n)(actual) - Vw(n)(expected) Vw(n+1) - [Vw(n) + MI] -1 -0.2 300 20 Ref: 1kHz VSS = 0V VSS = 0V RTOTAL = 10k IW = 1mA, VCC = 5V IW = 1mA, VCC = 2.7V -5.0 -120 6 +1 +0.2 200 400 TEST CONDITIONS/NOTES MIN -20 VSS VSS TYP MAX +20 VCC VCC 10 400 1000 +5.0 UNIT % V V mW mA dBVHz % MI (Note 3) MI (Note 3) ppm/C ppm/C pF
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X9116
DC Electrical Specifications
SYMBOL ICC1 ICC2 ISB ILI VIH VIL Over recommended operating conditions unless otherwise specified TEST CONDITIONS CS = VIL, U/D = VIL or VIH and INC = 0.4V/2.4V @ 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 VIN = VSS to VCC 2V -0.5 VCC = 5V, VIN = VSS, TA = 25C, f = 1MHz MIN TYP (Note 4) MAX 150 400 1 10 VCC + 0.5 0.8 10 UNIT A A A A V V pF
PARAMETER VCC active current (Increment) VCC active current (Store) (EEPROM Store) Standby supply current CS, INC, U/D input leakage current CS, INC, U/D input HIGH voltage CS, INC, U/D input LOW voltage
CIN (Note 5) CS, INC, U/D input capacitance
4. Typical values are for TA = 25C and nominal supply voltage. 5. This parameter is periodically sampled and not 100% tested.
Endurance And Data Retention
PARAMETER Minimum endurance Data retention MIN 100,000 100 UNIT Data changes per bit Years
Test Circuit #1
Test Circuit #2
Circuit #3 SPICE Macro Model
VH/RH
VH/RH RH
RTOTAL CW 25pF 10pF RW CL 10pF RL
VS
Test Point VW/RW VL/RL
Test Point VWVW /RW V L /RL Force Current
CH
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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DC Electrical Specifications
SYMBOL tCl tlD tDI tlL tlH tlC tCPH tIW tCYC tR, tF (Note 7) tPU (Note 7) tR VCC (Note 7) tWR Over recommended operating conditions unless otherwise specified PARAMETER 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 (STORE) INC to Vw change INC cycle time INC input rise and fall time Power up to wiper stable VCC Power-up rate Store cycle 15 5 4 500 5 50 10 MIN 100 100 2.9 1 1 1 10 1 5 TYP (NOTE 6) MAX UNIT ns ns s s s s ms s s s s mV/s 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, VL, and VW, i.e., VCC VH, VL, VW. The VCC ramp rate spec is always in effect.
A.C. Timing
CS tCYC tCI INC tIL tIH tIC
(store) tCPH 90% 90% 10%
tID
tDI
tF
tR
U/D tIW VW MI (Note 8)
NOTES: 6. Typical values are for TA = 25C and nominal supply voltage. 7. This parameter is not 100% tested. 8. MI in the A.C. timing diagram refers to the minimum incremental change in the VW output due to a change in the wiper position.
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Basic Configurations of Electronic Potentiometers
VR VH VW/RW VR
VL
I Three terminal potentiometer; variable voltage divider Two terminal variable resistor; variable current
Basic Circuits
Buffered Reference Voltage
R1 +V +5V VW VREF + - -5V OP-07 VOUT +V R1 VW/RW X
Cascading Techniques
+V +V
Noninverting Amplifier
+5V VS + - -5V LM308A VO
R2
VOUT = VW/RW
(a) (b)
VW
VO = (1+R2/R1)VS
Voltage Regulator
Comparator with Hysteresis
VIN
317 R1
VO (REG)
VS
LT311A
- + VO
Iadj R2 } R1 } R2
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
VUL = {R1/(R1+R2)} VO(max) VLL = {R1/(R1+R2)} VO(min)
(for additional circuits see AN115)
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X9116 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)
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X9116 Packaging Information
8-Lead Plastic Small Outline Gull Wing Package Type S
0.150 (3.80) 0.158 (4.00) Pin 1 Index
0.228 (5.80) 0.244 (6.20)
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) 0.050 (1.27) 0.010 (0.25)
0.010 (0.25) 0.020 (0.50)
X 45
0.050" Typical
0 - 8 0.0075 (0.19) 0.010 (0.25) 0.016 (0.410) 0.037 (0.937) 0.250"
0.050" Typical
FOOTPRINT
0.030" Typical 8 Places
NOTE: ALL DIMENSIONS IN INCHES (IN PARENTHESES IN 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 9
FN8160.1 September 12, 2005

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