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ISL95310
Digitally Controlled Potentiometer (XDCPTM)
Datasheet May 6, 2005 FN8083.0
Terminal Voltage 0V to 13.2V, 128 Taps Up/Down Interface
The Intersil ISL95310 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 an Up/Down interface. The potentiometer is implemented by a resistor array composed of 127 resistive elements and a wiper switching network. Between each element and at either end are tap points accessible to the wiper terminal. The wiper of each potentiometer has an associated volatile Wiper Counter Register (WR) and a non-volatile Initial Value Register (IVR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper on the resistor array through the switches. At power-up, the device recalls the contents of the default data registers to the corresponding WR. 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 or as a two-terminal variable resistor in a wide variety of applications including: * LCD contrast control * Parameter and bias adjustments * Mechanical potentiometer replacement * Industrial and automotive control
Features
* Non-volatile solid-state potentiometer * Up/down interface with chip select enable * DCP terminal voltage, 0 to +13.2V * 128 wiper tap points - 0.8% resolution - Wiper position stored in nonvolatile memory and recalled on power-up * 127 resistive elements - Temperature compensated - Low wiper resistance 70 typical @ 3.3V * Low power CMOS - Standby current, 2A at VCC = +3.6V * High reliability - Endurance, 200,000 data changes per bit - Register data retention 50 years @ T 75C * RTOTAL values = 10k, 50k * 10-lead MSOP package - Pb-free plus anneal available (RoHS compliant)
Pinout
ISL95310 (10 LD MSOP) TOP VIEW
U/D GND VCC CS
1 2 3 4 5
10 9 8 7 6
INC V+ RL RW RH
Ordering Information
PART NUMBER ISL95310WIU10Z (See Note) ISL95310UIU10Z (See Note) RESISTANCE OPTION () 10K 50K TEMP RANGE (C) -40 to +85 -40 to +85 PACKAGE 10 Ld MSOP (Pb-Free) 10 Ld MSOP (Pb-Free)
NC
Add "-TK" suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pbfree 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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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | 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.
ISL95310 Block Diagram
U/D VCC V+ INC CS Up/Down (U/D) Increment (INC) Device Select (CS) RL STORE AND RECALL CONTROL CIRCUITRY CONTROL AND MEMORY RW 7-BIT UP/DOWN COUNTER 127 126 125 7-BIT NONVOLATILE MEMORY 124 ONE OF 128 DECODER 2 GND SIMPLE BLOCK DIAGRAM 1 0 RL RW DETAILED BLOCK DIAGRAM RH
RH
TRANSFER GATES
RESISTOR ARRAY
Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 SYMBOL U/D GND VCC CS NC RH RW RL V+ INC DESCRIPTION Controls the direction of wiper movement and whether the counter is incremented or decremented Ground Positive logic supply voltage Chip select; the device is selected when the CS input is LOW; also used to initiate a nonvolatile store No connect; pin is to be left unconnected A fixed terminal for one end of the potentiometer resistor The wiper terminal which is equivalent to the movable terminal of a potentiometer A fixed terminal for one end of the potentiometer resistor Positive bias voltage for the potentiometer wiper control Increment input; negative edge triggered
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ISL95310
Absolute Maximum Ratings
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C Voltage on CS, INC, U/D with respect to GND . . . . . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V Voltage on V+ (referenced to GND) . . . . . . . . . . . . . . . . . . . . +13.2V V = |V(RH)-V(RL)| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V+ RH, RL, RW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V+ Lead temperature (soldering 10s) . . . . . . . . . . . . . . . . . . . . . +300C IW (10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6mA VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V Power rating of each DCP . . . . . . . . . . . . . . . . . . . . . . . . . . . .20mW
Recommended Operating Conditions
Temperature Range (Industrial) . . . . . . . . . . . . . . . . .-40C to +85C VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 13.2V Wiper current of each DCP . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0mA
CAUTION: 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.
Analog Specifications Over recommended operating conditions unless otherwise stated.
SYMBOL RTOTAL PARAMETER RH to RL resistance W option U option RH to RL resistance tolerance VRH RW CH/CL/CW ILkgDCP RH terminal voltage Wiper resistance Potentiometer Capacitance (Note 13) Leakage on DCP pins Voltage at pin from GND to V+ VRL = 0V V+ = 12V, wiper current = V+ / RTOTAL -20 0 70 10/10/ 25 0.1 1 TEST CONDITIONS MIN TYP (Note 1) 10 50 +20 V+ 200 MAX UNIT k k % V pF A
VOLTAGE DIVIDER MODE (0V @ RL; V+ @ RH; measured at RW, unloaded) INL (Note 6) DNL (Note 5) ZSerror (Note 3) FSerror (Note 4) Integral non-linearity Differential non-linearity W option U option Zero-scale error U option W option Full-scale error U option W option DCP register set to 40 hex -1 -0.75 -0.5 0 0 -7 -2 1 0.5 -1 -1 4 1 0.75 0.5 7 2 0 0 LSB (Note 2) LSB (Note 2) LSB (Note 2) LSB (Note 2) ppm/C
TCV (Note 7) Ratiometric Temperature Coefficient
RESISTOR MODE (Measurements between RW and RL with RH not connected, or between RW and RH with RL not connected) RINL (Note 11) RDNL (Note 10) Roffset (Note 9) Integral non-linearity Differential non-linearity DCP register set between 20 hex and 7F hex; monotonic over all tap positions W option U option Offset DCP Register set to 00 hex, W option DCP Register set to 00 hex, U option TCR (Note 12) Resistance Temperature Coefficient DCP register set between 20 hex and 7F hex -1 -0.75 -0.5 0 0 1 0.5 45 1 0.75 0.5 7 2 MI (Note 8) MI (Note 8) MI (Note 8) MI (Note 8) ppm/C
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ISL95310
Operating Specifications Over the recommended operating conditions unless otherwise specified.
SYMBOL ICC1 ICC2 ISB PARAMETER TEST CONDITIONS MIN TYP (Note 1) MAX 1 3 5 2 1 -10 10 1 60 120 100 200 150 250 1 1 1.8 0.2 VCC above Vpor, to DCP initial value register recall completed, and 2-wire Interface in standby state 3 2.6 UNIT mA mA A A A A A A A A s V V/ms ms
VCC supply current, volatile write/read CS = VIL, U/D = VIL or VIH and INC = 0.4V/2.4V min; tCYC RL, RH, RW not connected VCC supply current, nonvolatile write VCC current, standby CS = VIL, U/D = VIL or VIH and INC = 0.4V/2.4V min; tCYC RL, RH, RW not connected VCC = +5.5V, 2-wire interface in standby state VCC = +3.6V, 2-wire interface in standby state
IV+ ILkgDig ILI
V+ bias current Leakage current, at pins INC, CS, U/D, A0, and A1 pins CS input leakage current
V+ = 13.2V; VCC = +5.5V Voltage at pin from GND to VCC VIN = VCC VCC = 3V, CS = 0 VCC = 5V, CS = 0
IV+ tDCP (Note 13) Vpor (Note 13) VCC Ramp (Note 13) tD (Note 13)
V+ bias current DCP wiper response time Power-on recall voltage VCC ramp rate Power up delay
V+ = 13.2V; VCC = +5.5V INC falling edge of last bit of DCP data byte to wiper change Minimum VCC at which memory recall occurs
EEPROM SPECS EEPROM endurance EEPROM retention SERIAL INTERFACE SPECS VIL VIH Hysteresis (Note 13) Cpin (Note 13) INC, CS, and U/D INC, CS, and U/D INC, CS, and U/D input buffer hysteresis INC, CS, and U/D pin capacitance -0.3 0.7* VCC 0.05* VCC 10 0.3* VCC VCC+ 0.3 V V V pF Temperature 75C 150,000 50 Cycles Years
AC Electrical Specifications
SYMBOL tCl tlD (Note 13) tDI (Note 13) tlL tlH tlC CS to INC setup
VCC = 5V 10%, TA = Full Operating Temperature Range unless otherwise stated PARAMETER MIN 100 100 1 1 1 1 TYP (Note 4) MAX UNIT ns ns s s s s
INC HIGH to U/D change U/D to INC setup INC LOW period INC HIGH period INC inactive to CS inactive
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ISL95310
AC Electrical Specifications
SYMBOL tCPHS tCPHNS (Note 13) tIW (Note 13) tCYC tR, tF (Note 13) NOTES: 1. Typical values are for TA = 25C and 3.3V supply voltage. 2. LSB: [V(RW)127 - V(RW)0]/127. V(RW)127 and V(RW)0 are V(RW) for the DCP register set to 7F hex and 00 hex respectively. LSB is the incremental voltage when changing from one tap to an adjacent tap. 3. ZS error = V(RW)0 /LSB. 4. FS error = [V(RW)127 - V+]/LSB. 5. DNL = [V(RW)i - V(RW)i-1]/LSB-1, for i = 1 to 127. i is the DCP register setting. 6. INL = V(RW)i - (i * LSB - V(RW)0) for i = 1 to 127. Max ( V ( RW ) i ) - Min ( V ( RW ) i ) 10 6 7. TC V = ------------------------------------------------------------------------------------------------ x ---------------[ Max ( V ( RW ) i ) + Min ( V ( RW ) i ) ] 2 125C for i = 16 to 120 decimal, T = -40C to 85C. Max( ) is the maximum value of the wiper voltage and Min ( ) is the minimum value of the wiper voltage over the temperature range. 8. MI = |R127 - R0| /127. R127 and R0 are the measured resistances for the DCP register set to 7F hex and 00 hex respectively. 9. Roffset = R0/MI, when measuring between RW and RL. Roffset = R127/MI, when measuring between RW and RH. 10. RDNL = (Ri - Ri-1)/MI, for i = 16 to 127. 11. RINL = [Ri - (MI * i) - R0]/MI, for i = 16 to 127. 6 [ Max ( Ri ) - Min ( Ri ) ] 10 12. TC = ------------------------------------------------------------------ x ---------------R [ Max ( Ri ) + Min ( Ri ) ] 2 125C for i = 16 to 127, T = -40C to 85C. Max( ) is the maximum value of the resistance and Min ( ) is the minimum value of the resistance over the temperature range. 13. This parameter is not 100% tested. 14. tWC is the minimum cycle time to be allowed for any non-volatile Write by the user, unless Acknowledge Polling is used. It is the time from a valid STOP condition at the end of a Write sequence of a 3-wire serial interface Write operation, to the end of the self-timed internal non-volatile write cycle. CS deselect time (STORE) CS deselect time (NO STORE) INC to RW change INC cycle time INC input rise and fall time 4 500 VCC = 5V 10%, TA = Full Operating Temperature Range unless otherwise stated (Continued) PARAMETER MIN 20 1 100 500 TYP (Note 4) MAX UNIT ms s s s s
Symbol Table
WAVEFORM INPUTS Must be steady OUTPUTS Will be steady
May change from Low to High May change from High to Low
Will change from Low to High Will change from High to Low
Don't Care: Changes Allowed
Changing: State Not Known
N/A
Center Line is High Impedance
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FN8083.0 May 6, 2005
ISL95310 A.C. Timing
CS tCYC tCI INC tIL tIH tIC tCPHS 90% 10% tID tDI tF tR 90% tCPHNS
U/D tIW RW MI (3)
Power Up and Down Requirements
In order to prevent unwanted tap position changes, or an inadvertent store, bring the CS and INC high before or concurrently with the VCC pin on power-up. 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 1ms after VCC reaches its final value. The VCC ramp spec is always in effect.
CS is returned HIGH while the INC input is also HIGH. After the store operation is complete the ISL95310 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 ISL95310: 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 127 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. 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.
Pin Descriptions
RH and RL
The high (RH) and low (RL) terminals of the ISL95310 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.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement and whether the counter is 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 6
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ISL95310
On applying power to the ISL95310, the VCC supply should have a monotonic ramp to the specified operating voltage. It is important that once VCC reaches 1V that it increases to at least 2.5V in less than 7.5ms (0.2V/ms). The ramp rate before and after these thresholds is not important. VCC must be applied prior to, or simultaneously, with V+. Under no condition should V+ be applied without VCC. While the sequence of applying V+ and VCC to the ISL95310 does not affect the proper recall of the wiper position, applying V+ before VCC powers the electronic switches of the DCP before the electronic switch control signals are applied. This can result in multiple electronic switches being turned on, which could load the power supply and cause brief, unexpected potentiometer wiper settings. To prevent unknown wiper positions on the ISL95310 on power down, it is recommended that V+ turn off before or simultaneously with VCC. If V+ remains on after VCC turns off, the wiper position can remain unchanged from its previous setting or it can go to an undefined state.
TABLE 1. MODE SELECTION CS L L H H X L H H L L INC U/D H L X X X X H L Wiper up Wiper down Store wiper position Standby current No store, return to standby Standby Wiper up one position (not recommended) Wiper down one position (not recommended) MODE
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 seven bit counter. The output of this counter is decoded to select one of one hundred 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 ISL95310, 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. 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. During initial power-up CS must go high along with or before VCC to avoid an accidental store generation.
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ISL95310 Packaging Information
10 Lead MSOP, Package Code
0.0106 [0.27] 0.0067 [0.17] 10 9 8 7 6 0.0106 [0.27] 0.0067 [0.17] WITH PLATING (S) 0.0091 [0.23] 0.0051 [0.13] WITH PLATING 0.0080 [0.203] REF 0.0050 [0.127] 4 4
0.1970 [5.00] 0.1890 [4.80]
1
2
3
4
5
BASE METAL
0.0197 [0.50] BSC
SECTION A-A 0.1220 [3.10] 0.1142 [2.90] 0.0433 [1.10] MAX. 2 0.0374 [0.95] 0.0295 [0.75] 0.0098 [0.25] GAUGE PLANE 0.1220 [3.10] 0.1142 [2.90] 3 A
0.1220 [3.10] 0.0059 [0.15] 0.0020 [0.05] 0.0039 [0.10] MAX. (S) 0.1142 [2.90] (S) 0.0276 [0.70] 0.0157 [0.40]
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0-6 A
NOTES: 1. Package dimensions conform to JEDEC specification MO-187BA. 2.
2 Does not include mold flash, protrusion or gate burrs, mold flash protrusions or gate burrs shall not exceed 0.15 mm per side. 3 4
3. 4.
Does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.15 mm per side. Does not include dambar protrusion. Allowable dambar protrusion shall be 0.8 mm.
5. Lead span/stand-off height/coplanarity are considered as special characteristics. 6. Controlling dimensions in inches [mm].
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
FN8083.0 May 6, 2005

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