32-Tap Digital Up/Down Control Potentiometer

Transcription

1 32-Tap Digital Up/Down Control Potentiometer FETURES 32-position linear taper potentiometer Low power CMOS technology Single supply operation: 2.5V 5.5V Discrete step-up/step-down digital control Resistance values: 10kΩ, 50kΩ and 100kΩ vailable in SOT-23 8-lead Pb-free package PPLICTIONS utomated product calibration Remote control adjustments Offset, gain and zero control Tamper-proof calibrations Contrast, brightness and volume controls Motor controls and feedback systems Programmable analog functions For Ordering Information details, see page 7. DESCRIPTION The CT5128 is a single digitally programmable potentiometer (DPP ) designed as an electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment. The CT5128 contains a 32-tap series resistor array connected between two terminals and. n up/down counter and decoder that are controlled by two input pins, determines which tap is connected to the wiper,. iper-control of the CT5128 is accomplished with two input control pins, UP and. DON high-to-low transition on the UP input increments the wiper position and a high-to-low transition on the DON input decrements the wiper position. The tap position is not stored in memory. The wiper is always set to the mid point, tap 15 at power up. The digitally programmable potentiometer can be used as a three-terminal resistive divider or as a two-terminal variable resistor. DPPs bring variability and programmability to a wide variety of applications including control, parameter adjustments, and signal processing. FUNCTIONL DIGRM V 5-IT UP/DON COUNTER UP DON UP/DON Control Power On Recall GND V UP DON GND CONTROL CIRCUITRY ONE 28 OF THIRTY TO DECODER TRNSFER GTES RESISTOR RRY General Detailed Electronic Potentiometer Implementation Catalyst Semiconductor, Inc. 1 Doc. No. MD-2128 Rev.

2 PIN CONFIGURTION SOT-23 8-Lead UP 1 8 V DON 2 7 NC CT 3 6 GND 4 5 PIN DESCRIPTIONS Name Function UP Step-Up Control DON Step-Down Control GND NC V Potentiometer High Terminal Ground iper Terminal Potentiometer Low Terminal Not Connected Supply Voltage PIN DESCRIPTION UP : Step-Up Control Input hen DON input is high, a high-to-low transition on UP input will cause the wiper to move one increment toward the terminal. : DON Step-Down Control Input high-to-low transition on DON input will cause the wiper to move one increment towards the terminal. : High End Potentiometer Terminal is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the terminal. Voltage applied to the terminal cannot exceed the supply voltage, V or go below ground, GND. : iper Potentiometer Terminal is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, UP and. DON Voltage applied to the terminal cannot exceed the supply voltage, V or go below ground, GND. : Low End Potentiometer Terminal is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the terminal. Voltage applied to the terminal cannot exceed the supply voltage, V or go below ground, GND. and are electrically interchangeable. DEVICE OPERTION The CT5128 operates like a digitally controlled potentiometer with and equivalent to the high and low terminals and equivalent to the mechanical potentiometer's wiper. There are 32 available tap positions including the resistor end points, and. There are 31 resistor elements connected in series between the and terminals. The wiper terminal is connected to one of the 32 taps and controlled by two inputs, UP and. DON These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. high-to-low transition on DON input will decrement one step the wiper position (R will decrease with 1LS and R will increase with 1LS). If and only if DON input is high, a high-to-low transition on UP input will increment one step the wiper position (R will increase with 1LS and R will decrease with 1LS). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. hen the CT5128 is powered-down, the wiper position is reset. hen power is restored, the counter is set to the mid point, tap 15. Doc. No. MD-2128 Rev. 2 Catalyst Semiconductor, Inc.

3 OPERTION MODES UP DON Operation High to Low High iper toward R Increment X Low iper does not change High High to Low iper toward R Decrement High to Low High to Low iper toward R Decrement Low X iper does not change High High iper does not change C C R R R C Potentiometer Equivalent Circuit SOLUTE MXIMUM RTINGS Parameters Ratings Units Supply Voltage V to GND -0.5 to +7V V Inputs UP to GND -0.5 to V +0.5 V DON to GND -0.5 to V +0.5 V,, to GND -0.5 to V +0.5 V Operating mbient Temperature Industrial ( I suffix) -40 to +85 ºC Junction Temperature +150 ºC Storage Temperature -65 to 150 ºC Lead Soldering (10 seconds max) +300 ºC Thermal Resistance θ J 230 ºC/ DC ELECTRICL CHRCTERISTICS V = +2.5V to +5.5V unless otherwise specified Power Supply Symbol Parameter Conditions Min Typ Max Units V Operating Voltage Range V I1 Supply Current (Increment) V = 5.5V, f = 1MHz, I = µ V = 5.5V, f = 250kHz, I = 0 50 µ (3) I S1 Supply Current (Standby) UP, DON = V or GND µ Stresses above those listed under bsolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. Catalyst Semiconductor, Inc. 3 Doc. No. MD-2128 Rev.

4 LOGIC INPUTS V = +2.5V to +5.5V unless otherwise specified Symbol Parameter Conditions Min Typ Max Units I Input Leakage Current V = V 10 µ IH IN IIL Input Leakage Current V IN = 0V -10 µ VIH1 TTL High Level Input Voltage 2 V V 4.5V V 5.5V V TTL Low Level Input Voltage V IL1 VIH2 CMOS High Level Input Voltage V x 0.7 V V 2.5V V 5.5V V CMOS Low Level Input Voltage -0.3 V x 0.2 V IL2 POTENTIOMETER CHRCTERISTICS V = +2.5V to +5.5V unless otherwise specified Symbol Parameter Conditions Min Max Units Typ -10 Device 10 RPOT Potentiometer Resistance -50 Device 50 kω -00 Device 100 Pot. Resistance Tolerance ±20 % V Voltage on pin 0 V V V Voltage on pin 0 V V Resolution 3.2 % INL Integral Linearity Error I 2µ LS DNL Differential Linearity Error I 2µ LS R I iper Resistance V = 5V, I = 1m 70 Ω V = 2.5V, I = 1m Ω I iper Current (2) 1 m TCRPOT TC of Pot Resistance (3) 50 ppm/ºc TC RTIO Ratiometric TC (3) 5 20 ppm/ºc V N (3) Noise 100kHz / 1kHz 8/24 nv/ Hz C /C /C Potentiometer Capacitances (3) 8/8/25 pf fc (3) Frequency Response Passive ttenuator, 10kΩ 1.7 MHz Typical values are for T = 25ºC and nominal supply voltage. (2) I = source or sink. (3) These parameters are periodically sampled and are not production tested. Doc. No. MD-2128 Rev. 4 Catalyst Semiconductor, Inc.

5 C CONDITIONS OF TEST V Range 2.5V V 5.5V Input Pulse Levels 0.2V to 0.7V Input Rise and Fall Times 10ns Input Reference Levels 0.5V C OPERTING CHRCTERISTICS V = +2.5V to +5.5V, V H = V, VL = 0V, unless othewise specified Symbol Parameter Min Max Units Typ t UP t DON UP LO Period 500 ns DON LO Period 500 ns tup_cyc UP Cycle Time 1 µs t DON_CYC (2) UP_R, tup_f (2) t t DON_R, t DON_F t UP_SET t DON_SET DON Cycle Time 1 µs UP Rise and Fall Time 500 ns DON Rise and Fall Time 500 ns UP Settling Time 200 ns DON Settling Time 200 ns (2) t Power-up to iper Stable 1 ms PU INTERFCE TIMING DIGRM t UP t UP_CYC t UP_R t UP_F UP 90% 90% 10% 10% t UP_SET MI (3) R Increment R in Discrete Steps t DON t DON_CYC t DON_R t DON_F DON 90% 90% 10% 10% t DON_SET R MI (3) Decrement R in Discrete Steps Typical values are for T = 25ºC and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. (3) MI in the.c. Timing diagram refers to the minimum incremental change in the output due to a change in the wiper position. Catalyst Semiconductor, Inc. 5 Doc. No. MD-2128 Rev.

6 PCKGE OUTLINE DRING SOT-23 8-Lead (T) (2) SYMOL MIN NOM MX e PIN #1 IDENTIFICTION TOP VIE b E1 E b c D 2.90 SC E 2.80 SC E SC e 0.65 SC L L REF L REF θ 0º 8º D 3 2 θ c 1 L1 L L2 SIDE VIE END VIE For current Tape and Reel information, download the PDF file from: ll dimensions are in millimeters. (2) Complies with JEDEC standard MO-178. Doc. No. MD-2128 Rev. 6 Catalyst Semiconductor, Inc.

7 EXMPLE OF ORDERING INFORMTION Prefix Device # Suffix CT 5128 T I -10 G T3 Optional Company ID Product Number 5128 Package T: SOT-23 Temperature Range I = Industrial (-40ºC to 85ºC) Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ Lead Finish G:NiPdu Tape & Reel T: Tape & Reel 3: 3,000/Reel ORDERING PRT NUMER Resistance Package CT5128TI-10 10kΩ CT5128TI-50 50kΩ SOT-23-8 CT5128TI kΩ For Product Top Mark Codes, click here: ll packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdu. (3) This device used in the above example is a CT5128TI-10-GT3 (SOT-23, Industrial Temperature, 10kΩ, NiPdu, Tape & Reel, 3,000/Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. Catalyst Semiconductor, Inc. 7 Doc. No. MD-2128 Rev.

8 REVISION HISTORY Date Rev. Reason 03/19/08 Initial Release Copyrights, Trademarks and Patents Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: daptive nalog, eyond Memory, DPP, EZDim, LDD, MiniPot, Quad-Mode and Quantum Charge Programmable Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. CTLYST SEMICONDUCTOR MKES NO RRNTY, REPRESENTTION OR GURNTEE, EXPRESS OR IMPLIED, REGRDING THE SUITILITY OF ITS PRODUCTS FOR NY PRTICULR PURPOSE, NOR THT THE USE OF ITS PRODUCTS ILL NOT INFRINGE ITS INTELLECTUL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PRTIES ITH RESPECT TO NY PRTICULR USE OR PPLICTION ND SPECIFICLLY DISCLIMS NY ND LL LIILITY RISING OUT OF NY SUCH USE OR PPLICTION, INCLUDING UT NOT LIMITED TO, CONSEQUENTIL OR INCIDENTL DMGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "dvance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender ay Santa Clara, C Phone: Document No: MD-2128 Fax: Revision: Issue date: 03/19/08