CAT5128 32-Tap Digital Up/Down Control Potentiometer
FEATURES
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 Available in SOT-23 8-lead Pb-free package
DESCRIPTION
The CAT5128 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 CAT5128 contains a 32-tap series resistor array connected between two terminals A and B. An up/down counter and decoder that are controlled by two input pins, determines which tap is connected to the wiper, W. Wiper-control of the CAT5128 is ¯¯ accomplished with two input control pins, UP and ¯¯¯¯¯¯. A high-to-low transition on the UP input ¯¯ DOWN increments the wiper position and a high-to-low transition on the ¯¯¯¯¯¯ input decrements the wiper DOWN 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.
APPLICATIONS
Automated 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.
FUNCTIONAL DIAGRAM
5-BIT UP/DOWN COUNTER 31 30
A
A
VCC
A UP UP/DOWN Control DOWN Power On Recall GND B DOWN W VCC
29 ONE 28 OF THIRTY TWO DECODER CONTROL CIRCUITRY 2 1
UP
TRANSFER GATES
RESISTOR ARRAY
W
GND
0
B W
B Electronic Potentiometer Implementation
General
Detailed
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
1
Doc. No. MD-2128 Rev. B
CAT5128
PIN CONFIGURATION
SOT-23 8-Lead
¯¯ UP ¯¯¯¯¯¯ DOWN A GND 1 2 3 4 8 VCC NC B W 7 6 5
PIN DESCRIPTIONS
Name Function ¯¯ Step-Up Control UP ¯¯¯¯¯¯ Step-Down Control DOWN A GND W B NC VCC Potentiometer High Terminal Ground Wiper Terminal Potentiometer Low Terminal Not Connected Supply Voltage
CAT
PIN DESCRIPTION
¯¯ UP: Step-Up Control Input When ¯¯¯¯¯¯ input is high, a high-to-low transition on DOWN ¯¯ UP input will cause the wiper to move one increment toward the A terminal. ¯¯¯¯¯¯: Step-Down Control Input DOWN A high-to-low transition on ¯¯¯¯¯¯ input will cause the DOWN wiper to move one increment towards the B terminal. A: High End Potentiometer Terminal A is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the B terminal. Voltage applied to the A terminal cannot exceed the supply voltage, VCC or go below ground, GND. W: Wiper Potentiometer Terminal W is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the ¯¯ control inputs, UP and ¯¯¯¯¯¯. Voltage applied to the DOWN W terminal cannot exceed the supply voltage, VCC or go below ground, GND. B: Low End Potentiometer Terminal B is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the A terminal. Voltage applied to the B terminal cannot exceed the supply voltage, VCC or go below ground, GND. B and A are electrically interchangeable.
DEVICE OPERATION
The CAT5128 operates like a digitally controlled potentiometer with A and B equivalent to the high and low terminals and W equivalent to the mechanical potentiometer's wiper. There are 32 available tap positions including the resistor end points, A and B. There are 31 resistor elements connected in series between the A and B terminals. The wiper terminal is connected to one of the 32 taps and controlled by two ¯¯ inputs, UP and ¯¯¯¯¯¯. These inputs control a five-bit DOWN up/down counter whose output is decoded to select the wiper position. A high-to-low transition on ¯¯¯¯¯¯ input will DOWN decrement one step the wiper position (RWB will decrease with 1LSB and RWA will increase with 1LSB). If and only if ¯¯¯¯¯¯ input is high, a high-to-low DOWN ¯¯ transition on UP input will increment one step the wiper position (RWB will increase with 1LSB and RWA will decrease with 1LSB). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. When the CAT5128 is powered-down, the wiper position is reset. When power is restored, the counter is set to the mid point, tap 15.
Doc. No. MD-2128 Rev. B
2
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT5128
OPERATION MODES ¯¯ UP High to Low X High High to Low Low High ¯¯¯¯¯¯ DOWN High Low High to Low High to Low X High Operation Wiper toward A – RW Increment Wiper does not change Wiper toward B – RW Decrement Wiper toward B – RW Decrement Wiper does not change Wiper does not change
CB B RB CA A
RA
RW W CW
Potentiometer Equivalent Circuit
ABSOLUTE MAXIMUM RATINGS (1) Parameters Supply Voltage VCC to GND Inputs ¯¯ UP to GND ¯¯¯¯¯¯ to GND DOWN A, B, W to GND Operating Ambient Temperature Industrial (‘I’ suffix) Junction Temperature Storage Temperature Lead Soldering (10 seconds max) Thermal Resistance θJA DC ELECTRICAL CHARACTERISTICS(1) VCC = +2.5V to +5.5V unless otherwise specified Power Supply Symbol VCC ICC1 ISB1(3) Parameter Operating Voltage Range Supply Current (Increment) Supply Current (Standby) VCC = 5.5V, f = 1MHz, IW = 0 VCC = 5.5V, f = 250kHz, IW = 0 ¯¯ DOWN UP, ¯¯¯¯¯¯ = VCC or GND Conditions Min 2.5 – – – Typ – – – 0.01 Max 5.5 100 50 1 Units V µA µA µA -40 to +85 +150 -65 to 150 +300 230 ºC ºC ºC ºC ºC/W -0.5 to VCC +0.5 -0.5 to VCC +0.5 -0.5 to VCC +0.5 V V V -0.5 to +7V V Ratings Units
Notes: (1) Stresses above those listed under “Absolute 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.
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
3
Doc. No. MD-2128 Rev. B
CAT5128
LOGIC INPUTS VCC = +2.5V to +5.5V unless otherwise specified Symbol IIH IIL VIH1 VIL1 VIH2 VIL2 Parameter Input Leakage Current Input Leakage Current TTL High Level Input Voltage TTL Low Level Input Voltage CMOS High Level Input Voltage CMOS Low Level Input Voltage Conditions VIN = VCC VIN = 0V 4.5V ≤ VCC ≤ 5.5V 2.5V ≤ VCC ≤ 5.5V Min – – 2 0 VCC x 0.7 -0.3 Typ – – – – – – Max 10 -10 VCC 0.8 VCC + 0.3 VCC x 0.2 Units µA µA V V V V
POTENTIOMETER CHARACTERISTICS VCC = +2.5V to +5.5V unless otherwise specified Symbol RPOT Parameter Potentiometer Resistance Pot. Resistance Tolerance VA VB INL DNL RWI IW TCRPOT TCRATIO VN
(3)
Conditions -10 Device -50 Device -00 Device
Min
Typ 10 50
(1)
Max
Units kΩ
100 ±20 0 0 3.2 VCC VCC 0.1 0.05 70 150 50 5 8/24 8/8/25 1.7 20 300 1 0.5 0.5 % V V % LSB LSB Ω Ω mA ppm/ºC ppm/ºC nV/√Hz pF MHz
Voltage on A pin Voltage on B pin Resolution Integral Linearity Error Differential Linearity Error Wiper Resistance Wiper Current TC of Pot Resistance Ratiometric TC Noise Potentiometer Capacitances Frequency Response IW ≤ 2µA IW ≤ 2µA VCC = 5V, IW = 1mA VCC = 2.5V, IW = 1mA (2) (3) (3) 100kHz / 1kHz (3) Passive Attenuator, 10kΩ
-0.5 -0.5
CA/CB/CW fc (3)
Notes: (1) Typical values are for TA = 25ºC and nominal supply voltage. (2) IW = source or sink. (3) These parameters are periodically sampled and are not production tested.
Doc. No. MD-2128 Rev. B
4
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT5128
AC CONDITIONS OF TEST VCC Range Input Pulse Levels Input Rise and Fall Times Input Reference Levels 2.5V ≤ VCC ≤ 5.5V 0.2VCC to 0.7VCC 10ns 0.5VCC
AC OPERATING CHARACTERISTICS VCC = +2.5V to +5.5V, VH = VCC, VL = 0V, unless othewise specified Symbol tUP tDOWN tUP_CYC tDOWN_CYC tUP_R, tUP_F tUP_SET tDOWN_SET tPU
(2) (2) (2)
Parameter ¯¯ UP LOW Period ¯¯¯¯¯¯ LOW Period DOWN ¯¯ UP Cycle Time ¯¯¯¯¯¯ Cycle Time DOWN ¯¯ UP Rise and Fall Time ¯¯¯¯¯¯ Rise and Fall Time DOWN ¯¯ UP Settling Time ¯¯¯¯¯¯ Settling Time DOWN Power-up to Wiper Stable
Min 500 500 1 1 – – 200 200 –
Typ – – – – – – – – –
(1)
Max – – – – 500 500 – – 1
Units ns ns µs µs ns ns ns ns ms
tDOWN_R, tDOWN_F
INTERFACE TIMING DIAGRAM
tUP_CYC tUP UP tUP_R
90% 10% 90% 10%
tUP_F
MI(3) tUP_SET RW
Increment RW in Discrete Steps
tDOWN_CYC tDOWN DOWN tDOWN_R
90% 10% 90% 10%
tDOWN_F
tDOWN_SET RW MI(3)
Decrement RW in Discrete Steps
Notes: (1) Typical values are for TA = 25ºC and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. (3) MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position.
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
5
Doc. No. MD-2128 Rev. B
CAT5128
PACKAGE OUTLINE DRAWING
SOT-23 8-Lead (TB) (1)(2)
SYMBOL
MIN
NOM
MAX
A A1 A2
E1 E
0.90 0.00 0.90 0.60 0.28 0.08 2.90 BSC 2.80 BSC 1.60 BSC 0.65 BSC 0.30 0.45 0.60 REF 0.25 REF 0º 1.10
1.45 0.15 1.30 0.80 0.38 0.22
A3 b c D E E1 e L L1 L2 θ
e PIN #1 IDENTIFICATION TOP VIEW
b
0.60
8º
D
A
A3
A2
θ
c
A1 SIDE VIEW
L1
L
L2
END VIEW
For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf.
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC standard MO-178.
Doc. No. MD-2128 Rev. B
6
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT5128
EXAMPLE OF ORDERING INFORMATION (1)
Prefix CAT Device # 5128 Suffix TB I -10 – G T3
Optional Company ID Product Number 5128
Temperature Range I = Industrial (-40ºC to 85ºC) Resistance -10: 10kΩ -50: 50kΩ -00: 100kΩ
Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish G:NiPdAu
Package TB: SOT-23
ORDERING PART NUMBER
Resistance CAT5128TBI-10 CAT5128TBI-50 CAT5128TBI-00
(5)
Package SOT-23-8
10kΩ 50kΩ 100kΩ
For Product Top Mark Codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp
Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) This device used in the above example is a CAT5128TBI-10-GT3 (SOT-23, Industrial Temperature, 10kΩ, NiPdAu, Tape & Reel, 3,000/Reel) . (4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. (5) Contact factory for availability.
© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
7
Doc. No. MD-2128 Rev. B
CAT5128
REVISION HISTORY
Date 19-Mar-08 21-Nov-08 Rev. A B Description Initial Release Change logo and fine print to ON Semiconductor
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC 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 SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
Doc. No. MD-2128 Rev. B
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© 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
