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1 of 10 011806 features replaces mechanical variable resistors electronic interface provided for digital as well as manual control wide differential input voltage range between 4.5 and 8v wiper position is maintained in the absence of power low-cost alternative to mechanical controls applications include vol ume, tone, contrast, brightness, and dimmer control available in 8-pin soic and 8-pin dip packages standard resistance values for dallastat: ds1669-10 ~ 10 k ? ds1669-50 ~ 50 k ? ds1669-100 ~ 100 k ? operating temperature range industrial: -40c to +85c pin assignment ds1669 pin description ds1669 r h - high terminal of potentiometer r w - wiper terminal of potentiometer r l - low terminal of potentiometer -v, +v - voltage inputs uc - up contact input d - digital input dc - down contact input description the ds1669 dallastat is a digital rheostat or potentio meter. this device provides 64 possible uniform tap points over the entire resistive range. the standard resistive ranges are 10 k , 50 k , and 100 k . the dallastat can be controlled by either a switch contact closure input or a digita l source input such as a cpu. wiper position is maintained in the absence of power through the use of a eeprom memory cell array. the eeprom cell array will withstand more than 50,000 writes. the ds1669 is offered in two standard ic packages which include an 8-pin 300-mil dip and an 8-pin 208-mil soic. the ds1669 can be configured to opera te using a single pushbutton, dual pushbutton or digital source input by varying power-on conditions. this is illustrated in figures 1 and 2. the ds1669 pinouts allow access to both ends of the potentiometer r l , r h , and the wiper, r w . control inputs include ds1669 dallastat electronic digital rheostat www.maxim-ic.com +v d c r w -v ( r l ) d uc ( r h ) 8 7 6 5 1 2 3 4 8-pin dip (300-mil) see mech. drawings section 1 2 3 4 8 7 6 5 +v dc r w v- (r l ) d uc (r h ) 8-pin soic (208-mil) see mech. drawings section
ds1669 2 of 10 the digital source input, d, the up contact input, uc, and the down cont act input, dc. other pins include the positive, +v, and negative, -v, supply inputs. the ds1669 is specified to operate from -40c to +85c. operation the ds1669 can be configured to operate from a single c ontact closure, dual contact closure, or a digital source input. figures 1 and 2 illustrate both contact clos ure configurations. contact closure is defined as a transition from a high level to a low level on the up c ontact (uc) or down contact (dc) inputs. all three control inputs are active when in a low stat e and are inactive when in a high state. the ds1669 interprets input pulse widths as the m eans of controlling wiper movement. a single pulse input on the uc, dc, or d input terminals will cause the wiper position to move 1/64 th of the total resistance. a transition from a high to low on these i nputs is considered the begi nning of pulse activity or contact closure. a single pulse mu st be greater than 1 ms but lasting no longer than 1 second. pulse timings are shown in figure 5. repetitive pulsed inputs can be used to step through each resistive position of the device in a relatively fast manner (see figure 5b). the requirement for repe titive pulsed inputs is that pulses must be separated by a minimum time of 1 ms. if the input is not allowe d to be inactive (high) for at least 1 ms, the ds1669 will interpret repetitive pulses as a single pulse. pulse inputs lasting longer than 1 second will cause the wiper to move one position every 100 ms following the initial 1-second hold time. the total time to transcend the entire potentiometer using a continuous input pulse is gi ven by the formula below: 1 second + 63 x 100 ms = 7.3 (seconds) single contact closure operation allows the user to control wiper movement in either direction from a single pushbutton input. figure 1 presents a typical si ngle pushbutton configuration. the uc input is used to increment and decrement wiper position for si ngle pushbutton mode of operation. the dc input provides no functionality in this mode but must be connected to the positive supply voltage (v cc ). the digital source input (d) can be allowed to float. on device power-up, the configuration shown in figure 1 must exist in order to enter the single contact closure mode of operation especially and specifically, the (dc) i nput?s direct connection to the positive supply voltage (v cc ). the initial direction of wiper moveme nt in single pushbutton operation is determined by prior activity. the initial direction of wiper moveme nt will be opposite to that of the previous activity. changing the direction of wiper movement in single pushbutton mode is accomplished by allowing a period of inactivity on the uc input of (greater than) 1 s econd, or by moving the wiper to the end of the potentiometer range. this will occur regardless of wh ether the input is a continuous pulse, a sequence of repetitive pulses or a single pulse. the digital source input, d, was designed for micropr ocessor or controlled app lications. this control input manipulates the device in the same manner as the single pushbutton configuration, controlling movement of the wiper position in both upward and dow nward directions. one added feature over the single pushbutton configuration is the ability to increment or decrement wiper position at a faster rate. digital source input control is available regard less of the type of pushbutton configuration.
ds1669 3 of 10 dual pushbutton mode of operation is entered when th e dc input is floated on power-up. if interfacing contact closure control inputs to digital logic, the dc input must be interfaced to an open drain drive which is high impedance during power-up; see figure 2b. this will prevent the device from entering a single pushbutton mode of operation. in dual pushbutton mode, each direction is controlle d by the up contact (uc) and down contact (dc) inputs, respectively. no wait states are required to change wiper direction in dual pushbutton mode. in dual pushbutton mode, as the wiper position reaches the end of the potentiometer, the direction of wiper movement will not change. wiper position will remain at the potentiometers? end until an opposite direction input is given. all contact closure control i nputs, uc, dc, and d, are internally pulled-up by a 100 k resistance. the uc and dc inputs are internally debounced and re quire no external components for input signal conditioning.
ds1669 4 of 10 ds1669 single pushbutton configuration (typical example) figure 1 ds1669 dual pushbutton configuration (typical application) figure 2a
ds1669 5 of 10 ds1669 dual pushbutton configuration (typical application) figure 2b the ds1669 is provided with two supply inputs -v and +v. the maximum voltage difference between the two supply inputs is +8.0 volts. the minimum voltage difference is +4.5 volts. all input levels are referenced to the negative supply input, -v. the voltage applied to any dallastat terminal must not exceed the negative supply voltage (-v ) by -0.5 or the positive supply voltage (+v) by +0.5 volts. the minimum logic high level must be +2.4 volts with reference to the -v supply voltage input for +v=5v. a logic low level with reference to the -v supply voltage has a maximum value of +0.8 volts. dallastats exhibit a typical wiper resistance of 400 ohms with a max imum wiper resistance of 1000 ohms. the maximum wiper current allowed through the dallastat is specified at 1 milliamps (see dc electrical characteristics). nonvolatile wiper settings dallastats maintain the position of the wiper in the ab sence of power. this feature is provided through the use of eeprom type memory cell arrays. during normal operation the position of the wiper is determined by the input multiplexer. periodica lly, the multiplexer will upda te the eeprom memory cells. the manner in which an update occurs has been optimized for reliability, durability, and performance. additionally, the update operation is totally transparent to the user. when power is applied to the dallastat, the wiper setting will be the last recorded in the eeprom memory cells. if the dallastat setting is changed after power is applied, the new value will be stored after a delay of 2 seconds. the initial storage of a new va lue after power-up occurs when the first change is made, regardless of when this change is made. after the initial change on power-up, subsequent changes in the dallastat eeprom memory cells will occur only if the wiper position of the part is moved greater than 12.5% of the total resistance range. any wiper movement after initial powe r-up which is less than 12.5% will not be recorded in the eeprom memory cells. since the dallastat contains a 64-to -1 multiplexer, a change of greater than 12.5% corresponds to a change of the fourth lsb. changes or storage to the eeprom memory cells mu st allow for a 2-second delay to guarantee that updates will occur. the eeprom memory cells are sp ecified to accept greater than 80,000 writes before a wear-out condition. if the eeprom memory cells do reach a wear-out condition, the dallastat will still function properly while power is applied. however, on power-up the device?s wiper position will be that of the position last recorded before memory cell wear-out.
ds1669 6 of 10 flowchart: one-button operation and electrical control figure 3 contact open and contact closure timing is 1s 15%.
ds1669 7 of 10 flowchart: two-button operation figure 4 contact open and contact closure timing is 1sec. 15%.
ds1669 8 of 10 absolute maximum ratings* voltage on any pin relative to -v -v -0.5v + 8.0v operating temperature -40c to +85c storage temperature -55c to +125c soldering temperature 260c for 15 seconds * this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operati on sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. recommended dc operating conditions (-40c to +85c) parameter symbol min typ max units notes + supply voltage +v -v + 4.5 -v + 8.0 v - supply voltage -v +v - 8.0 +v - 4.5 v rheostat inputs r h ,r w ,r l -v - 0.5 +v + 0.5 v logic input 1 v ih +2.4 v 1, 2 logic input 0 v il +0.8 v 1, 2 dc electrical characteristics: (-40c to +85c; -v to +v = 4.5v to 8.0v) parameter symbol min typ max units notes +, - supply current i cc1 1 2 ma 3 supply current, idle state i cc2 65 a 9 wiper resistance r w 400 1000 wiper current i w 1 ma 5 rheostat current i h , i l 1 ma 5 power-up time t pu 10 s 10 input leakage i li -1 +1 a 1 ac electrical characteristics (-40c to +85c; -v to +v = 4.5v to 8.0v) parameter symbol min typ max units notes digital input pulse width t dpw 1 dc s 1, 7, 8 contact pulse width t cpw 1 dc ms 1, 7, 8 repetitive input pulse high time t hpw 1 dc ms 1, 7, 8 continuous input pulse t ccp 1 dc s 1, 7, 8
ds1669 9 of 10 analog resistor characteristics (-40c to +85c) parameter symbol min typ max units notes end-to-end resistor tolerance -20 +20 % 14 absolute linearity -0.75 +0.75 lsb 11 relative linearity -0.3 +0.3 lsb 12 -3 db cutoff frequency noise figure fcutoff hz 13 temperature coefficient 750 ppm/c capacitance (t a = 25c) parameter symbol min typ max units notes input capacitance c in 5 pf 6 output capacitance c out 7 pf 6 timing diagrams figure 5 t cpw
ds1669 10 of 10 notes: 1. all inputs; uv, dc, and d are internal ly pulled up with a resistance of 100k ? . 2. input logic levels are referenced to -v. 3. i cc is the internal current that flows between -v and +v. 4. input leakage applies to contact input s uc and dc and digital input (d). 5. wiper current and rheostat currents are the maximum currents which can flow in the resistive elements. 6. capacitance values apply at 25c. 7. input pulse width is the minimum time required for an input to cause an increment or decrement. if the uc, dc or d input is held active for longer th an 1 second, subsequent increments or decrements will occur on 100 ms intervals until the input s uc, dc, and/or d is released to v ih . 8. repetitive pulsed inputs on uc, dc, or d will be r ecognized as long as the pulse repetition occurs within 1 second of each other. pulses occurring fa ster than 1 ms apart may not be recognized as individual inputs but can be in terpreted a constant input. 9. idle state supply current is measured with no pushbutton depressed and with the wiper. r w tied to a cmos load. 10. maximum time required for the dalla stat to determine single or du al pushbutton operation after input supply has reached 10% of recomme nded supply operating conditions. 11. absolute linearity is used to dete rmine wiper voltage versus expected voltage as determined by wiper position. 12. relative linearity is used to determine the chan ge in voltage between successive tap positions. 13. -3 db cutoff frequency characteristics for th e ds1669 depend on potentiometer total resistance: ds1669-010; 1 mhz, ds1669-050; 200 khz, ds1669-100; 100 khz. 14. valid at 25 c only.
ds1669 11 of 10 dallas ordering information ds1669-10 10kohm dip ds1669-50 50kohm dip ds1669-100 100kohm dip ds1669-10+ 10kohm dip lead free ds1669-50+ 50kohm dip lead free ds1669-100+ 100kohm dip lead free ds1669s-10 10kohm soic ds1669s-10/t&r 10kohm soic t&r ds1669s-10+ 10kohm soic lead free ds1669s-10+t&r 10kohm soic t&r lead free ds1669s-50 50kohm soic ds1669s-50/t&r 50kohm soic t&r ds1669s-50+ 50kohm soic lead free ds1669s-50+t&r 50kohm soic t&r lead free ds1669s-100 100kohm soic ds1669s-100/t&r 100kohm soic t&r ds1669s-100+ 100kohm soic lead free ds1669s-100+t&r 100kohm soic t&r lead free
english ? ???? ? ??? ? ??? what's new products solutions design appnotes support buy company members ds1669 part number table notes: see the ds1669 quickview data sheet for further information on this product family or download the ds1669 full data sheet (pdf, 180kb). 1. other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales . 2. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 3. part number suffixes: t or t&r = tape and reel; + = rohs/lead-free; # = rohs/lead-exempt. more: see full data sheet or part naming conventions . 4. * some packages have variations, listed on the drawing. "pkgcode/variation" tells which variation the product uses. 5. part number notes free sample buy direct package: type pins size drawing code/var * temp rohs/lead-free? materials analysis ds1669-10+ pdip;8 pin;300 dwg: 56-g5005-000a (pdf) use pkgcode/variation: p8+10 * -40c to +85c rohs/lead-free: yes materials analysis ds1669-100+ 100kohms pdip;8 pin;300 dwg: 56-g5005-000a (pdf) use pkgcode/variation: p8+10 * -40c to +85c rohs/lead-free: yes materials analysis ds1669-10 pdip;8 pin;300 dwg: 56-g5005-000a (pdf) use pkgcode/variation: p8-9 * -40c to +85c rohs/lead-free: no materials analysis ds1669-50 pdip;8 pin;300 dwg: 56-g5005-000a (pdf) use pkgcode/variation: p8-9 * -40c to +85c rohs/lead-free: no materials analysis
ds1669-100 100kohms pdip;8 pin;300 dwg: 56-g5005-000a (pdf) use pkgcode/variation: p8-9 * -40c to +85c rohs/lead-free: no materials analysis ds1669-50+ pdip;8 pin;300 dwg: 56-g5005-000a (pdf) use pkgcode/variation: p8+10 * -40c to +85c rohs/lead-free: yes materials analysis ds1669s-10/t&r/c05 soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis ds1669s-100 100kohms soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis ds1669s-10 soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis ds1669s-50+ soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8+3 * -40c to +85c rohs/lead-free: yes materials analysis ds1669s-50+t&r soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8+3 * -40c to +85c rohs/lead-free: yes materials analysis ds1669s-100+t&r 100kohms soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8+3 * -40c to +85c rohs/lead-free: yes materials analysis ds1669s-100+ 100kohms soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8+3 * -40c to +85c rohs/lead-free: yes materials analysis ds1669s-10+t&r soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8+3 * -40c to +85c rohs/lead-free: yes materials analysis ds1669s-10+ soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8+3 * -40c to +85c rohs/lead-free: yes materials analysis
ds1669s-100/t&r 100kohms soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis ds1669s-50 soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis ds1669s-10/t&r soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis ds1669s-50/t&r soic;8 pin;208 dwg: 56-g4010-001b (pdf) use pkgcode/variation: w8-3 * -40c to +85c rohs/lead-free: no materials analysis didn't find what you need? contact us: send us an email copyright 2007 by maxim integrated products, dallas semiconductor ? legal notices ? privacy policy

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