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| DS1804 NV Trimmer Potentiometer www.maxim-ic.com FEATURES Single 100-position taper potentiometer Nonvolatile (NV) on-demand wiper storage Operates from 3V or 5V supplies Up/down, increment-controlled interface Available in 8-pin (300mil) DIP, 8-pin (150mil) SO, 8-pin (118mil) SOP, and flipchip packages Operating Temperature: - Industrial: -40C to +85C Standard Resistance Values: - DS1804-010 10kW - DS1804-050 50kW - DS1804-100 100kW PIN ASSIGNMENT INC U/D H GND 1 2 3 4 8 7 6 5 VCC CS L W 8-Pin DIP (300mil) 8-Pin SO (150mil) 8-Pin SOP (118mil) 8-Pin Flip-Chip Package See Mech. Drawings Section PIN DESCIPTION H L W VCC CS U/ D INC GND - High-Terminal of Potentiometer Low-Terminal of Potentiometer Wiper of Potentiometer 3V or 5V Power Supply Chip Select Up/Down Control Increment/Decrement Wiper Control Ground DESCRIPTION The DS1804 NV trimmer potentiometer is a nonvolatile digital potentiometer that has 100 positions. The device provides an ideal method for low-cost trimming applications using a CPU or manual control input with minimal external circuitry. Wiper position of the DS1804 can be stored in EEPROM memory on demand. The device's wiper position is manipulated by a three-terminal port that provides an increment/ decrement counter controlled interface. This port consists of the control inputs CS , INC , and U/ D . The DS1804 is available in three resistor grades, which include a 10kW, 50kW, and 100kW. The device is provided in an industrial temperature grade. Additionally, the DS1804 will operate from 3V or 5V supplies and is ideal for portable application requirements. Three packaging options are available and include the 8-pin (300mil) DIP, 8-pin (150mil) SO, 8-pin (118mil) SOP, and the flip-chip package. 1 of 8 043002 DS1804 OPERATION The DS1804 is a single nonvolatile potentiometer. The device has a total of 100 tap-points including the L- and H- terminals. A total of 99 resistive segments exist between the L- and H- terminals. These tappoints are accessible to the W-terminal, whose position is controlled via a three-terminal control port. A block diagram of the DS1804 is shown in Figure 1. The three-terminal port of the DS1804 provides an increment/decrement interface which is activated via a chip-select input. This interface consists of the input signals CS , INC , and U/ D . These input signals control a 7-bit up/down counter. The output of the 7-bit up/down counter controls a 1 of 100 decoder to select wiper position. Additionally, this interface provides for a wiper storage operation using the CS and INC input control pins. The timing diagram for the three-terminal interface control is shown in Figure 2. PIN DESCRIPTIONS VCC - Power Supply. The DS1804 will support supply voltages ranging from +2.7V to +5.5V. GND - Ground. H - High-Terminal Potentiometer. This is the high terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the L-terminal. Voltage applied to the H-terminal cannot exceed the power-supply voltage, VCC, or go below ground. L - Low-Terminal Potentiometer. This is the low terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the H-terminal. Voltage applied to the L-terminal cannot exceed the power-supply voltage, VCC, or go below ground. W - Wiper of the Potentiometer. This pin is the wiper of the potentiometer. Its position on the resistor array is controlled by the three-terminal control port. Voltage applied to the wiper cannot exceed the power-supply voltage, VCC, or go below ground. - Chip Select. The CS input is used to activate the control port of the DS1804. This input is active low. When in a high-state, activity on the INC and U/ D port pins will not affect or change wiper position. CS - Wiper Movement Control. This input provides for wiper position changes when the CS pin is low. Wiper position changes of the W-terminal will occur one position per high-to-low transition of this input signal. Position changes will not occur if the CS pin is in a high state. INC U/ D - Up/Down Control. This input sets the direction of wiper movement. When in a high state and CS is low, any high-to-low transition on INC will cause a one position movement of the wiper towards the H-terminal. When in a low state and CS is low, any high-to-low transitions on INC will cause the position of the wiper to move towards the L-terminal. 2 of 8 DS1804 DS1804 BLOCK DIAGRAM Figure 1 POWER-UP/POWER-DOWN CONDITIONS On power-up, the DS1804 will load the value of EEPROM memory into the wiper position register (or 1 of 100 decoder). The value of this register can then be set to another wiper position if desired, by using the three-terminal control port. On power-up, wiper position will be loaded within a maximum time period of 500ms once the power-supply is stable. Additionally, the three-terminal interface port will be active after 50ms. On power-down, the wiper position register data will be lost. On the next device power-up, the value of EEPROM memory will be loaded into the wiper position register. On shipment from the factory, Dallas Semiconductor does not guarantee a specified EEPROM memory value. This value should be set by the customer as needed. NONVOLATILE WIPER STORAGE Wiper position of the DS1804 can be stored using the INC and CS inputs. Storage of the wiper position takes place whenever the CS input transitions from low-to-high while the INC is high. Once this condition has occurred the value of the current wiper position will be written to EEPROM memory. The DS1804 is specified to accept 50,000 writes to EEPROM before a wear-out condition. After wear-out the DS1804 will still function and wiper position can be changed during powered conditions using the three-terminal control port. However, on power-up the wiper-position will be indeterminate. ONE-TIME PROGRAMMABILITY (OTP) The DS1804 can be easily used as an OTP device. The user of the DS1804 can trim the desired value of the wiper position and set this position for storage as described above. Any activity through the threeterminal port can then be prevented by connecting the CS input pin to VCC. Also, an OTP application does not adversely affect the number of times EEPROM is written, since EEPROM will only be loaded and not written during a power-up or power-down condition. On power-up, the DS1804 will load the current value of EEPROM memory into the wiper position register. 3 of 8 DS1804 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature -1.0V to +7.0V -40C to +85C -55C to +125C See IPC/JEDEC J-STD-020A Specification * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. 1) Insert A (Burn-in Disclaimer) The Dallas Semiconductor DS1804 is built to the highest quality standards and manufactured for long term reliability. All Dallas Semiconductor devices are made using the same quality materials and manufacturing methods. However, the flip-chip package version of the DS1804 is not exposed to environmental stresses, such as burn-in, that some industrial applications require. For specific reliability information on this product, please contact the factory in Dallas at 972-371-4448. RECOMMENDED DC OPERATING CONDITIONS PARAMETER Supply Voltage Input Logic 1 Input Logic 0 Resistor Inputs SYMBOL VCC VIH VIL L,H,W MIN +2.7 2.0 -0.5 GND - 0.5 TYP MAX 5.5 VCC + 0.5 +0.8 +0.6 VCC + 0.5 (-40C to +85C) UNITS V V V V NOTES 1 1,2 1,15 1,3 DC ELECTRICAL CHARACTERISTICS PARAMETER Supply Current Input Leakage Wiper Resistance Wiper Current Standby Current: 3 Volts 5 Volts Wiper Load Time Power-Up Time SYMBOL ICC ILI RW IW ISTBY tWLT tPU -1 MIN (-40C to +85C; VCC= 2.7V to 5.5V) TYP MAX 400 +1 400 1000 1 10 20 500 50 40 UNITS A A W NOTES 4 mA A A s ms 5 6 14 4 of 8 DS1804 ANALOG RESISTOR CHARACTERISTICS (-40C to +85C; VCC= 2.7V to 5.5V) PARAMETER End-to-End Resistor Tolerance Absolute Linearity Relative Linearity -3dB Cutoff Frequency Temperature Coefficient fcutoff 750 SYMBOL MIN -20 0.6 0.25 TYP MAX +20 UNITS % LSB LSB MHz ppm/C NOTES 8 9 10 11 CAPACITANCE PARAMETER Input Capacitance Output Capacitance SYMBOL CIN COUT MIN TYP (25C; VCC= 2.7V to 5.5V) MAX 5 7 UNITS pF pF NOTES 12 12 AC ELECTRICAL CHARACTERISTICS PARAMETER CS to INC (-40C to +85C; VCC= 2.7V to 5.5V) TYP MAX UNITS ns ns ns ns ns ns 200 500 ns s ns 10 ms NOTES 13 13 13 13 13 13 13 13 16 13, 17 SYMBOL tCI tDI tIL tIH tIC tCPH tIW tR , tF tIK tWST MIN 50 100 50 100 500 100 Setup U/ D to INC Setup INC INC INC CS Low Period High Period inactive to CS Inactive Deselect Time Wiper Change to INC Low INC INC Rise and Fall Times Low to CS Inactive 50 Wiper Storage Time 5 of 8 DS1804 NOTES: 1) All voltages are referenced to ground. 2) Valid for VCC = 5V only. 3) Resistor input voltages cannot go below ground or exceed VCC by the amounts as shown in the table. 4) Maximum current specifications are based on the clock rate of INC input. This specification represents the current required when changing the wiper position. 5) Standby current levels apply when all inputs are driven to appropriate supply levels. CS , INC , U/ D = VCC. 6) Wiper load time is specified as the time required for the DS1804 to load the wiper position with the contents of nonvolatile memory once VCC has reached a stable operating voltage equal to or greater than 2.7V. 7) The DS1804 is available in three resistor values. These include the DS1804-010, 10kW; the DS1804050, 50kW; and the DS1804-100, 100kW. 8) Valid at 25C only. 9) Absolute linearity is used to compare measured wiper voltage versus expected wiper voltage as determined by wiper position. The DS1804 is specified to provide an absolute linearity of 0.60 LSB. 10) Relative linearity is used to determined the change in voltage between successive tap positions. The DS1804 is specified to provide a relative linearity specification of 0.25 LSB. 11) -3dB cutoff frequency characteristics for the DS1804 depend on potentiometer total resistance. DS1804-010, 1MHz; DS1804-050, 200 kHz; and DS1804-100, 100 kHz. 12) Capacitance values apply at 25C. 13) See Figure 2. 14) Power-up time is specified as the time required before the three-terminal control becomes active after a stable power supply level has been reached. 15) At VCC = 2.7V, VIL = 0.8V. 16) The INC low to CS inactive is specified to be 50ns minimum. This is the transition condition which allows the DS1804 three-terminal port to become inactive without writing the EEPROM memory of the part. 17) Wiper Storage Time, tWST, is the time require for the DS1804 to write EEPROM memory for storage of a new wiper position. The maximum time required to accomplish this task is specified at 10ms. 6 of 8 DS1804 THREE-TERMINAL INTERFACE TIMING DIAGRAM Figure 2 DS1804 ORDERING INFORMATION ORDERING NUMBER DS1804-010 DS1804-050 DS1804-100 DS1804Z-010 DS1804Z-050 DS1804Z-100 DS1804U-010 DS1804U-050 DS1804U-100 DS1804X-010 DS1804X-050 DS1804X-100 PACKAGE 8L DIP (300MIL) 8L DIP (300MIL) 8L DIP (300MIL) 8L SOIC (150MIL) 8L SOIC (150MIL) 8L SOIC (150MIL) 8L SOP (118MIL) 8L SOP (118MIL) 8L SOP (118MIL) 8L FCP (118MIL) 8L FCP (118MIL) 8L FCP (118MIL) OPERATING TEMPERATURE -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C VERSION 10kW 50kW 100kW 10kW 50kW 100kW 10kW 50kW 100kW 10kW 50kW 100kW 7 of 8 DS1804 BRANDING INFORMATION Figure 3 Top Brand Bottom Brand 8-pin DIP DS1804-nnn yywwrv ###xx cccccc 8-pin SOIC DS1804m yywwrv ###xx cccccc 8-pin uSOP 1804 rvnnn yyww ###xx Code nnn m DS1804 Brand Codes Description Values Pot Size (DIP/uSOP) Pot Size (SOIC) 010 050 100 X L C 10k ohm 50k ohm 100k ohm 10k ohm 50k ohm 100k ohm yyww Date Code. It identifies the year and work week the device was assembled Die Revision Lot Code Country of Assembly eg. 0035 is the 35th work week of 2000 Generally this is a letter followed by a number (eg. B2) rv ###xx cccccc 8 of 8 |
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