DS1804 NV Trimmer Potentiometer www.dalsemi.com FEATURES PIN ASSIGNMENT Single 100-position taper potentiometer Nonvolatile “on-demand” wiper storage Operates from 3V or 5V supplies Up/down, increment-controlled interface Available in 8-pin (300-mil) DIP, 8-pin (150-mil) SOIC, 8-pin (118-mil) µSOP, and Flip Chip packages Operating Temperature: – Industrial: -40ºC to +85ºC Standard Resistance Values: – DS1804-010 10 kΩ – DS1804-050 50 kΩ – DS1804-100 100 kΩ INC 1 8 VCC U/D 2 7 CS H 3 6 L GND 4 5 W 8-Pin DIP (300-mil) 8-Pin SOIC (150-mil) 8-Pin uSOP (118-mil) 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 having 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 3-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 10 kΩ, 50 kΩ, and 100 kΩ. 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 (300-mil) DIP, 8-pin (150-mil) SOIC, 8-pin (118-mil) uSOP, and the Flip Chip Package. 1 of 7 102699 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 3-terminal control port. A block diagram of the DS1804 is shown in Figure 1. The 3-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 3-terminal interface control is shown in Figure 2. PIN DESCRIPTIONS VCC - Power Supply. The DS1804 will support supply voltages ranging from +2.7 to +5.5 volts. 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 can not 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 3-terminal control port. Voltage applied to the wiper cannot exceed the powersupply voltage, VCC, or go below ground. CS - 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. - 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 7 102699 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 3-terminal control port. On power-up, wiper position will be loaded within a maximum time period of 500 µs once the power-supply is stable. Additionally, the 3-terminal interface port will be active after 50 ms. 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 3terminal 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 3terminal 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 7 102699 DS1804 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature -1.0V to +7.0V -40°C to +85°C -55°C to +125°C 260°C for 10 seconds * 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 SYMBOL MIN Supply Voltage VCC Input Logic 1 MAX UNITS NOTES +2.7 5.5 V 1 VIH 2.0 VCC+0.5 V 1,2 Input Logic 0 VIL -0.5 +0.8 +0.6 V 1,15 Resistor Inputs L,H,W GND-0.5 VCC+0.5 V 1,3 DC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Supply Current ICC Input Leakage ILI Wiper Resistance RW Wiper Current IW TYP (-40°C to +85°C) (-40°C to +85°C; VCC=2.7V to 5.5V) MIN TYP -1 400 MAX UNITS NOTES 400 µA 4 +1 µA 1000 Ω 1 mA 40 µA µA 5 Standby Current: 3 Volts 5 Volts ISTBY 10 20 Wiper Load Time tWLT 500 µs 6 Power-Up Time tPU 50 ms 14 4 of 7 102699 DS1804 ANALOG RESISTOR CHARACTERISTICS PARAMETER SYMBOL MIN (-40°C to +85°C;VCC=2.7V to 5.5V) TYP -20 End-to-End Resistor Tolerance MAX UNITS NOTES +20 % 8 Absolute Linearity ±0.6 LSB 9 Relative Linearity ±0.25 LSB 10 MHz 11 -3 dB Cutoff Frequency fcutoff Temperature Coefficient 750 CAPACITANCE PARAMETER Input Capacitance Output Capacitance (25°C; VCC=2.7V to 5.5V) SYMBOL MIN MAX UNITS NOTES CIN 5 pF 12 COUT 7 pF 12 AC ELECTRICAL CHARACTERISTICS PARAMETER CS to INC Setup U/ D to INC Setup ppm/°C SYMBOL MIN tCI TYP (-40°C to +85°C; VCC=2.7V to 5.5V) TYP MAX UNITS NOTES 50 ns 13 tDI 100 ns 13 INC Low Period tIL 50 ns 13 INC High Period tIH 100 ns 13 INC inactive to CS Inactive tIC 500 ns 13 tCPH 100 ns 13 CS Deselect Time Wiper Change to INC Low tIW 200 ns 13 500 µs 13 ns 16 ms 13,17 INC Rise and Fall Times tR , tF INC Low to CS Inactive tIK Wiper Storage Time 50 tWST 10 5 of 7 102699 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; 10 kΩ, the DS1804050 50 kΩ; and the DS1804-100 100 kΩ. 8. Valid at 25°C 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. -3 dB cutoff frequency characteristics for the DS1804 depend on potentiometer total resistance. DS1804-010, 1 MHz, DS1804-050; 200 kHz, and DS1804-100; 100 kHz. 12. Capacitance values apply at 25°C. 13. See Figure 2. 14. Power-up time is specified as the time required before the 3-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 50 ns minimum. This is the transition condition which allows the DS1804 3-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 10 ms. 6 of 7 102699 DS1804 DS1804 ORDERING INFORMATION ORDERING NUMBER PACKAGE OPERATING TEMPERATURE VERSION DS1804-010 8L DIP (300-MIL) -40°C TO +85°C 10kΩ DS1804-050 8L DIP (300-MIL) -40°C TO +85°C 50kΩ DS1804-100 8L DIP (300-MIL) -40°C TO +85°C 100kΩ DS1804Z-010 8L SOIC (150-MIL) -40°C TO +85°C 10kΩ DS1804Z-050 8L SOIC (150-MIL) -40°C TO +85°C 50kΩ DS1804Z-100 8L SOIC (150 MIL) -40°C TO +85°C 100kΩ DS1804u-010 8L µSOP (118-MIL) -40°C TO +85°C 10kΩ DS1804u-050 8L µSOP (118-MIL) -40°C TO +85°C 50kΩ DS1804u-100 8L µSOP (118-MIL) -40°C TO +85°C 100kΩ DS1804X-010 8L FCP (118-MIL) -40°C TO +85°C 10kΩ DS1804X-050 8L FCP (118-MIL) -40°C TO +85°C 50kΩ DS1804X-100 8L FCP (118-MIL) -40°C TO +85°C 100kΩ 3-TERMINAL INTERFACE TIMING DIAGRAM Figure 2 7 of 7 102699