DS4301

DS4301 DALLAS | Alldatasheet

Document overview

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Technical content

Features

♦ Single, 32-Position, 200kΩ Linear Nonvolatile (NV) Potentiometer Ideal for Battery-Powered

Applications

♦ Three-Terminal Increment/Decrement Interface to Adjust Wiper Position ♦ Wide Voltage Supply Range (2.4V to 5.5V) ♦ Command-Initiated NV Wiper Storage ♦ Operates Over the Industrial Temperature Range (-40°C to +85°C) ♦ Available in 8-Pin µSOP DS4301 Nonvolatile, 32-Position Digital Potentiometer VCC CS L WGND H U/D INC µSOP TOP VIEW DS4301 Pin Configuration

Ordering Information

W H L WHITE LED CURRENT REGULATOR RFB WHITE LEDs 10µH MBR0540 1µF 1µF 10µF GND CS INC U/D 0.1µF CONTROL INTERFACE DS4301 Typical Operating Circuit Rev 0; 8/03 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE DS4301U-200 -40°C to +85°C 8 µSOP (118 mil)

Nonvolatile, 32-Position Digital Potentiometer ABSOLUTE MAXIMUM RATINGS RECOMMENDED DC OPERATION CONDITIONS (VCC = VCC MIN to VCC MAX; TA = -40°C to +85°C, unless otherwise specified.) Stresses beyond 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 beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Voltage Range on CS, INC, U/D, L, W, H Pins J-STD-020A Specification *Not to exceed 6.0V PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V CC (Note 1) +2.4 +5.5 V Input Logic 1 (CS, INC, U/D)V IH 0.7 x VCC VCC + 0.3 V Input Logic 0 (CS, INC, U/D)V IL -0.3 +0.3 x V CC V Resistor Inputs L, H, W -0.3 V CC + 0.3 V Wiper Current I W -1 +1 mA DC ELECTRICAL CHARACTERISTICS (VCC = VCC MIN to VCC MAX; TA = -40°C to +85°C, unless otherwise specified.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage I L -1 +1 µA 3V 30 60Standby Current (Note 2) I STBY 5V 15 60 µA Digital Input Capacitance C I/O 10 pF ANALOG RESISTOR CHARACTERISTICS (VCC = VCC MIN to VCC MAX; TA = -40°C to +85°C, unless otherwise specified.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS End-to-End Resistor Tolerance T A = +25°C -20 +20 % Wiper Resistance R W 500 2000 Ω Absolute Linearity (Note 3) -0.5 +0.5 LSB Relative Linearity (Note 4) -0.25 +0.25 LSB End-to-End Temp Coefficient -250 +250 ppm/°C Ratiometric Temp Coefficient 7 ppm/°C

Nonvolatile, 32-Position Digital Potentiometer Note 1: All voltages are referenced to ground. Note 2: STBY specified for VCC equal to 3.0V and 5.0V while control port logic pins are driven to VCC or GND. Note 3: Absolute linearity is used to determine wiper voltage versus expected voltage as determined by wiper position. Note 4: Relative linearity is used to determine the change of wiper voltage between two adjacent wiper positions. Note 5: The INC low to CS inactive time is the transition time that allows the three control pins to become inactive without writing the wiper position to the EEPROM. Note 6: Wiper storage time is the time required for the wiper position to be written to the EEPROM. During this time, the three-ter- minal interface is inactive. Note 7: Wiper load time is specified as the time required to load the wiper position stored in EEPROM once VCC has reached a stable operating voltage greater than or equal to VCC MIN. Note 8: Power-up time is specified as the time required before the three control pins become active once a stable power supply level of at least VCC MIN has been reached. Note 9: The maximum number of EEPROM write cycles is guaranteed by design and is not tested in production. AC ELECTRICAL CHARACTERISTICCS (VCC = VCC MIN to VCC MAX; TA = -40°C to +85°C. See Figure 2 for timing diagram.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CS to INC Setup t CI 50 ns U/D to INC Setup t DI 100 ns INC Low Period t IL 50 ns INC High Period t IH 100 ns INC Inactive to CS Inactive t IC 500 ns CS Deselect Time t CPH 100 ns Wiper Change to INC Low t IW 200 ns INC Rise and Fall Times t R, tF 5µ s INC Low to CS Inactive t IK (Note 5) 50 ns Wiper Storage Time t WST (Note 6) 10 ms CS Low Pulse t CLP 100 ns Wiper Load Time t WLT (Note 7) 500 µs Power-Up Time t PU (Note 8) 2 ms NONVOLATILE MEMORY CHARACTERISTICS (VCC = VCC MIN to VCC MAX) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS EEPROM Write Cycles +70°C (Note 9) 50,000

Nonvolatile, 32-Position Digital Potentiometer Typical Operating Characteristics (VCC = 5.0V; TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. VOLTAGE DS4301 toc01 VOLTAGE (V) SUPPLY CURRENT (µA) 54321 CS = INC = U/D = VCC POWER-UP POWER-DOWN SUPPLY CURRENT vs. TEMPERATURE DS4301 toc02 TEMPERATURE (°C) SUPPLY CURRENT (µA) 603510-15 -40 85 VCC = 3V VCC = 5V CS = INC = U/D = VCC W-L RESISTANCE vs. POTENTIOMETER SETTING DS4301 toc03 POTENTIOMETER SETTING (DEC) W-L RESISTANCE (kΩ) 302515 20105 100 125 150 175 200 AT VCC = 5V AND 3V W-L RESISTANCE vs. SUPPLY VOLTAGE (POWER-UP) DS4301 toc04 SUPPLY VOLTAGE (V) W-L RESISTANCE (kΩ) 54321 100 150 200 250 >1MΩ EEPROM RECALL WIPER = POS 15 W-L RESISTANCE vs. SUPPLY VOLTAGE (POWER-DOWN) DS4301 toc05 SUPPLY VOLTAGE (V) W-L RESISTANCE (kΩ) 54321 100 150 200 250 >1MΩ WIPER = POS 15 WIPER RESISTANCE vs. WIPER VOLTAGE DS4301 toc06 WIPER VOLTAGE (V) WIPER RESISTANCE (Ω) 431 2 100 150 200 300 250 350 400 VCC = 3V VCC = 5V ABSOLUTE LINEARITY vs. WIPER POSITION DS4301 toc07 WIPER POSITION (DEC) ABSOLUTE LINEARITY (LSB) 302010 -0.20 -0.15 -0.10 -0.05 0.05 0.10 0.15 0.20 0.25 -0.25 RELATIVE LINEARITY vs. WIPER POSITION DS4301 toc08 WIPER POSITION (DEC) ABSOLUTE LINEARITY (LSB) 302010 -0.20 -0.15 -0.10 -0.05 0.05 0.10 0.15 0.20 0.25 -0.25 VOLTAGE DIVIDER PERCENT CHANGE FROM +25°C vs. TEMPERATURE DS4301 toc09 TEMPERATURE (°C) % CHANGE (FROM +25°C) 603510-15 -0.04 -0.03 -0.02 -0.01 0.01 0.02 0.03 0.04 0.05 -0.05 -40 85 WIPER = POS 15 tc = 0.64ppm/°C WIPER = POS 7 tc = 2.72ppm/°C WIPER = POS 7 tc = 2.72ppm/°C WIPER = POS 15 tc = 1.37ppm/°C WIPER = POS 23 tc = 0ppm/°C

Nonvolatile, 32-Position Digital Potentiometer Typical Operating Characteristics (continued) (VCC = 5.0V; TA = +25°C, unless otherwise noted.) END-TO-END RESISTANCE PERCENT CHANGE FROM +25°C vs. TEMPERATURE DS4301 toc10 TEMPERATURE (°C) % CHANGE (FROM +25°C) 6040200-20 -40 80 -37.18ppm/°C = tc -148.38ppm/°C = tc TEMPERATURE COEFFICIENT vs. POTENTIOMETER SETTING DS4301 toc11 POTENTIOMETER SETTING (DEC) TEMPERATURE COEFFICIENT (ppm/°C) 302515 20105 -10 25°C TO 85°C +25°C TO -40°C Pin Description PIN NAME FUNCTION 1 INC Increment/Decrement Wiper Control. When INC transitions from high-to-low, the wiper moves in the direction established by the state of the U/D pin. 2U / D Up/Down Control. Sets the directions of wiper movement. When set to a high state, a high-to-low transition on the INC pin increments the wiper. When set to a low state, a high-to-low transition on the INC pin decrements the wiper.

3 H High-End Terminal of the Potentiometer

4 GND Ground Terminal

5 W Wiper Terminal of the Potentiometer

6 L Low-End Terminal of the Potentiometer

7 CS Chip Select. When set to a low state, the wiper position can be adjusted using U/D and INC. When in a high-state, activity on INC and U/D does not affect or change the wiper position. 8V CC Power Supply Terminal

Nonvolatile, 32-Position Digital Potentiometer Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. cycled to the device, the wiper setting that was just stored is the setting loaded on power-up. Wiper storage does not have to occur immediately after a change in wiper position. At anytime the current wiper position can be stored to the EEPROM by simply issu- ing a low pulse to the CS pin for t CLP while the INC pin remains in a high state. The wiper does not move dur- ing this action and the current wiper setting is stored in EEPROM after t WST. For applications that require a specific wiper setting to be loaded on power-up and never changed, write the desired wiper setting to the EEPROM, then tie CS to V CC. Every time power is cycled to the DS4301, the desired wiper setting is loaded from EEPROM, and since CS is tied to V CC, no changes can be made to the wiper setting. EEPROM Characteristics There is a limit to the number of times the EEPROM can be written to before a wear-out occurs (see the Nonvolatile Memory Characteristics table). After EEP- ROM wear-out occurs, the wiper can still be adjusted, however accurately storing the wiper position is no longer possible. When power is removed from the part, the current wiper position is lost. Upon power-up, the wiper setting stored in EEPROM is loaded within t WLT of VCC reaching a stable voltage level greater than or equal to V CC MIN . If EEPROM wear-out has occurred, the wiper setting that is loaded is unknown.

Application Information

To achieve the best results when using the DS4301, decouple the power supply with a 0.01µF or 0.1µF capacitor. Use a high-quality ceramic surface-mount capacitor when possible. Surface-mount components minimize lead inductance, improving performace. Ceramic capacitors tend to have adequate high- frequency response for decoupling applications. Chip Information TRANSISTOR COUNT: 3512 SUBSTRATE INFO: P-substrate

Package Information

For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.