AD5258 Analog Devices User Guide and Specifications Manual

Nonvolatile, I2C®-Compatible 64-Position, Digital Potentiometer

AD5258 FEATURES FUNCTIONAL BLOCK DIAGRAMS Nonvolatile memory maintains wiper settings

VDD RDAC

64-position digital potentiometer

VLOGIC RDAC

EEPROM

Compact MSOP-10 (3 mm × 4.9 mm) REGISTER

I2C-compatible interface

VLOGIC pin provides increased interface flexibility SCL

SDA I2C

End-to-end resistance 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ CONTROL

SERIAL INTERFACE

Resistance tolerance stored in EEPROM (0.1% accuracy)

AD0 COMMAND

Power-on EEPROM refresh time <1 ms AD1 DECODE LOGIC

AD5258

Software write protect command ADDRESS DECODE LOGIC

POWER-

Address Decode Pin AD0 and Address Decode Pin AD1 allow

ON RESET

CONTROL LOGIC

four packages per bus 100-year typical data retention at 55°C

Figure 1. Block Diagram

Wide operating temperature −40°C to +85°C

3 V to 5 V single supply VLOGIC VDD

APPLICATIONS

EEPROM

LCD panel VCOM adjustment SCL RDAC

SDA I2C REGISTER LCD panel brightness and contrast control SERIAL AND

AD0 INTERFACE LEVEL

AD1 SHIFTER

Mechanical potentiometer replacement in new designs

COMMAND Programmable power supplies DECODE LOGIC RF amplifier biasing ADDRESS DECODE LOGIC

Automotive electronics adjustment

CONTROL LOGIC

Gain control and offset adjustment

Fiber to the home systems

Figure 2. Block Diagram Showing Level Shifters

Electronics level settings

GENERAL DESCRIPTION

The AD5258 provides a compact, nonvolatile 3 mm × 4.9 mm of 0.1%. There is also a software write protection function that packaged solution for 64-position adjustment applications. These ensures data cannot be written to the EEPROM register.

devices perform the same electronic adjustment function as

A separate VLOGIC pin delivers increased interface flexibility. For

mechanical potentiometers1 or variable resistors, but with

users who need multiple parts on one bus, Address Bit AD0 and

enhanced resolution and solid-state reliability.

Address Bit AD1 allow up to four devices on the same bus.

The wiper settings are controllable through an I2C-compatible

1 The terms digital potentiometer, VR (variable resistor), and RDAC are used

digital interface that is also used to read back the wiper register 9-

interchangeably.

and EEPROM content in addition, resistor tolerance is stored within EEPROM, providing an end-to-end tolerance accuracy

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