AD5255
Obsolete3-Channel, Dual 512- and Single 128-Position I2C Digital Potentiometer with Nonvolatile Memory and I2C Interface
Part Details
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The AD5255 provides a dual 512 position and a single 128 position digitally controlled variable resistors1 (VR) in a TSSOP package. This device performs the same electronic adjustment function as a potentiometer, trimmer, or VR. Each VR offers a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. The fixed A-to-B terminal resistance of 25 kΩ or 250 kΩ has a 1% channel-to-channel matching tolerance and a nominal temperature coefficient of 35 ppm/°C.
Wiper position programming, EEPROM2 reading, and EEPROM writing is conducted via the standard 2-wire I2C interface. Pre-vious/default wiper position settings can be stored in memory and refreshed upon system power-up.
Additional features of the AD5255 include preprogrammed linear and logarithmic increment/decrement wiper changing. The actual resistor tolerances are stored in EEPROM, so the actual end-to-end resistance is known, which is valuable for calibration in precision applications.
The AD5255 is available in a 24-lead TSSOP. All parts are guaranteed to operate over the extended industrial temperature range of −40°C to +85°C.
1 The terms programmable resistor, variable resistor, RDAC, and digital potentiometer are used interchangeably.
2 The terms nonvolatile memory, EEMEM, and EEPROM are used interchangeably.
- Mechanical potentiometer replacement
- RGB LED backlight controls
- White LED brightness adjustment
- Programmable gain and offset controls
- Programmable filters
Documentation
Data Sheet 1
Application Note 1
Frequently Asked Question 1
Product Selection Guide 1
Device Drivers 1
Webcast 2
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
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