AD5254BRUZ50-RL7

四64 / 256位I2C非易失性存储器数字电位器 Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers

Product Details

The AD5253/AD5254 are quad-channel, I2C®, nonvolatile mem-ory, digitally controlled potentiometers with 64/256 positions, respectively. These devices perform the same electronic adjust-ment functions as mechanical potentiometers, trimmers, and variable resistors.

The parts’ versatile programmability allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment/decrement of resistance, resistance changes in ±6 dB scales, wiper setting readback, and extra EEMEM for storing user-defined information, such as memory data for other components, look-up table, or system identification information.

The AD5253/AD5254 allow the host I2C controllers to write any of the 64-/256-step wiper settings in the RDAC registers and store them in the EEMEM. Once the settings are stored, they are restored automatically to the RDAC registers at system power-on; the settings can also be restored dynamically.

The AD5253/AD5254 provide additional increment, decrement, +6 dB step change, and –6 dB step change in synchronous or asynchronous channel update mode. The increment and decrement functions allow stepwise linear adjustments, with a ± 6 dB step change equivalent to doubling or halving the RDAC wiper setting. These functions are useful for steep-slope, nonlinear adjustments, such as white LED brightness and audio volume control.

The AD5253/AD5254 have a patented resistance-tolerance storing function that allows the user to access the EEMEM and obtain the absolute end-to-end resistance values of the RDACs for precision applications.

The AD5253/AD5254 are available in TSSOP-20 packages in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are guaranteed to operate over the –40°C to +85°C extended industrial temperature range.

1The terms nonvolatile memory and EEMEM are used interchangeably.

2The terms digital potentiometer and RDAC are used interchangeably.

### Features and Benefits

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Quad 256-position resolution

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1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

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Nonvolatile memory1 stores wiper settings w/write protection

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Power-on refreshed to EEMEM settings in 300 μs typ

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EEMEM rewrite time = 540 μs typ

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Resistance tolerance stored in nonvolatile memory

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12 extra bytes in EEMEM for user-defined information

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I2C-compatible serial interface

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Direct read/write access of RDAC2 and EEMEM registers

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Predefined linear increment/decrement commands

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Predefined ±6 dB step change commands

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See data sheet for additional features