EVAL-AD5254EBZ: Quad 256-Position I^2C Nonvolatile Memory, Digital Potentiometer
The AD5253/AD5254 are quad channel, I^2C, nonvolatile memory, digitally controlled potentiometers with 64/256 positions, respectively. These devices perform the same electronic adjustment functions as mechanical potentiometers, trimmers, and variable resistors.
The AD5253/AD5254’s versatile programmability allows multiple modes of operation, including read/write accesses 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 I^2C 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 modes. The increment and decrement functions allow stepwise linear adjustments, while ±6 dB step changes are equivalent to doubling or halving the RDAC wiper setting. These functions are useful for steep-slope nonlinear adjustment applications 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 kOhm, 10 kOhm, 50 kOhm, and 100 kOhm options. All parts are guaranteed to operate over the –40°C to +85°C extended industrial temperature range.
1. The terms nonvolatile memory and EEMEM are used interchangeably.
2. The terms digital potentiometer and RDAC are used interchangeably.
EVAL-AD5254EBZ 特点
- AD5253: Quad 64-position resolution
AD5254: Quad 256-position resolution - 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
- Nonvolatile memory1 stores wiper settings w/ write protection
- Power-on refreshed to EEMEM settings in 300 us typ
- EEMEM rewrite time = 540 us typ
- Resistance tolerance stored in nonvolatile memory
- 12 extra bytes in EEMEM for user-defined information
- I^2C(R) compatible serial interface
- Direct read/write accesses of RDAC and EEMEM registers
- Predefined linear increment/decrement commands
- Predefined ±6 dB step change commands
- Synchronous or asynchronous quad channel update
EVAL-AD5254EBZ 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD5254BRU1 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU1-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU10 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU10-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU100 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU100-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU50 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRU50-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ1 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ1-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ10 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ10-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ100 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ100-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ50 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| AD5254BRUZ50-RL7 | 量产 | 20 ld TSSOP | 20 | 汽车级 |
| EVAL-AD5254EBZ | 量产 | 评估板 | - | 待定 |