双数字可编程电位计（ DPP⑩ ）与256丝锥和SPI接口 Dual Digitally Programmable Potentiometers DPP™ with 256 Taps and SPI Interface
The CAT5261 is two digital POTs integrated with control logic and 8 bytes of NVRAM memory. Each digital POT consists of a series of resistive elements connected between two externally accessible end points. The tap points between each resistive element are connected to the wiper outputs with CMOS switches. A separate 8-bit control register WCR independently controls the wiper tap switches for each digital POT. Associated with each wiper control register are four 8-bit non-volatile memory data registers DR used for storing up to four wiper settings. Writing to the wiper control register or any of the non-volatile data registers is via a SPI serial bus. On power-up, the contents of the first data register DR0 for each of the potentiometers is automatically loaded into its respective wiper control register.The CAT5261 can be used as a potentiometer or as a two terminal, variable resistor. It is intended for circuit level or system level adjustments in a wide variety of applications. It is available in the -40°C to 85°C industrial operating temperature range.
Features
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- Two linear-taper digital potentiometers
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- 256 resistor taps per potentiometer
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- End to end resistance 50 kΩ or 100 kΩ
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- Potentiometer control and memory access via SPI interface
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- Low wiper resistance, typically 100 Ω
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- Nonvolatile memory storage for up to four wiper settings for each potentiometer
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- Automatic recall of saved wiper settings at power up
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- 2.5 to 6.0 volt operation
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- Standby current less than 1 µA
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- 1,000,000 nonvolatile WRITE cycles
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- 100 year nonvolatile memory data retention
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- Industrial temperature range