MCP42100-I/ST

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Data acquisition is the process of converting a physical quantity into an electrical signal. Digital potentiometers are part of the same field, offering a cost-effective, accurate and efficient way to acquire data in a variety of ways to process that data or help control systems or circuits. The Microchip MCP42100-I/ST is an example of these digital potentiometers that can help increase accuracy and efficiency of data acquisition.

The MCP42100-I/ST is a 2-channel digital potentiometer that allows easy implementation of linear or non-linear transfer functions, and the digital control of analog signals. It is a low-cost, low-power solution for systems requiring a digital potentiometer that includes a high-resolution, 256-tap/step solution. It has a guaranteed resistance tolerance rating of ±25ppm for each channel, ensuring reliable operation of data acquisition and control systems. This digital potentiometer is direction-independent and can be adjusted from either rail of the power supply, making it useful for a wide variety of applications. It also features an auto-incrementing mode for creating adjustable voltage dividers and adjustable resistor ladders. For example, it is widely used in LED dimming applications requiring high precision.

In addition to that, the MCP42100-I/ST features a current-limiting function to protect against short circuits and other catastrophes. The device operates on a single supply 2.7 V to 5.5 V and both channels operate over a temperature range of -40°C to +125°C.

The working principle of the MCP42100-I/ST digital potentiometer is relatively simple – voltages are set between the two terminals of the device, which then sends the voltage difference to the device’s output. The circuit is fully digital, and depending on the number of steps in the potentiometer, the switch can achieve different levels of granularity when adjusting the voltages. The device allows for either direct control of the tap setting, or it can be configured to update the tap setting by each step increment, which is typically done when constructing adjustable voltage dividers or resistor ladders.

Overall, the MCP42100-I/ST digital potentiometer from Microchip provides an easy way to increase precision and accuracy in data acquisition and control systems. It not only provides a low-cost solution but also offers a wide range of features such as a guaranteed resistance rating, an auto-incrementing mode, a current-limiting function and a temperature range of -40°C to +125°C.

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