MCP4641-104E/ST

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MCP4641-104E/ST Application Field and Working Principle

Data acquisition is the process of digitizing data for storage or further processing. Digital potentiometers enhance the accuracy of data acquisition by adjusting the gain and offset of signals maintained in a data acquisition device. MCP4641-104E/ST is one the best digital potentiometers, used for providing 128 tap two-terminal devices for resistive-based backstops and attenuators, servo loop stabilization and transducer trimming and calibration in data acquisition applications.

Application Field

MCP4641-104E/ST is designed for various applications in the data acquisition industry. It is ideally used to adjust servo loops, stabilize control systems and calibrate transducers. It is also ideal for adjusting gain and offset of analog signals. It is well suited for trimming potentiometers on printed circuit boards and calibrating DACs in various circuits. Additionally, it is designed to minimize power consumption, reduce board space and enhance system cost.

The MCP4641-104E/ST features a SPI-compatible, two-wire digital interface which allows configuration of up to 128 tap settings, along with volatile and non-volatile memory. It is available in an 8-pin, narrow-body SOIC package. This ensures a maximum total wiper resistance of 10kΩ with the TCON feature, and a non-volatile memory for keeping settings when power is removed. It also features a power-on reset circuit, enabling the MCP4641-104E/ST to reset to a known setting on power-up.

Working Principle

MCP4641-104E/ST is a dual-channel programmable digital potentiometer device. It uses a simple SPI-compatible two-wire interface to control its operation. The two channels can each be independently programmed from 0 to 10 kΩ in 8 bits of resolution, giving a total range of 0 to 100 kΩ. This can be accomplished by writing a register command to the device, which will then set the up/down-count register of each channel. The device also features non-volatile memory, a power-on reset circuit, and TCON control.

The operation of the MCP4641-104E/ST is based on a ratiometric digital potentiometer. This means that the output is proportional to the wiper setting and the total resistance of the potentiometer. The device is configured by programming the up/down-count registers. The up-count register determines the number of steps that can be achieved in a given direction, and the down-count register determines the number of steps that can be achieved in the opposite direction. When these registers are programmed, the device will move its wiper in either direction according to the programming.

The TCON control feature allows these register settings to be changed from momentary to latched operation. In latched mode, the wiper will remain in its current position until the new command has been received. This allows for more precise control of the device. Additionally, the device features non-volatile memory, which stores the settings when power is removed.

Conclusion

The MCP4641-104E/ST is a highly versatile and powerful digital potentiometer. It is designed to provide a precise and versatile tool to adjust gains and offsets in various data acquisition and digital signal control applications. Its low power consumption, small form factor, and high accuracy make it an attractive solution for data acquisition and system control circuitry.

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