MCP4131-503E/MF

Memory Type:	Volatile
Base Part Number:	MCP4131
Supplier Device Package:	8-DFN-EP (3x3)
Package / Case:	8-VDFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C
Resistance - Wiper (Ohms) (Typ):	75
Temperature Coefficient (Typ):	150 ppm/°C
Tolerance:	±20%
Features:	--
Voltage - Supply:	1.8 V ~ 5.5 V
Series:	--
Interface:	SPI
Resistance (Ohms):	50k
Number of Taps:	129
Number of Circuits:	1
Configuration:	Potentiometer
Taper:	Linear
Part Status:	Active
Packaging:	Tube

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Introduction

Various types of sensors can be used in the data acquisition processes, some of which measure physical properties and convert them into electrical signals. The signals are usually measured in units such as volts and milliamps. Digital potentiometers are a type of data acquisition sensor that utilizes the resistance of an element to measure the output or the current in a circuit. The MCP4131-503E/MF is a digital potentiometer manufactured by Microchip Technology Incorporated and is intended for use in a wide range of applications where position and/or resistance must be accurately measured and controlled.

MCP4131-503E/MF Application Field

The MCP4131-503E/MF digital potentiometer is a low-power, 3-terminal, 8-bit digital potentiometer with a total resistance of 5KΩ and a resistor element of 1.25KΩ for each tap. It has a tap selector that is programmable through a SPI(Serial Peripheral Interface) interface and is controlled by an external controller. Because of its low power requirements and versatile input/outputs, it is most suitable in applications where power sources are limited such as battery operated systems.Applications that are well suited for the MCP4131-503E/MF includes:

• Resistance control in consumer appliances, such as dimming of backlights on LCD displays.
• Replacing conventional mechanical potentiometers for volume controls in consumer audio equipment.
• Actuator control and adjustment in medical instruments and systems.
• Process control in industrial automation systems.

MCP4131-503E/MF Working Principle

The MCP4131-503E/MF digital potentiometer works by taking a digitally programmable external control signal (e.g. a pulse-width modulated signal) and outputting a corresponding analog voltage or current level. The MCP4131-503E/MF is designed as an 8-bit potentiometer that divides the total resistance of 5KΩ into 256 taps of 1.25KΩ for each tap over the entire range.The device features a three-terminal design with a select pin, a control pin, and a ground pin. A control signal from an external controller is pulled up by the select pin. This voltage is then compared to the reference voltage on the control pin. The current output is proportional to the position of the select pin, and the resistor element chosen by the external controller is determined by the select pin and the current reference voltage. This voltage range is achieved through the manipulation of the reference voltage, the select pin and the external control.

Conclusion

The MCP4131-503E/MF digital potentiometer is a versatile, low-power, 3-terminal 8-bit digital potentiometer designed for a wide range of application fields. Typically, applications that are well suited for the device include resistance control, actuator control and adjustment, audio equipment volume control and industrial automation systems process control. The device utilizes a three-terminal design to detect and output analog voltage or current levels based on the external control signal and the resistor element.

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