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MCP4431-103E/ST

MCHPMCP4431-103E/ST

Microchip Technology
Digital Potentiometer 10k Ohm 4 Circuit 129 Taps I2C Interface 20-TSSOP
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Overview

The MCP4431-103E/ST is a quad-channel, 7-bit digital potentiometer with a 10k Ohm resistance and an I2C interface. It features 129 wiper steps per resistor and volatile memory, operating across a wide supply voltage range from 1.8V to 5.5V. Each of the four channels can be independently configured as a potentiometer or a rheostat.

Why Choose This Part

This device offers a high density of four independent resistors in a compact 20-TSSOP package, reducing board space compared to discrete solutions. It supports high-speed I2C communication up to 3.4MHz and features a Terminal Control (TCON) register that allows for individual terminal disconnection to minimize power consumption.

Applications

Multi-Channel Gain Control
Adjusting the gain of multiple operational amplifier stages simultaneously in analog signal conditioning circuits.
LCD Contrast Adjustment
Providing precise, software-controlled voltage levels for setting the contrast on character and graphic LCD modules.
Sensor Calibration
Replacing mechanical trimmers in industrial sensors to automate factory calibration and field offset nulling.
Variable Audio Attenuation
Controlling volume levels across multiple audio channels in low-power consumer electronics.

Key Specifications

Taper Linear
Features Selectable Address
Interface I2C
Tolerance +/-20%
Memory Type Volatile
Configuration Potentiometer
Mounting Type Surface Mount
Number of Taps 129
Package / Case 20-TSSOP (0.173", 4.40mm Width)
Voltage - Supply 1.8V ~ 5.5V
Resistance (Ohms) 10k
Number of Circuits 4
Operating Temperature -40degC ~ 125degC
Supplier Device Package 20-TSSOP
Temperature Coefficient (Typ) 150ppm/degC
Resistance - Wiper (Ohms) (Typ) 75

Getting Started

To interface with this part, connect the SDA and SCL pins to your microcontroller's I2C bus and ensure proper pull-up resistors are in place. Use the Terminal Control register to enable or disable specific resistor terminals during startup. Microchip provides the MCP44xx evaluation board for rapid prototyping and firmware development.

Also Consider

AD5254BRUZ10 Analog Devices - Offers 256 taps for higher resolution and integrated non-volatile EEPROM for storing wiper positions across power cycles.
MCP4451-103E/ST MCHPMicrochip Technology - Provides 257 taps (8-bit resolution) in the same package and pinout for applications requiring finer adjustment.