MCP42100T-I/SL

Digital Potentiometers Overview

The MCP42100T-I/SL is a dual-channel digital potentiometer manufactured by Microchip Technology. It features two independent 100 kΩ resistive networks, each with 256 linear tap positions controlled via an SPI serial interface. The device operates on a single supply voltage ranging from 2.7V to 5.5V and supports industrial temperature conditions from -40°C to +85°C. Key electrical characteristics include a maximum INL and DNL of ±1 LSB, a typical wiper resistance of 175 Ω at 5.5V, and a static supply current of less than 1 µA. The SOIC-14 package includes dedicated hardware shutdown and reset pins for power management.

Digital Potentiometers Feature Summary

• Dual-channel architecture with 256 linear tap positions per channel
• SPI serial interface supporting Mode 0,0 and Mode 1,1
• Hardware Shutdown (SHDN) and Reset (RS) pins for power control
• Daisy-chain capability via Serial Output (SO) pin

Digital Potentiometers Applications

• Voltage level shifting and bias adjustment in analog circuits
• Programmable gain amplifier configurations
• Digital volume control in audio signal paths
• Calibration of sensor reference voltages

Digital Potentiometers Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging when ordering. Confirm the '/I/SL' designation corresponds to the industrial temperature range (-40°C to +85°C) and SOIC-14 package. Ensure compatibility with system voltage levels within the 2.7V to 5.5V operating range.

Digital Potentiometers Selection Notes

Select this component for applications requiring precise, non-volatile-free resistance adjustment without mechanical wear. The dual-channel design allows for matched resistance tracking between channels, with matching variation specified at less than 1%. Consider the 175 Ω wiper resistance impact on signal integrity if driving low-impedance loads.

Digital Potentiometers Part Context

This part belongs to the MCP42XXX family of dual digital potentiometers. It shares the same core architecture as the MCP42010 (10 kΩ) and MCP42050 (50 kΩ), differing primarily in nominal resistance value. The device is designed to replace mechanical potentiometers in space-constrained PCB layouts.

Digital Potentiometers Replacement Considerations

Direct functional substitutes within the same package and specification include MCP42100-I/ST (TSSOP-14) or MCP42100-E/SL (Extended Temperature). Verify pinout compatibility and thermal requirements when cross-referencing with other manufacturers' digital potentiometers.

Digital Potentiometers FAQ

How does the hardware Shutdown pin function?

Pulling the SHDN pin low disconnects Terminal A from the resistor stack and connects the Wiper to Terminal B, reducing power consumption while preserving the wiper register data.

What is the behavior of the wiper position upon power-up?

Upon power-up, the wiper position automatically resets to the mid-scale value (Code 80h) for both channels.

Can multiple devices be connected together?

Yes, multiple MCP42XXX devices can be daisy-chained using the Serial Output (SO) pin to synchronize commands across several units.