MCP4232-502E/UN

Digital Potentiometers Overview

The MCP4232-502E/UN is a dual-channel digital rheostat manufactured by Microchip Technology. It features two independent resistor networks, each with 129 discrete steps (7-bit resolution) and a nominal resistance of 5 kΩ between terminals A and B. The device operates on a single supply voltage ranging from 1.8V to 5.5V and utilizes a standard SPI serial interface for control. Wiper settings are stored in volatile RAM, resetting to mid-scale upon power-up or brown-out events. Key electrical characteristics include a typical wiper resistance of 75 Ω and an extended operating temperature range from -40°C to +125°C.

Digital Potentiometers Feature Summary

• Dual Resistor Network: Contains two independent 5 kΩ rheostats with 129-step resolution.
• SPI Interface: Supports high-speed read/write operations at up to 10 MHz (modes 0,0 and 1,1).
• Wide Voltage Operation: Functional operation supported from 1.8V to 5.5V; specified characteristics from 2.7V to 5.5V.
• High-Voltage Inputs: Digital inputs tolerate voltages up to 12.5V, enabling compatibility with higher logic levels.

Digital Potentiometers Applications

• Variable gain control in audio signal processing circuits.
• Adjustable reference voltage generation in sensor interfaces.
• Programmable bias current setting in analog front-end modules.
• Load balancing in split-rail power supply configurations.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'UN' corresponds to the MSOP-10 package when sourcing components. Confirm that the specific revision matches the required thermal and electrical specifications. Ensure the volatile memory requirement aligns with system power management strategies, as settings are lost upon power loss.

Digital Potentiometers Selection Notes

Select this component over potentiometer variants if a variable resistor configuration is required rather than a voltage divider. Consider the MCP4252 if 8-bit (257-step) resolution is necessary. Verify that the 5 kΩ resistance value suits the target circuit's impedance requirements, as other values like 10 kΩ or 50 kΩ are available in the same family.

Digital Potentiometers Part Context

This part belongs to the MCP41XX/42XX family of SPI-controlled digital potentiometers. It shares architectural similarities with the MCP4132 (single channel) and MCP4252 (dual channel, 8-bit). The '502' suffix specifically denotes the 5 kΩ resistance value within the product line.

Digital Potentiometers Replacement Considerations

Direct functional substitutes include the MCP4252-502E/UN for increased resolution or the MCP4231-502E/UN if potentiometer configuration is needed instead of rheostat. Ensure pinout compatibility and voltage tolerance requirements are met when cross-referencing datasheets.