MCP4021-502E/MS

Overview

The MCP4021-502E/MS is a single-channel, nonvolatile digital potentiometer featuring 64 taps and a nominal resistance of 5 kΩ. It utilizes a simple Up/Down (U/D) serial interface for wiper control and incorporates WiperLock™ technology to store settings in EEPROM without external write-protect pins. The device operates within a supply voltage range of 2.7V to 5.5V and supports high-voltage tolerant digital inputs up to 12.5V. Key electrical characteristics include a typical wiper resistance of 70 Ω, a temperature coefficient of 150 ppm/°C over the extended range, and a maximum static current of 1 µA.

Feature Summary

• Nonvolatile memory with WiperLock™ technology retains wiper settings after power loss.
• Simple Up/Down (U/D) serial interface requires only two control pins.
• High-voltage tolerant digital inputs support signals up to 12.5V.
• Low power consumption with 1 µA maximum static current.

Applications

• System calibration and trimming
• Offset adjustment circuits
• Signal conditioning and gain control
• Set-point configuration

Procurement Notes

Verify the package marking code matches the MSOP-8 specification. Confirm the 'E' suffix indicates the extended temperature range (-40°C to +125°C). Ensure the ordering suffix corresponds to the tube packaging format if required by the assembly line.

Selection Notes

Select this component when a nonvolatile solution with minimal interface complexity is required. The U/D protocol simplifies firmware compared to SPI or I2C interfaces. Verify that the 64-tap resolution meets the application's precision requirements and that the 5 kΩ resistance value aligns with the circuit design constraints.

Part Context

This part belongs to the MCP4021/2/3/4 family of low-cost nonvolatile digital potentiometers. The MCP4021 variant is specifically configured as a potentiometer, whereas other members like the MCP4022 are rheostats. All devices in this series share the same core architecture and WiperLock™ features.

Replacement Considerations

Direct pin-compatible replacements within the same family include the MCP4021-103E/MS (10 kΩ) and MCP4021-503E/MS (50 kΩ). Other variants such as the MCP4022 differ in internal configuration (rheostat vs. potentiometer) and require schematic verification before substitution.

FAQ

How does the WiperLock™ technology function?

WiperLock™ automatically saves the current wiper setting to the internal EEPROM when the CS pin is held high for a specific duration, securing the setting without requiring an additional write-protect pin.

What is the maximum voltage allowed on the CS and U/D pins?

The digital input pins (CS and U/D) are high-voltage tolerant and can withstand voltages up to 12.5V relative to VSS, independent of the VDD supply voltage.

Can the MCP4021 be used as a rheostat?

Yes, although the MCP4021 is internally configured as a potentiometer, it can be used as a rheostat by floating either Terminal A or Terminal B externally.