MCP4021-202E/MS

Overview

The MCP4021-202E/MS is a nonvolatile, 6-bit digital potentiometer manufactured by Microchip Technology in an 8-pin MSOP package. It features a nominal resistance of 2.1 kΩ with 64 taps and a linear taper. The device utilizes a simple Up/Down (U/D) serial interface for wiper control and incorporates WiperLock™ technology to store settings in internal EEPROM. Operating within a voltage range of 2.7V to 5.5V, it supports high-voltage tolerant inputs up to 12.5V and functions across an extended temperature range of –40°C to +125°C.

Feature Summary

• Nonvolatile memory with WiperLock™ technology retains the last wiper setting after power loss without requiring external write-protect pins.
• High-voltage tolerant digital inputs allow CS and U/D signals to withstand up to 12.5V while VDD operates at 2.7V–5.5V.
• Low static current consumption of 1 µA maximum when the serial interface is inactive.
• Wide bandwidth operation with a typical -3 dB frequency of 4 MHz for the 2.1 kΩ device.

Applications

• System trimming and calibration where power-down retention is required.
• Offset-adjust and set-point adjustment in signal conditioning circuits.
• Gain control applications utilizing the high-speed bandwidth capabilities.

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the application circuit respects the absolute maximum ratings for input voltages on the CS and U/D pins relative to VSS. Ensure proper handling procedures are followed due to moisture sensitivity classification.

Selection Notes

Select this component when a single-channel digital potentiometer with nonvolatile storage is needed. The 2.1 kΩ resistance value suits low-power signal paths. Consider the 64-step resolution for coarse adjustments. Verify that the Up/Down interface aligns with the available microcontroller GPIO resources rather than SPI or I2C protocols.

Part Context

This part belongs to the MCP4021/2/3/4 family of low-cost nonvolatile digital potentiometers. The '202' code indicates the 2.1 kΩ resistance value, while '/MS' specifies the 8-lead Mini Small Outline Package (MSOP). Other variants in the series include different resistance values and rheostat configurations.

Replacement Considerations

Direct pin-compatible replacements within the same family include other MCP402x devices with matching resistance codes if the configuration mode differs. Cross-family substitution requires verification of interface compatibility and voltage tolerances.

FAQ

How does the WiperLock™ technology function?

WiperLock™ automatically saves the current wiper position to the internal EEPROM whenever the device is powered down or when explicitly commanded, ensuring the setting is recalled upon power-up without needing a separate write-protect pin.

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

The CS and U/D inputs are high-voltage tolerant and can withstand up to 12.5V with respect to VSS, even when the supply voltage (VDD) is as low as 2.7V.

Can the MCP4021 be configured as a rheostat?

Yes, although the MCP4021 is primarily described as a potentiometer, floating either Terminal A or Terminal B allows the device to be used in a rheostat configuration.