BU21077MUV-E2

Overview

The BU21077MUV-E2 is a capacitance touch sensor controller IC manufactured by ROHM Semiconductor. It features an 8-channel interface for detecting capacitive switches and utilizes a serial communication protocol for data transfer. The device operates within a supply voltage range of 2.7 V to 5.5 V and supports an operating temperature range from -20°C to +85°C. It is housed in a compact VQFN-20 package with dimensions of 4 mm x 4 mm x 1 mm. The component includes power reset and oscillation stop detection (OSLT) functions to enhance system reliability.

Feature Summary

• Integrates eight dedicated channels for capacitive switch sensing applications.
• Incorporates power reset functionality to ensure stable system initialization.
• Features oscillation stop detection (OSLT) for monitoring clock signal integrity.

Applications

• Capacitive touch switch controllers for consumer electronics
• Interface modules requiring low-power capacitive sensing
• Embedded systems utilizing serial communication for sensor data

Procurement Notes

Verify the Not Recommended for New Design (NRND) status before integration, as discontinuation may affect long-term supply. Confirm RoHS compliance details through official documentation. Ensure ordering quantities align with reel packaging requirements specified by the manufacturer. Validate that the VQFN-20 footprint matches the target PCB layout constraints.

Selection Notes

Select this component when an 8-channel capacitive sensing solution is required with serial interface compatibility. Consider the 2.7 V to 5.5 V operating voltage range for power supply design. Evaluate the VQFN-20 package size against available board space. Verify thermal performance within the -20°C to +85°C operational window for the intended environment.

Part Context

This part belongs to the BU2107 series of capacitance touch sensor ICs from ROHM Semiconductor. These controllers are designed to reduce host CPU load by integrating sensor data processing. The BU21077MUV-E2 specifically offers an 8-channel configuration, distinguishing it from other variants in the family with different channel counts or package types.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Due to the NRND status, alternative components should be evaluated based on channel count, interface type, and package compatibility.