BU21009MUV-E2

Overview

The BU21009MUV-E2 is a capacitive sensor controller IC featuring 16 channels for switch and slider functions. It integrates a 10-bit AD converter, clock generation, and reset circuits within a VQFN032V5050 package. The device operates with an analog supply voltage (AVDD) ranging from 2.5V to 3.3V and a digital supply voltage (DVDD) from 1.7V to 3.3V. It supports a 2-wire serial interface with standard mode up to 100kHz and fast mode up to 400kHz transfer rates. The internal oscillator frequency ranges from 0.4MHz to 2.0MHz, and the A/D conversion time is approximately 77μsec at a 1MHz clock.

Feature Summary

• Supports both switch and slider functions across 16 calibrated channels.
• Includes integrated LED driver capabilities without PWM function.
• Features automatic power management that transitions to low-power idle mode when sensors are inactive.
• Provides auto-calibration to compensate for temperature drift, process variations, and aging effects.

Applications

• Mobile phones
• Portable electronic equipment
• Audiovisual apparatuses

Procurement Notes

Verify component authenticity through authorized ROHM distributors or verified local sources. Confirm the specific E2 suffix indicates embossed tape and reel packaging containing 2500 pieces per reel. Ensure the ordering information matches the official datasheet specifications before finalizing procurement transactions.

Selection Notes

Select this component for applications requiring multiple capacitive inputs in a compact form factor. Verify that the system design accommodates the specified AVDD and DVDD voltage ranges. Ensure the host microcontroller supports the required 2-wire serial communication protocol for data retrieval and configuration.

Part Context

This part belongs to the BU21009MUV series of capacitive sensor control ICs manufactured by ROHM Semiconductor. The product utilizes a VQFN032V5050 package designed for space-constrained portable electronics. It serves as a dedicated controller for managing capacitive touch interfaces in consumer devices.

Replacement Considerations

Consult official ROHM documentation for confirmed substitute part numbers. Do not assume functional equivalence with other capacitive sensor controllers without verifying pinout compatibility and electrical specifications against the original datasheet.

FAQ

What is the resolution of the integrated A/D converter?

The integrated A/D converter has a resolution of 10 bits.

How does the device handle power consumption during inactivity?

The device automatically transitions into a low-power idle mode when sensors are not touched, waking up upon detection of a sensor input.

Can the device be used for position tracking?

Yes, it supports slider functions and provides X and Y positional values via specific registers when configured for matrix arrangements.