BU21026MUV-E2

Overview

The BU21026MUV-E2 is a low-power 4-wire resistive touch screen controller manufactured by ROHM Semiconductor. It integrates a 12-bit SAR A/D converter to measure coordinates and touch pressure, featuring a built-in digital filter for noise reduction. The device operates on a single supply voltage ranging from 1.65V to 3.60V, with a typical operating current of 120µA and a maximum standby current of 0.8µA. Communication is handled via a 2-wire serial interface (I²C-compatible) with programmable slave addresses. Key specifications include a coordinate resolution of 12 bits, an internal clock oscillation circuit, and auto power-down control. The component is housed in a VQFN020V4040 package measuring 4.00mm x 4.00mm x 1.00mm.

Feature Summary

• 12-bit SAR A/D converter for high-resolution coordinate and pressure measurement
• Low power consumption with 0.8µA max standby current and 120µA typical operating current
• Built-in Median Average Filter (MAF) for effective noise reduction
• 2-wire serial interface with programmable slave address bits (AD0, AD1)
• Auto power down control and built-in clock oscillation circuit

Applications

• Portable devices such as smartphones, tablets, and PDAs
• Equipment with built-in user interfaces using 4-wire resistive touch screens
• Digital still cameras, digital video cameras, and portable TVs
• PC peripherals including laptop PCs, touch screen monitors, and printers

Procurement Notes

Verify the specific ordering suffix E2 against the manufacturer's latest documentation to confirm compliance status and packaging details. Check the official datasheet revision history for any updates to electrical characteristics or pin configurations before finalizing procurement plans.

Selection Notes

Select this component for applications requiring low power consumption and high resolution in resistive touch interfaces. Ensure the system voltage falls within the 1.65V to 3.60V range. Consider the VQFN020V4040 package dimensions for PCB layout constraints. Verify that the host microcontroller supports the required 2-wire serial interface timing and protocol.

Part Context

The BU21026MUV is part of ROHM's Resistive Touch Screen Controller LSI series. It is designed specifically for 4-wire resistive touch panels, offering integrated signal processing capabilities. The E2 suffix typically denotes environmental compliance, but users should refer to the official datasheet for definitive confirmation regarding RoHS status and material composition.

Replacement Considerations

Consult the official ROHM datasheet for officially documented substitute part numbers. Do not assume cross-compatibility with other manufacturers' controllers without verifying pinout, voltage levels, and interface protocols.