BU21029GUL-E2

Overview

The BU21029GUL-E2 is a 4-wire resistive touch screen controller by ROHM Semiconductor. It enables dual touch detection and gesture recognition, generating data for single and dual point coordinates. The device operates on a single 1.65V to 3.60V supply with a built-in 12-bit SAR ADC and clock oscillator. Key electrical parameters include a maximum standby current of 1.0 µA, typical sleep current of 100 µA, and typical operating current of 0.8 mA. It features an I2C-like interface and supports automatic or command-based control modes.

Feature Summary

• Dual touch detection capability for standard 4-wire resistive screens
• 12-bit coordinate resolution with built-in SAR ADC
• I2C-like 2-wire serial interface with selectable slave addresses (40h/41h)
• Automatic power down control to minimize current consumption

Applications

• Portable information equipment such as smartphones, tablets, and PDAs
• Audio-visual equipment including digital still cameras, video cameras, and portable TVs
• PCs and peripheral equipment like laptops, touchscreen monitors, and printers

Procurement Notes

Verify the specific suffix 'E2' against the manufacturer's latest documentation to confirm environmental compliance status. Check for obsolescence notices as previous variants in this series have been marked NRND. Ensure the host system supports the required I2C timing specifications and voltage levels for reliable communication.

Selection Notes

Select this component when dual-touch functionality is required on resistive panels, which are preferred in medical, automotive, or gloved-hand environments. Ensure the host processor can handle the calibration sequence for dual-point detection parameters. Verify that the VCSP50L2 package dimensions fit the PCB layout constraints.

Part Context

This part belongs to the BU2102x series of resistive touch screen controllers from ROHM. It shares functional similarities with models like the BU21026MUV-E2 but differs in package type and specific interface configurations. The series is designed to bridge the gap between traditional single-touch resistive screens and multi-touch capacitive solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consider evaluating other members of the BU2102x family if pin compatibility and feature sets align with the design requirements.