BU21024FV-ME2

Overview

The BU21024FV-ME2 is a resistive touch screen controller IC designed for dual-touch detection and gesture recognition on standard 4-wire screens. It features a 10-bit ADC, an internal CPU with downloadable firmware, and supports SPI or I2C host interfaces. The device operates on a single 3V supply (2.7V to 3.6V) within an automotive-grade temperature range of -40°C to +85°C. Key capabilities include pinch, spread, and rotation gesture detection, adjustable pressure sensitivity, and intelligent calibration algorithms.

Feature Summary

• Dual-touch detection and gesture recognition (pinch, spread, rotate) on 4-wire resistive screens
• Configurable host interface: 4-wire SPI or 2-wire serial (I2C-compatible)
• Internal CPU with programmable firmware via HOST processor or external EEPROM
• AEC-Q100 qualified for automotive applications

Applications

• Automotive navigation systems and car audio displays
• Tablet PCs and notebook computers
• Industrial touch kiosks and LCD displays
• GPS receivers and digital cameras

Procurement Notes

Verify the ordering suffix 'E2' corresponds to the embossed tape and reel packaging format specified in the datasheet. Confirm that the SSOP-B28 package dimensions align with the target PCB footprint. Ensure the design accounts for the 2000-piece minimum quantity associated with this taping specification.

Selection Notes

Select this component when dual-touch functionality is required on cost-effective resistive displays. The IFSEL pin allows interface flexibility between SPI and I2C. Consider the DVDD_EXT pin if an external 1.8V digital supply is preferred over the internal regulator. Verify that the host processor can support the required register configuration and firmware download procedures.

Part Context

This part belongs to the BU21024 series of resistive touch controllers from ROHM Semiconductor. It is functionally similar to the BU21024FV-M but differs in packaging and handling specifications due to the 'E2' suffix indicating tape-and-reel delivery. It serves as an alternative to capacitive solutions where lower development costs and glove/stylus compatibility are prioritized.

Replacement Considerations

The BU21023GUL and BU21023MUV are listed as related parts in the lineup but lack dual-touch capabilities. No direct functional substitutes with identical feature sets are explicitly confirmed in the provided documentation.