BU21182FS-E2

Overview

The BU21182FS-E2 is a capacitive switch controller IC designed for detecting switch operations based on capacitance changes. It supports Switch ON, OFF, and Long Press detection across 20 sensor ports. The device features a 2-wire serial bus interface compatible with the I2C protocol and includes noise and drift calibration functions. Operating from a single power supply of 3.0V to 5.5V, it consumes a typical active current of 3.5mA. The component operates within a temperature range of -25°C to +85°C and is housed in an SSOP-A32 package measuring 13.60mm x 7.80mm x 2.01mm.

Feature Summary

• Detects switch states including ON, OFF, and Long Press via capacitance change monitoring.
• Integrates automatic noise and drift calibration to maintain sensing stability.
• Communicates with host systems through a standard 2-wire serial bus interface.
• Provides interrupt signals to notify the host of detected switch events.

Applications

• Office automation appliances such as printers.
• Audio-visual equipment including TVs and HDD recorders.
• Home appliances like air conditioners, refrigerators, and rice cookers.
• Electrical equipment requiring multiple switch inputs.

Procurement Notes

Verify the specific ordering suffix E2 against the manufacturer's latest documentation to confirm compliance with RoHS directives and material composition requirements. Confirm that the SSOP-A32 package dimensions align with the target PCB footprint design. Ensure the host system supports the required 2-wire serial bus protocol timing specifications for reliable communication.

Selection Notes

Select this component when a solution for multi-button capacitive sensing is required without external analog components. The integrated LDOs simplify power distribution by providing dedicated voltages for analog and digital blocks. Consider the 20 available sensor ports for designs needing extensive user interface controls. Verify that the operating voltage range matches the system power supply constraints.

Part Context

This part belongs to ROHM Semiconductor's series of capacitive switch controllers. These devices are engineered to replace mechanical switches, offering improved durability and design flexibility. The BU21182FS specifically targets applications requiring robust touch detection with minimal external circuitry, utilizing internal oscillators and converters for signal processing.

Replacement Considerations

Consult official substitution lists for direct replacements. Verify pin compatibility and register map alignment if considering alternative models within the same family. Ensure thermal characteristics and package dimensions remain consistent during any cross-reference evaluation.