STMPE2401TBR

Overview

The STMPE2401TBR is a specialized I/O expander from STMicroelectronics, designed for low-voltage applications. It features 24 bidirectional I/O lines and communicates via an I2C interface with a clock frequency of 400 kHz. The device operates within a supply voltage range of 1.65V to 1.95V and supports surface mount installation in a 36-TFBGA package measuring 3.5x3.5 mm. It functions reliably across an extended temperature range from -40°C to +85°C. Key integrated features include keypad controller capabilities, power-on reset (POR), and pulse-width modulation (PWM) outputs. The component utilizes push-pull output drivers capable of sourcing or sinking 4mA per line.

Feature Summary

• Integrated keypad controller functionality for direct matrix scanning
• Supports PWM generation for LED brightness control or motor driving
• Includes internal power-on reset circuitry for reliable initialization
• Provides 24 general-purpose I/O pins with configurable pull-up/down resistors

Applications

• Mobile phone keypad interfaces
• Portable media player control panels
• Smartphone touch screen controller auxiliary I/O
• Handheld gaming devices input expansion

Procurement Notes

This component is officially listed as obsolete by the manufacturer. Availability is limited to existing stock from distributors. Verify end-of-life status and last-time-buy dates before finalizing designs. Sourcing may involve surplus markets with varying warranty conditions. Ensure compatibility with current supply chain constraints and long-term production requirements.

Selection Notes

Select this part for low-power embedded systems requiring extensive I/O expansion over I2C. It is suitable for battery-operated devices due to its 1.8V operation. Consider alternatives if higher voltage tolerance or faster interface speeds are needed. Evaluate package size constraints against the 36-TFBGA footprint. Confirm thermal performance meets application requirements within the specified operating temperature range.

Part Context

Part of the STMPE series of multifunctional I/O expanders. Designed to reduce system complexity by integrating multiple peripheral functions into a single chip. Commonly used in consumer electronics where space and power efficiency are critical. Replaces discrete logic and driver circuits in input/output management tasks.

Replacement Considerations

Check for STMPE2401 variants with different packaging suffixes. Review STMicroelectronics documentation for pin-compatible upgrades. Consider newer generations from the same family if available. Verify electrical characteristics match original design requirements when substituting.