STMPE801QTR

Overview

The STMPE801QTR is an 8-bit I/O expander from STMicroelectronics, designed for applications requiring additional general-purpose input/output lines. It communicates via a standard I2C interface with a maximum clock frequency of 6.5 MHz. The device operates within a supply voltage range of 1.65 V to 3.6 V and supports interrupt outputs for efficient event handling. It features ESD protection rated at 4 kV and includes a power-on reset function. The component is housed in a QFN-16 package and functions across a temperature range of -40°C to +85°C.

Feature Summary

• Provides eight configurable general-purpose I/O pins accessible through the I2C bus.
• Integrates an interrupt output mechanism to signal state changes without continuous polling.
• Includes built-in power-on reset logic to ensure reliable initialization upon power-up.

Applications

• General-purpose input/output expansion in embedded systems
• Interface extension for microcontrollers with limited pin counts
• Control interfaces for peripheral devices in consumer electronics

Procurement Notes

Verify current availability status as the part may be obsolete or discontinued. Confirm that the QFN-16 package dimensions match your PCB footprint requirements. Ensure the I2C address configuration aligns with your system design. Check for any specific ordering suffixes if available. Validate that the operating voltage range meets your application's power supply specifications before procurement.

Selection Notes

Select this component when an 8-bit I/O expansion solution is required with I2C connectivity. Consider the low voltage operation suitable for modern digital logic levels. Evaluate the need for interrupt capabilities versus simple polling methods. Assess the thermal performance within the specified operating temperature range. Compare against other expanders if more than eight ports are needed.

Part Context

This device belongs to the STMPE series of touch controllers and I/O expanders by STMicroelectronics. While some sources describe it as a touch controller, its primary documented function is as an 8-bit port expander. It shares architectural similarities with other members of the family but offers specific pin counts and interface options tailored for general I/O tasks rather than dedicated touchscreen digitization.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. The product status is listed as obsolete in several distributor records. Engineers should consult official STMicroelectronics resources for potential end-of-life notifications or recommended alternatives. Design modifications may be necessary if direct replacements are unavailable.