This is a hardware and software guide for the STMPE801 8-bit port expander Xpander Logic™. It introduces the features and characteristics of STMPE801 and provides detailed application instructions.
AN3299 is a technical guide designed to complement the STMPE801 datasheet. It details hardware implementation strategies, including recommended external component values for reset and interrupt pins, power supply sequences, and GPIO output configurations (push-pull and open drain). The document also addresses suspend mode operation to optimize current consumption.
The second half of the note focuses on software integration. It outlines procedures for I2C initialization, address updates, and programming routines. Additionally, it provides guidance on interrupt handling and debouncing techniques for hotkeys.
| Operating Voltage Range | 1.65 V to 3.6 V |
|---|---|
| Device Type | 8-bit port expander |
It is necessary to turn on supply to VIO first and then follow with VCC if they are connected to different supply voltages.
The minimum pulse width of the external reset signal is 100 us.