DSA00358003.pdf by STMicroelectronics

Partial File Text AN2421 Application note Using the STMPE801 as a keypad controller Introduction STMPE801 is an 8-bit general purpose port expander device in the STMicroelectronics Port Expander Logic family. Its
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4 by 3 keypad Keypad Controller keypad scanning keypad with interrupts scanning logic STMPE801 XY 801