New MAX7359 key-switch controller with the I2C interface and FIFO register, implements up to 64 keys. (New programming guide).
Maxim published new application note “Using the MAX7359 for Multifunctional and Gaming Keys on PDAs/Smartphones: A Programming Guide.”
The MAX7359 is a special-purpose key-switch controller suitable for cell phones, printers, and other portable applications. It implements up to 64 keys and separate keypress and release codes are assigned for every key. Multiple keys can be pressed simultaneously and/or held and released in different orders. Up to 16 keypress and release entries can be held in a FIFO register and it is read through an I²C interface at one keypress or release entry per byte.
Drawing 1. (large view)
The AN4054 application note is available for download from the Maxim website.