The LM8327 GenI/O-Expander and Keypad Controller is a dedicated device to unburden a host
processor from scanning a matrix-addressed keypad and to provide flexible and general purpose,
host-programmable input/output functions. Three independent PWM timer outputs are provided for
dynamic LED brightness modulation.
It communicates with a host processor through an
I2C-compatible ACCESS.bus serial interface. It can communicate in
Standard (100 kHz) and Fast-Mode (400 kHz) in slave Mode only.
All available input/output pins can alternately be used as a direct key input connection,
an input or an output in a keypad matrix, or as a host-programmable general purpose input or
Any pin programmed as an input can also sense hardware interrupts. The interrupt polarity
(“high-to-low” or “low-to-high” transition) is thereby programmable.
The LM8327 follows a predefined register based set of commands. Upon startup (power on) a
configuration file must be sent from the host to setup the hardware of the device.
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