概觀
The IS31IO7326 is a 64 key, key-scan controller. It
offloads the burden of keyboard scanning from the host
processor. The IS31IO7326 supports keypad matrix of
up to 8×8. Key press and release events are encoded
into a byte format and loaded into a key event register
for retrieval by the host processor.
The IS31IO7326 integrates a debounce function which
rejects false or transient key switch activities. The
interrupt output (INT_______) is used to signify if there are any
keypad activities.
To minimize power, the IS31IO7326 automatically
enters a low power standby mode when there is no
keypad, I/O, or host activity.
The IS31IO7326 is available in a Pb-free 4mm × 4mm
QFN-24 package.