LM8333 PDF Datasheet
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Description
This is Keypad Controller.
LM8333 Keypad Controller with I, O Expansion and ACCESS.bus Host Interface
September 2006
LM8333 Keypad Controller with I, O Expansion and ACCESS.bus Host Interface
1.0 General Description
The LM8333 is a general-purpose controller for matrixaddressed keypads which provides an ACCESS.bus (I2Ccompatible) interface to a host microcontroller. It offloads the burden of keyboard scanning from the host, while providing extremely low power consumption in both operational and standby modes. It supports keypad matrices up to 8 x 8 in size (plus another 8 special-function keys), for portable applications such as cellphones, PDAs, games, and other handheld applications. Key press and release events are encoded into a byte format and loaded into a FIFO buffer for retrieval by the host processor. An interrupt output (IRQ) is used to signal events such as keypad activity, a state change on either of two interrupt-capable general-purpose I, O pins, or an error condition. Interrupt.