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LM8322 - Mobile I/O Companion Supporting Key-Scan

General Description

The LM8322 Mobile I/O Companion is a dedicated device to unburden a host processor from scanning a matrix-addressed keypad.

In addition, the LM8322 provides general-purpose I/O expansion, and PWM outputs useful for dynamic LED brightness modulation.

Key Features

  • Key Features.
  • Supports keypad matrices of up to 8 × 12 keys plus 8 special-function (SF) keys for a total of 104 keys. SF keys pull keypad scan inputs directly to ground, rather than connecting to a keypad scan output.
  • Supports I2C-compatible ACCESS. bus interface in slave mode up to 400 kHz (Fast-mode). 3.0.

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Datasheet Details

Part number LM8322
Manufacturer National Semiconductor Corporation
File Size 893.97 KB
Description Mobile I/O Companion Supporting Key-Scan
Datasheet download datasheet LM8322 Datasheet

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Full PDF Text Transcription (Reference)

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LM8322 Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface May 2007 LM8322 Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface 1.0 General Description The LM8322 Mobile I/O Companion is a dedicated device to unburden a host processor from scanning a matrix-addressed keypad. In addition, the LM8322 provides general-purpose I/O expansion, and PWM outputs useful for dynamic LED brightness modulation. www.DataSheet4U.com It communicates with the host through an I2C-compatible ACCESS.bus interface. An interrupt output is available for signaling key-press and key-release events. Communication frequencies up to 400 kHz (Fast-mode) bus speed are supported. The LM8322 supports a predefined set of commands.