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LM8323 - key-scan controller

General Description

The LM8323 key-scan controller is a dedicated device to unburden a host from scanning a matrixaddressed keypad.

In addition, the LM8323 provides general-purpose I/O expansion, a rotary encoder interface and PWM outputs useful for dynamic LED brightness modulation.

Key Features

  • 1.
  • 2 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).
  • Three Host-programmable PWM Outputs Useful for Smooth LED Brightness Modulation.
  • Supports General-purpose I/O Expansion on Pins Not Otherwise U.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LM8323 www.ti.com SNLS273A – JULY 2010 – REVISED MARCH 2013 LM8323 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface Check for Samples: LM8323 FEATURES 1 •2 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). – Three Host-programmable PWM Outputs Useful for Smooth LED Brightness Modulation. – Supports General-purpose I/O Expansion on Pins Not Otherwise Used for Keypad or Rotary Encoder Interface. – Key-scan Event Storage in a FIFO Buffer for up to 15 Events.