LM8323 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. It municates with the host through an I2Cpatible ACCESS.bus interface.
LM8323 Key Features
- 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 Ke
- Supports I2C-patible 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
- Key Events, Errors, and Dedicated Hardware Interrupts Request Host Service by Asserting the IRQ Output
- The Correct Reception of a mand May be Assumed, if No Error is Reported from the LM8323 After Receiving it
- Wake-up from Halt Mode on any Matrix Key-scan Event, any Use of the SF Keys, or Any Activity on the ACCESS.bus Interface
- Host-Controlled Functions