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csBGA (NYB) 36 12 mm² 3.5 x 3.5
  • 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.
    • Key Events, Errors, and Dedicated Hardware Interrupts Request Host Service by Asserting the IRQ Output.
    • The Correct Reception of a Command 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, or Any Change in the Rotary Encoder Counter Value (if Enabled).
  • Host-Controlled Functions
    • Three PWM Outputs
    • Period of Inactivity that Triggers Entry into Halt Mode
    • Debounce Time for Reliable Key Event Polling
    • Configuration of General-purpose I/O Ports
    • Various Initialization Options (Keypad Size, etc.)
  • Key Device Characteristics
    • 1.8V ± 180 mV Single-supply Operation
    • On-chip Power-on Reset (POR)
    • Watchdog Timer
    • Dedicated Slow Clock Input for 32 kHz
    • -40°C to +85°C Industrial Temperature Range
    • 36-pin csBGA Package

All trademarks are the property of their respective owners.

  • 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.
    • Key Events, Errors, and Dedicated Hardware Interrupts Request Host Service by Asserting the IRQ Output.
    • The Correct Reception of a Command 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, or Any Change in the Rotary Encoder Counter Value (if Enabled).
  • Host-Controlled Functions
    • Three PWM Outputs
    • Period of Inactivity that Triggers Entry into Halt Mode
    • Debounce Time for Reliable Key Event Polling
    • Configuration of General-purpose I/O Ports
    • Various Initialization Options (Keypad Size, etc.)
  • Key Device Characteristics
    • 1.8V ± 180 mV Single-supply Operation
    • On-chip Power-on Reset (POR)
    • Watchdog Timer
    • Dedicated Slow Clock Input for 32 kHz
    • -40°C to +85°C Industrial Temperature Range
    • 36-pin csBGA Package

All trademarks are the property of their respective owners.

The LM8323 key-scan controller is a dedicated device to unburden a host from scanning a matrix-addressed 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 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 LM8323 supports a predefined set of commands. These commands enable a host device to keep control over all functions.

The LM8323 key-scan controller is a dedicated device to unburden a host from scanning a matrix-addressed 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 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 LM8323 supports a predefined set of commands. These commands enable a host device to keep control over all functions.

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Type Title Date
* Data sheet Mobile I/O Comp Supp Keyscan, I/O Expansion, PWM, & ACCESS.bus Host I/F datasheet (Rev. A) 26 Mar 2013
Application note Understanding the I2C Bus 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation 13 Feb 2015

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