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Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface


Package | PIN: NYB | 36
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $2.65
10-24 $2.38
25-99 $2.21
100-249 $1.92
250-499 $1.78
500-749 $1.49
750-999 $1.22
1000+ $1.12


  • 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

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Texas Instruments  LM8323JGR8AXM/NOPB

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.