1FEATURES, KEY
2• Internal RC Oscillator, no External Clock
Required
• Internal PWM Clock Generation, no External
Clock Required
• Programmable I2C-compatible ACCESS.Bus
Address (Default 0x8A)
• Support for Keypad Matrices of up to of 8 x 12
Keys, Plus 8 Special Function (SF) Keys, for a
Full 104 Key Support
• Support for up to 26 Direct Connect Keys
• I2C-Compatible ACCESS.Bus Slave Interface at
100 kHz (Standard-Mode) and 400 kHz (Fast-
Mode)
• Three Host-Programmable PWM Outputs for
Smooth LED Brightness Modulation
• Supports General-Purpose I/O Expansion on
Pins not Otherwise Used for Keypad or PWM
Output
• 15-byte Key Event Buffer host•
Multiple Key Event Storage
• Key Events, Errors, and Dedicated Hardware
Interrupts Request Host Service by Asserting
an IRQ Output
• Automatic HALT Mode for Low Power
Operation
• Wake-Up from HALT Mode on any Interface
(Rising Edge, Falling Edge or Pulse)
• Three PWM Outputs with Dedicated Script
Buffer for up to 32 Commands
• Register-Based Command Interpreter with
Auto-Increment Address
FEATURES, HOST-CONTROLLED
• PWM Scripting for 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.)
FEATURES, KEY DEVICE
• 1.8V ± 10% Single-Supply Operation
• On-Chip Power-On Reset (POR)
• ESD Glitch Filter on RESETN Pin
• Watchdog Timer
• Dedicated Slow Clock Input for 32 kHz up to
8MHz
• −40°C to +85°C Temperature Range
• 36-pin csBGA Package

APPLICATIONS:
• Cordless Phones
• Smart Handheld Devices
• Keyboard Applications

DESCRIPTION
The LM8327 GenI/O-Expander and Keypad
Controller is a dedicated device to unburden a host
processor from scanning a matrix-addressed keypad
and to provide flexible and general purpose, host•
programmable input/output functions. Three
independent PWM timer outputs are provided for
dynamic LED brightness modulation.
It communicates with a host processor through an
I2C-compatible ACCESS.bus serial interface. It can
communicate in Standard (100 kHz) and Fast-Mode
(400 kHz) in slave Mode only.
All available input/output pins can alternately be used
as a direct key input connection, an input or an output
in a keypad matrix, or as a host-programmable
general purpose input or output.
Any pin programmed as an input can also sense hardware interrupts. The interrupt polarity (“high-tolow”
or “low-to-high” transition) is thereby
programmable.
The LM8327 follows a predefined register based set
of commands. Upon startup (power on) a
configuration file must be sent from the host to setup
the hardware of the device.