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.