1FEATURES

2• KEY FEATURES

– Keypad Matrices of up to of 8 x 12 Keys,

Plus 8 Special Function (SF) Keys, for a

Full 104 Key Support.

– Supports General-purpose I/O Expansion

on Pins Not Otherwise Used for Keypad or

PWM Output.

– Keypad Matrix and Dedicated Key Support:

– 16-Event Keycode Buffer

– 4-Event Multiple Key Storage Registers

– Internal Oscillator, No External Clock

Required.

– I2C-compatible ACCESS.bus Slave Interface

Standard (100 kHz) and Fast (400 kHz)

Modes:

– 7-bit and 10-bit Addressing

– Programmable Slave Address

– (Default 7-bit 0x88, 10-bit 0x088)

– Three Host-programmable PWM Outputs

– Smooth LED Brightness Modulation

– Dedicated 31-command Script Bugger

– Register-based Command Interpreter

with Auto-increment Addressing

– Key Events, Errors, and Dedicated

Hardware Interrupts, Request Host Service

by Asserting an IRQ Output

– Ultra-Low-Power Operation

– Automatic HALT Mode: 1.5 μA (typ.)

– Active Supply Current: 23 μA (typ.)

– Configurable Wake-Up from HALT

Operation

– IEC61000-4-2 ESD Protection on KPX[7:0]

and KPY[10:0] pins

– ESD Glitch Filter on RESETN Input to–

External Reset for System Control

• HOST-CONTROLLED FEATURES

– Reset Input for System Control

– 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.)

• KEY DEVICE FEATURES

– 1.8V ±10% Single-supply Operation

– On-chip Power-on Reset (POR)

– −30°C to +85°C Temperature Range

– Robust IEC ESD Protection: ±8 kV Direct

Contact on KPX[7:0] and KPY[10:0] Pins

– 25-pin DSBGA Package Size: 2 mm x 2 mm

x 0.6 mm (0.4 mm Pitch)

APPLICATIONS:

• Mobile Phones

• Qwerty Keyboard

• Universal Remote

DESCRIPTION

The LM8330 I/O - Expander and Keypad Controller is

a dedicated device designed 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 Pulse Width Modulation (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 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-to–

low” or “low-to-high” transition) is thereby

programmable.

The LM8330 follows a predefined register-based set

of commands. Upon startup (power-on) a

configuration file must be sent from the host to set up

the hardware of the device.