LM8330
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.
Key Features
- 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 - 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)
