LM8327数据手册集成电路（IC）的专用规格书PDF

描述 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-to-low” 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.

特性 Features

·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
·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
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