LM8327 Texas instruments

LM8327

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LM8327

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Описание

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.

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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Supply voltage (min) (V)	1.62
Supply voltage (max) (V)	1.98
Rating	Catalog
Operating temperature range (°C)	-40 to 85