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LM8327 Datasheet(PDF) 1 Page - Texas Instruments |
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LM8327 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 65 page  LM8327 www.ti.com SNLS329A – SEPTEMBER 2011 – REVISED MAY 2013 LM8327 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface Check for Samples: LM8327 1 FEATURES, KEY FEATURES, KEY DEVICE 2 • Internal RC Oscillator, no External Clock • 1.8V ± 10% Single-Supply Operation Required • On-Chip Power-On Reset (POR) • Internal PWM Clock Generation, no External • ESD Glitch Filter on RESETN Pin Clock Required • Watchdog Timer • Programmable I2C-compatible ACCESS.Bus • Dedicated Slow Clock Input for 32 kHz up to Address (Default 0x8A) 8MHz • Support for Keypad Matrices of up to of 8 x 12 • −40°C to +85°C Temperature Range Keys, Plus 8 Special Function (SF) Keys, for a • 36-pin csBGA Package Full 104 Key Support • Support for up to 26 Direct Connect Keys APPLICATIONS: • I2C-Compatible ACCESS.Bus Slave Interface at • Cordless Phones 100 kHz (Standard-Mode) and 400 kHz (Fast- • Smart Handheld Devices Mode) • Keyboard Applications • Three Host-Programmable PWM Outputs for Smooth LED Brightness Modulation DESCRIPTION • Supports General-Purpose I/O Expansion on The LM8327 GenI/O-Expander and Keypad Pins not Otherwise Used for Keypad or PWM Controller is a dedicated device to unburden a host Output processor from scanning a matrix-addressed keypad • 15-byte Key Event Buffer and to provide flexible and general purpose, host- programmable input/output functions. Three • Multiple Key Event Storage independent PWM timer outputs are provided for • Key Events, Errors, and Dedicated Hardware dynamic LED brightness modulation. Interrupts Request Host Service by Asserting It communicates with a host processor through an an IRQ Output I2C-compatible ACCESS.bus serial interface. It can • Automatic HALT Mode for Low Power communicate in Standard (100 kHz) and Fast-Mode Operation (400 kHz) in slave Mode only. • Wake-Up from HALT Mode on any Interface All available input/output pins can alternately be used (Rising Edge, Falling Edge or Pulse) as a direct key input connection, an input or an output • Three PWM Outputs with Dedicated Script in a keypad matrix, or as a host-programmable Buffer for up to 32 Commands general purpose input or output. • Register-Based Command Interpreter with Any pin programmed as an input can also sense Auto-Increment Address hardware interrupts. The interrupt polarity (“high-to- low” or “low-to-high” transition) is thereby FEATURES, HOST-CONTROLLED programmable. • PWM Scripting for Three PWM Outputs The LM8327 follows a predefined register based set • Period of Inactivity that Triggers Entry into of commands. Upon startup (power on) a configuration file must be sent from the host to setup HALT Mode the hardware of the device. • Debounce Time for Reliable Key Event Polling • Configuration of General Purpose I/O Ports • Various Initialization Options (Keypad Size, etc.) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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