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LM8323 Datasheet(PDF) 1 Page - Texas Instruments |
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LM8323 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 46 page  LM8323 www.ti.com SNLS273A – JULY 2010 – REVISED MARCH 2013 LM8323 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface Check for Samples: LM8323 1 FEATURES Polling – Configuration of General-purpose I/O Ports 2 • Key Features – Various Initialization Options (Keypad Size, – Supports Keypad Matrices of up to 8 × 12 etc.) Keys Plus 8 Special-function (SF) Keys for a Total of 104 Keys. SF Keys Pull Keypad • Key Device Characteristics Scan Inputs Directly to Ground, Rather than – 1.8V ± 180 mV Single-supply Operation Connecting to a Keypad Scan Output. – On-chip Power-on Reset (POR) – Supports I2C-compatible ACCESS.bus – Watchdog Timer Interface in Slave Mode up to 400 kHz – Dedicated Slow Clock Input for 32 kHz (Fast-mode). – -40°C to +85°C Industrial Temperature – Three Host-programmable PWM Outputs Range Useful for Smooth LED Brightness – 36-pin csBGA Package Modulation. – Supports General-purpose I/O Expansion APPLICATIONS on Pins Not Otherwise Used for Keypad or Rotary Encoder Interface. • Cordless Phones – Key-scan Event Storage in a FIFO Buffer for • Smart Handheld Devices up to 15 Events. DESCRIPTION – Key Events, Errors, and Dedicated The LM8323 key-scan controller is a dedicated Hardware Interrupts Request Host Service device to unburden a host from scanning a matrix- by Asserting the IRQ Output. addressed keypad. In addition, the LM8323 provides – The Correct Reception of a Command May general-purpose I/O expansion, a rotary encoder be Assumed, if No Error is Reported from interface and PWM outputs useful for dynamic LED the LM8323 After Receiving it. brightness modulation. – Wake-up from Halt Mode on any Matrix It communicates with the host through an I2C- Key-scan Event, any Use of the SF Keys, or compatible ACCESS.bus interface. An interrupt Any Activity on the ACCESS.bus Interface, output is available for signaling key-press and key- or Any Change in the Rotary Encoder release events. Communication frequencies up to Counter Value (if Enabled). 400 kHz (Fast-mode) bus speed are supported. The LM8323 supports a predefined set of commands. • Host-Controlled Functions These commands enable a host device to keep – Three PWM Outputs control over all functions. – Period of Inactivity that Triggers Entry into Halt Mode – Debounce Time for Reliable Key Event 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 © 2010–2013, 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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