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E/S de propósito general (GPIO) I2C

LM8325-1

ACTIVO

Mobile I/O Companion compatible con Key-Scan, expansión de E/S, PWM e interfaz de host ACCESS.bus

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LM8325-1

ACTIVO
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Detalles del producto

Supply voltage (min) (V) 1.62 Supply voltage (max) (V) 1.98 Rating Catalog Operating temperature range (°C) -40 to 85
Supply voltage (min) (V) 1.62 Supply voltage (max) (V) 1.98 Rating Catalog Operating temperature range (°C) -40 to 85
CS-BGA (NYA) 25 9 mm² 3 x 3
  • KEY FEATURES
    • Internal RC Oscillator, No External Clock Required
    • Internal PWM Clock Generation, No External Clock Required
    • Programmable I2C-compatible ACCESS.bus Address (Default 0x88)
    • Support for Keypad Matrices of up to of 8 x 12 Keys, Plus 8 Special Function (SF) Keys, for a Full 104 Key Support
    • 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
  • HOST-CONTROLLED FEATURES
    • 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)
    • Watchdog Timer
    • Dedicated Slow Clock Input for 32 kHz to 2MHz
    • −40°C to +85°C Temperature Range
    • 25-pin csBGA Package

All trademarks are the property of their respective owners.

  • KEY FEATURES
    • Internal RC Oscillator, No External Clock Required
    • Internal PWM Clock Generation, No External Clock Required
    • Programmable I2C-compatible ACCESS.bus Address (Default 0x88)
    • Support for Keypad Matrices of up to of 8 x 12 Keys, Plus 8 Special Function (SF) Keys, for a Full 104 Key Support
    • 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
  • HOST-CONTROLLED FEATURES
    • 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)
    • Watchdog Timer
    • Dedicated Slow Clock Input for 32 kHz to 2MHz
    • −40°C to +85°C Temperature Range
    • 25-pin csBGA Package

All trademarks are the property of their respective owners.

The LM8325-1 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 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 LM8325-1 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.

The LM8325-1 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 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 LM8325-1 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.
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Tipo Título Fecha
* Data sheet Mobile I/O Companion Support Keyscan, I/O Expansion, PWM, & ACCESS.bus Host I/F datasheet (Rev. A) 26 mar 2013
Application note Understanding the I2C Bus PDF | HTML 30 jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 may 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML 13 feb 2015

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