Home Interface I2C & I3C ICs I2C general-purpose I/Os (GPIOs)
Home
Interface
I2C & I3C ICs
I2C general-purpose I/Os (GPIOs)

LM8328

ACTIVE

Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, and ACCESS.bus Host Interface

Order now
Data sheet

LM8328

ACTIVE
Data sheet Order now

Product details

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
DSBGA (YFQ) 25 4.84 mm² 2.2 x 2.2
  • KEY FEATURES
    • Internal RC Oscillator, No External Clock Required
    • Internal PWM Clock Generation, No External Clock Required
    • External Reset for System Control
    • 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
    • Reset Input for System Control
    • 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
    • −40°C to +85°C Temperature Range
    • 25-pin DSBGA 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
    • External Reset for System Control
    • 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
    • Reset Input for System Control
    • 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
    • −40°C to +85°C Temperature Range
    • 25-pin DSBGA Package

All trademarks are the property of their respective owners.

The LM8328 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 LM8328 follows a predefined register based set of commands. Upon start-up (power - on) a configuration file must be sent from the host to setup the hardware of the device.

The LM8328 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 LM8328 follows a predefined register based set of commands. Upon start-up (power - on) a configuration file must be sent from the host to setup the hardware of the device.
open-in-new Find other I2C general-purpose I/Os (GPIOs)
Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* Data sheet LM8328 Mobile I/O Companion Supporting Keyscan, I/O Expansion, PWM, & ACCESS.bus 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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Request
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
View options
Package Pins Download
DSBGA (YFQ) 25 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos