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Mobile I/O Companions

Overview

Mobile I/O Companion devices are peripherals developed to expand host processor functionality while reducing system power consumption

  • Programmable functions offered:
    • General Purpose I/Os
    • Keyboard Scanning and Event storage
    • Complex sequence of PWM duty cycle generation
  • Use extremely low power in operational and standby modes
  • Communicate to host via I2C compatible ACCESS.bus interface
  • Offered in ultra low profile micro-Array and LLP packages

Key Benefits

  • Saving host valuable processing power by offloading keyscan and PWM programming functions
  • Enabling Host to enter low power stand by mode, while Mobile I/O intercepts external events
  • Expanding Host processor functionality with additional General Purpose I/Os, Complex PWMs, Key-scan
  • Enabling modular System design since Mobile I/O Companion routines and circuitry layout can be reused
  • Increasing application board layout flexibility by enabling more options for placement of a host device
  • The host processor requires significantly less pins. It can refer to standard functions via only two/three connections (pins)
2.25 V - 2.75 V 72 8 4 400 kHZ 1 16 Bytes 1* Y Y N 49 Micro-Array,
4 mm  x 4 mm x 1 mm		 LM8333EVALKIT
2.25 V - 2.75 V 72 8 4 400 kHZ 1 16 Bytes 1* Y Y N 32 LLP,
6 mm x 6 mm x  0.8 mm		 LM8333EVALKIT
1.62 V - 1.98 V 104 8 16* 400 kHZ 4 16 Bytes 3* Y Y Y 36 Micro-Array,
3.5 mm x 3.5 mm x 1 mm		 LM8322EVALKIT

* Multiplexed

Key Features

  • Support keypad matrices of up to 8 x 12 keys plus eight special-function (SF) keys for a total of 104 keys
  • Support I2C-compatible ACCESS.bus interface in slave mode at 400 kHz (Fast-mode)
  • Up to Three host-programmable PWM outputs for brightness control in backlight
  • Support general-purpose I/O expansion
  • Key-scan event storage in a FIFO buffer for up to 15 events
  • Key events, errors, and dedicated hardware interrupts request host service by asserting the IRQ output
  • Wake-up from Halt mode on any matrix key-scan event, any use of the SF keys, or any activity on the ACCESS.bus interface

Applications

  • Mobile phones
  • Personal Digital Assistants (PDAs)
  • Smart handheld devices
  • Personal media players

Evaluation Kits

  • Include HW and SW for quickly evaluating Mobile I/O Devices
  • Software for the Host PC provides a graphical user interface for exercising all functions
  • Evaluation board with USB interface to a host PC
  • Ordering Part Number (NSID):

LM8322 Three PWM Duty Cycle Outputs