Mosaic embedded designs » Embedded controllers » Operator interfaces » Mosaic Handheld - battery powered handheld instrument

The Mosaic Handheld™ -
a customizable battery operated handheld computer

Mosaic portable handheld instrument controller with HMI

Notice: Legacy Product

The Mosaic Handheld is a legacy product not available for new customers. If you're looking for a HC11-based single-board computer programmable in C or Forth, consider Mosaic's QCard™ Controller. For a faster and more powerful platform with the same compatibility with our all of our Wildcard™ Modular I/O Boards, consider the PDQ Board™. Either controller may be used with Mosaic's Keypad/Display Wildcard™ to provide a similar interface to the Handheld in a form factor best suited to your application.

For existing customers looking for Mosaic Handheld documentation, see a summary of specifications below, or find the full Handheld documentation on Mosaic's Documentation Web.

Block Diagram

block diagram of Mosaic portable handheld instrument controller



  • 15 to 26 VDC, 17 W to charge batteries while operating
  • 0.5 W per additional Wildcard I/O module


6 2000mAh Rechargeable NiMH, 2 hour charge time. Will run the instrument for approximately:

  • 10 hours without any Wildcards
    and the backlight off
  • 6 hours without any Wildcards
    and the backlight on
  • 5 hours with 4 Wildcards
    and the backlight off
  • 4 hours with 4 Wildcards
    and the backlight on


  • 16 MHz Motorola 68HC11F1,
    2 MByte address space

Onboard Memory

  • 512K Flash and 512K RAM
    (optionally up to 1MB Flash)
  • 320 bytes of EEPROM

Memory Expansion

  • 64 or 128 MByte Wildcard
    compact flash mass memory

Real-Time Clock

  • Optional real-time clock


  • 21 interrupts support the 68HC11's on-chip subsystems

Keypad/Display User Interface

  • FSTN gray monochrome LCD display
    with software controlled backlight and brightness
  • 3.46" diagonal (2.44" x 2.44"),128 x 128 pixel display
  • 4 column by 8 row keypad with dedicated on/off key
  • Software controlled beeper for audible feedback
  • Custom keypads are available


  • A hardware UART supports either RS232 or RS485 at up to 19.2 Kbaud
  • A second software UART implements RS232 at up to 4800 baud
  • A fast synchronous serial peripheral interface (SPI) provides communications at speeds up to 2 Mbaud

Timer-Controlled Input and Output

  • 8 bitwise programmable I/O (2 used for the secondary serial port
  • 3 or 4 input capture functions
  • 4 or 5 output compare functions
  • Pulse accumulator

8-bit Analog to Digital Conversion

  • 8 input channels
  • Up to 100k samples per second
  • May be used as digital inputs


  • DB-25 connector - customizable for your I/O needs by installing jumper wires on the Personality Board
  • 2.1mm female power jack

Runtime Security

  • A watchdog timer and clock monitor ensures orderly reset after an error

I/O Expansion

Modular Wildcards provide additional I/O for:

  • 16- or 24-bit resolution A/D
  • 12-bit D/A
  • Isolated AC or DC solid state relays
  • 64 Mbyte Compact Flash
  • Logic level, high voltage, and high current digital I/O
  • Fully buffered dual RS232, RS422 or RS485 up to 56Kbaud


  • 2 lbs (0.9kg) with batteries installed, 1.5 lbs (0.7kg) without batteries


  • 4.6"/3.3" wide x 10.3" tall x 2.5" thick

Operating Conditions

  • 0-70 C (-40 to 80 C storage)
  • Humidity 0-90% RH, non-condensing

Documentation: Mosaic Handheld Users' Guide

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