Datasheet

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LA010802B © 2008 Navman Wireless OEM Solutions. All rights reserved. Proprietary information and specications subject to change without notice.
2.5 Electrical specication
Figure 2-4. Block diagram.
2.5.1 Graphics LCD display
The MDT-860 includes a monochrome graphical LCD display. The graphical display
allows the use of images, variable sized fonts and international fonts. This also allows the
user interface to be laid out in a more professional and user friendly manner.
The display has the following features:
• 320 x 240 pixels
• Four grey scale levels (white, light grey, dark grey, black)
• Wide viewing angle (FSTN LCD)
• Good daylight viewing (transective LCD)
• Variable level white LED backlighting (PWM controlled)
Because the contrast of an LCD screen is temperature dependant, the MDT-860 also
includes a thermistor temperature sensor. This enables the possibility of automatic
temperature compensation of the LCD contrast value.
2.5.2 Keypad
The MDT-860 has 21 keys and a 4-way cursor key. The keys are a conductive membrane
type. All keys have individual LED backlighting and are de-bounced.
The on/off key is a soft key. The application developer can congure the software to
control the power of any or all of the screen, piezo speaker, backlights, serial ports, and
keyboard sub processor when the on/off key is pressed. This feature allows the MDT-
860 to always be ready to receive serial data, or wake up periodically as the application
requires.
2.5.3 Audio output
The MDT-860 includes a piezo speaker. The software provides control of the frequency
and volume of the piezo speaker.
2.5.4 Main processor
The embedded processor is a Renesas M16C/62P series 16-bit processor (M30620SPFP)
running at 16MHz. Features include:
• 10KB internal RAM
• multiple serial ports
• multiple timers
M16
Processor
Power
Supply
Keypad
LCD
Keyboard
Sub-processor
Serial I/0
Driver
Flash ROM
EEPROM
RAM + Battery
+8 to 30 V supply
RS232
RS232 / RS485
PS/2 Keypad