Datasheet
LA010802B © 2008 Navman Wireless OEM Solutions. All rights reserved. Proprietary information and specications subject to change without notice.
2.5.5 Non-volatile memory
The NAVMAN MDT-860 offers:
• Flash memory – 1664KB organized as 2x 832kB pages for program storage.
• RAM - 10KB internal processor RAM, 248KB battery backed RAM organized as 2 x
124KB pages.
• EEPROM - 32KB for data / conguration parameter storage
2.5.6 Sub processor
The MDT-860 contains an additional keyboard sub processor. This is used for the PS/2
keyboard communication. It is an Atmel ATtiny2313 microcontroller and is a low-power
CMOS chip based on the AVR RISC architecture. This typically draws no more than 6mA
at 5V.
The sub processor of the MDT-860 features:
• 2KB of in-system programmable Flash
• 128B internal SRAM
• 128B in-system programmable EEPROM
• Operates at 8MHz.
2.5.7 Power supply
The MDT-860 series is always powered on whenever the DC supply is connected. The
device can appear to be powered on or off by turning off the LCD, backlight etc in software.
The overall current consumption is dependant on how the application developer programs
the use of the LCD, backlights, RS232 drivers etc.
• Input voltage range +8 to 30V DC
• Reverse polarity protected
The power supply of the MDT-860 has been designed to tolerate typical automotive
transients and has been tested to EN 50082-1. The MDT-860 complies with ISO 7637-1
with the exception of pulse 6. The ISO 7637-1 level used for conformance acceptance is:
• Clause 3.3.1, gure 1 -use 100 for Rs1
• Clause 3.3.2, gure 2 -use 2 for Rs2
2.6 Connectors
There are 3 connectors located on the underside of the MDT-860. The connectors are:
• Two RJ45 sockets (Female 8P8C)
• One RJ12 socket (Female 6P6C).
2.6.1 Serial ports
The two serial ports are available for connection via the two RJ45 sockets. Both serial
ports feature RTS and CTS handshaking lines. The maximum speed of the serial ports is
115K BPS.
Both connectors include a connection to the single RS485 serial port.
The left hand RJ45 connector contains RS232 serial port 1, and a connection to RS485
serial port 0.
The right hand connector contains RS232 serial port 0, and a connection to RS485 serial
port 0. Serial port 0 is software selectable between RS232 or RS485 and only one is
operational at a time.
The RS485 connection is directly connected internally between both of the RJ45 sockets.
Power may be supplied to either of the RJ45 sockets as these are also directly connected
internally.