Application notes
Version 8 dated 15.03.00 192
Siemens Information and Communication Products
A
2) BOOTCODEEN is active for about 100 ms immediately after a reset. After that time, the signal is inactive
1) A level converter is needed to adapt the signal voltages of the M20 to those of the serial interface cable.Shows a circuit
example.
2) For Pin numbering of the M20, 80 pole SMD plug see Fig. 0-1: Bottom view of M20 with 80 Pole SMD plug
3) The BOOTCODEEN pin (PIN 30) of the M20 must be connected to +2,8V (max +3.3V) for typ. 1.5 seconds, during
the power up of the M20 to enable SW download from the PC.
4) Ignition line has to be set HIGH (2,7V < Ignition < 6,2V) (max.50V) PIN 8 on the 80-pole SMD connector during the
entire SW download.
5) For information regarding the proper power connection of the M20 please refer to the Technical Description manual of
the M20/M20T, Chapter 4.
6) The next steps are described in Chapter 0.4 M20T: Booting for SW loading step 2) Setting Windows95 system variable
MEMIF to "1".
Fig. 8-1 Bottom view of M20 with 80 Pole SMD plug
8.5.2 M20Terminal
Software:
1) PC with Windows 95/98/NT operating system
2) Downloader: PCload32.exe
3) SW Update: sytem.mot
Hardware:
1) M20/M20T (incl. power supply)
2) Screwdriver or similar device to short BOOTCODEENABLE pads during power-up of M20.
3) Serial interface cable (M20T to PC: COM2)
8.5.3 M20T: HW Setup current HW
6-pole Western plug (female)//power supply, ignition, line-in/out
Pin Usage
1 Power supply 8-28.8 V
2 Audio Line Ground (for pin 3/AC:in & pin 5/AC:out)
3 (This Pin must not exceed Voltages >2V
to avoid power switched off!)
AC: Line-in input 600 Ohm
DC: Signal for power Off, power off for U (to pin6) >8V (ignition
low)
4 Ignition > 5V for longer than 1 s switches
on
Ignition signal (see M20: 80-pole connector Pin 8)
Ignition for U (to pin 6) >5V
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