Dräger Babylog 8000 - Front Controller PCB (Babylog 8000;Babylog 8000 SC with LC Display)

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_ _Printed on_18.05.05_F61733XXT01.fm
46
Dräger Medical AG & Co. KGaA 6173.3
Function description Babylog 8000
10.8 Front Controller PCB
(Babylog 8000/Babylog 8000 SC with LC Display)
The Front Controller PCB reads in the keys of the potentiometer and display field, controls the LEDs of
the potentiometer and display field, powers the LC display with operating voltage (contrast), controls the
LC display backlight, and generates the control signal for the bargraph.
Fig. 22: Block diagram of the Front Controller PCB (Babylog 8000/8000 SC with LC display)
D
A
DC
AC
Contrast adjustment of LC display
LC display
voltage for
display illumination
key port
LED driver
Amplifier
Bargraph
Keys of the front panel and options switches
LEDs of the front panel
Alarm LEDs
Bargraph of the front panel
U
Ref
A
D
6x
Adress
decoder
Potentiometer of the front panel
U
B
Data bus
Control bus
and
Adress bus
Test A/D converter