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Functional description
Document No. 8000060-1
1
1 FUNCTIONAL
DESCRIPTION
1.1 General
The power supply board distributes power to all units in the Light Monitor.
The power source is either an external power adapter, or one of the two rechargeable batteries
(optional). If the monitor is used with mains power and the power cord is disconnected, operation
continues with batteries without interruption. When the power cord is plugged in again, batteries
are recharged automatically.
The external operating voltage must be between 12.3 and 14.5 V. If the voltage drops to 11.8 V,
the monitor switches to battery operation or shuts down if there are no batteries connected.
The power supply board co12 V main voltage to +3.3 V, 2A and +5 V, 2 A voltages. All
voltages have a common ground. If overvoltage occurs in the output, the power supply board turns
itself off automatically.
The power supply board reads the status of the keyboard and the ComWheel, and sends the
information to the CPU board. Communication takes place on the CMOS-level serial
communication line. Only two signals, TXDP and RXDP, are used without handshaking. The
communication speed is 9600 bps. The board also drives alarm LEDs according to the messages
sent by the CPU board. The power supply board also drives the charge indicator LEDs.
The microprocessor on the power supply board is of the type N87C51FB and the oscillator
frequency is 11.059 MHz.
The module and serial I/O buffers are also located on the power supply board.
The nominal voltage of the battery is 13.2 V, capacity 1800 mAh. The nominal voltage of the
backup battery is 13.2 V, capacity 800 mAh.
1.2 Voltages
1.2.1 Input power sources
The input power sources of the Light Monitor are the external power supply, external vehicle
adapter or one of the two NiCd batteries (
). The external power supply and the vehicle
adapter are optional with each other so they can’t be used simultaneously.
Batteries are charged with the constant current limited by the external power source.
Input voltage requirement:
12.3...14.5 VDC, V
ripp
= 200 mV, 2.5 A (min).
Charge input voltage:
18.0...22.0 VDC, V
ripp
= 100 mV, current limited
to 600 mA
±
2.5 % (constant current source).
Summary of Contents for F-LM1
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