Theory of operation
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9.3.1 CPU carrier board
DC/DC subsystem
The DC/DC subsystem takes care of the following voltage conversions.
The VSYS voltage is converted to +5V and +3.3. V supply voltages by a step-down converter:
•
+5V is supplied for the external USB connectors, alarm light board, audio amplifier and for
the optional WLAN module and recorder.
•
+3.3V is supplied for the DC/DC board, alarm light board, CPU carrier board and LCD
display.
The +5V is converted to +1.8V and +1V supply voltages by a step-down converter:
•
+1.8V is supplied for the Ethernet and EMBC subsystem.
•
+1V is supplied for the Ethernet subsystem.
The +3.3V is converted to +12V and -12V voltages for the direct ECG and Invasive BP analog
outputs.
+5V, +3.3V, +1.8V and +1V supply voltages have over-voltage and short-circuit protection. The
CPU carrier board has also the circuit breakers for the VSYS_EPORT and VSYS_PDM supply
voltages.
EMBC subsystem
The Ethernet module bus controller (EMBC) section in the CPU board has its own micro
controller. It has serial flash memory for the EMBC bootloader software, NAND flash for EMBC
application software and Linux kernel and SDRAM to run time EMBC code execution and
temporary data storage.
The EMBC section takes care of the following CPU services:
•
It provides serial communication for the optional built-in recorder.
•
It provides RS-485 module bus communication for the E-modules and PSM module.
•
It provides analog ECG and invasive pressure outputs and a digital marker-out
signal for a user-supplied equipment, for example a defibrillator or an intra-aortic
balloon pump that is connected to
EMBC application software controls the EMBC related. The EMBC software is included in the
host software package and upgradeable via software CD.
The EMBC section communicates with the main processor in CPU module using Ethernet
communication.
Display subsystem
The display controller is integrated to the CPU Module. It provides LVDS (Low Voltage
Differential Signaling) and SDVO (Serial Digital Video Out) output to the CPU Carrier Board.
The display subsystem in the CPU Carrier Board takes care of the following functions:
•
It passes the LVDS signal lines and the +3.3 V supply voltage to the integrated 12.1" LCD
display via the display cable.
•
It has a SVDO - DVI transmitter that encodes the video signal for the external digital
display that is connected to the DVI-D connector.
•
It has the LED drivers for the LED backlight unit in the LCD display and controls the display
brightness. The backlight cable is connected to the DC/DC board.
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