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LIFEPAK 20/20e Defibrillator/Monitor Device Description
Functional Description (continued)
A05 User Interface PCB
The A05 User Interface (UI) PCB is responsible for the presentation of the
acquired data to the screen display and to the printer, and for receiving all user
input. The primary communication between the UI PCB and the remainder of the
device is through the data bus. A RISC processor and digital memory make up
the CPU that manages communication with the A01 System Control PCB. The
W18 UI Flex Cable provides physical connection between the A05 UI PCB and
the A02 Patient Parameter PCB.
The major subsystems on the A05 UI PCB are as follows:
■ Power Supplies — The A05 UI PCB uses SW_VBatt (switched battery
voltage) from the A04 Therapy PCB to originate four power supplies for use
throughout the PCB as follows:
– +3.3 V logic power to drive the A11 Liquid Crystal Display (LCD) and the
A12 Printer
– +3.3 V logic power for the CPU processor and memory
– +2.5 V logic power for the field-programmable gate array
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