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Service Manual
3 Principle Descriptions
Key panel is an important part for external data transmission. Key panel can be divided by features
into partial CPU circuit, DC/DC conversion circuit, key control circuit, coder control circuit, LED
drive circuit and A/D acquisition circuit.
CPU is the core of key panel, used to process various information. It contains one MCU
(NXP1764) chip and external circuits.
DC/DC provides different levels for key panel.
Key control circuit is hardware of key processing.
Coder control circuit converses mechanical actions to recognizable signals for MCU.
LED control circuit indicates LED status.
A/D acquisition circuit converses analogue signals provided by slide pots to recognizable signals
for MCU.
3.3 Software Description
3.3.1 Structure
Software system consists of hardware layer, operating system layer, intermediate layer and
application layer.
Ultrasound system applications + Associated applications
C++ CVSGtk
Gentoo OS
Hardware driver
Application
layer
Intermediate
layer
Operating
system layer
Hardware
layer
File
system
Task
management
RAM
management
Required
applications
Prerequisite
applications
ftp、cups
Computer platform + Ultrasound module + Control panel
Figure 3-12 Software System Structure
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