Sonoscape S30 - Touch-Screen Board; LED Indicator Board

20 Service Manual
3 Principle Descriptions
3.2.4 Touch-Screen Board
Touch-screen board is the core of the touch screen operations, it is based on ARM9 hardware
architecture and Linux operating system. You can implement some features by tapping buttons on
the touch screen.
AM1808
(ARM9)
SDRAM
FLASH
EEPROM
USB
RTC
LCD
LAN
UART
Figure 3-7 Touch-Screen Board Diagram
Parts in the above figure are described as follows,
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UART is used for communication among touch screen, keyboard and ultrasound system.
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USB interface is used for data communication of the USB device (USB flash drive) , through
which you can update the touch-screen software.
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RTC oscillator provides a working clock for RTC circuit on the chip.
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DDR/SDRAM storage provides the running space for the system applications, system and user
data are stored in DDR/SDRAM.
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Flash storage (NOR FLASH, EEPROM)
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LCD provides the user interfaces for operating instructions.
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LAN is a network interface for engineer debugging.
3.2.5 LED Indicator Board
LED indicator illuminates the keyboard. When the keyboard is pulled out, LED indicator is on.
When the keyboard is pushed in, LED indicator is off.