Your ePlatform Partner
User’s Manual for Advantech SOM-A2552 series module V1.00
stereo line-out interface. If users want to drive speakers, users could follow the “Advantech SOM-A255x series CSB design guide “to design the audio amplifier on CSB.
2.2.9 CRT-out
SOM-A255F & SOM-A2552 series supplies CRT-out I/F which resolution is up to 1024*768. CRT-out function comes from SM501. CRT-out signals are all analog signals; user must follow the analog signals layout rules.
SOM-A2558 series doesn’t support CRT-out function, but user could design CRT-out solution IC on CSB to add the function on SOM-A2558 platform. About detail implement way, please check “Advantech SOM-A255x series CSB design guide “.
2.2.10LCD TTL interface w/LCD Brightness & Contrast Control interface
SOM-A2552 & SOM-A255F series LCD-out interface comes from SM501. SOM-A2552 & SOM-A255F LCD-out supports 24 bit and resolution up to 1024*768. SOM-A2552 & SOM-A255F supports both active and passive LCD displays. SOM-A2558 series LCD-out function comes from SoC PXA255. SOM-A2558 LCD-out supports 16 bit and resolution up to 800*600.
The LCD signals are 3.3V level in X2. If users’CSB want to drive 5V level panel, users could design buffers on CSB to translate LCD signals level. User could refer “Advantech SOM-A255x series CSB design guide “.
Advantech design LCD brightness control circuit & LCD contrast control circuit on SOM-A255x series modules. STN LCD panel needs contrast control signals. In X2, LCD contrast control signals are nVCONR_INC, VCONR_CS and VCONR_UnD. The control signals are based on DALLAS DS1804 NV Trimmer Potentiometer to design. Users could check the “Advantech SOM-A255x series CSB design guide “ to know how to wire. User could check “to know how to control.
Brightness control signals are used to control the LCD backlight inverter lamp current. In X2, LCD brightness control signals are nVBRIR_INC, VBRIR_CS and nVBRIR_UnD. The control signals are based on DALLAS DS1804 NV Trimmer Potentiometer to design. Users could check the “Advantech SOM-A255x series CSB design guide “to know how to wire. User could check appendix about SOM-A255F memory map to know how to control.
If user wants to connect CSB to LVDS type LCD, user could reference “Advantech SOM-A255x series CSB design guide “to design LVDS Transmitter on CSB. SOM-A255x series only support 1 channel LVDS LCD panel.
The sample images of SOM-A2552, SOM-A255F series could support 4 kinds of display modes:
•320x240 TFT: In SOM-A2552 & SOM-A255F module, user CAN’T verify the performance by Advantech LCD kit LCD-A057-STQ1-0. Because SOM-A2552 & SOM-A255F supports 320x240 TFT mode, but LCD-A057-STQ1-0 is 320x240 STN panel.
•640x480 TFT: user could verify the performance by Advantech LCD kit LCD-A064-TTV1-0.
