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User’s Manual for Advantech SOM-A2552 series module V1.00
13
Most users will question the height of SOM structure product. Does
product be too thick based on SOM structure product? User could see the
answer in the 3
rd
mechanical drawing. Maximum height of SOM module allied
with CSB is 5.20mm. One port USB 1.1 host connector height is 8.37mm, 1
DB-9 RS-232 connector is 12.53mm, 1 type-II CF slot is 8.72mm. So, this is
the answer! If users want to use any standard I/O connector on CSB, then
SOM structure is not the maximum height maker. The maximum highness is
decided by I/O connector, not SOM structure.
1.2.2 Power System Requirement
SOM-A2552 Operating DC value table
Symbol Description Min. Typ.
Max.
SYS_VCC3P
3
SOM system DC 3.3V DC-in
power source 3 3.3 3.6
SYS_VCC
SOM system DC 5.0V DC-in
power source 4.5 5.5 5.5
BAT_VCC
Back-up power source for RTC &
SDRAM -
SYS_VC
C3P3
Input DC Operating Conditions
VIH
Input High Voltage, all standard
input and I/O pins
0.8*VCC
VCC
VIL
Input Low Voltage, all standard
input and I/O pins VSS
0.2*VCC
Output DC Operating Conditions
VOH
Output High Voltage, all standard
output and I/O pins VCC-0.1
VCC
VOL
Output Low Voltage, all standard
output and I/O pins VSS
VSS+0.4
1.2.3 Power Consumption
In WinCE O.S. environment, SOM-A2552 series products have 3 kinds of
operating model :
l Normal mode: I/O and system all work well. All component on
SOM-A55x are powered.
l Idle mode: I/O and system all work well except backlight control
circuit. In order to do power-saving, LCD backlight control circuit
will disable the LCD backlight inverter.
l Suspend mode: all devices are no-powered except SDRAM,
RTC(real time clock) & some CPU(PXA255) power pins. In
suspend mode, SOM-A255x series are only powered by
BAT_VCC pin ( Li-ion 3.0V coin battery from CSB).If user doesn’t
design coin battery to power BAT_VCC pin, then Suspend mode
doesn’t work on SOM-A55x series products.
About detail power consumption of every SOM-A255x series, please
contact with ae.risc@advantech.com.tw.