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User’s Manual for Advantech SOM-A2558 series module V1.00
14
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-A2558 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-A2558 series products have 3 kinds of
operating model :
l Normal mode: I/O and system all work well. All components 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.