System Features
EPM-15 Reference Manual
23
Note:
The +3.3VDC, +12VDC and -12VDC inputs are required only for expansion
modules that require these voltages.
P
OWER
R
EQUIREMENTS
The EPM-15 requires only +5 volts (±5%) for proper operation. The voltage required for the
RS-232 ports is generated with an on-board DC/DC converter. A variable low-voltage supply
circuit provides power to the CPU and other on-board devices.
The exact power requirement of the EPM-15 depends on several factors, including memory
configuration, CPU speed, peripheral connections, type and number of expansion modules and
attached devices. For example, driving long RS-232 lines at high speed can increase power
demand.
L
ITHIUM
B
ATTERY
Warning!
To prevent shorting, premature failure or damage to the lithium battery, do not
place the board on a conductive surface such as metal, black conductive foam or
the outside surface of a metalized ESD protective pouch. The lithium battery may
explode if mistreated. Do not recharge, disassemble or dispose of in fire. Dispose
of used batteries promptly.
Normal battery voltage should be at least 3.0V. If the voltage drops below 2.7V, contact the
factory for a replacement (part number T-HB3/0-1). The life expectancy under normal use is
approximately 10 years.
CPU
The AMD LX microcontroller has a 32-bit, low-voltage AMD x86 microprocessor at its core.
The maximum clock rate on the LX 800 is 500 MHz actual, with 800 MHz (Celeron equivalent)
performance. The processor features 64 KB of L1 cache, 128 KB of L2 cache, DDR SDRAM
support, and an integrated display controller. Typical power consumption is 1.6W.
System RAM
The EPM-15 has soldered-on DDR SDRAM with the following characteristics:
Storage Capacity
256 MB
Voltage
2.6V
Type
Unbuffered PC2100 (DDR266) or PC2700 (DDR333)
CMOS RAM
C
LEARING
CMOS
RAM
You can move the V2 jumper to position [2-3] for a minimum of three seconds to erase the
contents of the CMOS RAM and the Real-Time Clock. When clearing CMOS RAM: 1) Power
off the EPM-15. 2) Install the jumper on V2[2-3] and leave it for four seconds. 3) Move the
jumper to back to V2[1-2]. 4) Power on the EPM-15.
