System Features
Bengal (VL-EPMe-30) Reference Manual
20
Power Requirements
The Bengal requires only +5 VDC (±5 %) for proper operation, as required by the PC/104-
Plu
s
specification. Variable low-voltage supply circuits provide power to the CPU and other on-board
devices.
The exact power requirement of the VL-EPMe-30 depends on several factors, including memory
configuration, CPU clock rate, peripheral connections, and the type and number of expansion
modules and attached devices. For example, driving long RS-232 lines at high speed can
increase power demand.
Power Delivery Considerations
Using the VersaLogic approved power supply (VL-PS200-ATX) and power cable (VL-CBR-1008)
ensures high quality power delivery to the board. Customers who design their own power delivery
methods should take into consideration the guidelines below to ensure good power connections.
In addition, the specifications for typical operating current do not include any off-board power
usage that may be fed through the Bengal power connector. Expansion boards and USB devices
plugged into the board will source additional power through the Bengal power connector.
Do not use wire smaller than 22 AWG. Use high quality UL 1007 compliant stranded wire.
The length of the wire should not exceed 18 inches.
Avoid using any additional connectors in the power delivery system.
The power and ground leads should be twisted together, or as close together as possible
to reduce lead inductance.
A separate conductor must be used for each of the power pins.
All power input pins and all ground pins must be independently connected between the
power source and the power connector.
Use a high quality power supply that can supply a stable voltage while reacting to widely
varying current draws.
CPU
The Bengal uses one of three Intel 4th Generation Atom
(formerly “Bay Trail”) system-on-chip
(SoC) processors:
E3845 (quad core)
E3826 (dual core)
E3815 (single core)
Each core contains a 512 KB L2 cache. These processors support Intel 64-bit instructions, AES
Instructions, Execute Disable Bit, and Virtualization Technology.
See the
Intel Atom Processor E3800 Product Family Datasheet
for a complete description of
the CPU.
Note:
If the above link to the datasheet becomes inactive, search the internet for “Intel Bay Trail” or
“E3800” and follow the results to the Intel site and datasheet.
