Specifications

Little Board/P5i Technical Manual
2–6
2.2 DC POWER
The power connector J10 is a 7-pin polarized connector. Refer to
Table 2–3 for power connections and Table 2–4 for mating connector information.
Caution
Be sure the power plug is wired correctly before applying power to
the board! See Table 2–3.
Table 2–3 Power Connector (J10)
Pin Signal Name Function
1, 7 +5VDC +5VDC ±5% input
2, 3, 6 Ground Ground return
4 +12VDC +12VDC ±5% input
5 +3.3VDC +3.3V ±5% input
(Only required for PCI expansion boards)
Table 2–4 J10 Mating Connector
Connector Type Mating Connector
DISCRETE WIRE MOLEX HOUSING 09-50-8073
Pins 08-52-0071
2.2.1 Power Requirements
The Little Board/P5i requires only +5VDC (±5%) for operation. The voltage required for the RS232
ports is generated on-board from the +5VDC supply. An onboard +5V to +12V converter supplies power
for programming Flash EPROMs. An onboard 3.3V/3.1V dual voltage supply circuit provides power to
the low-voltage CPU and other onboard components.
The exact power requirement of the Little Board/P5i system depends on several factors, including the
installed byte-wide memory devices, SCSI bus termination, CPU speed, the peripheral connections, and
which, if any, MiniModule products or other expansion boards are attached. For example, AT keyboards
draw their power from the board, and there can be some loading from the serial and parallel ports.
Consult the specifications in Chapter 1 for the basic power requirements of your model.
Other Voltages
There may be a requirement for an external +12 volt supply, depending on what peripherals you connect
to the Little Board system. For instance, +12V is required for most flat panel backlight power supplies
and for an external Ethernet LAN MAU device connected to the Ethernet controller AUI interface. You