DIGITAL-LOGIC MICROSPACE MSM286 Series Technical User's Manual page 18

DIGITAL-LOGIC AG
4.5 DC Power Input
The power is connected through the AT96 Bus connector, the PC/104 Power connector or the sepa-
rate power connector on the board. The supply uses only the +5 volts and ground connection. The
LCD-BIAS voltage is generated on-board from the 5 volt or from 12 volt (better quality).
CAUTION:
Tolerance of 5 V supply:
ATTENTION:
4.6 Power Requirements
The precise power requirements of the MICROSPACE MSM286 depend on a number of factors, in-
cluding what functions are present on the board and what peripherals are connected to the board's I/0
ports: for example, AT keyboards draw their power from the keyboard connector on the
MICROSPACE MSM286, and therefore add keyboard current to the total power drawn by the board
from its power supply.
MSE286 MSM286
CPU / Clock: Memory:
With CGA
F8680A-14 MHz 2 MBytes DRAM
F8680A-14 MHz 2 MBytes DRAM
F8680A-14 MHz 2 MBytes DRAM
F8680A-14 MHz 2 MBytes DRAM
With VGA (MSE520)
F8680A-14 MHz 2 MBytes DRAM
F8680A-14 MHz 2 MBytes DRAM
F8680A-14 MHz 2 MBytes DRAM
F8680A-14 MHz 2 MBytes DRAM
HD Startcurrent: ST-9096A Seagate 2,5"80 MBytes
XT-Keyboard:
AT-Keyboard:
Be sure the power plug is correctly wired before supplying power to the
board. A built-in diode protects the board against reverse polarity.
5 Volt ± 5%; Power-fail signal starts at ± 10% of 5 volt norm and gene-
rates a reset status for the MICROSPACE.
With harddisk connected at the IDE 44 pins interface, the power re-
quirement is high. The peak current must be enough to spin up the HD-
motor. The typical spin-up current of the harddisk is 0.8 - 1.5Amp at 5V.
Too little current will drop the voltage to under 5 volts for a short time.
Due to this undervoltage, the system or the harddisk stops or falters. The
VGA could also be "snowy".
CPU: HD Access:
100% 100%
100% 0%
10% (Drowsy)
SLEEP
100% 100%
100% 0%
10% (Drowsy)
SLEEP
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MSM286 Manual V6.4
With Keyboard and
With HD: Without HD: and no HD:
750mA
580mA 440mA
390mA 250mA
250mA 220mA
980mA
850mA 730mA
650mA 530mA
450mA 440mA
ca. 0.8 Amp.
ca. 120mA
ca. 120mA
no Keyboard
320mA
130mA
100mA
620mA
410mA
330mA