Intel iSBC 655, Справочник по аппаратуре

Страница: 18 / 30

Signal t erminator re s i s tor s are located on the
backp l n e P C B , and a r e s hown schematically in
figure - 7.
An ad itio n a l conn ec tor , J5A, is installed on the
backp l n e to acco mmodat e s e v eral status signal s and
auxilia y R AM ref r es h po we r .
This p wer s uppl y p rov id es regulated DC voltages
(+12, 12, + 5,
&
-5) from 100,115,215 or 230 VAC
power o ur ces. Outpu t le ve ls are delivered through
keyed o nn ec tor s which m a te directly to the front
panel n d bac kpl a n e. A ll outputs have current
limitin a nd ove r v olt age pr o t e ction. These tolerances
are listed in the Spe c i f i cations section of the
iS B C 635
Hardware Referenc e M a nual.
3-8. POWER FAIL STATUS . The power supply
is equipped with a n AC line monitor which will
generate AC LOW s i gna l , w h en the source falls
below 900 7 0of it s nomin a l val u e . The AC LOW signal
i s wired to pin 19 on J5 A of t h e backplane. Pin 19 is
typicall y connected t o an in t e r rupt matrix o r con-
troller on the Single Boa rd Co m p u ter .
3-9. OUTPUT VOLTAGE A DJUST MENTS.
Each output voltage lev el is i n dividually adjustable.
Procedures for the se adjus tm ents are given in
Chapter 3 of the
iSB C
635
Hardware Reference
Manual.