BajaPPC-750 Setup
2-15
2.3.1 Providing Power
Be sure your power supply is sufficient for the board. Without a PMC module, the
BajaPPC-750 requires about 30 watts maximum. With two PMC modules, the
requirement is approximately 45 watts maximum. Power supply ripple and noise
below 10 MHz should be limited to 50 mV peak-to-peak (a requirement of the
VMEbus specification). Power requirements for the BajaPPC-750 are shown in
Table 2-3.
NOTE.
VMEbus connectors P1 and P2 must be used to meet BajaPPC-750’s
power requirements. Fuses select whether the P1 connector or the on-
board regulator pr3.3-volt power signals for the PMC mod-
ule(s). Both power sources have a current limit of 1 Amp (see also
Chapter 5).
2.3.2 Providing Air Flow
As with any printed circuit board, be sure that there is sufficient air flow to the
board to prevent overheating. The environmental requirements are specified as:
Operating temp.
0 to +55 degrees Centigrade, ambient (at board)
Relative humidity
0% to 95% (non-condensing)
Storage temperature
–40 to +85 degrees Centigrade, ambient
CAUTION.
High operating temperatures will cause unpredictable opera-
tion or permanent failure. Because of the high power require-
ments of the CPU, fan cooling is required for all
configurations, even when boards are placed on extenders.
Table 2-3. Power Requirements
Voltage
(volts)
Range
(volts)
Maximum
Current
Usage
+3.3
±5%
1 amp
a
a. Many modules do not require the +3.3V supply.
PMC module dependent
+5
±5%
4 amps
b
b. Current is measured during an on-card memory test, without a PMC module.
All logic
+12
±5%
100 milliamps
c
c. Estimated
PMC module dependent
-12
±5%
100 milliamps
c
PMC module dependent
Содержание BajaPPC-750
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Страница 4: ...BajaPPC 750 PowerPC Based Single Board Computer User s Manual May 2002...
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Страница 16: ...0002M621 15 ix Register Map 9 1 Counter Timer Status CTSR 9 2 Register Map 9 2 Counter Timer Mode CTMR 9 4...
Страница 19: ...xii BajaPPC 750 Contents...
Страница 57: ...3 12 BajaPPC 750 Central Processing Unit May 2002...
Страница 77: ...5 12 BajaPPC 750 PMC PCI Interface May 2002...
Страница 111: ...6 34 BajaPPC 750 VMEbus Interface May 2002...
Страница 135: ...8 18 BajaPPC 750 Serial and Parallel I O May 2002...
Страница 207: ...10 68 BajaPPC 750 Monitor May 2002...