Publication No. SBC329-HRM/1
Installation and Power Up/Reset 25
4 •
Installation and Power Up/Reset
in section 1 before installing the SBC329.
The following notices also apply:
CAUTION
Consult the enclosure documentation to ensure that the SBC329
’s power requirements are
compatible with those supplied by the backplane.
4.1 Power Supply Requirements
The SBC329 requires the backplane to provide 12V (VS1)
1
, 3.3V (VS2), 5V (VS3) and
3V3_AUX supplies. Approximate supply requirements are as follows:
Table 4-1 Power Supply Requirements
Supply
Current Requirement VPX Specification Limits
VS1(xxxxxx1xx variant)
Up to 6.9 A
12V ±5 %
VS2
Up to 1.0 A
+3.3V +0.15V -0.05V
VS3 (xxxxxx1xx variant)
Up to 0.6 A
+5V +5% -2.5%
VS3 (xxxxxx2xx variant)
Up to 14.9 A
+5V +5% -2.5%
P3V3_AUX
Up to 0.4 A
+3.3V ±5 %
NOTE
The above table shows requirements for the SBC329 without an XMC fitted. XMCs can draw
power from both VS2 and VS3 so this should be factored in when determining system level
specifications.
P12V_AUX and N12V_AUX are not required for board operation, but are routed to
the auxiliary supplies of the XMC site.
The VBAT supply may be used to power the Real-Time Clock in isolation when the
board is powered down, to maintain the time/date information. This requires up to
20 µA at 3.0 V ± 0.5 V.
4.1.1
Power Supply Sequencing
The backplane supply rails can be powered up in any order, although the 12V rail (if
used) must be stable no later than 200ms after all other rails are stable.
1
The SBC329-xxxxxx2xx variant only does not require VPX Vs1 to be available.