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AT8901
The management (or suspend) power is present once the board is connected to the backplane.
It supplies the IPMI part which in turn controls the payload power. The various payload voltages
are sequenced. The initial power up sequence is as follows (20ms delay between steps):
1. 3.3V, 1.8V and fabric mezzanine
2. 2.5V, 1.25V and 1.2V
The Power Down Sequence is performed in reversed order with a 1ms delay.
3.7.3
Power Supply AMCs
Each AMC has its own power supply. The 12V payload power is generated by a hot swap con-
troller and for the 3V3 management power a current limit switch is used. The maximum power
dissipation for an AMC is 60W. Both AMCs together must not consume more than 75W.
For further details please refer the AMC Specification.
3.7.4
Power Supply RTM
The RTM has its own power supply. The 12V payload power is generated by a hot swap con-
troller and for the management power a current limit switch is used. The maximum power dis-
sipation for an RTM is 10W.
For further details please refer the PICMG 3.0 standard.
3.7.5
Power Transients
The board provides continuous operation in the presence of transients shown in the following
table of the PICMG 3.0 standard:
Table 3-15: Power Transients
Voltage
Duration
- 200 Volts
5 µs
- 100 Volts
10 µs
- 75 Volts
10 ms
- 0 Volts
5 ms
In case of a 0V transient the board is able to keep the board alive for 8ms. The necessary en-
ergy is buffered in a capacitor. The load time for the capacitor is 100s.
Comments
- 100 to - 200 Volts
- 75 to - 100 Volts
10 Volts per ms-Rise or Fall
50 Volts per ms-Fall
12.5 Volts per ms-Rise
Assumes prior voltage is above -44
VDC for Shelves, -43 VDC for
Boards
Page 3 - 16
Hardware Description
Protected by
Frame or Shelf
Board
Board
Board
AT8901 User Guide
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