Instruction Manual

AT8901M Hardware Description
Page 3 - 16 AT8901M User Guide
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
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.
3.7.6 Optional Chassis to Logic Ground Connection
According to NEBS requirement R9-14 of GR-1089-CORE issue 3, the AT8901M provides a
connection between chassis and logic ground. It is made up of a screw that connects the PCB
to the bottom sheet.
If chassis and logic ground shall be isolated, the screw with its washer can be removed. It is
located near the jumper header J11 and is labelled "GND TO CHASSIS".
Voltage Duration Comments Protected by
- 200 Volts 5 µs - 100 to - 200 Volts Frame or Shelf
- 100 Volts 10 µs - 75 to - 100 Volts Board
- 75 Volts 10 ms 10 Volts per ms-Rise or Fall Board
- 0 Volts 5 ms 50 Volts per ms-Fall
12.5 Volts per ms-Rise
Assumes prior voltage is above -44
VDC for Shelves, -43 VDC for
Boards
Board