Kontron AT8404 - Manual (Page 47)

Hardware Description
34 AT8404 User Guide
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3.1.9.5 Power Supply RTM
The RTM has its own power supply. The 12V payload power is generated by a hot swap controller and for the
management power a current limit switch is used. The maximum power dissipation for an RTM is 10W.
For further details please refer the PICMG 3.0 standard.
3.1.9.6 Power Transients
The board provides continuous operation in the presence of transients shown in the following table of the PIC-
MG 3.0 standard:
In case of a 0V transient the board is able to keep the board alive for 5ms. The necessary energy is buffered in
a capacitor.
3.1.9.7 Optional Chassis to Logic Ground Connection
According to NEBS requirement R9-14 of GR-1089-CORE issue 3, the AT8404 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 J7 and is labelled "GND TO CHASSIS".
3.1.10 Jumpers
Eight jumpers in the upper right corner allow debug settings (J7). The IPMI and AMC E-Keying override jump-
ers enable bypassing communication with the ShMC for bench operation. The JTAG jumpers configure the
boundary scan path. JTAG operation requires the use of the RTM8030.
Table 3-17: Power Transients
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
WARNING
Operation with any of these jumpers set is not supported by the stan-
dard application software.