166
Chapter 7 Power System
Power Good Circuit
The power good circuit looks at the levels of the power good (PGOOD)
signals. When the backplane PGOOD circuit senses a PGOOD signal, a
system PGOOD is asserted after an approximately 550 ms delay. Only a
single PGOOD signal assertion will cause the assertion of the system
PGOOD.
VA Monitor Circuit
The total supply current that forms part of the load sharing circuit monitors
+3.3 V as well as +5 V and +12 V on the system board. The microcontroller
determines the current supplied to the system board by subtracting the
peripheral current from the total current.
If either the system board power or peripheral power exceeds 240 VA, the
backplane microcontroller disables the supply outputs by disasserting PON.
The following table shows the maximum available current to each of the
system connections. Resetting the circuit requires unplugging all of the
power supplies.
Connectors
+5 V
+12 V
J1
44 A (+4 A)
16 A (+4 A)
J5
44 A (+4 A)
16 A (+4 A)
The maximum current number shown is the sum of the currents from all
supplies.
I²C Communication Circuit
The power share backplane microcontroller communicates with a similar
device on the system board through an I
2
C data link. This link reports the
number of power supplies in the server, current and power to the system
board and peripherals, and power supply status. The I
2
C signals are routed
through J2 to the system board.
Summary of Contents for MB440LX
Page 1: ...Intel MB440LX System Installation Guide...
Page 6: ...1 6 Your Chapter Title Goes Here...
Page 16: ...16 Contents...
Page 26: ...26 Chapter 1 Server Description OM05793 Figure 1 4 Security Padlocks...
Page 48: ...48 Chapter 2 Installing The System...
Page 78: ...78 Chapter 3 Configuring The System...
Page 114: ...114 Chapter 4 Working Inside Your System OM05791A 1 2 3 Figure 4 19 Lithium Back up Battery...
Page 116: ...116 Chapter 4 Working Inside Your System OM05268 Figure 4 20 Removing the Front Panel Board...
Page 118: ...118 Chapter 4 Working Inside Your System OM05278 Figure 4 21 Front Panel Fans...
Page 127: ...M440LX Server System Product Guide 127 OM05771 Figure 4 26 Removing the Power Share Backplane...
Page 132: ...132 Chapter 4 Working Inside Your System...
Page 137: ...M440FX Server System Product Guide 137 OM06470 1 2 Figure 5 2 Installing a Hard Disk Drive...
Page 200: ...200 Chapter 9 I O Ports and Connectors...
Page 224: ...224 Chapter 10 Solving Problems...