Xerox 4540 Service Manual - Page 251

I2E Bus Devices, F.1 Power-On Reset Sequence, F.2 I2E Bus Address Table

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F A P P E N D I X I2E Bus Devices This appendix describes the I2E bus devices. F.1 Power-On Reset Sequence The Inter-IC Communication bus (I2C) is a simple 2-pin serial bus used to control some of the basic chassis management features. These include existing EEPROMs, fan controllers, and power supply monitors that are used to monitor the health and status of the chassis. In some instances, such as temperature, a separate interrupt immediately alerts the processors when it detects a problem. F.2 I2E Bus Address Table TABLE F-1 shows the addresses of the devices on the bus. TABLE F-1 I2E Bus Addresses Description Part # Fan controller 0 VSC055-01 Fan controller 1 VSC055-01 System monitor ADM1026 Processor inlet temp LM75 sensor PCI card area temp LM75 sensor Location Disk backplane Disk backplane Front of I/O controller Rear of CPU board Address (Hex) 0x1000000 (40/80) 0x1000001 (41/82) 0x0101100 (2C/58) 0x1001001 (49/92) Between PCI slots on I/O 0x1001010 (4A/94) controller F-1

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F-1
APPENDIX
F
I
2
E Bus Devices
This appendix describes the I
2
E bus devices.
F.1
Power-On Reset Sequence
The Inter-IC Communication bus (I2C) is a simple 2-pin serial bus used to control
some of the basic chassis management features. These include existing EEPROMs, fan
controllers, and power supply monitors that are used to monitor the health and
status of the chassis. In some instances, such as temperature, a separate interrupt
immediately alerts the processors when it detects a problem.
F.2
I
2
EBus Address Table
TABLE F-1
shows the addresses of the devices on the bus.
TABLE F-1
I
2
E Bus Addresses
Description
Part #
Location
Address (Hex)
Fan controller 0
VSC055-01
Disk backplane
0x1000000 (40/80)
Fan controller 1
VSC055-01
Disk backplane
0x1000001 (41/82)
System monitor
ADM1026
Front of I/O controller
0x0101100 (2C/58)
Processor inlet temp
sensor
LM75
Rear of CPU board
0x1001001 (49/92)
PCI card area temp
sensor
LM75
Between PCI slots on I/O
controller
0x1001010 (4A/94)