Lenovo PC 300PL Technical Information Manual 6275, 6285 - Page 43

IBM PC System Monitor LM80, System Management Chip, System Management Bus SMBus Controller

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Chapter 6. IBM System Management Tools IBM PC System Monitor (LM80) This application monitors system-board temperatures, system voltages, and fan speed, and detects removal of the computer cover. Data is reported to the DMI service provider. System management software, such as IBM NetFinity Services or Intel LANDesk Client Manager, can then be used to send an alert to the user or to the system administrator if a problem occurs. The IBM PC System Monitor must be installed in addition to NetFinity in order to enable environmental monitoring in NetFinity (PC System Monitor and NetFinity can be installed in either order). System Management Chip The PC300PL contains a National System Management chip (LM80) that provides low cost instrumentation capabilities for a PC in order to lower the total cost of ownership over the life cycle of the PC. The System management chip monitors the system at all times looking for potential failures before the system fails. Notification can be provided across the LAN. System Management controller monitors the following: System temperature sensing and fan control Voltages (+5,+12,-12,+3.3,+1.5,2.5, and -5) Intrusion detect for security (detects when chassis lid has been removed, even if power is off). Uses mechanical switch in the speaker/fan assembly. Serial Bus interfaces (SMBus version) These hardware functions allow the LCM, LCCM, and LDCM Network software to remotely monitor the client PCs over the network for these critical parameters. When machines are found with out-of-range parameters, appropriate repair, backup, and shutdown actions may be taken. The LM80 physically resides on the SMbus interface. The device address for the LM80 is 0x50 hex . The SMBus protocol is used to read/write data to/from ALL registers onboard the LM80. There is a protocol established for reading and writing these registers to maintain consistency in the eventuality that the thread is broken (context switch) while servicing it. Each of these registers and their functionality is spelled out in the Software Interface section of this document. LM80 contains virtually all the signal conditioning and front end analog circuitry necessary to interface to the power supply voltages, fan and chassis intrusion alarm onboard as well as having a fully self contained temperature sensor. An SMbus (Integrated Circuit, 2 wire serial) slave bus interface is also provided for future compatibility with other SMbus devices. At initial power on configuration, the LM80 will be programmed with predetermined threshold values for temperature, voltage, and fan control. During system operation IBM PC System Monitor code polls the LM80 and generates an alert when the measured value is outside of the programmed min and max range. System Management Bus (SMBus) Controller PIIX4E contains a SMBus Host interface to allow the CPU to communicate with SMBus slaves. The PIIX4E also provides an SMBus slave interface to allow external masters to monitor power management events. The SMBus controller is logically a subset of the PIIX4E power management controller. Chapter 6. IBM System Management Tools 31

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Chapter 6.
IBM System Management Tools
IBM PC System Monitor (LM80)
This application monitors system-board temperatures, system voltages, and fan speed, and detects
removal of the computer cover.
Data is reported to the DMI service provider.
System management
software, such as IBM NetFinity Services or Intel LANDesk Client Manager, can then be used to send an
alert to the user or to the system administrator if a problem occurs.
The IBM PC System Monitor must be
installed in addition to NetFinity in order to enable environmental monitoring in NetFinity (PC System
Monitor and NetFinity can be installed in either order).
System Management Chip
The PC300PL contains a National System Management chip (LM80) that provides low cost
instrumentation capabilities for a PC in order to lower the total cost of ownership over the life cycle of the
PC.
The System management chip monitors the system at all times looking for potential failures before
the system fails.
Notification can be provided across the LAN.
System Management controller monitors the following:
System temperature sensing and fan control
Voltages
(+5,+12,-12,+3.3,+1.5,2.5, and -5)
Intrusion detect for security (detects when chassis lid has been removed, even if power is off). Uses
mechanical switch in the speaker/fan assembly.
Serial Bus interfaces (SMBus version)
These hardware functions allow the LCM, LCCM, and LDCM Network software to remotely monitor the
client PCs over the network for these critical parameters. When machines are found with out-of-range
parameters, appropriate repair, backup, and shutdown actions may be taken.
The LM80 physically resides on the SMbus interface.
The device address for the LM80 is 0x50 hex .
The SMBus protocol is used to read/write data to/from ALL registers onboard the LM80.
There is a
protocol established for reading and writing these registers to maintain consistency in the eventuality that
the thread is broken (context switch) while servicing it.
Each of these registers and their functionality is
spelled out in the Software Interface section of this document.
LM80 contains virtually all the signal conditioning and front end analog circuitry necessary to interface to
the power supply voltages, fan and chassis intrusion alarm onboard as well as having a fully self
contained temperature sensor.
An SMbus (Integrated Circuit, 2 wire serial) slave bus interface is also
provided for future compatibility with other SMbus devices.
At initial power on configuration, the LM80 will be programmed with predetermined threshold values for
temperature, voltage, and fan control.
During system operation IBM PC System Monitor code polls the
LM80 and generates an alert when the measured value is outside of the programmed min and max range.
System Management Bus (SMBus) Controller
PIIX4E contains a SMBus Host interface to allow the CPU to communicate with SMBus slaves.
The
PIIX4E also provides an SMBus slave interface to allow external masters to monitor power management
events.
The SMBus controller is logically a subset of the PIIX4E power management controller.
Chapter 6.
IBM System Management Tools
31