EKF SC3-LARGO - Hardware Monitor LM87

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User Guide • SC3-LARGO • CompactPCI

Serial CPU Board • Intel

Core

5xxx Processor

Hardware Monitor LM87

Attached to the SMBus, the SC3-LARGO is provided with a hardware monitor (LM87). This device is

capable to observe the board and on-board memory temperatures, as well as several supply voltage

rails with a resolution of 8 bit. The following table shows the mapping of the voltage inputs of the

LM87 to the corresponding supply voltages of the SC3-LARGO:

Input Source Resolution Register

AIN1 Processor Core Voltage 9.8mV 0x28

AIN2 +1.5V 9.8mV 0x29

VCCP1 +1.35V 14.1mV 0x21

VCCP2/D2- +1.8V 14.1mV 0x25

+2.5V/D2+ +1.05V 13mV 0x20

+3.3V +3.3V 17.2mV 0x22

+5V +5V 26mV 0x23

+12V +12V 62.5mV 0x24

D1+/D1- Memory Down absolute

Temperature

1°C 0x26

Local TEMP SC3 Surface Temperature 1°C 0x27

Beside the continuous measuring of temperatures and voltages the LM87 may compare these values

against programmable upper and lower boundaries. As soon as a measurement violates the allowed

value range, the LM87 can request an interrupt via the GPI13 input of the QM87 PCH (which may

result in a system management interrupt).