User Guide • SC4-CONCERTO • CompactPCI
®
Serial CPU Board
Hardware Monitor NCT7491
Attached to the SMBus, the SC4-CONCERTO is provided with the hardware monitor NCT7491. This
device is capable to observe the temperatures of the board, processor cores, and on-board memory,
as well as several supply voltage rails with a resolution of 10 bit. The following table shows the
mapping of the voltage inputs of the NCT7491 to the corresponding supply voltages of the
SC4-CONCERTO:
Input
Source
Resolution
[mV]
Register
VCCP
Processor Core Voltage
2.93
0x21/0x76
VTT
+1.0V
2.20
0x1E/0x1F
+2.5V/THERM#
+1.2V
3.26
0x20/0x76
VCC
+3.3V
4.29
0x22/0x76
+5Vin
+5V
6.54
0x23/0x76
+12Vin
+12V
15.92
0x24/0x77
Beside the continuous measuring of temperatures and voltages the NCT7491 may compare these
values against programmable upper and lower boundaries. As soon as a measurement violates the
allowed value range, the NCT7491 can request an over-temperature event on GPP_D1 input of the
CM238 or an interrupt via the GPP_D2 input (which may result in a system management interrupt).
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