SC9-TOCCATA • CompactPCI® Serial CPU Board • 11th Generation Intel® Processors
Hardware Monitor NCT7491
Attached to the SMBus, the SC9-TOCCATA 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 SC9-TOCCATA:
Input
Source
Resolution
Register
(MSB/LSB)
VCCP
Processor Core Voltage
2.93mV
0x21/0x76[3:2]
VTT
Processor Sustain Voltage (+1.05V)
2.20mV
0x1E/0x1F[5:4]
+2.5V/THERM#
+1.2V
3.26mV
0x20/0x76[1:0]
VCC
+3.3V
4.29mV
0x22/0x76[5:4]
+5Vin
Coin Cell Voltage (V
CCRTC
)
6.54mV
0x23/0x76[7:6]
+12Vin
+12V
15.92mV
0x24/0x77[1:0]
PECI
Core #0 absolute Temperature
1°C
0x04
PECI
Core #1 absolute Temperature
1°C
0x05
PECI
Core #2 absolute Temperature
1°C
0x06
PECI
Core #3 absolute Temperature
1°C
0x07
D1+/D1-
Memory Down absolute
Temperature
0.25°C
0x25/0x77[3:2]
Local TEMP
SC9 Surface Temperature
0.25°C
0x26/0x77[5:4]
Besides 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_D11 input
of the RM590E PCH or an interrupt via the GPP_D12 input (which may result in a system
management interrupt).
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