EKF CompactPCI SC5-FESTIVAL, Руководство пользователя

Страница: 63 / 102

User Guide • SC5-FESTIVAL • CompactPCI
®
Serial CPU Board
Hardware Monitor NCT7491
Attached to the SMBus, the SC5-FESTIVAL 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
SC5-FESTIVAL:
Input Source Resolution Register
(MSB/LSB)
VCCP Processor Core Voltage 2.93mV 0x21/0x76[3:2]
VTT +1.0V 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 +5V 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 SC5 Surface Temperature 0.25°C 0x26/0x77[5:4]
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).
© EKF -63- ekf.com