Altera Arria GX Development Board - Manual (Page 40)

2–30 Reference Manual Altera Corporation
Arria GX Development Board October 2007
Temperature Sensor
Switching between power being delivered by the PCIe slot or through the
AC adapter is managed using the LTC4416 multiplexer. A similar
multiplexer is used to select 12 V power for the HSMC being supplied by
the PC or an AC adapter.
Figure 2–10 shows the configuration for this
power multiplexer.
Figure 2–10. Configuration for the Power Multiplexer
Temperature
Sensor This board has a two-wire SMBus interface to a National Semiconductor
temperature sensing device (LM95235), which is a low-bandwidth A/D
converter that measures small voltage changes across a temperature
diode on the die of the Arria GX device. The device can be programmed
to automatically turn on a cooling fan at a specified temperature. A
stuffing resistor is available to turn the fan on regardless of the LM95235
setting.
Table 2–26 describes the National Semiconductor device.








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Table 2–26. Arria GX Thermal Solutions Parts List
Board Reference Description Manufacturer
Manufacturer Part
Number
Manufacturer
Web Site
U13 Remote diode
temperature sensor National
Semiconductor LPM95235 www.national.com