EP2SGX60CF780C4N Datasheet, PDF (166/316 Pages) Altera Corporation – Support for numerous single-ended and differential I/O standards

Temperature Sensing Diode (TSD)
f
considerable flexibility for frequency synthesis, allowing real-time
variation of the PLL frequency and delay. The rest of the device is
functional while reconfiguring the PLL.
See the PLLs in Stratix II & Stratix II GX Devices chapter in volume 2 of
the Stratix II GX Device Handbook for more information on Stratix II GX
PLLs.
Temperature
Sensing Diode
(TSD)
Stratix II GX devices include a diode-connected transistor for use as a
temperature sensor in power management. This diode is used with an
external digital thermometer device. These devices steer bias current
through the Stratix II GX diode, measuring forward voltage and
converting this reading to temperature in the form of an 8-bit signed
number (7 bits plus 1 sign bit). The external device’s output represents the
junction temperature of the Stratix II GX device and can be used for
intelligent power management.
The diode requires two pins (tempdiodep and tempdioden) on the
Stratix II GX device to connect to the external temperature-sensing
device, as shown in Figure 3–1. The temperature sensing diode is a
passive element and therefore can be used before the Stratix II GX device
is powered.
Figure 3–1. External Temperature-Sensing Diode
Stratix II GX Device
Temperature-Sensing
Device
tempdiodep
tempdioden
3–10
Stratix II GX Device Handbook, Volume 1
Altera Corporation
October 2007