ep1agx50d Altera Corporation, ep1agx50d Datasheet - Page 150

• Manufacturer Part Number: ep1agx50d
• Description: Arria Gx Device Data Sheet
• Manufacturer: Altera Corporation

Configuration and Testing
Temperature
Sensing Diode
3–10
Arria GX Device Handbook, Volume 1
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.
For more information about Arria GX PLLs, refer to the
Devices
Arria 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 such as a MAX1617A or MAX1619
from MAXIM Integrated Products. These devices steer bias current
through the Arria GX diode, measuring forward voltage and converting
this reading to temperature in the form of an eight-bit signed number
(seven bits plus one sign bit). The external device’s output represents the
junction temperature of the Arria GX device and can be used for
intelligent power management.
The diode requires two pins (tempdiodep and tempdioden) on the
Arria GX device to connect to the external temperature-sensing device, as
shown in
and therefore can be used before the Arria GX device is powered.
Figure 3–1. External Temperature-Sensing Diode
Arria GX Device
chapter in volume 2 of the Arria GX Device Handbook.
Figure
3–1. The temperature sensing diode is a passive element
tempdiodep
tempdioden
Temperature-Sensing
Device
Altera Corporation
PLLs in Arria GX
May 2008