11-4
External Temperature Sensing Diode
SV51013
2013.05.06
Related Information
Provides more information about using the ALTTEMP_SENSE megafunction.
Provides more information about the Stratix V internal TSD specification.
External Temperature Sensing Diode
The Stratix V external TSD requires two pins for voltage reference. The following figure shows how to
connect the external TSD with an external temperature sensor device, allowing external sensing of the
Stratix V die temperature. For example, you can connect external temperature sensing devices, such as
MAX1619, MAX1617A, MAX6627, and ADT7411 to the two external TSD pins for Stratix V device die
temperature reading.
Figure 11-2: TSD External Pin Connections
External TSD
FPGA
TEMPDIODEP
TEMPDIODEN
External
Temperature
Sensor
The TSD is a very sensitive circuit that can be influenced by noise coupled from other traces on the board
or within the device package itself, depending on your device usage. The interfacing signal from the Stratix V
device to the external temperature sensor is based on millivolts (mV) of difference, as seen at the external
TSD pins. Switching the I/O near the TSD pins can affect the temperature reading. Altera recommends
taking temperature readings during periods of inactivity in the device or use the internal TSD with built-in
ADC circuitry.
The following are board connection guidelines for the TSD external pin connections:
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The maximum trace lengths for the TEMPDIODE P /TEMPDIODE N traces must be less than eight inches.
Route both traces in parallel and place them close to each other with grounded guard tracks on each side.
Altera recommends 10-mils width and space for both traces.
Route traces through a minimum number of vias and crossunders to minimize the thermocouple effects.
Ensure that the number of vias are the same on both traces.
Ensure both traces are approximately the same length.
Avoid coupling with toggling signals (for example, clocks and I/O) by having the GND plane between
the diode traces and the high frequency signals.
For high-frequency noise filtering, place an external capacitor (close to the external chip) between the
TEMPDIODE P /TEMPDIODE N trace. For Maxim devices, use an external capacitor between 2200 pF to
3300 pF.
Place a 0.1 uF bypass capacitor close to the external device.
You can use the internal TSD with built-in ADC circuitry and external TSD at the same time.
If you only use internal ADC circuitry, the external TSD pins (TEMPDIODE P /TEMPDIODE N ) can be
connected to GND because the external TSD pins are not used.
Altera Corporation
Power Management in Stratix V Devices
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