AN 944: Thermal Modeling for Agilex™ 7 FPGAs with the Intel® FPGA Power and Thermal Calculator

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ID 683810
Date 11/07/2024
Public
Document Table of Contents
Document Table of Contents x
1. List of Abbreviations 2. Introduction 3. Agilex™ 7 FPGA Package Mechanical Design 4. Agilex™ 7 FPGA Thermal Design Parameters 5. Thermal Design Process for Agilex™ 7 Devices 6. Power and Thermal Calculator (PTC) for Agilex™ 7 Devices 7. Example 2—Alternative Method of Analyzing Thermal Design 8. Document Revision History for AN 944: Thermal Modeling for Agilex™ 7 FPGAs with the Intel® FPGA Power and Thermal Calculator
3. Agilex™ 7 FPGA Package Mechanical Design x
3.1. Agilex™ 7 Physical Package Structure
4. Agilex™ 7 FPGA Thermal Design Parameters x
4.1. Agilex™ 7 Compact Thermal Model (CTM) 4.2. Agilex™ 7 Temperature Sensing 4.3. Thermal Sensor Accuracy
5. Thermal Design Process for Agilex™ 7 Devices x
5.1. Thermal Parameter Dependencies and Accuracy
6. Power and Thermal Calculator (PTC) for Agilex™ 7 Devices x
6.1. Device Selection and Analysis Example 6.2. Logic Design Information 6.3. Thermal Page and Thermal Design Parameters 6.4. CTM Model 6.5. Heat Sink 6.6. CFD Model
7. Example 2—Alternative Method of Analyzing Thermal Design x
7.1. Example 2—Full Length 1 Slot PCIe with 2 FPGAs 7.2. Thermal Design Optimization
1. List of Abbreviations
2. Introduction
3. Agilex™ 7 FPGA Package Mechanical Design
4. Agilex™ 7 FPGA Thermal Design Parameters
5. Thermal Design Process for Agilex™ 7 Devices
6. Power and Thermal Calculator (PTC) for Agilex™ 7 Devices
7. Example 2—Alternative Method of Analyzing Thermal Design
8. Document Revision History for AN 944: Thermal Modeling for Agilex™ 7 FPGAs with the Intel® FPGA Power and Thermal Calculator

4.3. Thermal Sensor Accuracy

Both digital thermal sensors (DTSs) and thermal sensor diodes (TSDs) have a sensor accuracy of ±5°C. This margin of error means that a reported value of 100°C could actually be as high as 105°C, which might adversely affect the reliability and timing closure of the FPGA. Therefore, you should design for a cooling margin of at least 5°C, to ensure that the resulting cooling solution remains within the margin of error of the sensors, and does not exceed the desired maximum junction temperature.

When using TSDs you must calibrate the external device to your design circuitry. Reported temperatures from the external temperature sensors can be incorrect by 10°C or more, depending on which die temperature is measured. For further detail on the bonded sensors and how to read them, refer to AN 769: Intel FPGA Remote Temperature Sensing Diode Implementation Guide.

Level Two Title