Published On: March, 1, 2018 By: Eshtaartha Basu | Updated: July 18, 2018 by Cathleen Wicks
The temperature of a device during operation in a system is an important parameter as it affects many properties such as device functionality, reliability and life. Since OSD335x-SM is a System-In-Package (SiP) with several ICs and passive components, single IC package data cannot be used to estimate its thermal characteristics. Hence, it was necessary to characterize OSD335x-SM SiP for its thermal behavior.
This document will provide thermal characteristics of OSD335x-SM and a way to estimate junction temperature. We will also give a comparison of OSD335x-SM with a similar system of discrete components.
1. Comparison of OSD335x-SM with Discrete Components
2. OSD335x-SM Thermal Parameters
3. Measuring Case Temperature and Estimating Junction Temperature of the OSD335x-SM SiP
A PDF version of this App Note can be found here.
One of the questions we seek to know is how SiP temperatures compare with a similar system that has individual components in it.
Figure 1 shows case temperature of AM3358 at approximately 99% CPU Load on a board that had individual components mounted and Figure 2 shows case temperature of OSD335x-SM (focused on AM3358 die) under same load. We can see that OSD335x-SM case temperature is less (approximately 51.3°C ) compared to that of AM3358 for the same load (approximately 54.8°C).
The measured Thermal Parameters of OSD335x-SM are given in Table 1.
(1) Â is the measured Thermal Resistance from Junction to Top of Package as measured above the CPU when the SiP is mounted on a 4 layer board (OSD3358-SM-RED platform) in still air and CPU under maximum load, and other components operating per spec.
(2) Â is the measured Thermal Resistance from Junction to Ambient Air when the SiP is mounted on a 4 layer board (OSD3358-SM-RED platform) in still air and CPU under maximum load, and other components operating per spec.
To measure the case temperature of OSD335x-SM SiP:
It may be desirable to estimate the Junction Temperature (TJ) of the AM3358 Die inside the System-in-Package. In this case it can be estimated with the following equation:
The OSD335x-BAS Thermal Guide can be found HERE
For more information , please connect directly to our engineers on the forums at www.octavosystems.com/forums
Â
Octavo Systems LLC all rights reserved
OCTAVO is registered in the U.S. Patent and Trademark Office. OSD, C-SiP, and the Octavo Logo are trademarks of Octavo Systems LLC.
"*" indicates required fields
"*" indicates required fields
"*" indicates required fields
"*" indicates required fields