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PSoC 5, 3 & 1

alor_2684976
New Contributor

Hello everybody, I'm new to this community.

In our company we are using the CY8C5467AXI-LP108 processor to control the pendant of our cnc machines. It manages an LCD, a keyboard, 4 status leds and Modbus RTU communication.

The design, layout and the components of the pendant's board have been the same for the last 5 years, and about 200 of these pendants have been produced. Recently we started to have some issues with the latest produced. In particular in 4 pendants the inputs from keyboard stopped working periodically (5-6 times a day) and only a power cycle of the board seemed to solve the problem. Then we discovered that when this happens the processor is very hot at touch, I think about 60-70°C, when normally it is at 30°C. The strange thing is that after power cycling the pendants they starts to work correctly and the temperature of the chip decreases to normal until after some hours it rapidly becomes hot again and manifest function issues. No other components of the board are hot apart of the processor.

We already checked the boards for missing components, wrong resistances etc, but they are ok (they are pre-assembled by our supplier). Also the issue is sporadic and happens when the pendant is not in use but powered.

Could it be a chip issue?

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1 Solution
DheerajK_81
Moderator
Moderator

Please refer to the thermal considerations in section 3.6 page#7 for steps to prevent overheating here: http://www.cypress.com/file/44581/download

Please make sure you have designed your board according to the design guidelines. You can find more information about this under "Thermal Considerations" in Page#2 of the following document: http://www.cypress.com/file/140006/download

Regards,

Dheeraj

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DheerajK_81
Moderator
Moderator

Please refer to the thermal considerations in section 3.6 page#7 for steps to prevent overheating here: http://www.cypress.com/file/44581/download

Please make sure you have designed your board according to the design guidelines. You can find more information about this under "Thermal Considerations" in Page#2 of the following document: http://www.cypress.com/file/140006/download

Regards,

Dheeraj

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alorc_1168841
New Contributor

Thank you Dherraj for your considerations. This project is eight years old and we have done some minor changes about 5 years ago in the schematic. We never had thermal issues but I will take some time to evaluate the documents you have highlighted.