MSP430F5324: MSP430F5324

Hi Joyce,

MSP430 keep low PPM and high reliable.

I find you encounter high fail rate issue about F5324, could you share more details about your project?

Like power supply, code, sch...

I think maybe others reason result in so high fail rate.

Thanks!

Best Regards

Johnson

Hi Johnson, 

Thanks for the reply. We did not do any design change since 2020. Everything is working fine until the current batch of MCU.

Below is the MSP circuit, it communicates with CC1101 via SPI.

Application power supply: 3V.

Programming tool: MSP-EXP430G2 3.5V

Hi Joyce,

I think such a high failure rate is abnormal, you can check whether the MSP-EXP430G2 you are used now if normal or whether the download cable is too long.
However, if there is still a problem after the normal download procedure, you can contact your FAE for failure analysis.

Thanks!

Best Regards

Johnson

Dear Johnson,

I am Dong, Test engineer in CEI Vietnam.

This is a project run by my company, I have shared detail with you

1) The waveform of pin 6 of MSP430F5324IRGCR. 
a) Unit good:

This is waveform signal pin 6 of ic MSP430F5324IRGCR

b) Unit failure mode 1: 

The PCBA don't have signal output (pin 6), this is Mode 1: @joyce wang mention

c) Unit failure mode 2:

The PCBA have signal output  (pin 6) but failuer function test. This is mode failuer @joyce wang mention in top topic

2) Swap (unit good, unit failure)

We already swap 4 MCU MSP430F5328 from GOOD and BAD.

After swap, LED on Good unit off after programing become fail. LED on Bad unit become light up and blinking become pass

3) Raw IC Screening Test Setup

Programming tools: Launchpad MSP430G2XX Evaluation Board

MPN: MSP-EXP430G2

Software: FET-Pro-430-LITE.exe 

We removed the MCU from a working (known good) DUT.

Soldered all key connections directly to the QFN64 test socket.

DUT was connected to Launchpad MSP430G2XX Evaluation Board.

Video 1 (MCU Passed) and Video 2 (MCU Passed)

 Video 1 and Video 2 showing raw part IC was loaded into the test socket, a laptop running programming software “Lite FET-Pro430.exe”.

 At the end of the video (after programming passed), you can see the green LED on DUT blink twice (reset), after about 3-4 seconds, LED light up permanently.

This is a normal behavior of a known good DUT

Video 3 (MCU Failed Mode 1) 

Video 3 showing raw part IC was loaded into the test socket, a laptop running programming software “Lite FET-Pro430.exe”. 

At the end of the video (after programming passed), you can see the green LED is totally dead. 

This is known as failure mode 1. 

Video 4 (MCU Failed Mode 2) 

Video 4 showing raw part IC was loaded into the test socket, a laptop running programming software “Lite FET-Pro430.exe”. 

At the end of the video (after programming passed), you can see the green LED on DUT blink twice (reset) and light up for a few seconds and the DUT reset again.

This is known as failure mode 2.

Raw IC Failure Rate: 

So far, we have tested 40 pcs raw part IC.

Following is the test result: 

 Failure rate based on 40 pcs = 35%.

Please the video link

https://drive.google.com/drive/folders/1WCHtLRuZmdFSshT4JkDO48X5q1Wl-NzA

4) All 2,900pcs failed are from one DATE CODE/LOT : 2236/LOT:2192875UT2

5) Use DMM check GND with all PINs in the IC. 

the IC good and IC bad the same value.

Thank you so much!

Best Regards

Tuan Dong