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MSP430F122: MSP430F122 IC U5 malfunction

rita wang
Prodigy 10 points
Part Number: MSP430F122

Tool/software:

FCT test failure , Due to the same adverse phenomenon, J3 voltage is too low, Defective rate: 12%

After analysis and verification, it has been preliminarily confirmed that IC U5 has poor functionality

1. Heating and retesting FCT PASS for PCBA or IC, verifying and testing 5 pieces, but still failing after cooling down
2. IC U5 swap validation with 2 pieces each, pass test fail after swap, fail test pass
3. Re burn IC U5 and test FCT again, but it still fails
4. Replace 5 new IC materials, 4 pass, 1 fail
5. Measure the resistance of IC U5 and ensure that the bias voltage is basically the same

U5 resistance

U5  bias

Pin

Pass

Fail

Pin

Pass

Fail

1

300K

300K

1

0.5

0.5

2

160K

170K

2

0.4

0.4

3

0.5M

0.5M

3

0.5

0.5

4

0

0

4

0

0

5

32M

30M

5

0.5

0.5

6

0

0

6

0

0

7

330K

330K

7

0.5

0.5

8

16M

15M

8

0.5

0.5

9

170K

180K

9

0.5

0.4

10

16M

16M

10

0.6

0.5

11

14M

13.5M

11

0.4

0.4

12

14M

15M

12

0.5

0.5

13

16M

15M

13

0.6

0.6

14

16M

15M

14

0.6

0.5

15

10K

10K

15

0.57

0.57

16

10K

10K

16

0.57

0.57

17

10K

10K

17

0.57

0.57

18

10K

10K

18

0.57

0.57

19

2.8M

2.8M

19

0.6

0.6

20

16M

15.5M

20

0.6

0.6

21

16M

15M

21

0.55

0.55

22

16M

15M

22

0.6

0.6

23

14M

13.5M

23

0.45

0.45

24

170K

180K

24

0.45

0.46

25

16M

15M

25

0.45

0.46

26

16M

15M

26

0.45

0.46

27

16M

15M

27

0.45

0.46

28

14.5M

14M

28

0.45

0.45
  • 0
    TI__Genius 9122 points

    Hi, rita wang

    Can you send me your project information via E2E internal message?

    Need more explain from your side:

    rita wang said:
    FCT test failure , Due to the same adverse phenomenon, J3 voltage is too low, Defective rate: 12%

    Please give me more information about these name: FCT, J3

    rita wang said:
    After analysis and verification, it has been preliminarily confirmed that IC U5 has poor functionality

    What's this U5? U5 on PCB or shcematic?

    rita wang said:
    1. Heating and retesting FCT PASS for PCBA or IC, verifying and testing 5 pieces, but still failing after cooling down

    Used the same PCB? What's the heating method? And what's the temperature profile?

     Have you test this J3 voltage before heating?

    rita wang said:
    3. Re burn IC U5 and test FCT again, but it still fails

    Re-download the firmware to U5?

    rita wang said:
    4. Replace 5 new IC materials, 4 pass, 1 fail

    Are these five pieces also soldered to the PCB?

    rita wang said:
    5. Measure the resistance of IC U5 and ensure that the bias voltage is basically the same

    The table is this part's test result, correct?

    It seems that pass and failed device have the same resistance and bias.

    What's this bias and how does bias test?

    Regards,

    Helic

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