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LM95071: White shadow" issue

kathyliu
Prodigy 10 points
Part Number: LM95071

,LM95071CIMFX/NOPB(CIMF/NOPB)   

我们发现来料的温感IC 来料温度偏大，超过了+/-1 度的标准，请原厂做分析：

Reading data from sensor

Ambient: 24.9 degree.

 

OTP tester

FOG tester

OTP tester

FOG tester

OTP tester

Measure times

1st

2nd

3rd

4th

5th

6th

7

8

9

10

11st

previous Samples

1

25.4

25.1

25.4

25.1

25.3

25.4

25.3

25.5

25.8

25.8

25.8

2

25.3

25.1

25.5

25.5

25.5

25.6

25.5

25.9

25.8

26

26

3

25.3

25.1

 

25.3

25.4

25.5

25.4

25.7

25.8

25.9

25.9

4

25.1

25

 

 

 

 

 

 

 

 

 

Average

25.275

25.075

25.45

25.3

25.4

25.5

25.4

25.7

25.8

25.9

25.9

current NG samples

1

28.1

27.9

28.1

28.1

28.2

28

27.9

28.1

28.3

28.3

28.5

2

28.5

28.2

28.5

28.5

28.4

28.5

28.3

28.6

28.9

28.8

28.9

3

28

27.7

 

28.3

28.3

28.25

28.1

28.35

28.6

28.55

28.7

4

28.3

27.8

 

 

 

 

 

 

 

 

 

6

28.1

 

 

7

28.4

 

 

 

 

 

 

 

 

 

 

8

28.6

 

 

 

 

 

 

 

 

 

 

9

28.3

 

 

 

 

 

 

 

 

 

 

Average

28.2875

27.9

28.3

28.3

28.3

28.25

28.1

28.35

28.6

28.55

28.7

Difference
between previous and current latch

3.0

2.8

2.9

3.0

2.9

2.8

2.7

2.7

2.8

2.7

2.8
  • 0
    TI__Genius 9580 points

    Hello,

    Thank you for your concern. How are you measuring these temperature data points. What test setup are you using with the LM95071 samples?

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    Prodigy 10 points

    It is read the temperature data directly from inside the IC( LM95071CIMFX/NOPB(CIMF/NOPB)  and then diaplay it,there is no special process.

    LM95071 specification:please refer to the catalogue 8.6.1.2 Temperature Register:

    TablTable 3. (Read Only):
    D15   D14     D13    D12     D11    D10    D9    D8      D7     D6      D5    D4      D3      D2       D1   D0
    MSB Bit 12  Bit 11  Bit 10  Bit 9  Bit 8   Bit 7  Bit 6  Bit 5   Bit 4  Bit 3  Bit 2   Bit1  LSB 1    1      1


  • 0 in reply to kathyliu
    TI__Genius 9580 points

    Hello Kathyu Liu,

    The ±1°C and the ±2°C accuracy datasheet accuracy spec come from the expected temperature from the oil bath and comparing the read out from LM95071. It is recommended to use Oil Bath to test accuracy of a temperature measurement. What are you comparing the temperature results to?

    Best Regards,

    Meredith McKean

  • 0 in reply to Meredith McKean
    Prodigy 10 points

    Can i send you our samples,and help to analysis the temperature problem,and tell me your address.

  • 0 in reply to kathyliu
    TI__Genius 9580 points

    Hello Kathyliu,

    Lets first determine if this is a software or a hardware issue. Can you show me the SPI waveforms?

    Best Regards,

    Meredith McKean