• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 32 subscribers
  • Views 2175 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

HDC1080: a reason of humidity error

Shinichi Inoue
Guru 21841 points
Part Number: HDC1080


Dear Specialists,

My customer is designed and evaluating HDC1080 circuit.

The humidity is higher over 20% than reference humidity meter(Sato Keiryoki Mfg. Co., Ltd SK-110 type1).

They are appeared more than 10% of the total 100pcs. 

Temperature value corresponds closely. 

What reasons are considered.

Is an additional calibration needed?

Could you please confirm program flow listed below.

---question 1 <programing condition> Is there any problem or not?

(1) Configuration Resister Description(0x02)

(2) wait for over 20msec

(3) address pointer set 0x00 

(4) wait for over 20msec

(5) read temperature data

(6) wait for 20msec

(7) address pointer set 0x01

(8) wait for 20msec

(9) read humidity data

---question 2 

When data=0x020, data output 14bit

It also output lower 8bit in spite of not 0x00. Is it correct?

Or does it has to be ignored by host CPU?

---question3

Could you please see attached image.

It is initial setting of I2C data.

It can be seen 2 times command writing and ACK response.

Is there any problem?

---

I appreciate your great help in advance.

Best regards,

Shinichi

humidity data HDC1080 and reference.xlsx

  • 0
    TI__Expert 5695 points
    Our Humidity applications engineer will contact you very soon.
  • 0 in reply to Jose Arteaga4
    Guru 21841 points
    Hi Jose

    Thank you for your reply.

    I am looking forward to contacting from your Humidity application engineer.

    I appreciate your great help.

    Best regards,
    Shinichi
  • 0 in reply to Shinichi Inoue
    Guru 21841 points
    Hi Jose

    How is the condition?

    We cannot move forward without your reply. All the process have been stopped at the moment.

    I appreciate your great help and cooperation.

    Best regards,
    Shinichi
  • 0 in reply to Shinichi Inoue
    TI__Expert 5145 points

    Hi Shinichi,

    due to the fact that 10% of the devices shows a bad behavior, I suppose that it could be due to a problem in the solder of the devices. Is it possible that the bad parts have been contaminated during the soldering process? Could you please forward to us an high resolution picture of one of the parts that present the problem (with special zoom on the sensing element).

    Regarding your other questions:

    1. The program flow it is correct;
    2. I have not understand very well your question: could you please rephrase it?
    3. It is ok to send a soft reset to the device, but your customer should wait about 10msec after the soft reset before to configure the device.

    Please let me know if you have nay doubts or needs firther information.

    Best regards,

    Carmine