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HDC1000 Response Time

EJ Kohler
Intellectual 870 points
Other Parts Discussed in Thread: HDC1000

Hi,

My customer needs 0.5s@5m/s response time.

I dont see these units on the datasheet. Is it possible I'm missing this?

Thanks,

EJ

  • 0
    TI__Intellectual 1960 points

    Hi EJ

    Not sure to have well understood your question.

    No problem to have a 0.5sec period for the conversion. To do this a new conversion has to be triggered every 0.5sec.

    Regarding the 5ms response time the situation is the following:

    To have an accurate measurement we suggest to convert always both humidity and temperature

    The conversion time depends on the selected resolution:

    –Humidity
    •8 bit   (Conversion time 2.5ms (typ.))
    •11 bit (Conversion time 3.7ms (typ.))
    •14 bit (Conversion time 6.5ms (typ.))
    –Temperature
    •11 bit (Conversion time 3.7ms (typ.))
    •14 bit (Conversion time 6.5ms (typ.))

    Selecting Humidity 8 bit resolution and Temperature 11bit the conversion time is: 2.5+3.7= 6.2ms

    Please let me know if it answer to the customer questions.

    Regards

    Massimo

  • 0 in reply to Massimo Mascotto
    TI__Intellectual 870 points
    Hi Massimo,

    From the customer:

    I am looking for response time and not the conversion time. I would like to know how many seconds it needs when there is 5m/s airflow (5 meters/sec).

    Example in this datasheet, when you look at the resolution it shows 18sec for 1m/s airflow. Ideally the I am looking for 0.5s@5m/s.
    www.silabs.com/.../Si7005.pdf

    Thanks,
    EJ
  • 0 in reply to EJ Kohler
    TI__Intellectual 1960 points

    We don't have the right set up to test the response time as you request.

    Our set up has a fixed air flow at 1m/s.

    Best Regards

    Massimo

  • 0 in reply to Massimo Mascotto
    TI__Intellectual 870 points

    Is there a way to adjust the test to get the information the customer needs?

    Thanks,

    EJ

  • 0 in reply to EJ Kohler
    TI__Intellectual 1960 points
    Unfortunately not with the current set up

    Massimo
  • 0 in reply to EJ Kohler
    Prodigy 40 points

    Hi 

    Customer have configured the HDC1000 in both temp & Humidity conversion mode[Writing 0x1000 in to configuration register(address:0x02)], and their feedback as below

    1)I am getting 0xFFFC as same value for both temp & Humidity when I am following the below sequence
    start,address+w,00(pointer register), stop command, wait for DRDYn to be low , start, address+Read.

    2)I am not getting the signal DRDYn  asserted if stop command is not given after start,address+w,00(pointer register).

    Kindly suggest whether stop command need to be given after the Trigger of start temperature & humidity conversion[by attempting writing 0X00 in Pointer register] before giving the read command of both Temperature & Humidity at a time.


    Pls adv

  • 0 in reply to Massimo Mascotto
    Prodigy 40 points

    Hi Massimo

    Customer have configured the HDC1000 in both temp & Humidity conversion mode[Writing 0x1000 in to configuration register(address:0x02)], and their feedback as below

    1)I am getting 0xFFFC as same value for both temp & Humidity when I am following the below sequence 
    start,address+w,00(pointer register), stop command, wait for DRDYn to be low , start, address+Read.

    2)I am not getting the signal DRDYn  asserted if stop command is not given after start,address+w,00(pointer register). 

    Kindly suggest whether stop command need to be given after the Trigger of start temperature & humidity conversion[by attempting writing 0X00 in Pointer register] before giving the read command of both Temperature & Humidity at a time.


    Pls adv