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HDC2010: General Question

Liang Tsai
Expert 4760 points
Part Number: HDC2010

Tool/software:

Hi teams,

Customer has questions regarding to the product HDC2010.

  1. Just want to clarify if the turning on test process is correct:  Sensor at sleep mode(default) >> Trigger on Demand mode >> Turn OFF the system but keep the sensor ON>> Read the maximum humidity data from the sensor after it turn on again
  2. what state should other pins remain after setting up the system? As the system go OFF after setting up, should SDA/SCL/INT state stay unchanged as before(OFF)?

Thanks for the help.

Best,

Liang Tsai

  • +1
    TI__Expert 3355 points

    Hi Liang Tsai,

    After power up, the HDC2010 defaults to Sleep Mode and waits for an I2C instruction.

    There are 2 types of measurement modes available: Trigger on Demand and Auto Mode. Trigger on Demand is when each measurement reading is initiated through an I2C command on an as-needed basis. after the measurement is converted, the device remains in sleep mode until another I2C command is received. 

    I'm sorry, I'm not sure I understand the question. What do you mean by system OFF? Is the HDC2010 still powered on, and are you referring to the Sleep Mode? If that is the case, then: 

    1. I think that is correct. Basically this is the procedure:
      Sensor in Sleep Mode (default) > Send I2C command for Trigger on Demand measurement mode > Read the humidity value > Sensor in Sleep Mode until another measurement command is received
    2. The HDC2010 has basic I2C communication protocol. When the HDC2010 is in Sleep Mode and you don't need to communicate, the MCU can release the HDC2010's SCL/SDA/INT pin and leave it floating, and the pullup resistor should pull high. Then when you need to send an I2C command, the master can generate a START condition to begin communicating. 

    Let me know if that does not answer your question. 

    Best regards,

    Sakeenah Khan