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HDC2010: How long does it need to wait for ready status of HDC2010 after soft reset?

Won Huh
Prodigy 10 points
Part Number: HDC2010

Hi,

In my experiment, it seems writing registers doesn't work right after soft reset (0x0E Reset and DRDY/INT Configuration Register bit 7)

It just shows reset values. However, when I add some delay like 1ms after soft reset and then write something to registers, it works.

Spec doesn't comment about delay for soft reset. Could you tell me how exactly long is the time to complete soft reset?

Thank you,

Won.

  • 0
    TI__Mastermind 43815 points
    Hi Won,
    We're on holiday the rest of the week, and we'll need to use lab to get the answer you're looking for. Please wait for a response next week.

    Thanks,
    Ren
  • 0 in reply to Ren Schackmann
    TI__Expert 5695 points
    Hi Won,

    The worst case scenario to start any RH or Temp measurements after reset should be the same as the power-up case described on section 7.5.2 of the data sheet, 3 msecs. I am listing the section as reference. There is no other relevant spec that we can share with you.

    7.5.2 I2C Interface
    The HDC2010 operates only as a slave device on the I2C bus interface. It is not allowed to have multiple devices
    on the same I2C bus with the same address. Connection to the bus is made through the open-drain I/O lines,
    SDA, and SCL. The SDA and SCL pins feature integrated spike-suppression filters and Schmitt triggers to
    minimize the effects of input spikes and bus noise. After power-up, the sensor needs at most 3 ms, to be ready
    to start RH and temperature measurement. After power-up the sensor is in sleep mode until a communication or
    measurement is performed. All data bytes are transmitted MSB first.

    Regards,
    Jose