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HDC3020-Q1: Configure Level of Heater Current

Ryan Wang
Expert 7435 points
Part Number: HDC3020-Q1
Other Parts Discussed in Thread: HDC3020

Tool/software:

Team,

Customer HDC3020 works fine already. They want to implement heater function for condensation remove now.

Customer enable heater with commander 0x30 0x6D run successfully.

But when they try to Configure & Read Back Heater Settings with commander 0x30 0x6E 0x3F 0xFF 0x06. The I2C write failed.

1. Why this command write fail?

2. What is default heater power level without configging it?

3. How to read back Heater power level setting?

4. I want to enable heater for 5 min and then disable it for 1 min and then do measurement. Is it OK?

  • +1
    TI__Expert 3385 points

    Hi Ryan,

    1. What is the order of the i2c transactions? The user must configure the heater first, then enable the heater. It seems like they might be doing it backwards. 

    2. Default heater configuration:

    • Power level default is close to quarter power (~66mW at 3.3V)
    • Resistor value default is 165ohms

    3. You can read back the heater settings with hex code 0x30 6E, please see the datasheet Table 7-4 HDC302x Command Table and Section 7.5.4 I2C Reads. 

    4. Yes the user can do that. They can also continue measuring while the heater is running, and observe the RH drop as the sensor is heated. A minute of recovery time after running the heater is likely enough to measure accurate RH readings again.

    Best,

    Sakeenah

  • 0 in reply to Sakeenah Khan
    TI__Expert 7435 points

    Sakeenah,

    Now customer power up silicon , then configure the heater first, then enable the heater. but it still fail.

    Very strange. They can config threshold successfully but only config heater fail. Do you have other comment?

  • 0 in reply to Ryan Wang
    TI__Expert 3385 points

    Hi Ryan,

    Can you tell me more about how did the customer verify the heater config failed? Are they able to verify the power/current draw or the heated device temperature? Are they just trying to read back the heater setting digitally? 

    Can you share any scope shots of the i2c communication?

    Best,

    Sakeenah

  • 0 in reply to Sakeenah Khan
    TI__Expert 7435 points

    Sakeenah,

    // Below is Set High Alert 80% RH 60 degree  address：0x611D  value：0xCD33  CRC：0xFD

    2E B2 04 00 3E 74 75 69 2D 6D 63 75 8A A4 00 61 1D 01 CD 33 FD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

    Cmd return success:

    I2C capture:

    // Below is Set Configure Heater Current Full Power  address：0x306E  value：0x3FFF  CRC：0x06

    2E B2 04 00 3E 74 75 69 2D 6D 63 75 8A A4 00 30 6E 01 3F FF 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

    Cmd sent successful. But return I2C write Fail.

    I2C capture is :

  • 0 in reply to Ryan Wang
    TI__Expert 3385 points

    Hi Ryan,

    Please give our team some time to check the i2c communication. In the meantime, can you please tell me more about how did the customer verify the heater config failed, is it that the sensor sent a NACK and that's why they log a "fail"? Are they able to verify the power/current draw or the heated device temperature? 

    Best,

    Sakeenah

  • 0 in reply to Sakeenah Khan
    TI__Expert 7435 points

    Sakeenah,

    I add some note for I2C signal capture. I found their command Set Configure Heater Current Full Power is wrong. I let them check their code.

    Thanks for your support 

    HDC3030 I2C.pptx