HDC2080: Some questions

1. The process flow to prevent the condensation (5’C- -40’C environment for cold-chain application)
   1. Briefly turn on the heater to prevent and condensation or build up of water on the humidity sensor.
2. The effects of thermal sensor after internal heater on.90mA of current to heat the device, and will heat up the sensor as
   1. The heater pulls ~90mA of current to heat the device, and will heat up the sensor as a result.  To record accurate temperature information you will need to allow the sensor to cool to ambient conditions.
3. The mechanical design for humidity.
   1. Do you mean an example of an enclosed casing, or do you mean packaging information?
4. How to assess the power consumption?
   1. Do you mean you need the ability to track the amount of power the device is consuming?

Regarding the question about the RH Supply Current of 650uA, please note the (1) footnote next to this parameter description. (1) I2C read/write communication and pull up resistors current through SCL, SDA not included.  This footnote explains that most of this current is a result of I2C communication. During writes/read current is being sourced/sunk through these pullup resistors.  This current value does not reflect the amount of current consumption when the part is idle or in sleep mode.

Best Regards,

Matt

Hi Sirs,

Please refer our update as below

Briefly turn on the heater to prevent and condensation or buildup of water on the humidity sensor.

We need the flow for the reference, like this:

-       turn on the sensor power or wake up the sensor,

-       heater ON for 1sec to hydrate the cave, OFF for 10sec to cool down,

-       convert and read the RH & TEMP data,

-       go to sleep or sensor power off.

The heater pulls ~90mA of current to heat the device, and will heat up the sensor as a result.  To record accurate temperature information you will need to allow the sensor to cool to ambient conditions.

what’s the recommended time on the heater ON and OFF?

Do you mean an example of an enclosed casing, or do you mean packaging information?

 Enclosure casing design per the talk in the meeting yesterday,

by the way, is the chip working under high level humidity, even few condensation on the pins of the sensor chip?

Do you mean you need the ability to track the amount of power the device is consuming?

Yes, I need the methodology to assess the power consumptions and how to derive the 0.55uA per second reading.  I’m a bit confused of the IDD supply current on the spec

.

Regarding the question about the RH Supply Current of 650uA, please note the (1) footnote next to this parameter description. (1) I2C read/write communication and pull up resistors current through SCL, SDA not included.  This footnote explains that most of this current is a result of I2C communication. During writes/read current is being sourced/sunk through these pullup resistors.  This current value does not reflect the amount of current consumption when the part is idle or in sleep mode.