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Setup
9
SNAU189A – December 2015 – Revised October 2017
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HDC1080EVM User 's Guide
2.4
Operation
When the EVM is connected the host computer, the latter must automatically detect the device as an
HDC1080EVM/HDC1000EVM.
Launch the GUI. A detailed description of the GUI operation is presented later in this document.
2.5
Reducing the Sensor Thermal Mass
The HDC1080EVM can be broken into 2 sections to isolate the thermal mass of the µC from the
HDC1080. The yellow arrow in
Figure 10
shows the board perforations that allow the two sections to be
broken apart.
Figure 10. HDC1080EVM µC and Sensor Sections
The communication between the two modules is achieved through the connectors J1 and J2 and a 4-wire
cable. In this configuration the thermal mass of the EVM is dramatically reduced, improving the
temperature measurement performance of the HDC1080. The cable connecting J1 to J2 must conform to
I2C cable length constraints. When used in this configuration, the GUI can still be used to communicate
with the EVM and collect data.
If the thermal mass of the sensor section is still excessive, the sensor section can be reduced by breaking
it at the perforation shown by the yellow arrow, indicated in
Figure 11
. The PCB segment that hosts the
HDC1080 is 5.5mm x 5mm.
Figure 11. HDC1080EVM Small Sensor Section