Texas Instruments HDC2022EVM User manual

HDC2022EVM
User's Guide
Literature Number: SNIU039
December 2019

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Table of Contents
Contents
1 Trademarks......................................................................................................................... 4
2 Quick Start.......................................................................................................................... 5
3 EVM GUI ............................................................................................................................. 6
3.1 Software Setup........................................................................................................... 6
4 GUI Operation...................................................................................................................... 7
4.1 Home Tab................................................................................................................. 7
4.2 Data Capture Tab ........................................................................................................ 8
4.3 EVM Settings Tab........................................................................................................ 9
4.4 Device Configuration................................................................................................... 10
4.5 Registers Tab ........................................................................................................... 11
4.6 Collateral Tab ........................................................................................................... 12
5 EVM Hardware .................................................................................................................. 13
5.1 Input/Output Connector Description.................................................................................. 13
5.2 EVM Operating Conditions ........................................................................................... 13
5.3 Device Address Configuration ........................................................................................ 14
5.4 Reducing the Sensor's Thermal Mass............................................................................... 15
6 Updating Firmware on HDC2022EVM.................................................................................... 17
7 Board Layout..................................................................................................................... 19
8 Schematic ......................................................................................................................... 20
9 HDC2022EVM Bill of Materials.............................................................................................. 21

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List of Figures
List of Figures
1 HDC2022DEB with ePTFE Filter ......................................................................................... 4
2 HDC2022EVM GUI on first startup........................................................................................ 5
3 Download Pop-Up ........................................................................................................... 6
4 Home Tab of HDC2022EVM GUI ......................................................................................... 7
5 Data Capture Tab of HDC2022EVM GUI................................................................................. 8
6 EVM Setup Tab of HDC2022EVM GUI................................................................................... 9
7 Device Configuration Tab of HDC2022EVM GUI...................................................................... 10
8 Register Tab of HDC2022EVM GUI..................................................................................... 11
9 Collateral Tab of HDC2022EVM GUI.................................................................................... 12
10 HDC2022EVM.............................................................................................................. 13
11 HDC2022EVM : Sensor Module.......................................................................................... 14
12 HDC2022EVM: Layout Resistors for I2C Address Setting - Top .................................................... 14
13 HDC2022EVM: PC Interface and Sensor Module ..................................................................... 15
14 HDC2022EVM: PC Interface and Smaller Sensor Module ........................................................... 15
15 HDC2022EVM: Pads for I2C and Supply of the Smaller Sensor Module .......................................... 16
16 HDC2022EVM Spy-Bi-Wire programming connections............................................................... 17
17 UniFlash Launch Screen, MSP430F5528 device selected. .......................................................... 18
18 Top Layer Routing ......................................................................................................... 19
19 Bottom Layer Routing...................................................................................................... 19
20 HDC2022EVM Schematic................................................................................................. 20
List of Tables
1 Device and Package Configurations ...................................................................................... 4
2 EVM Temperature Range................................................................................................. 13
3 I2C Address................................................................................................................. 14

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HDC2022EVM User's Guide
User's Guide
SNIU039–December 2019
HDC2022EVM User's Guide
The Texas Instruments HDC2022EVM evaluation module (EVM) enables designers to evaluate the
operation and performance of the HDC2022 Relative Humidity and Temperature Sensor.
The EVM contains one HDC2022 (see Table 1).
Table 1. Device and Package Configurations
DEVICE IC PACKAGE
U1 HDC2022DEB WSON (6-pin) DEB
The EVM hosts an MSP430F5528 microcontroller (µC) as well as the HDC2022. The µC is used to control
the HDC2022 and communicate with a host PC through a USB port. The EVM is designed to be broken
into two sections if desired. The sensor section can be separated from the µC section of the board to
reduce thermal mass surrounding the HDC2022.
Figure 1. HDC2022DEB with ePTFE Filter
1 Trademarks
All trademarks are the property of their respective owners.

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HDC2022EVM User's Guide
2 Quick Start
1. Click here in Safari, Firefox, or Chrome and select the HDC202xEVM GUI from the gallery to access
the cloud-based GUI. The browser window should appear as in Figure 2. Follow the onscreen
instruction to complete setup.
Figure 2. HDC2022EVM GUI on first startup
2. Reload the browser window after installation to access the home screen of the HDC2022EVM GUI.
3. Connect the HDC2022EVM to the USB port of your computer via USB. Drivers for the device will install
automatically and the GUI will connect to the EVM.
4. Temperature and humidity data can be recorded and logged on the data capture tab. Select the
icon to navigate to this page. You can enable register auto-read from this page, and initiate a one-shot
to take sample data.
5. Configure device settings from the device configuration tab .
6. Register, bit-field, and bit level configuration can be performed from the register tab .
See Section 4 for more information on GUI tabs, operation, and installation of the local version of the
HDC2022EVM GUI.

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3 EVM GUI
3.1 Software Setup
The PC GUI software for the HDC2022EVM runs on TI's GUI composer framework. The software is
available as a live version which runs in your browser, and is available as a download for offline use. The
software is compatible with Windows, Mac, and Linux Operating systems.
3.1.1 Live Software on dev.ti.com
The live software currently works within Chrome, Firefox and Safari browsers. Internet Explorer and Edge
browsers are not supported. User can access the live version through one of the following actions:
• Go to the HDC2022EVM Tool page on TI.com and click on the View Button
• Go to dev.ti.com/gallery and search for the HDC2022EVM.
Click on the application icon within the gallery to launch the software. Follow the prompts onscreen to
install the TI Cloud Agent Bridge browser plugin.
3.1.2 Offline Software
3.1.2.1 Download GUI from dev.ti.com
Users can access the latest version of the offline software by navigating to the live version as noted
above. Look for the download icon and download both the application and runtime for the operating
system as shown in the download pop-up. After download, unzip and run the downloaded executable file.
Follow the onscreen instructions to install the local version of the GUI.
Figure 3. Download Pop-Up

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4 GUI Operation
The section describes how to use the HDC2022EVM GUI
4.1 Home Tab
The Home Tab is shown at software launch. The Learn More link displays the key features and a
functional diagram for the HDC2022 device. The icons on the left side of the screen are shortcuts which
can be used for navigation to other tabs within the GUI.
Figure 4. Home Tab of HDC2022EVM GUI

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4.2 Data Capture Tab
The Data Capture tab reports the temperature and humidity from the HDC2022 device included on the
HDC2022EVM. To enable data capture, ensure that an auto-read delay from the drop down menu at the
top of the page is selected.
Each selection option/button on this tab has a specific function as described below:
•Register Auto Read Delay: Changes the delay between register reads
•Measurement Configuration: Configures the HDC2022 to return temperature, humidity, or both.
•Humidity/Temperature Resolution: Change the number of measurement bits for
humidity/temperature measurements.
•Auto Measurement Mode: Set the auto-measurement frequency of the HDC2022.
•Start Measurement/One-Shot Button: In shutdown mode, this button triggers a measurement. When
an auto-measurement frequency is selected, this button begins measuring from the HDC2022.
•Celsius/Fahrenheit Select: Sets the GUI to display in Celsius or parenthetic. This does not change
settings for the HDC2022 or EVM.
•Activate Soft Reset Button: Triggers a soft reset of the HDC2022.
•Activate Heater Button: Enables the heater on the HDC2022.
Figure 5. Data Capture Tab of HDC2022EVM GUI

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4.3 EVM Settings Tab
The EVM Settings tab allows for setup of features for the USB to I2C bridge and EVM GUI. Selecting an
alternate I2C address will disconnect the GUI from the USB device. The EVM must be modified as
discussed in Section 5.3 to use the alternate address.
Each selection option/button on this tab has a specific function as described below:
•I2C Frequency: Change the communication frequency between the control board and HDC2022EVM.
•I2C Address: Selects the address option of the HDC2022.
•Firmware Read Button: Reads the current version of the EVM firmware.
•ID Registers Indicators: Returns the value of the HDC2022 ID registers.
•Scaling Mode: Set to Fixed/Auto to control the scaling of the graph on the Data Capture Tab.
•Scaling Min/Max Temp/Humidity: Set the min and max values for the temperature and humidity
graph on the Data Capture Tab.
Figure 6. EVM Setup Tab of HDC2022EVM GUI

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4.4 Device Configuration
The Device Configuration tab allows for easy configuration and setup of the HDC2022 device included on
the HDC2022EVM. If immediate write mode is selected on the Section 4.5, then changes made in the
selection boxes will be written to the HDC2022 device as soon as possible.
The Auto Measurement Mode, Temperature/Humidity Resolution, Measurement Configuration, activate
Soft Reset, and Activate Heater widgets perform the same functions as on the Data Capture tab (refer to
Section 4.2.) The other widgets are described below:
•DRDY/INT_EN Pin Configuration: Selects the output for the HDC2022 interrupt pin
•Interrupt Polarity: Selects the active/inactive state of the HDC2022 interrupt pin
•Interrupt Mode: Sets the behavior of the HDC2022 interrupt pin.
•Humidity/Temperature Offset: Sets the value of respective offset register within the HDC2022.
•Humidity/Temperature Threshold: Sets the value of the threshold registers within the HDC2022.
•HDC2022 Interrupt/DRDY Configuration Enable Bits: Selects the source of the HDC2022 Interrupt.
Figure 7. Device Configuration Tab of HDC2022EVM GUI

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4.5 Registers Tab
The Registers tab allows for user interaction with the HDC2022 device onboard the EVM at the register,
bit, and bitfield level.
The Auto read drop-down box configures the rate of polling the register contents. When Auto-Read is off,
it is necessary to click Read Register to fetch the contents of the current register. Read All Registers can
be used to fetch the contents of all registers at once.
The Write Register buttons are disabled when the drop-down next to these buttons is set to immediate
mode. Immediate mode will trigger a write operation each time a register is modified. When deferred mode
is selected, the write register button is enabled, and write operations will be performed only when the write
register button is clicked. These settings give the user control over I2C bus activity, and enable individual
transactions which can be easily observed via oscilloscope, logic analyzer, or bus-sniffing device.
Figure 8. Register Tab of HDC2022EVM GUI

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4.6 Collateral Tab
The Collateral tab contains links to articles, guides, reports, and videos which are relevant to the
HDC2022 device. This includes the device datasheet and EVM User's Guide.
Figure 9. Collateral Tab of HDC2022EVM GUI

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5 EVM Hardware
This section describes the connectors on the EVM and how to properly connect, setup and use the
HDC2022EVM.
Figure 10. HDC2022EVM
5.1 Input/Output Connector Description
5.1.1 J1 & J2 – 5x1 Headers
These headers are not populated and can be installed if the EVM is broken in two sections: PC interface
and Sensor. J1 and J2 allowfor communication of the two sections using a 5-wire cable.The plated
through-holes may also be used as a point to probe these signals during EVM operation.
Jx.1 GND
Jx.2 SDA
Jx.3 SCL
Jx.4 INT
Jx.5 VDD
5.1.2 USB Type A Connector
This connector is used for communications with the PC and provides power for the EVM.
5.2 EVM Operating Conditions
The HDC2022EVM power is supplied via the USB connector. The LDO (U4) converts the 5V from the
USB to 3.3V used by the HDC2022 and the MSP430. The EVM may be directly inserted into a USB port
on a PC or laptop, or may be connected to the latter using the appropriate USB cable.
The controller and device sides of the EVM have different temeperature limits as shown in Table 2. These
are set by the onboard MSP430F5528 and the HDC2022 ICs on the controller and breakout portions
respectively.
Table 2. EVM Temperature Range
Board Section Conditions Temperature Range
Controller board Recommended Operating TjRange -40 °C to 85 °C
Absolute Maximum Tstg -55 °C to 150 °C
HDC2022 breakout Recommended Operating TjRange -20 °C to 70 °C
Absolute Maximum Tstg -65 °C to 150 °C

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5.3 Device Address Configuration
The onboard HDC2022's I2C address is set to 1000001xb on the EVM. This is done by setting the ADDR
pin to VDD via a 0 ohm resistor (R4) (refer to Figure 11).
Figure 11. HDC2022EVM : Sensor Module
To change the I2C address to 0x40, remove 0 Ωresistor R4 (refer to Figure 12 ).
Figure 12. HDC2022EVM: Layout Resistors for I2C Address Setting - Top
Table 3. I2C Address
ADDR R4 HDC2022 ADDRESS
VDD Populated 1000001
Float Removed 1000000
In Table 3, the EVM default configuration is in bold.

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5.4 Reducing the Sensor's Thermal Mass
The HDC2022EVM can be broken into 2 sections to isolate the thermal mass of the µC from the
HDC2022. Figure 13 shows the board perforations that allow the two sections to be broken apart.
Figure 13. HDC2022EVM: PC Interface and Sensor Module
The communication between the two modules is ensured through the connector J1 and J2 and a 5-wire
cable. In this configuration the thermal mass of the EVM is dramatically reduced, improving the
temperature measurements performances of the HDC2022. 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 in Figure 14. The PCB segment that hosts the HDC2022 is 5.5mm x 5mm.
Figure 14. HDC2022EVM: PC Interface and Smaller Sensor Module
Also in the case where the EVM is broken into two sections it is still possible to use the GUI (ensuring the
connections between the modules) or alternatively it is possible to connect the sensor module to a custom
micro-controller. (Refer to Figure 15).

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Figure 15. HDC2022EVM: Pads for I2C and Supply of the Smaller Sensor Module

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6 Updating Firmware on HDC2022EVM
By default the HDC2022EVM will come programmed with the correct firmware for operation, the
instructions in this section provide guidance on how to reflash the firmware in the event an upgrade is
required, or if the board firmware has become corrupted because of misuse.
The primary method for flashing the HDC2022EVM is Spy-Bi-Wire. In order to reflash the firmware you will
need the following:
• PC
• HDC2022EVM to be flashed
•MSP-EXP430F5529LP and included USB connection cable
• 3 x Male to Female Jumper Cables
• UniFlash (Offline or Cloud Version)
– Install Offline version from: http://www.ti.com/tool/UNIFLASH
– Cloud version is accessible here: http://dev.ti.com/gallery/
To update the firmware on the HDC2022EVM complete the procedure below:
1. Plug in the HDC2022EVM to the PC via USB Connector to provide power to the EVM.
2. Connect another USB cable to the MSP-EXP430F5529LP
3. Remove the SBW RST and SBW TST Jumpers on the MSP-EXP430F5529LP board
4. Create a wiring harness by connecting jumpers to SBW RST, SBW TST, and GND on the MSP-
EXP430F5529LP.
5. Insert the male end of the jumpers through the SWBTCK, SBWTDIO, and GND through holes on the
HDC2022EVM. These are shown in Figure 16. Make these connections as follows:
• SBW RST ↔SBWTDIO
• SBW TST ↔SBWTCK
• GND ↔GND
Figure 16. HDC2022EVM Spy-Bi-Wire programming connections
6. Open UniFlash.
7. Select MSP430F5528 as the target, select your connection and click Start

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Figure 17. UniFlash Launch Screen, MSP430F5528 device selected.
8. Browse to the firmware file named USB2ANY-F5528-24MHZ.txt and select Load Image.
Upon successful programming, the firmware image will be loaded and the HDC2022EVM will
automatically restart. The HDC2022EVM firmware upgrade is then complete.

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7 Board Layout
Figure 18 and Figure 19 show the board layout for the HDC2022EVM.
Figure 18. Top Layer Routing
Figure 19. Bottom Layer Routing

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8 Schematic
Figure 20. HDC2022EVM Schematic