Texas Instruments HDC1050EVM Manuel utilisateur

HDC1050EVM User 's Guide

User's Guide

Literature Number: SNAU181A

June 2015–Revised June 2015

User's Guide

SNAU181A–June 2015–Revised June 2015

HDC1050EVM User 's Guide

1 Introduction

The Texas Instruments HDC1050EVM evaluation module (EVM) enables designers to evaluate the

operation and performance of the HDC1050 Relative Humidity and Temperature sensor.

The EVM contains one HDC1050 (See Table 1).

Table 1. Device and Package Configurations

DEVICE IC PACKAGE

U1 HDC1050 PWSON 6pin

The EVM hosts an MSP430F5528 microcontroller (µC) as well as the HDC1050. The µC is used to control

the HDC1050 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 so that the user can

remotely locate the sensor from the µC section.

2 Setup

This section describes the connectors on the EVM as well and how to properly connect, set up and use

the HDC1050EVM.

Figure 1. HDC1050EVM

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Setup

2.1 Input/Output Connector Description

2.1.1 J1 – 5x1 Header

This header is not populated and can be installed if the EVM is broken in 2 sections: PC interface and

Sensor. This connector with its counterpart J2 allows the communication of the two sections through a 4-

wire cable.

Pin out:

• J1.1 GND

• J1.2 SDA

• J1.3 SCL

• J1.4 DRDYn (NOTE: this signal is not supported by the HDC1050, and does not need to be

connected to a host controller)

• J1.5 VDD

2.1.2 J2 – 5x1 Header

This header is not populated and can be installed if the EVM is broken in 2 sections: PC interface and

Sensor. This connector with its counterpart J1 allows the communication of the two sections through a 5-

wire cable.

Pin out:

• J2.1 GND

• J2.2 SDA

• J2.3 SCL

• J2.4 DRDYn (NOTE: this signal is not supported by the HDC1050n and does not need to be

connected)

• J2.5 VDD

2.1.3 J3 – USB Type A Connector

This connector is used for communications with the PC and provides power for the EVM.

2.2 Hardware Setup

The HDC1050EVM power is supplied via the USB connector. The LDO (U4) converts the 5V from the

USB to 3.3V used by the HDC1050 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 I2C address of the HDC1050 is 1000000xb and is fixed by design.

The EVM features a Spy-by-Wire interface to the MSP430 that enables custom firmware development and

debug using Code Composer Studio ©.

2.3 Software Setup

2.3.1 System Requirements

The Sensing Solutions GUI supports:

• 64-bit Windows 7

• 64-bit Windows XP

The current GUI does not support 32-bit Windows operating systems. The host machine is required for

device configuration and data streaming. The following steps are necessary to prepare the EVM for the

GUI:

• The GUI and EVM driver must be installed on the host.

• The EVM must be connected to a full speed USB port (USB 1.0 or above).

SNAU181A–June 2015–Revised June 2015 HDC1050EVM User 's Guide

Setup

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2.3.2 Sensing Solutions GUI and EVM Driver Installation

The Sensing Solutions GUI and EVM driver installer is packaged in a zip file. Follow these steps to install

the software.

1. Download the software ZIP file from the EVM tool page

2. Extract the downloaded ZIP file

3. Run the included executable

4. Follow all directions from the installer

Figure 2. GUI Installer Welcome Page

5. Read the license agreement and if you still wish to install the software, select “I accept the agreement”

and click “Next” as shown in

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Setup

Figure 3. GUI Installer License Agreement

6. Select the installation directory. If the user installing the software is not a system administrator a

directory not with “Program Files” should be chosen instead of the default.

Figure 4. GUI Installer Installation Directory

7. Wait for all files to install

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Figure 5. GUI Installer Copying Files

8. After the files have copied a device driver installer will start. If prompted about an unsigned driver,

choose to install the driver anyways. If running Windows 8 or 8.1, the PC must be started in a “Safe”

mode to install the unsigned driver.

Figure 6. EVM Driver Installer Welcome Page

9. Wait for the driver to install

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Figure 7. EVM Driver Installer In Progress

10. Click “Finish” after the driver has been installed

Figure 8. EVM Driver Installer Complete

11. Click “Finish” to complete the software installation

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Figure 9. GUI Installer Complete

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Setup

2.4 Operation

When the EVM is connected the host computer, the latter should automatically detect the device as an

HDC1050EVM/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 HDC1050EVM can be broken into 2 sections to isolate the thermal mass of the µC from the

HDC1050. The yellow arrow in Figure 10 shows the board perforations that allow the two sections to be

broken apart.

Figure 10. HDC1050EVM 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 HDC1050. 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

HDC1050 is 5.5mm x 5mm.

Figure 11. HDC1050EVM Small Sensor Section

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The communications with the µC section is achieved through a 4-wire cable soldered at the pads

accessible on the bottom layer of the PCB (Refer to Figure 12).

Figure 12. HDC1050EVM Pads for I2C and Supply of the Smaller Sensor Section

3 GUI Operation

The section describes how to use the GUI

3.1 Starting the GUI

Follow these steps to start the GUI:

1. Select the windows start menu

2. Select “All programs”

3. Select the “Texas Instruments” folder

4. Select the Sensing Solutions GUI

5. Click “Sensing Solutions GUI”

6. Splash screen will appear for at least two seconds.

• Slower PC’s may show a blank splash screen without any texts for up to 20 seconds

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