Texas Instruments TMP468EVM User manual

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TMP468EVM and TMP468QFNEVM
User's Guide
SBOU184B–November 2016–Revised August 2019
TMP468EVM and TMP468QFNEVM
This user's guide describes the characteristics, operation, and use of both the TMP468EVM and
TMP468QFNEVM evaluation boards. This user's guide discusses how to set up and configure the
software, reviews the hardware, and reviews various aspects of the software operation. Throughout this
document, the terms evaluation board,evaluation module, and EVM are synonymous with the
TMP468EVM and TMP468QFNEVM. This user's guide also includes information regarding operating
procedures, the input and output connections, an electrical schematic, printed-circuit board (PCB) layout
drawings, and a parts list for the EVM.
Figure 1. TMP468EVM Top Side
Figure 2. TMP468QFNEVM Top Side
Figure 3. EVM Bottom Side

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Contents
1 Overview...................................................................................................................... 3
2 Theory of Operation for the EVM Hardware ............................................................................. 4
3 EVM Hardware Overview................................................................................................... 5
4 TMP468EVM Software Overview ......................................................................................... 7
5 EVM Documentation....................................................................................................... 22
List of Figures
1 TMP468EVM Top Side ..................................................................................................... 1
2 TMP468QFNEVM Top Side................................................................................................ 1
3 EVM Bottom Side............................................................................................................ 1
4 Hardware Included With EVM Kit.......................................................................................... 3
5 EVM Hardware Overview................................................................................................... 4
6 Confirmation of USB-to-I2C Converter Driver Installation............................................................... 5
7 EVM Address Pin Hole Connections...................................................................................... 6
8 Remote Junction Transistors............................................................................................... 6
9 Connection for NPN Transistors Q1 to Q8............................................................................... 6
10 Gallery Home Page.......................................................................................................... 7
11 Cookies Agreement ......................................................................................................... 8
12 TMP468EVM GUI Download From the Gallery.......................................................................... 9
13 GUI Composer Runtime Wizard ......................................................................................... 10
14 TMP468EVM GUI License Agreement ................................................................................. 10
15 GUI Composer Installation Directory .................................................................................... 11
16 Ready to Install ............................................................................................................ 11
17 Installing GUI Composer Runtime ....................................................................................... 12
18 TMP468EVM Installation Finish ......................................................................................... 12
19 TMP468EVM Home Tab ................................................................................................. 13
20 TMP468EVM Quick Start Tab ........................................................................................... 14
21 Quick Start Connection Check ........................................................................................... 15
22 Quick Start Guide ......................................................................................................... 16
23 TMP468EVM Basic Settings Tab ....................................................................................... 17
24 TMP468EVM Basic Settings Tab ....................................................................................... 18
25 Threshold Sliders .......................................................................................................... 19
26 TMP468EVM Register Tab ............................................................................................... 20
27 TMP468EVM Collateral Tab ............................................................................................. 21
28 EVM Board Schematic .................................................................................................... 22
29 TMP468EVM Components Layout....................................................................................... 23
30 TMP468QFNEVM Components Layout................................................................................. 23
List of Tables
1 EVM Kit Contents............................................................................................................ 3
2 Related Documentation..................................................................................................... 3
3 TMP468 Slave Address Options........................................................................................... 6
4 EVM Bill of Materials ...................................................................................................... 24
Trademarks
Windows is a registered trademark of Microsoft Corporation.
All other trademarks are the property of their respective owners.

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1 Overview
The TMP468 is a high-accuracy, low-power, remote temperature sensor monitor with a built-in, local
temperature sensor. The remote temperature sensors are typically low-cost, discrete, NPN or PNP
transistors, substrate thermal transistors, or diodes that are integral parts of microprocessors,
microcontrollers, or field-programmable gate arrays (FPGAs). Temperature is represented as a 12-bit
digital code for both the local and remote sensors, providing a resolution of 0.0625°C. The two-wire serial
interface accepts the SMBus communication protocol with up to four different pin-programmable
addresses.
1.1 EVM Kit Contents
Table 1 details the contents of the EVM kit, and Figure 4 illustrates all of the included hardware. Contact
the Texas Instruments Product Information Center nearest you if any component is missing. It is highly
recommended that you check the TI website at http://www.ti.com to verify that you have the latest versions
of the related software.
Table 1. EVM Kit Contents
ITEM QUANTITY
PCB test board: TMP468EVM or TMP468QFNEVM 1
USB cable extender 1
Figure 4. Hardware Included With EVM Kit
1.2 Related Documentation From Texas Instruments
The following documents provide information regarding Texas Instruments integrated circuits used in the
assembly of the TMP468EVM and TMP468QFNEVM. This user's guide is available from the TI website
under literature number SBOU184. Any letter appended to the literature number corresponds to the
document revision that is current at the time of the writing of this document. Newer revisions may be
available from the TI website at www.ti.com, or call the Texas Instruments Literature Response Center at
[phone], or the Product Information Center at [phone]. When ordering, identify the
document by both title and literature number.
Table 2. Related Documentation
DOCUMENT LITERATURE NUMBER
TMP468 Product Data Sheet SBOS762

USB-to-I2C
Converter
(MSP430) TMP468
Remote 1 Remote 2 Remote 3 Remote 4 Remote 5 Remote 6 Remote 7 Remote 8
USB I2C
Dashed lines represent breakable connections on PCB.
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2 Theory of Operation for the EVM Hardware
The EVM consists of three sections that can be separated by breaking the PCB at the perforations. The dashed lines in Figure 5 represent
sections of the PCB that can be separated. The left-most section contains a standard USB Type A connector and a MSP430 microcontroller acting
as a USB-to-I2C converter. The middle section features the TMP468 device as well as the recommended passive components. The right-most
section provides eight discrete transistors that can be used as remote junctions for sensing temperature.
If the left and middle sections of the PCB are separated, they can be reconnected remotely using the 0.1-inch spaced pin holes provided. All of the
pin holes serve as test points, and are labeled on the back of the PCB. The middle section featuring TMP468 may be connected to another I2C
host for evaluation. In the remote junction section of the PCB, each individual transistor may be separated and re-wired for remote testing.
Figure 5. EVM Hardware Overview

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3 EVM Hardware Overview
CAUTION
Many components on the EVM are susceptible to damage by electrostatic
discharge (ESD). Customers are advised to observe proper ESD handling
precautions when unpacking and handling the EVM, including the use of a
grounded wrist strap at an approved ESD workstation.
3.1 Connecting the USB Cable to the USB-to-I2C Converter
Figure 6 shows the typical response to connecting the USB-to-I2C converter board to a PC USB port for
the first time. Typically, the computer responds with a Found New Hardware, USB device pop-up dialog.
The pop-up window then typically changes to Found New Hardware, USB Human Interface Device. This
pop-up indicates that the device is ready to be used. The USB-to-I2C converter uses the human interface
device drivers that are part of the Microsoft Windows®operating system.
Figure 6. Confirmation of USB-to-I2C Converter Driver Installation
In some cases, the Windows Add Hardware Wizard is shown. If this prompt occurs, allow the system
device manager to install the human interface drivers by clicking Yes when requested to install drivers.
Windows confirms installation of the drivers with the message shown in Figure 6.
3.2 EVM Features
This section describes some of the hardware features present on the EVM.
3.2.1 USB-to-I2C Converter Firmware
The USB-to-I2C converter included in the EVM is based on MSP430F5528. The microcontroller is
preloaded with firmware that enables its use as a USB-to-I2C converter. Push button SW1 and
unpopulated pin hole header J2 are available for BSL and SBW programming, respectively. However, the
included firmware is necessary for correct operation of the EVM-GUI software.
3.2.2 USB-to-I2C Converter 3.3-V Regulator
Use switch S1 to disable the onboard 3.3-V regulator. This regulator powers the TMP468 through the test
point on the back of the EVM labeled 3.3 V. When the regulator is disabled, the 3.3-V test point can be
connected to an external source between 1.7 V to 3.6 V. LED D2 indicates power to the 3.3-V test point,
and thus power to the TMP468.
3.2.3 USB-to-I2C Converter THERM Indicators
LEDs D4 and D5 indicate the status of the TMP468 THERM and THERM2 pin holes, respectively. These
LEDs are driven by an inverter, therefore the LEDs illuminate when a THERM event is asserted by the
TMP468.

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3.2.4 TMP468 Serial Bus Address
The TMP468 can be configured for one of four serial bus addresses depending on the state of the ADD
pin hole, as shown in Table 3. The EVM ships with resistor R9 populated by a 0-Ωresistor, shown in
Figure 7. This R9 resistor sets the default address of the EVM to 48h (hex).
Table 3. TMP468 Slave Address Options
CORRESPONDING
EVM RESISTOR ADD PIN HOLE CONNECTION SLAVE ADDRESS
BINARY HEX
R9 GND 1001000 48
R10 V+ 1001001 49
R11 SDA 1001010 4A
R12 SCL 1001011 4B
Figure 7. EVM Address Pin Hole Connections
3.2.5 Shunt Resistor
Shunt resistor R13 connects directly to the TMP468 device. R13 can be removed or replaced in order to
directly measure the current consumption of the TMP468 device.
3.2.6 RC Filter
Each remote channel features an RC Filter. Resistors R1 through R8 and capacitors C1 through C8
comprise the RC filter for each respective channel.
3.2.7 Remote Junction Transistors
The EVM features eight MMBT3904LP transistors for use as remote temperature sensors. Each transistor
is perforated so that it can be separated from the EVM, as shown in Figure 8. The schematic connections
for each transistor section is shown in Figure 9.
Figure 8. Remote Junction Transistors
Figure 9. Connection for NPN Transistors Q1 to Q8

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4 TMP468EVM Software Overview
This section discusses how to install the EVM software.
4.1 TMP468EVM Software Installation
The EVM software is tested on both the Microsoft Windows 7 and 10 operating system (OS). The software
also functions on other Windows operating systems. The EVM software is available through the EVM
product folder on the TI website through the hyperlink. The hyperlink will redirect to the TI Cloud where a
common repository of all published applications using GUI Composer framework. The applications can run
directly from the Gallery with minimal install, or can be downloaded from the Gallery with runtime to run on
a desktop local machine. The applications is supported to use on many platforms (web, Windows, Linux,
OSX); however, Linux and OSX might require additional drivers. To download the software to your
system, follow the instructions below.
4.1.1 Running GUI Online
Go to the TMP468EVM web page on the TI website: http://www.ti.com/tool/TMP468EVM. Scroll down to
the “Software” section and click on the hyperlink to download the latest evaluation software, or go to
http://dev.ti.com/gallery/ for a direct link to the Gallery. It might require login user account privileges to use
the online version, as well as the installation of the applications. On the top-middle of the Gallery main
page, navigate to the search box and type TMP468EVM GUI as shown in Figure 10.
Figure 10. Gallery Home Page

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Click on the TMP468EVM GUI icon. Users may be prompted to download and install the browser
extensions for Firefox or Chrome, and the TI Cloud Agent Application for the first time. Click on Agree and
Proceed. After this, the TMP468GUI should launch in your browser window.
Figure 11. Cookies Agreement

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4.1.2 Running GUI on Desktop
In the TMP468EVM GUI icon, click on the download icon to download the
TMP468EVM_GUI_installer_win.zip. When the pop-up screen appears, select the desired platform to
install into your local machine as shown in Figure 12.
Figure 12. TMP468EVM GUI Download From the Gallery

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Unzip the downloaded file into a known directory, and run the “TMP468EVM_GUI-
1.0.0.setupwin_7.2.0.exe” file located in [Unzipped location]. The EVM software installer then begins the
installation process. Follow the on-screen instructions by clicking the “Next” button to install the GUI
Composer runtime engine. If it is the first-time installation, the TMP468EVM GUI requires the GUI
Composer runtime engine v7.2 to operate properly.
Figure 13. GUI Composer Runtime Wizard
Read through the License Agreement, click the checkbox if you agree, and click "Next".
Figure 14. TMP468EVM GUI License Agreement

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Click on the "Next" button to accept the default installation directory. Installation takes some time to
complete.
Figure 15. GUI Composer Installation Directory
Click "Next" to start the installation.
Figure 16. Ready to Install

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The TMP468EVM GUI will start to install as shown in Figure 17
Figure 17. Installing GUI Composer Runtime
Figure 18. TMP468EVM Installation Finish
Read the readme file and close it out after you are done. If you choose to Launch TMP468_GUI, it should
launch shortly after closing the readme file.
4.2 Using the TMP468EVM Software
4.2.1 Launching and Running the Software
The TMP468EVM GUI can be run from TI Cloud repository (http://dev.ti.com/gallery/) from the Firefox or
Chrome browser, or from Windows desktop offline. Start the launch by connecting the TMP468EVM to a
USB port on a PC.
Launch the TMP468EVM software by clicking on the TMP468EVM GUI icon in the Gallery or the Windows
offline app. The TMP468EVM GUI should automatically initialize and connect to the HID port. A successful
connection will show “HARDWARE CONNECTED” on the bottom of the GUI status indicator. If there is a
connection problem, verify if the TMP468EVM has an established connection with the PC. If the GUI failed
to connect, the status indicator shows as “HARDWARE NOT CONNECTED”.

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Once connected to the GUI, the software will change the default settings of the N-Factor Correction and
will unlock the registers for user convenience. If the user tries to write to the device while the register map
is locked, the device will send a NACK which will disconnect the device from the GUI. The software
updates the N-Factor to more closely reflect the N-Factor of the transistors on the EVM. Further
adjustments to the N-Factor correction register may be needed as N-factor of the transistors can vary.
4.2.2 Home Tab
When the TMP468EVM GUI is launched, the Home tab will be selected and shown by default. Uou can
navigate to any one of the other five tabs on this page. On the left, you will see the tab bar that will be
available on every tab in the GUI. Clicking on a tab icon will bring you to the respective tab. On the
bottom, you will see the same list of icons with a short description of each of the tabs. Similarly to the tab
bar icons, these icons will also bring you to the respective tab.
Figure 19. TMP468EVM Home Tab

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4.2.3 Quick Start Tab
The Quick Start Tab is used to guide the user through the basic settings of the TMP468EVM. The user
can choose to either use default settings or be guided through the setup. Choosing to use default settings
will take you straight to the Data Capture Tab. After choosing default settings, the user can always go
back to the Quick Start Tab and choose to be guided through the setup or change the device settings in
the Basic Settings Tab.
Figure 20. TMP468EVM Quick Start Tab

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If you choose to be guided through the setup, you will see a page that will make sure the TMP468EVM is
connected correctly. Select the I2C address that correlates to in which the ADD pin is set. If it is
connected correctly, click the "YES" button and a list of high-level settings to configure will appear as seen
in Figure 22.
Figure 21. Quick Start Connection Check

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Figure 22. Quick Start Guide
At the bottom of these settings, you will see a choice to go to the Basic Settings tab where a more
extensive list of settings will be, or go to the Data Capture tab.

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4.2.4 Basic Settings Tab
The Basic Settings tab is where all the device settings along with I2C settings are configured.
Figure 23. TMP468EVM Basic Settings Tab
4.2.4.1 I2C Configuration
I2C Frequency: this drop-down sets the I2C clock frequency to either 100 kbps or 400 kbps
I2C Address: this displays the I2C address of the TMP468
Software Reset: clicking this push button will send a software reset to the device
Register Lock: this toggle switch will lock or unlock the registers
4.2.4.2 Device Configuration
Shutdown: setting this checkbox will place the device into shutdown mode
Conversion per second: this slider will set how many temperature conversions the TMP468 will perform
per second
THERM Hysteresis: this slider will set the THERM hysteresis value
4.2.4.3 Channel Configuration
The TMP468EVM has one local channel and eight remote channels. The Channel Configuration section is
where the settings for specific channels can be configured.
4.2.4.3.1 Local
Temperature Reading: displays the temperature of the channel
THERM Limit: this slider sets the THERM limit threshold
THERM2 Limit: this slider sets the THERM2 limit threshold
Enable: this checkbox will enable this channel to calculate new temperature data during a conversion
cycle

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4.2.4.3.2 Remote1-8
Temperature Reading: displays the temperature of the channel
THERM Limit: this slider sets the THERM limit threshold
THERM2 Limit: this slider sets the THERM2 limit threshold
Remote Offset: this number spinner will set the temperature offset of the remote channel temperature
reading
N-Factor Correction: this number spinner is used to adjust for the N-factor of the remote BJT. Set this
spinner to the N-factor of the remote BJT that is connected to the TMP468EVM
Enable: this checkbox will enable this channel to calculate new temperature data during a conversion
cycle
4.2.5 Data Capture Tab
The Data Capture Tab is where the temperature readings as well as the set temperature thresholds will be
graphed.
Figure 24. TMP468EVM Basic Settings Tab
In the bottom-left of the Data Capture tab, there is a list of some device configurations that are also found
on the Basic Settings tab with the addition of the "SEND ONE SHOT" button. This button will enable only
when the conversion mode is set to "Shutdown." When this button is clicked, a One Shot command will be
sent to the device and a single temperature conversion will be done.

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At the bottom-right of the Data Capture tab, there are the GUI settings. These settings change how the
GUI will handle the data collected from the TMP468EVM.
Channels to Graph: these checkboxes enable and disable specific channels as well as hide the
respective graph
Temperature Scale: this radio button group sets the units the temperature information is displayed
Show Threshold Sliders: setting this check box will show the threshold sliders to the right of the graph as
well as displays for the temperature readings
Figure 25. Threshold Sliders
Graph: this is where the temperature data and thresholds are plotted. Clicking on the traces in the legend
at the top-right will hide/show different traces. Hovering over the graph will display different point
information, and other feature icons will appear at the top-right.
Data to Plot: this drop-down determines which data is plotted on the graph
Samples to Plot: this drop-down sets how many samples are plotted on the graph
Refresh Rate: this drop-down sets the desired time frame to fetch the register data. This is directly tied to
the Auto-read drop-down on the Register Tab
Save Data: clicking this button will save the plotted data into an .csv file
Clear Data: clicking this button will clear all the data that is plotted on the graph

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4.2.6 Register Tab
The Register Map page shown in Figure 26 allows low-level access to all the I2C registers of the TMP468
device. Clicking on the question mark to the right of the Register Name will bring up an extraction short
version from the data sheet describing that register. Clicking on a specific Register Name will populate the
Field View to on the right side of the screen. The Field View describes each bit field within that register.
The “Registers” tab provides access to the registers raw data of the TMP468. Changes to the basic
settings page are mirrored here, and vice versa.
Figure 26. TMP468EVM Register Tab
Read Registers: performs a single read for the selected register.
Read All Registers: performs a read for all registers contents.
Auto Read: allows the user to set the desired time frame to fetch the register data.