Texas Instruments TMP451EVM User manual

TMP451EVM User’s Guide and Software
Tutorial
User's Guide
Literature Number: SBOU131
June 2013

Contents
1 Overview ............................................................................................................................ 5
1.1 TMP451EVM Kit Contents ................................................................................................. 5
1.2 Related Documentation from Texas Instruments ....................................................................... 6
2 TMP451EVM Hardware Setup ................................................................................................ 7
2.1 Theory of Operation for TMP451 Hardware ............................................................................. 7
2.2 Signal Definitions of H1 (10-Pin Male Connector Socket) ............................................................. 7
2.3 Theory of Operation for USB DIG Platform .............................................................................. 8
3 TMP451EVM Hardware Overview ........................................................................................... 9
3.1 Connecting the Hardware .................................................................................................. 9
3.2 Connecting the USB Cable to the DIG ................................................................................... 9
3.2.1 Optional 10-pin Connector Ribbon Extender ................................................................. 10
3.3 TMP451EVM Features ................................................................................................... 10
3.3.1 I2C Translator and Test Points ................................................................................. 10
3.3.2 Remote Temperature Terminal Block, J4 ..................................................................... 10
4 TMP451EVM Software Setup ............................................................................................... 12
4.1 Operating Systems for TMP451EVM Software ........................................................................ 12
4.2 TMP451EVM Software Installation ...................................................................................... 12
5 TMP451EVM Software Overview .......................................................................................... 15
5.1 Starting the TMP451EVM Software ..................................................................................... 15
5.2 Using the TMP451EVM Software ....................................................................................... 16
5.2.1 Reading from Registers .......................................................................................... 16
5.2.2 Temperature ALERT and THERM Limits ..................................................................... 16
5.2.3 Configuration Register Tab ...................................................................................... 17
5.2.4 Conversion Rate Register Tab .................................................................................. 18
5.2.5 n-Factor Correction Tab ......................................................................................... 18
5.2.6 Reading the Temperature Gauge .............................................................................. 19
6 TMP451EVM Documentation ............................................................................................... 20
6.1 TMP451EVM Board Schematic .......................................................................................... 20
6.2 TMP451EVM PCB Components Layout ................................................................................ 21
6.3 TMP451 Test Board Bill of Materials ................................................................................... 22
2Contents SBOU131–June 2013
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List of Figures
1-1. Hardware Included with TMP451EVM Kit ............................................................................... 6
2-1. TMP451EVM Hardware Setup............................................................................................ 7
2-2. TMP451EVM Test Board Block Diagram................................................................................ 7
2-3. USB DIG Platform Block Diagram........................................................................................ 8
3-1. Connecting SM-USB-DIG Platform....................................................................................... 9
3-2. Confirmation of SM-USB-DIG Platform Driver Installation........................................................... 10
3-3. 10-Pin Ribbon Cable Extender .......................................................................................... 10
3-4. Connection for NPN Transistor to J4 ................................................................................... 11
3-5. Remote NPN Setup ....................................................................................................... 11
4-1. TMP451EVM Software Install Window ................................................................................. 13
4-2. TMP451EVM License Agreements ..................................................................................... 14
5-1. TMP451EVM Software Interface ........................................................................................ 15
5-2. Communication Error with USB DIG Platform......................................................................... 16
5-3. TMP451 Read Continuously ............................................................................................. 16
5-4. Temperature Limits Tab .................................................................................................. 17
5-5. TMP451 Configuration Register......................................................................................... 18
5-6. Reading the Temperature Gauge ....................................................................................... 19
6-1. TMP451EVM Board Schematic ......................................................................................... 20
6-2. TMP451EVM Components Layout...................................................................................... 21
List of Tables
1-1. Contents of TMP451EVM Kit.............................................................................................. 5
1-2. Related Documentation .................................................................................................... 6
2-1. Pin Connector ............................................................................................................... 8
5-1. Conversion Rate Register Codes ....................................................................................... 18
5-2. n-Factor Correction Register Codes .................................................................................... 19
6-1. TMP451EVM Test Board Bill of Materials ............................................................................. 22
3
SBOU131–June 2013 List of Figures
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This user's guide describes the characteristics, operation, and use of the TMP451EVM evaluation board. It
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 TMP451EVM. This user's guide also includes information regarding
operating procedures and input/output connections, an electrical schematic, PCB layout drawings, and a
parts list for the EVM.
Windows, Windows XP, WinZIP are registered trademarks of Microsoft Corporation.
I2C is a trademark of NXP Semiconductor Corp..
4List of Tables SBOU131–June 2013
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Chapter 1
SBOU131–June 2013
Overview
The TMP451 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, or on-die transistor or diode structures that are an integral part of microprocessors,
microcontrollers, or FPGAs. The temperature accuracy is ±1°C for the local and the remote temperature
sensors. The two-wire serial interface accepts SMBus communication protocol.
1.1 TMP451EVM Kit Contents
Table 1-1 details the contents of the TMP451EVM kit, and Figure 1-1 below shows 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 1-1. Contents of TMP451EVM Kit
Item Quantity
TMP451 PCB Test Board 1
NPN 2N2222 Transistor 1
USB SM-DIG Platform PCB 1
USB Cable Extender 1
10-pin Connector Ribbon Cable Extender 1
User’s Guide CD 1
5
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Related Documentation from Texas Instruments www.ti.com
Figure 1-1. Hardware Included with TMP451EVM Kit
1.2 Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the TMP451EVM. This user's guide is available from the TI website under literature number
SBOU131. 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
http://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 1-2. Related Documentation
Document Literature Number
TMP451 Product Data Sheet
USB SM-DIG Platform User’s Guide SBOU098
6Overview SBOU131–June 2013
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Chapter 2
SBOU131–June 2013
TMP451EVM Hardware Setup
The TMP451EVM hardware consists of the SM-USB-DIG and TMP451EVM; these are easily connected
through a 10 pin board-to-board connector that should be attached to the SM-USB-DIG and TMP451EVM
PCBs. Once these two boards are connected, simply plug the USB device from the SM-USB-DIG into the
computer as shown in Figure 2-1.
Figure 2-1. TMP451EVM Hardware Setup
2.1 Theory of Operation for TMP451 Hardware
The TMP451EVM only requires the two-wire I2C™ lines (SDA and SCLK) and VDUT/GND to supply a
constant 3.3 V and power return as shown in Figure 2-2. The TMP451EVM also has test points to monitor
these signal lines, and ground in case the user may want to use their own signals or verify I2C
communications.
Figure 2-2. TMP451EVM Test Board Block Diagram
2.2 Signal Definitions of H1 (10-Pin Male Connector Socket)
Table 2-1 shows the pin out for the 10-Pin connector socket used to communicate between the
TMP451EVM and the SM-DIG. It should be noted that the TMP451EVM only uses the necessary I2C
communication lines (pins 1 and 3) and the VDUT and GND (pin 6 and 8) pins to issue commands to the
TMP451 sensors.
7
SBOU131–June 2013 TMP451EVM Hardware Setup
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TUSB3210
8052 uC
w/ USB Interface
and UART
USB Bus from
Computer
3.3V Regulator
+3.3V
USB
+5.0V
8Kx8 Byte
EEPROM
Buffers and
Level
Translators
Power
Switching
Vdut
(Hi-Z, 3.3V or 5V) Switched Power
I2C
SPI
Control Bits
Measure Bits
Power on Reset
SM-USB-DIG
To Test Board
To Computer and Power Supplies
+3.3V
USB +5.0V
Theory of Operation for USB DIG Platform www.ti.com
Table 2-1. Pin Connector
PIN Signal Description
On
U1
1 I2C_SCL I2C Clock Signal (SCL)
2 CTRL/MEAS4 GPIO – Control Output or Measure Input
3 I2C_SDA1 I2C Data Signal (SDA)
4 CTRL/MEAS5 GPIO – Control Output or Measure Input
5 SPI_DOUT1 SPI Data Output (MOSI)
6 VDUT Switchable DUT Power Supply: 3.3 V, 5 V, Hi-Z (Disconnected).(1)
7 SPI_CLK SPI Clock Signal (SCLK)
8 GND Power Return (GND)
9 SPI_CS1 SPI Chip Select Signal (/CS)
10 SPI_DIN1 SPI Data Input (MISO)
(1) When VDUT is Hi-Z all Digital I/O are Hi-Z as well.
2.3 Theory of Operation for USB DIG Platform
Figure 2-3 shows the block diagram for the SM-USB-DIG platform. This platform is a general purpose data
acquisition system that is used on several different Texas Instruments evaluation modules. The details of
its operation are included in a separate document. The block diagram shown in Figure 2-3 is given as a
brief overview of the platform.
The brain of the SM-USB-DIG Platform is the TUSB3210. The TUSB3210 is an 8052 microcontroller that
has a built in USB interface. The microcontroller receives information from the host computer that it
interprets into power, I2C, SPI, and other digital I/O patterns. During the digital I/O transaction, the
microcontroller reads the response of any device connected to the I/O interface. The response from the
device is sent back to the PC where it is interpreted by the host computer.
Figure 2-3. USB DIG Platform Block Diagram
8TMP451EVM Hardware Setup SBOU131–June 2013
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Chapter 3
SBOU131–June 2013
TMP451EVM Hardware Overview
WARNING
Many of the components on the TMP451EVM 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 Hardware
To connect the TMP451EVM and the SM-USB-DIG Platform together, gently slide the male and female
ends of the 10-pin connectors together. Make sure that the two connectors are completely pushed
together; loose connections may cause intermittent operation.
3.2 Connecting the USB Cable to the DIG
Figure 3-1 shows the typical response to connecting the SM-USB-DIG platform 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 likely changes to Found New Hardware, USB Human Interface Device.
This pop-up indicates that the device is ready to be used. The SM-USB-DIG platform uses the human
interface device drivers that are part of the Microsoft Windows®operating system.
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 3-2.
Figure 3-1. Connecting SM-USB-DIG Platform
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TMP451EVM Features www.ti.com
Figure 3-2. Confirmation of SM-USB-DIG Platform Driver Installation
3.2.1 Optional 10-pin Connector Ribbon Extender
The TMP451EVM kit is shipped with an optional ribbon cable for extending the connection between the
SM-USB-DIG and the PCB. This can be useful if high temperature tests need to be run on the test board,
since the SM-USB-DIG is not rated for high temperatures. To connect the ribbon cable, attach the cable to
the EVM and SM-USB-DIG as shown in Figure 3-3.
Figure 3-3. 10-Pin Ribbon Cable Extender
3.3 TMP451EVM Features
This section describes some of the hardware features present on the TMP451EVM.
3.3.1 I2C Translator and Test Points
One of the features of the TMP451 is the ability of the part to be powered at 1.8 V while the
communication is still at 3.3 V. The TMP451EVM is equipped with an on board I2C level translator. This
allows the TMP451 and the I2C to be operated at 3.3 V or 1.8 V by shunting 3.3 V or 1.8 V on J3 and J2.
The I2C test points SDAB and SCLB are connected to the I2C line of the SM-USB-DIG and run to the input
of the level translator, U2. The I2C test points SDAA and SCLA are connected to the output of the level
translator, U2, and run to the clock and data lines of the TMP451.
3.3.2 Remote Temperature Terminal Block, J4
The TMP451EVM has a terminal block, J4, used for attaching a remote temperature sensor, in this case a
NPN transistor which is included in the kit. To connect the transistor, attach the base and collector to D+
and the emitter to D- as shown in Figure 3-4.
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D+ D- GND
B
E
C
www.ti.com TMP451EVM Features
Figure 3-4. Connection for NPN Transistor to J4
Figure 3-5. Remote NPN Setup
11
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Chapter 4
SBOU131–June 2013
TMP451EVM Software Setup
This section discusses how to install the TMP451EVM software.
4.1 Operating Systems for TMP451EVM Software
The TMP451EVM software has been tested on the Microsoft Windows XP®operating system (OS) with
United States and European regional settings. The software should also function on other Windows
operating systems.
4.2 TMP451EVM Software Installation
The TMP451EVM software is included on the CD that is shipped with the EVM kit. It is also available
through the TMP451EVM product folder on the TI website. To download the software to your system,
insert the disc into an available CD-ROM drive. Navigate to the drive contents and open the TMP451EVM
software folder. Locate the compressed file (TMP451EVM.zip) and open it. Using WinZIP®or a similar file
compression program; extract the TMP451EVM files into a specific TMP451EVM folder (for example,
C:\TMP451\TMP451EVM) on your hard drive.
Once the files are extracted, navigate to the TMP451EVM folder you created on your hard drive. Locate
the setup.exe file and execute it to start the installation. The TMP451 software installer should begin the
installation process as shown in Figure 4-1.
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www.ti.com TMP451EVM Software Installation
Figure 4-1. TMP451EVM Software Install Window
After the install initializes the user is given the choice of selecting the directory to install the program,
usually defaulting to C:\Program Files\TMP451EVM and C:\Program Files\National Instruments. Following
this option, two license agreements are presented that must be accepted as shown in Figure 4-2. After
accepting the Texas Instruments and National Instruments license agreements, the progress bar opens
and shows the installation of the software. Once the installation process is completed click Finish.
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TMP451EVM Software Installation www.ti.com
Figure 4-2. TMP451EVM License Agreements
14 TMP451EVM Software Setup SBOU131–June 2013
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Chapter 5
SBOU131–June 2013
TMP451EVM Software Overview
This section discusses how to use the TMP451EVM software.
5.1 Starting the TMP451EVM Software
The TMP451EVM software can be operated through the Start menu in Windows. From the Start menu,
select All Programs, highlight the TMP451 folder, and then select the TMP451EVM program. Figure 5-1
illustrates how the software should appear if the TMP451EVM is functioning properly.
Figure 5-1. TMP451EVM Software Interface
Figure 5-2 shows an error that pops up if the computer cannot communicate with the EVM. In the event
you receive this error, first ensure that the USB cable is properly connected on both ends. Another
possible source for this error is a problem with the USB human interface device driver of the computer.
Make sure that the device is recognized when the USB cable is plugged in, as indicated by a Windows-
generated confirmation sound.
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Using the TMP451EVM Software www.ti.com
Figure 5-2. Communication Error with USB DIG Platform
5.2 Using the TMP451EVM Software
5.2.1 Reading from Registers
When first starting the TMP451EVM software, it is advised that the user confirm connections to the board
by toggling the Read Continuously button shown in Figure 5-3. If all devices are communicating correctly,
the user should be able to see temperature change over time in the TMP451 local temperature box.
Figure 5-3. TMP451 Read Continuously
5.2.2 Temperature ALERT and THERM Limits
The first tab on the TMP451EVM software is Temperature Limits. In this tab you can read or set the
ALERT and THERM limits for the TMP451. You can also set a temperature offset for the remote
temperature sensor and enable a THERM hysteresis. Changing values in these controls automatically
writes them. The Temperature Limits tab is shown in Figure 5-4.
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www.ti.com Using the TMP451EVM Software
Figure 5-4. Temperature Limits Tab
5.2.3 Configuration Register Tab
The TMP451EVM software contains a tab for the configuration register, consecutive alert register, and
status register. Changing values in this register automatically writes them. In the Configuration register the
bit MASK1 masks the ALERT pin when enabled. R/S stands for RUN/STOP, when enabled this sets the
TMP451 to standby. AL/TH stands for ALERT/THERM2. When this bit is enabled ALERT becomes a
second THERM. The TRange bit switches the TMP451 from its normal temperature range of 0°C–127°C
to its extended temperature range of –64°C–191°C. For the Consecutive Alert register the bit SMBus
enables a 30-ms timeout while bits 1–3 determine how many out-of-limit measurements are needed to
trigger an ALERT. Figure 5-5 shows the Configuration Register tab in the TMP451EVM software. See the
data sheet for more information.
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Figure 5-5. TMP451 Configuration Register
5.2.4 Conversion Rate Register Tab
The Conversion Rate Register tab contains both the Conversion Rate register and the Digital Filter Control
register. Changing values in these registers automatically writes them. Table 5-1 shows the conversion
rate register codes. For the Digital Filter register there are three options, Disabled (default), Level 1, and
Level 2. This filter maintains a running average of 4 samples (level 1) or 8 samples (level 2).
Table 5-1. Conversion Rate Register Codes
Code Conversion/Second Time (Second)
0x00 0.0625 16
0x01 0.125 8
0x02 0.25 4
0x03 0.5 2
0x04 1 1
0x05 2 500 m
0x06 4 250 m
0x07 8 125 m
0x08 16 62.5 m
0x09 32 31.25 m
5.2.5 n-Factor Correction Tab
The TMP451 allows for a different n-factor value for converting remote channel measurements to
temperature. Table 5-2 shows the n-factor correction register codes.
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Table 5-2. n-Factor Correction Register Codes
Binary Hex Decimal N
01111111 7F 127 1.747977
00001010 0A 10 1.042759
00001000 08 8 1.035616
00000110 06 6 1.028571
00000100 04 4 1.021622
00000010 02 2 1.014765
00000001 01 1 1.011371
00000000 00 0 1.008
11111111 FF –1 1.004651
11111110 FE –2 1.001325
11111100 FC –4 0.994737
11111010 FA –6 0.988235
11111000 F8 –8 0.981818
11110110 F6 –10 0.975484
10000000 80 –128 0.706542
5.2.6 Reading the Temperature Gauge
The temperature box on the TMP451EVM software displays the measured values of the TMP451 device
Local Temperature and External Temperature registers in a graphical format as shown in Figure 5-6.
These values are displayed in Celsius. A continuous reading can be displayed by toggling the Read
Continuously control.
Figure 5-6. Reading the Temperature Gauge
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1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
1 1Complete Schematic
3/20/2013
TMP451EVM_SCH.SchDoc
Sheet Title:
Size: Schematic:
Mod. Date:
File:
Rev:
Sheet: of
B
Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this
specification or any information contained therein.Texas Instruments and/or its licensors do not
warrant that this design will meet the specifications, will be suitable for your application or fit for
any particular purpose, or will operate in an implementation. Texas Instruments and/or its
licensors do not warrant that the design is production worthy. You should completely validate
and test your design implementation to confirm thesystem functionality for your application. http://www.ti.com
Contact: http://www.ti.com/support
EVMProject:
Designed for:PA-Linear
870 0
Assembly Variant:Variant name not interpreted
© Texas Instruments 2013
LOGO
PCB
Texas Instruments
I2C_SCL
I/O 4
I2C_SDA
I/O 5
SPI_MOSI
VDUT
SPI_CLK
GND
SPI_CS
SPI_MISO
J1
851-43-010-20-001000
IN
GND
EN
OUT
FB
TPS79918
IN
GND
EN
OUT
FB
TPS79918
U3
296-17778-6-ND
Vcca
SCLA
SDAA
GNDEN
SDAB
SCLB
Vccb
PCA9517DR
Vcca
SCLA
SDAA
GNDEN
SDAB
SCLB
Vccb
PCA9517DR
U2
296-23734-1-ND
TLV3012AIDBVR
1
2
3
-
+
4
6
5
U6
TLV3012AIDBVR
1
2
3
-
+
4
6
5
U7
ALERT
GND
GND
GND
GND
VCC
VCC
VCC
845
R13
845
R10
845
R11
0.1µF
C7
0.1µF
C8
GNDGND
GND
D1
Red_LED
D5
Red_LED
D4
Green_LED
V+
1
D+
2
D-
3
THERM
5
SCL 8
SDA 7
ALERT 6
GND 5
TMP451
U1TMP451
VCC
VCC
VCC
GND
VCC
GND
VCC
10.0k
R3
10.0k
R4
0.1µF
C1
2.2µF
C2
GND GND
1 2 3
J3
0.1µF
C3
GND
GND
10.0k
R6
10.0k
R7
1 2 3
J2
VCC
GND
10.0k
R5
ALERT
TLV3012AIDBVR
1
2
3
-
+
4
6
5
U4
TLV3012AIDBVR
1
2
3
-
+
4
6
5
U5
THERM
GND
GND
GND
GND
VCC
VCC
845
R8
845
R9
0.1µF
C5
0.1µF
C6
GNDGND
GND
D3
Red_LED
D2
Green_LED
THERM
GND
GND
VCC_3.3
D-
1
2
3
J4
0
R1
0
R2
0.1µF
C4
GNDGND
VCC_1.8
D+
SDAB
SCLB
SDAA
SCLA
THERM
ALERT
H1
SJ61A1
H2
SJ61A1
H3
SJ61A1
H4
SJ61A1
Chapter 6
SBOU131–June 2013
TMP451EVM Documentation
This section contains the complete bill of materials and schematic diagram for the TMP451EVM.
Documentation information for the SM-USB-DIG platform can be found in the SM-USB-DIG platform
User’s Guide, SBOU098, available at the TI website at http://www.ti.com.
6.1 TMP451EVM Board Schematic
Figure 6-1 shows the schematic for the TMP451EVM board.
Figure 6-1. TMP451EVM Board Schematic
20 TMP451EVM Documentation SBOU131–June 2013
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