Texas Instruments TPL1401 User manual

User’s Guide
TPL1401 Evaluation Module
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the TPL1401EVM evaluation module
(EVM). This EVM is designed to evaluate the performance of the TPL1401 buffered voltage output DAC in a
variety of configurations. Throughout this document, the terms evaluation board, evaluation module, and EVM
are synonymous with the TPL1401EVM. This document includes a schematic, reference printed-circuit board
(PCB) layouts, and a complete bill of materials.
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Table of Contents
1 Overview..................................................................................................................................................................................4
1.1 Kit Contents........................................................................................................................................................................4
1.2 Related Documentation from Texas Instruments............................................................................................................... 4
2 System Setup.......................................................................................................................................................................... 5
2.1 Software Setup...................................................................................................................................................................5
2.2 Hardware Setup................................................................................................................................................................. 8
3 Detailed Description............................................................................................................................................................. 10
3.1 Hardware Description.......................................................................................................................................................10
3.2 Software Description........................................................................................................................................................ 16
4 Schematic, PCB Layout, and Bill of Materials................................................................................................................... 21
4.1 BOOSTXL-DAC-PORT Schematic...................................................................................................................................22
4.2 TPL1401EVM Schematic................................................................................................................................................. 24
4.3 PCB Components Layout.................................................................................................................................................25
4.4 BOOSTXL-DAC-PORT Bill of Materials...........................................................................................................................28
4.5 TPL1401EVM Bill of Materials......................................................................................................................................... 30
List of Figures
Figure 2-1. TPL1401EVM Software Setup.................................................................................................................................. 5
Figure 2-2. Software Installation Path..........................................................................................................................................6
Figure 2-3. TI Cloud Agent Installation........................................................................................................................................ 7
Figure 2-4. Analog EVM Controller Setup................................................................................................................................... 7
Figure 2-5. Hardware Setup........................................................................................................................................................ 8
Figure 2-6. Hardware Setup Guidelines...................................................................................................................................... 9
Figure 3-1. BOOSTXL-DAC-PORT Hardware Block Diagram...................................................................................................10
Figure 3-2. TPL1401EVM Hardware Block Diagram................................................................................................................. 14
Figure 3-3. TPL1401EVM GUI Location.................................................................................................................................... 16
Figure 3-4. TPL1401EVM GUI Connection Detection............................................................................................................... 17
Figure 3-5. TPL1401EVM Software Home Page.......................................................................................................................17
Figure 3-6. TPL1401EVM Setup Page...................................................................................................................................... 18
Figure 3-7. TPL1401EVM Quick-Start Page : Basic DPOT Configuration................................................................................ 19
Figure 3-8. Register Map Page..................................................................................................................................................20
Figure 3-9. Register Page Options............................................................................................................................................ 20
Figure 3-10. Collateral Page......................................................................................................................................................21
Figure 4-1. BOOSTXL-DAC-PORT Schematic Page 1............................................................................................................. 22
Figure 4-2. BOOSTXL-DAC-PORT Schematic Page 2............................................................................................................. 23
Figure 4-3. TPL1401EVM Schematic........................................................................................................................................ 24
Figure 4-4. BOOSTXL-DAC-PORT PCB Components Layout..................................................................................................25
Figure 4-5. BOOSTXL-DAC-PORT Top Layer...........................................................................................................................25
Figure 4-6. BOOSTXL-DAC-PORT Bottom Layer..................................................................................................................... 26
Figure 4-7. TPL1401EVM PCB Components Layout................................................................................................................ 26
Figure 4-8. TPL1401EVM Layers.............................................................................................................................................. 27
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List of Tables
Table 1-1. Contents of TPL1401EVM Kit..................................................................................................................................... 4
Table 1-2. Required Components Not Included With Kit............................................................................................................. 4
Table 1-3. Related Documentation.............................................................................................................................................. 4
Table 2-1. TPL1401EVM Power Supply Inputs............................................................................................................................8
Table 2-2. BOOSTXL-DAC-PORT Jumper Settings.................................................................................................................... 9
Table 3-1. BOOSTXL-DAC-PORT J13 Pin Definitions...............................................................................................................11
Table 3-2. BOOSTXL-DAC-PORT J14 Pin Definitions...............................................................................................................11
Table 3-3. BOOSTXL-DAC-PORT J4 Pin Definitions................................................................................................................ 12
Table 3-4. BOOSTXL-DAC-PORT J5 Pin Definitions................................................................................................................ 12
Table 3-5. BOOSTXL-DAC-PORT J12 Pin Definitions.............................................................................................................. 13
Table 3-6. TPL1401EVM J2 Pin Definitions...............................................................................................................................15
Table 3-7. TPL1401EVM J1 Pin Definitions...............................................................................................................................15
Table 4-1. BOOSTXL-DAC-PORT Bill of Materials....................................................................................................................28
Table 4-2. TPL1401EVM Bill of Materials.................................................................................................................................. 30
Trademarks
Launchpad™ is a trademark of Texas Instruments.
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
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1 Overview
The TPL1401EVM is an easy-to-use platform to evaluate the functionality and performance of the TPL1401
device. The TPL1401 is a digital potentiometer (DPOT) with buffered wiper. The buffered wiper isolates the
resistor string from the output load impedance making the TPL1401 an excellent choice for voltage divider and
analog setpoint applications. The TPL1401 consumes very low power and is available in a tiny 8- pin WSON
package. The NVM also supports 2 bytes of user data storage for storing configuration revision data or
calibration settings of companion devices. The DPOT uses the power supply as the voltage reference, which can
operate between 1.8 V and 5.5 V. In this power supply range, the DPOT can be used as a programmable gain or
attenuation device. This device supports I2C standard mode, fast mode, and fast+ mode. The TPL1401 provides
the FB pin to configure the output as a programmable current sink using an external MOSFET. The TPL1401 is
simple to program using an I2C interface at factory or in real-time. An integrated nonvolatile memory (NVM)
enables factory programming for trimming and calibration applications. This makes the operation of the DPOT
processor-less. The EVM provides the GPIO and I2C programming interface using a PC-based graphical user
interface (GUI).
1.1 Kit Contents
Table 1-1 details the contents of the EVM kit. Contact the TI Product Information Center nearest you if any
component is missing. TI highly recommends that the user verify latest versions of the related software at the TI
website, www.ti.com.
Table 1-1. Contents of TPL1401EVM Kit
Item Quantity
TPL1401EVM evaluation board PCB 1
Table 1-2. Required Components Not Included With Kit
Item Quantity
BOOSTXL-DAC-PORT 1
MSP-EXP432E401Y Launchpad™
(Analog EVM Controller) 1
The Analog EVM Controller can be purchased from the MSP432E401Y tool folder on www.ti.com.
1.2 Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the TPL1401EVM. This user's guide is available from the TI web site under literature number
SLAU805. 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 web site 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 1-3. Related Documentation
Document Literature Number
TPL1401 product data sheet SNAS806
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2 System Setup
2.1 Software Setup
This section provides the procedure for EVM software installation.
2.1.1 Operating Systems
The EVM software is compatible with the Microsoft® Windows® 7, 8, and 10 operating systems.
2.1.2 Software Installation
The software is available on the product folder, and can also be found in the GUI Composer Gallery. Search for
TPL1401EVM inn the GUI Composer Gallery. Use the down arrow symbol to download the software. There are
two downloads: TPL1401EVM GUI and GUI Composer Runtime. Either download both, or just download the
EVM GUI; the runtime can be downloaded through the EVM GUI during installation. The software can also be
run online by clicking; however, only after the firmware and driver are upgraded. After the software is
downloaded onto the PC, navigate to the download folder, and run the TPL1401EVM software executable, as
shown in Figure 2-1. When the TPL1401EVM software is launched, an installation dialog window opens and
prompts the user to select an installation directory. If left unchanged, the software location defaults to
C:\Program Files (x86)\Texas Instruments\TPL1401 EVM as shown in Figure 2-2. If there is no previous
installation of the GUI Composer Runtime application, the installer also requests for an automatic download from
the web. Select either Install from Web to download and install from the web, or Install from PC and provide the
path to the local file that is already downloaded. The runtime also installs the USB drivers, unless the drivers are
already installed.
Figure 2-1. TPL1401EVM Software Setup
The software installation automatically copies the required files and drivers to the local machine.
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Figure 2-2. Software Installation Path
2.1.3 Analog EVM Controller Firmware Upgrade
The firmware for the Analog EVM Controller must be upgraded for the first time before using the software. A
jumper must be modified, and the USB cable must be connected to the XDS110 port of the Analog EVM
Controller to download firmware. The firmware can be programmed to the Analog EVM Controller using the
online tool UniFlash. This link is also provided on the Setup page of the GUI. The firmware bin file can be found
at <Download Directory>\TPL1401EVM_1.0.1_installer_win\install_image_TPL1401EVM\TPL1401EVM\firmware
\acctrl.0.3.0.3b.bin after unzipping the file install_image_TPL1401EVM.zip.
Follow the step-by-step procedure below to upgrade the firmware and install the device drivers successfully:
1. Remove jumper JP6 on the Analog EVM Controller as shown in step 1 of Figure 2-4.
2. Mount jumper on 5V-OTG. Retain the jumper on 5V-XDS as shown in step 1 of Figure 2-4.
3. Connect the USB cable to the port on the XDS110 side of the board as shown in step 2 of Figure 2-4.
4. Connect the USB cable to PC and open UniFlash. Click on Start Now in the Detect Device section.
5. If the GUI Composer framework is being installed for the first time on the PC, the browser extension and the
TI Cloud Agent must be installed. Follow the 2-step installation flow prompted on the web page, as shown in
Figure 2-3
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Figure 2-3. TI Cloud Agent Installation
6. Press the Refresh or Finish button after the installation is complete. This action should detect the Launchpad.
7. Press Start and browse for <Download Directory>\TPL1401EVM_1.0.1_installer_win
\install_image_TPL1401EVM.\TPL1401EVM\firmware\acctrl.0.3.0.3b.bin. Press Load Image followed by
Verify Image.
3 42
Remove
Jumper
Mount
Jumper
1
xxx
xxx
xxx
Figure 2-4. Analog EVM Controller Setup
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2.2 Hardware Setup
This section provides the overall system setup for the EVM. The hardware setup contains the Analog EVM
Controller (MSP-EXP432E401Y Launchpad), BOOSTXL-DAC-PORT, and TPL1401EVM. A PC runs software
that provides an interface to the TPL1401EVM through the Analog EVM Controller.
The Analog EVM Controller generates 5 V of power that can be used as VDD for the DAC. Analog EVM
Controller also generates 3.3 V of power that can be used for I2C pull-ups. The IO ports of the Analog EVM
Controller and level translators used on the BOOSTXL-DAC-PORT and TPL1401EVM can withstand a
maximum of 3.6-V IO levels. The Analog EVM Controller also generates digital signals used to communicate
with the EVM board.
The BOOSTXL-DAC-PORT is a generic platform used for catalog DACs that provides a predefined interface to
connect a DAC evaluation module. The BOOSTXL-DAC-PORT also provides various options for power supply,
reference, and digital signals. A connector is provided on the BOOSTXL-DAC-PORT for external power supplies.
This platform is designed to host additional boards stacked up on the BOOSTXL-DAC-PORT in order to provide
extended functions. Figure 2-5 displays the system setup.
XDS110
USB Port
Analog EVM
Controller
(MSP432E401Y)
BOOSTXL-DAC-PORT
Optional Function
Extender Card
OTG USB
Port (U7)
xx
xx
xx
xx
xx
xx
xxx
xxx
xxx
xxx
xxx
xxx
xxx
xxx
DAC EVM
Optional
Jumpers/Test
Points
Jumpers/Test Points
Figure 2-5. Hardware Setup
2.2.1 Power Configurations and Jumper Settings
The TPL1401EVM provides electrical connections to the device supply pins. The connectors and optional
configurations are shown in Table 2-1. The jumper settings on the BOOSTXL-DAC-PORT are crucial to the
proper functioning of the TPL1401EVM. Table 2-2 provides the details of the possible jumper settings on the
BOOSTXL-DAC-PORT.
Table 2-1. TPL1401EVM Power Supply Inputs
TPL1401EVM
Connector
Supply Name Voltage Range
J2.1 VDD 1.8 V to 5.5 V (5 V Available on Analog EVM Controller), Jumper J9.1-2 on BOOSTXL-DAC-PORT
J1.8 VIO 1.8 V to 3.6 V (3.3 V Available on Analog EVM Controller), Jumper J10.1-2 on BOOSTXL-DAC-PORT
J1.7 DAC_VIO 1.8 V to 3.6 V, Jumper J11.1-2 on BOOSTXL-DAC-PORT
J1.1 GND 0 V
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Table 2-2. BOOSTXL-DAC-PORT Jumper Settings
Jumper Default Position Available Option Description
J3 1-2: Onboard reference 2-3: External reference External or onboard reference selection
J6 2-3: Zener reference 1-2: VDD reference Zener or VDD reference
J7 2-3: 2.5-V reference 1-2: 5-V reference 2.5-V or 5-V reference selection
J8 2-3: Unused on TPL1401 1-2: Unused on TPL1401 External or onboard LDAC selection
J9 1-2: 5 V from Launchpad 2-3: External VDD 5-V or external VDD
J10 1-2: 3.3 V from Launchpad 2-3: External VIO 3.3-V or external VIO
J11 Closed: DAC_VIO is connected to VIO Open: DAC_VIO off DAC_VIO on/off
2.2.2 Connecting the Hardware
After the Analog EVM Controller firmware is upgraded as described in Section 2.1.3, and power and jumper
configurations done as per Section 2.2.1, the BOOSTXL-DAC-PORT and TPL1401EVM can be connected as
shown in Figure 2-6. Connect the USB cable from the Analog EVM Controller OTG USB Port (U7) to the PC.
Figure 2-6. Hardware Setup Guidelines
2.2.3 Electrostatic Discharge Warning
Many of the components on the TPL1401EVM are susceptible to damage by electrostatic discharge (ESD).
Observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a
grounded wrist strap at an approved ESD workstation.
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3 Detailed Description
3.1 Hardware Description
The following sections provide detailed information on the EVM hardware and jumper configuration settings.
3.1.1 Theory of Operation for the BOOSTXL-DAC-PORT
The BOOSTXL-DAC-PORT is a generic evaluation platform for catalog DACs that provides various options for
power supply, reference, communication interfaces, and GPIO for a DAC EVM. The DAC EVM interfaces with a
predefined set of signals common to a precision DAC. The block diagram of this board is shown in Figure 3-1.
External
Power
I2C
SPI/GPIO SPI/GPIO
5 V / 3.3 V
Analog IO
Power
External Refererence
DAC EVM Interface
Reference Jumper Settings Power-Supply Jumper Settings
Digital Level
Translator
I2C Level
Translator
Analog and Power Supply Function Extender
Launchpad Interface Launchpad Interface
Figure 3-1. BOOSTXL-DAC-PORT Hardware Block Diagram
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3.1.2 Signal Definition of the BOOSTXL-DAC-PORT
The BOOSTXL-DAC-PORT provides hardware connectors for the Analog EVM Controller (J13, J14), external
power (J12), the TPL1401EVM (J1, J2), and the external function extender (J4, J5). The descriptions are
provided in Table 3-1 through Table 3-5.
Table 3-1. BOOSTXL-DAC-PORT J13 Pin Definitions
Pin# Signal Description
11 GPIO General-purpose I/O
12 CS SPI CS or general-purpose I/O
13 GPIO SPI
14 MISO SPI MISO
15 MOSI SPI MOSI
16 RST MCU reset output
17 GPIO General-purpose I/O
18 GPIO General-purpose I/O
19 GPIO General-purpose I/O
20 GND Ground
31 GPIO General-purpose I/O
32 GPIO General-purpose I/O
33 GPIO General-purpose I/O
34 GPIO General-purpose I/O
35 EXT_LDAC External LDAC I/O
36 EXT_LDAC External LDAC I/O
37 SPI_BUF_EN Digital, SPI buffer enable
38 GPIO General-purpose I/O
39 GPIO General-purpose I/O
40 GPIO General-purpose I/O
Table 3-2. BOOSTXL-DAC-PORT J14 Pin Definitions
Pin# Signal Description
1 +3.3V 3.3-V power supply
2 GPIO General-purpose I/O
3 GPIO General-purpose I/O
4 GPIO General-purpose I/O
5 GPIO General-purpose I/O
6 GPIO General-purpose I/O
7 SCLK_A0 SPI SCLK or I2C A0
8 GPIO General-purpose I/O
9 SCL I2C SCL
10 SDA I2C SDA
21 +5V 5-V power supply
22 GND Ground
23 GPIO General-purpose I/O
24 GPIO General-purpose I/O
25 VDD_SENSE Sense Input for VDD
26 VIO_SENSE Sense Input for VIO
27 GPIO General-purpose I/O
28 GPIO General-purpose I/O
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Table 3-2. BOOSTXL-DAC-PORT J14 Pin Definitions
(continued)
Pin# Signal Description
29 GPIO General-purpose I/O
30 GPIO General-purpose I/O
Table 3-3. BOOSTXL-DAC-PORT J4 Pin Definitions
Pin# Signal Description
1 AIO0 Analog I/O
2 AGND Analog ground
3 AIO2 Analog I/O
4 AIO4 Analog I/O
5 AGND Analog ground
6 AIO6 Analog I/O
7 AIO8 Analog I/O
8 AGND Analog ground
9 AIO10 Analog I/O
10 AIO12 Analog I/O
11 AGND Analog ground
12 AIO14 Analog I/O
13 EXT_REF External reference input
14 GND Ground
15 VCC VCC output
16 VDD VDD output
Table 3-4. BOOSTXL-DAC-PORT J5 Pin Definitions
Pin# Signal Description
1 AIO1 Analog I/O
2 AGND Analog Ground
3 AIO3 Analog I/O
4 AIO5 Analog I/O
5 AGND Analog Ground
6 AIO7 Analog I/O
7 AIO9 Analog I/O
8 AGND Analog Ground
9 AIO11 Analog I/O
10 AIO13 Analog I/O
11 AGND Analog Ground
12 AIO15 Analog I/O
13 REFGND External Reference Ground
14 GND Ground
15 VSS VSS Output
16 VIO or DAC_VIO VIO or DAC_VIO Output
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Table 3-5. BOOSTXL-DAC-PORT J12 Pin Definitions
Pin# Signal Description
1VCC High-voltage positive power
supply
2VSS High-voltage negative power
supply
3 GND Ground
4 EXT_VDD External VDD
5 EXT_VIO External VIO
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3.1.3 Theory of Operation for the TPL1401EVM Hardware
Figure 3-2 shows the block diagram of the TPL1401EVM board. The EVM board connects to BOOSTXL-DAC-
PORT with two 16-pin connectors. These headers provide access to all DAC pins. The EVM board also houses
an EEPROM and an I2C buffer.
Figure 3-2. TPL1401EVM Hardware Block Diagram
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3.1.4 Signal Definition of the TPL1401EVM
The TPL1401EVM provides access to all DAC pins through connection J1 and J2, as listed in Table 3-6 and
Table 3-7.
Table 3-6. TPL1401EVM J2 Pin Definitions
Pin# Signal Description
1 VDD VDD power supply
2 A0 I2C address select
3 NC Not connected
4 SCL I2C SCL
5 REF Reference input
6 NC Not connected
7 NC Not connected
8 NC Not connected
9 NC Not connected
10 NC Not connected
11 NC Not connected
12 NC Not connected
13 AGND Analog ground
14 AGND Analog ground
15 AGND Analog ground
16 AGND Analog ground
Table 3-7. TPL1401EVM J1 Pin Definitions
Pin# Signal Description
1 GND PCB ground
2 NC Not connected
3 NC Not connected
4 SDA I2C SDA
5 VOUT DAC output
6 VFB DAC feedback pin
7 DAC_VIO Pull-up for DAC I2C signals
8 VIO Power supply for EEPROM
9 NC Not connected
10 NC Not connected
11 NC Not connected
12 LDO_CAP LDO bypass capacitor
13 AGND Analog ground
14 AGND Analog ground
15 AGND Analog ground
16 AGND Analog ground
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3.2 Software Description
This section describes the features of the TPL1401 EVM software, and discusses how to use these features.
The software provides basic control of all the registers and functions to the TPL1401 device.
3.2.1 Starting the Software
To launch the software, locate the Texas Instruments folder in the All Programs menu, and select the TPL1401
EVM icon.
Figure 3-3. TPL1401EVM GUI Location
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Figure 3-4 shows that if the Analog EVM Connector is connected correctly, the status bar at the bottom of the
screen displays Hardware Connected. If the Analog EVM Controller is not properly connected or not connected
at all, the status bar displays Hardware not connected. In case the Hardware not connected status persists even
after the hardware is connected, go to Options → Serial Port, and change the port to the other available port with
the (Texas Instruments) or ACCtrl tag. Out of the two ports with these tags, one port should connect.
Figure 3-4. TPL1401EVM GUI Connection Detection
3.2.2 Software Features
The TPL1401 EVM incorporates interactive functions that help configure the TPL1401 device. These functions
are built into several GUI pages, as shown in the following sections. The Menu allows the user to switch between
the pages, with each page representing a feature of the software.
3.2.2.1 Home Page
Figure 3-5 shows the page providing the basic information and navigation to other pages. Click on Learn More...
to get more information on the device.
Figure 3-5. TPL1401EVM Software Home Page
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3.2.2.2 Setup Page
Figure 3-6 shows the page that guides the user to perform a one-time firmware upgrade for the Analog EVM
Controller, and details how the Analog EVM Controller, BOOSTXL-DAC-PORT, and TPL1401EVM are stacked.
This page also shows the default jumper settings for the BOOSTXL-DAC-PORT.
Figure 3-6. TPL1401EVM Setup Page
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3.2.2.3 DIGIPOT Quick-Start Page
This section provides quick access to some of the digipot functions like EEPROM programming and basic digipot
configurations.
3.2.2.3.1 Basic DPOT Configuration Tab
Figure 3-7 shows the Basic DPOT setup tab that provides an interface to quickly power up, select the reference
and output span, and program the output voltage (decimal) for the TPL1401. The TPL1401 comes in Hi-Z power-
down mode by default.
Note
The basic DAC setup for power up, reference selection, and output span selection available in this tab
is common to all the tab functions.
The EEPROM PROGRAM button is used to write the latest register settings to the EEPROM. The RELOAD
button is used to retrieve the settings stored in the EEPROM. The A0 pin programming has not been provided in
this version of the software, although the hardware has options for all four possible configurations.
Figure 3-7. TPL1401EVM Quick-Start Page : Basic DPOT Configuration
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3.2.2.4 Register Map Page
The TPL1401 EVM Register Map page, shown in Figure 3-8, allows the user to access low level communication
directly with the TPL1401 registers. Selecting a register on the Register Map list shows a description of the
values in that register, as well as information on the register address, default value, size, and current value.
Values are read from and written to the registers by writing to the Value or bit field of the GUI.
Figure 3-8. Register Map Page
There are some configuration lists and action buttons provided on the Register Map page. The values of the
register map can be stored locally by pressing the Save Registers button under the File menu option.
Additionally, the stored configuration files can be recalled and loaded through the Load Registers button. Other
options selectable by the user are the Auto Read Interval,Read Register, Read All Registers, Write Register,
Write All Registers, and Update Mode buttons. All buttons are displayed in Figure 3-9. The Write Register and
Write All Registers buttons are enabled only with Deferred update mode. Deferred mode initiates a write
operation only when the Write Register or the Write All Registers button is pressed. By default, the Immediate
update mode is selected for the Register Map page write operations.
Figure 3-9. Register Page Options
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