Texas Instruments BoosterPack BOOSTXL-ADS7142-Q1 User manual

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BOOSTXL-ADS7142-Q1 BoosterPack™ Plug-In Module
User's Guide
SBAU321A–November 2018–Revised August 2019
BOOSTXL-ADS7142-Q1 BoosterPack™ Plug-In Module
The ADS7142-Q1 BoosterPack™ plug-in module (BOOSTXL-ADS7142-Q1) allows users to evaluate the
functionality of Texas Instruments' ADS7142-Q1 nanopower, dual-channel programmable sensor monitor.
This user’s guide describes both the hardware platform showcasing the ADS7142-Q1 device and the
graphical user interface (GUI) software used to configure the various modes of operation of this device.
Contents
1 Introduction ................................................................................................................... 2
2 BOOSTXL-ADS7142-Q1 EVM Overview................................................................................. 3
3 BOOSTXL-ADS7142-Q1 EVM Initial Setup.............................................................................. 5
4 ADS7142-Q1 GUI Functional Modes.................................................................................... 13
5 Bill of Materials, Printed-Circuit Board Layout, and Schematics..................................................... 22
List of Figures
1 ADS7142-Q1 EVM Block Diagram........................................................................................ 2
2 BOOSTXL-ADS7142-Q1 Top Level Overview........................................................................... 3
3 Installation of browser extension and TI Clould Agent.................................................................. 5
4 MSP432E401Y LaunchPad™ 5V-OTG Jumper and Debug Port Location.......................................... 6
5 UNIFLASH Programming Setup........................................................................................... 6
6 Successful FLASH Program ............................................................................................... 7
7 BOOSTXL-ADS7142-Q1 Stacked on MSP432E401Y LaunchPad™ ................................................ 8
8 ADS7142-Q1 GUI Landing Page.......................................................................................... 9
9 ADS7142-Q1 Register Map Page........................................................................................ 10
10 ADS7142-Q1 Mode Configuration Page ................................................................................ 11
11 ADS7142-Q1 General Instructions Page................................................................................ 12
12 Data Capture in Start Burst Mode ....................................................................................... 13
13 Data Capture in Stop Burst Mode........................................................................................ 14
14 Operation in Pre Alert Mode.............................................................................................. 15
15 Operation After Alert Condition........................................................................................... 16
16 Operation in Post Alert Mode............................................................................................. 17
17 Operation in High Precision Mode ....................................................................................... 18
18 Operation in Default Manual Mode ...................................................................................... 19
19 Operation in Auto Manual Mode ......................................................................................... 20
20 BOOSTXL_ADS7142-Q1 PCB Top Overlay ........................................................................... 24
21 BOOSTXL-ADS7142-Q1 Top Layer Copper and Silkscreen......................................................... 25
22 BOOSTXL-ADS7142-Q1 Bottom Layer Copper and Silkscreen..................................................... 26
23 ADS7142-Q1 BoosterPack™ Schematic Diagram..................................................................... 27
List of Tables
1 Input Connector and Channel Configuration............................................................................. 3
2 Modification Required for NTC Monitoring.............................................................................. 21
3 Bill of Materials ............................................................................................................. 22

SCL
SDA
ALERT
3V3
Host MCU
GND
C
BUSY/RDY
GND GND
AIN0
AIN1
ADS7142-Q1
+
Sensor 1
GND
+
GND
Sensor 2
GND
C
RFLT
RFLT
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Trademarks
BoosterPack, LaunchPad are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
1 Introduction
The ADS7142-Q1 BoosterPack™ is a fully-assembled evaluation platform designed to highlight the
ADS7142-Q1 features and various modes of operations that makes this device suitable for ultra-low-
power, small-size sensor monitor applications.
The accompanying MSP-EXP432E401Y LaunchPad™ development kit is used as a USB-to-PC GUI
communication bridge, and example implementation of a master MCU to communicate with the ADS7142-
Q1 through its I2C interface.
NOTE: The BOOSTXL-ADS7142-Q1 requires an external master controller to evaluate the
ADS7142-Q1.
The MSP-EXP432E401Y is controlled by commands received from the ADS7142-Q1 GUI, and returns
data to the GUI for display and analysis. If the MSP-EXP432E401Y is not used, the BoosterPack™ plug-in
module format of the BOOSTXL-ADS7142-Q1 board allows an alternative external host to communicate
with the ADS7142-Q1.
The BOOSTXL-ADS7142-Q1 incorporates all required circuitry and components with the following
features:
• ADS7142-Q1 nano power, ultra-small, dual-channel sensor monitor with I2C interface and alert output
• Optional low power voltage reference, TI’s REF3133-Q1, to generate a 3.3-V output to power the
ADS7142-Q1 AVDD supply pin when the 5-V USB power from the MSP432E401Y LaunchPad™
• Optional adjustable linear regulator, TI’s TPS79933-Q1, to generate stable output voltage to power the
ADS7142-Q1 DVDD pin when using the 5-V USB power from the MSP432E401Y LaunchPad™
• I2C interface for communication and configuration of modes available on the ADS7142-Q1
Figure 1 shows the ADS7142-Q1EVM architecture, identifying the key components and blocks previously
listed.
Figure 1. ADS7142-Q1 EVM Block Diagram

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2 BOOSTXL-ADS7142-Q1 EVM Overview
This section describes various onboard components that are used to interface analog input, digital
interface, and provide power supply to BOOSTXL-ADS7142-Q1. Figure 2 shows a BOOSTXL-ADS7142-
Q1 overview.
Figure 2. BOOSTXL-ADS7142-Q1 Top Level Overview
2.1 Connectors for Single-Ended Analog Input
The BOOSTXL-ADS7142-Q1 is designed for easy interface to an external, analog, single-ended source
through a 100-mil header. Connector J5 allows analog source connectivity. Table 1 lists the analog input
connector and input channel configuration.
Table 1. Input Connector and Channel Configuration
J5 Connector Pin Description
J5:1 Single-ended analog input for channel 0 of ADC
J5:2 Single-ended analog input for channel 1 of ADC
J5:3 and J5:4 BoosterPack™ ground

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2.2 Digital Interface
As noted in Section 1, the BOOSTXL-ADS7142-Q1 interfaces with the MSP-EXP432E401Y LaunchPad™,
which in turn communicates with the computer over USB. The two devices on the booster pack that the
MSP432E401Y communicates over I2C are the ADS7142-Q1 ADC and the EEPROM. The EEPROM
comes preprogrammed with the information required to configure and initialize the BOOSTXL-ADS7142-
Q1 platform. Once the hardware is initialized, the EEPROM is no longer used.
2.3 ADS7142-Q1 Digital I/O Interface
The BOOSTXL-ADS7142-Q1 supports the I2C digital interface and functional modes as detailed in the
ADS7142-Q1 data sheet. The MSP432E401Y LaunchPad™ is capable of operating at a 3.3-V logic level
and is directly connected to the digital I/O lines of the ADC.
2.4 Power Supplies
The device supports a wide range of operation on its analog supplies. The AVDD can operate from 1.65 V
to 3.6 V. The DVDD operates from 1.65 V to 3.6 V, independent of the AVDD supply. The 3.3-V voltage
regulator available on the MSP-EXP432E401Y is used to supply 3.3 V to both AVDD and DVDD on the
BOOSTXL-ADS7142-Q1.
There is an onboard option to use an ultra-low power voltage reference REF3133-Q1 (U2) to generate
3.3-V supply for the ADS7142-Q1 AVDD pin. Voltage variants of REF3330 can be used to generate
supply other than 3.3-V for the ADS7142-Q1 AVDD pin. To generate a DVDD supply other than 3.3 V, an
adjustable version of the TPS799-Q1 regulator (U3) can be used.

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3 BOOSTXL-ADS7142-Q1 EVM Initial Setup
3.1 Running ADS7142-Q1 GUI Online and TI Cloud Agent Application Installation
The following steps describe the ADS7142-Q1 GUI software installation:
1. Go to the BOOSTXL-ADS7142-Q1 TI website and Download the BOOSTXL-ADS7142-Q1 GUI
software. It might require to login user account privileges to use the online version as well as
installation of the applications.
2. Click on the BOOSTXL-ADS7142-Q1 GUI icon. First time users may be prompted to download and
install the browser extension for Firefox or Chrome and the TI Cloud Agent Application, as shown in
Figure 3.
Figure 3. Installation of browser extension and TI Clould Agent

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3.2 UNIFLASH Programmer for MSP-EXP432E401Y Software Programming
The MSP432E401Y LaunchPad™ ships with a default firmware program flashed on its memory. When a
LaunchPad™ is connected to the PC for the first time, its firmware needs to be updated for
communications with the BOOSTXL-ADS7142-Q1. The following steps describe the programming of this
firmware on the flash memory:
1. On MSP432E401Y LaunchPad™, remove the jumper JP6 from its default position and place it on the
JP1 jumper - 5V-OTG location as shown in Figure 4.
2. Connect the MSP432E401Y LaunchPad™ debug connector to an available USB port on the PC.
Figure 4. MSP432E401Y LaunchPad™ 5V-OTG Jumper and Debug Port Location
3. After the BOOSTXL-ADS7142-Q1 GUI is set up, select Program Device, as shown in Figure 5, from
the File menu option. This selection automatically recognizes the MSP432E401Y LaunchPad™ and
the FLASH program to communicate with the EVM.
Figure 5. UNIFLASH Programming Setup

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4. After programming and verification is successful, as shown in Figure 6, disconnect the USB from the
MSP-EXP432E401Y debug port.
Figure 6. Successful FLASH Program

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3.2.1 Setup Instructions
Following are the instructions to set up the BOOSTXL-ADS7142-Q1 for evaluation:
1. Stack the BOOSTXL-ADS7142-Q1 on the MSP432E401Y LaunchPad™ MSP-EXP432E401Y. Make
sure the 20-pin connector (J1, J3) on BOOSTXL-ADS7142-Q1 is mapped against connector (J5, J7)
and connector (J4, J2) on BOOSTXL-ADS7142-Q1 is mapped against connector (J8, J6) on MSP-
EXP432E401Y. Pin 1 of BOOSTXL-ADS7142-Q1 must align with pin 1 of connector J5 (3V3) on MSP-
EXP432E401Y.
2. Connect the micro USB from data port of MSP-EXP432E401Y to available USB port on PC.
3. Figure 7 shows the assembled BOOSTXL-ADS7142-Q1 and MSP-EXP432E401Y configuration.
Figure 7. BOOSTXL-ADS7142-Q1 Stacked on MSP432E401Y LaunchPad™

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3.3 ADS7142-Q1 GUI Description
3.3.1 Description
Figure 8 shows the landing page of the ADS7142-Q1 GUI. This page provides a high-level overview of the
ADS7142-Q1 device. The left corner shows the tabs required to navigate through the ADS7142-Q1
register map and the ADS7142-Q1 functional modes page. When the MSP432E401Y with the BOOSTXL-
ADS7142-Q1 stacked is connected to the PC via the micro USB cable, the GUI detects the
BoosterPack™ by reading the onboard EEPROM. Once detected and connected, the GUI indicates this
status as "CONNECTED". At the bottom left corner of the GUI, there is an option to connect and dis-
connect the hardware from the GUI.
Figure 8. ADS7142-Q1 GUI Landing Page

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3.3.2 REGMAP
Figure 9 shows register map page for the ADS7142-Q1. On the top right corner, options to read registers
individually, read all the registers at once, or write individual register are available. Users can choose to
have the register values modified in the GUI to be written on the device instantaneously by selecting the
Immediate option or later using the Deferred option.
Figure 9. ADS7142-Q1 Register Map Page

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3.3.3 Functional Mode
Figure 10 shows the functional mode page of the ADS7142-Q1 GUI. This page enables the user to
navigate and SET various functional modes of the device (Autonomous and I2C command mode) and set
channel-specific configurations. On the top right corner is an option to enable all ADC channels and
enable alert functionality. TI recommends enabling these blocks and then to enable or disable the
preferred ADC channel based on user preference.
Figure 10. ADS7142-Q1 Mode Configuration Page

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3.3.4 General Instructions
This section describes the steps involved in selecting functional modes of operation or channel-specific
configurations and capturing the data in the selected functional mode:
1. Enable All Channels and Enable Alert on the top right corner of GUI page.
2. Enter channel-specific configurations such as high and low thresholds, hysteresis, and Alert
functionality.
3. Select Conversion Mode by clicking on either Autonomous Mode or Manual Mode.
4. Select the Operating Mode from drop-down menu and click SET to write register specific to that
particular mode.
5. Press Start Sequence to capture conversion data from ADS7142-Q1.
NOTE: The Start Sequence button will remain disabled until the selected Functional Mode is SET as
step 4 indicates.
Figure 11. ADS7142-Q1 General Instructions Page

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4 ADS7142-Q1 GUI Functional Modes
The ADS7142-Q1 device has the following functional modes:
•Manual Mode: In this mode, the host provides I2C frames to control conversion and read data after
each conversion.
•Autonomous Mode: The device features an internal data buffer that can store the conversion results
of the ADC in Autonomous Mode without the host controlling the conversion.
•High Precision Mode: In High Precision Mode, the results stored in the internal data buffer are
accumulated to increase the precision of the conversion results.
The device powers up in Manual Mode and can be configured into any of the functional modes by writing
the configuration registers for the desired mode.
4.1 Autonomous Mode
In the Autonomous Conversion Mode, the device generates the start of conversion pulses using an
internal oscillator on receiving the first start of conversion pulse from the host. This can be configured by
selecting Autonomous Mode as the Conversion Mode, selecting one of the Operating Modes from the
drop-down menu, and pressing the SET button. The ADS7142-Q1 device then generates the subsequent
start of conversion signals autonomously. The Operating Modes offered in Autonomous Mode are
described in the following sections.
4.1.1 Start Burst Mode
When Start Bust Mode is selected from the Operating Modes drop-down menu and the SET button is
pressed, the device is configured to store 16 conversion results into the data buffer of the device. The
device will stop converting once the data buffer is filled. To understand the steps required to configure the
device in this mode, refer to the ADS7142-Q1 data sheet.
Figure 12 highlights the ADS7142-Q1 GUI working in Start Burst Mode.
Figure 12. Data Capture in Start Burst Mode

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4.1.2 Stop Burst Mode
When Stop Bust Mode is selected from the Operating Modes drop-down menu and the SET button is
pressed, the device will keep on sampling input signals and storing the conversion results in the data
buffer unless the user initiates the command to abort the sequence by pressing the Abort Sequence
button in the GUI and stops filling the data buffer. To understand the steps required to configure the
device in this mode, refer to the ADS7142-Q1 data sheet.
Figure 13 highlights the ADS7142-Q1 GUI working in Stop Burst Mode.
Figure 13. Data Capture in Stop Burst Mode

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4.1.3 Pre Alert Mode
When Pre Alert Mode is selected from the Operating Modes drop-down menu and the SET button is
pressed, the device starts conversions and stores the data in the data buffer until the input signal crosses
either the high or low threshold for the channels selected in the sequence. If the user aborts the sequence
before the data buffer is filled, the device will abort the sequence and stop storing the conversion results.
To understand the steps required to configure the device in this mode, refer to the ADS7142-Q1 data
sheet.
Figure 14 shows the ADS7142-Q1 GUI configured in Pre Alert Mode with the Alert functionality enabled
on channel 0. In this example, the High Threshold,Hysteresis, and Low Threshold are set. The thresholds
are marked on the graph in pink and hysteresis is indicated by the dotted line.
Figure 14. Operation in Pre Alert Mode

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Figure 15 shows the GUI after an Alert condition is encountered. In this example, Channel 0 has reached
the High Threshold. This is indicated by the High Threshold indicator on the right side of the
corresponding graph. Since the device is configured for Pre Alert Mode operation with both channels
enabled, the conditions prior to reaching the Alert condition are displayed. The Alert condition must be
cleared, by clicking on the Threshold indicator before the next sequence is run to ensure normal operation
of the device.
Figure 15. Operation After Alert Condition

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4.1.4 Post Alert Mode
When the device is configured in Post Alert Mode operation, the device starts converting the input signal
and storing the data in the data buffer only after it reaches one of the Alert thresholds set for the channels
selected in the sequence. If the user aborts the sequence before the data buffer is filled, the device stops
storing the conversion results. To understand the steps required to configure the device in this mode, refer
to the ADS7142-Q1 data sheet.
Figure 16 highlights the ADS7142-Q1 GUI working in Post Alert Mode. Once either of the low or high
thresholds is reached, make sure to read the Alert by clicking on the highlighted Alert block in red before
running the next sequence.
Figure 16. Operation in Post Alert Mode

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4.2 High Precision Mode
The High Precision Mode increases the accuracy of the data measurement to 16-bit accuracy. This is
useful for applications where the level of precision required to accurately measure the sensor output
needs to be higher than 12-bits. When High Precision Mode is selected from the Operating Modes drop-
down menu and the SET button is pressed, the device starts conversions and starts accumulating the
conversion results in an accumulator. The device stops accumulating the conversion results in the
accumulator after 16 conversions. If the user aborts the sequence before 16 conversions, then the device
will abort the sequence. To understand the steps required to configure the device in this mode, refer to the
ADS7142-Q1 data sheet.
Figure 17 highlights the ADS7142-Q1 GUI working in High Precision Mode. The maximum number of
accumulator count that can be entered into the ACCUMULATOR_CFG register is 15 (0x0F) which
corresponds to 16 conversions.
Figure 17. Operation in High Precision Mode

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4.3 Manual Mode
Manual Mode allows the external host processor to directly request and control when the data is sampled.
The data capture is initiated by an I2C command from the host processor and the captured data is then
returned over the I2C bus. Manual Mode can work one of the following states based on power up or user-
initiated conditions.
4.3.1 Default Mode
On power up, the device is in Manual Mode with single-ended and dual-channel configuration and it
samples the analog input applied on Channel 0 (AIN0-GND) . In this mode, the device uses high-
frequency oscillator for conversions. Figure 18 highlights the ADS7142-Q1 GUI working in Manual Mode:
Default State.
Figure 18. Operation in Default Manual Mode

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4.3.2 Auto Mode
The host can either configure the device to scan through one channel or both channels by configuring the
CHANNEL_IP_CFG register and AUTO_SEQ register. The host has to provide continuous clock (SCL) to
the device to scan through the channels and read the data from the device. Figure 19 highlights the
ADS7142-Q1 GUI working in Manual Mode:Default State.
To understand the steps required to configure the device in Manual Mode, refer to the ADS7142-Q1 data
sheet.
Figure 19. Operation in Auto Manual Mode