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BoosterPack BOOSTXL-ADS7841-Q1
User Manual
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Texas Instruments BoosterPack BOOSTXL-ADS7841-Q1 User Manual

User's Guide
SNAU229–December 2017
BOOSTXL-ADS7841-Q1 BoosterPack™ User's Guide
Contents
1 Introduction ................................................................................................................... 2
2 BOOSTXL-ADS7841-Q1 EVM Overview................................................................................. 4
3 BOOSTXL-ADS7841-Q1EVM EVM Setup ............................................................................... 6
4 BOOSTXL-ADS7841-Q1 EVM GUI Operation ......................................................................... 14
5 Bill of Materials, Printed-Circuit Board Layout, and Schematics ..................................................... 19
List of Figures
1 BOOSTXL-ADS7841-Q1 EVM Block Diagram .......................................................................... 3
2 BOOSTXL-ADS7841-Q1EVM Top Level Overview..................................................................... 4
3 BOOSTXL-ADS7841-Q1 EVM GUI Installation.......................................................................... 6
4 BOOSTXL-ADS7841-Q1 EVM Driver Installation ....................................................................... 7
5 TM4C1294 LaunchPad™ Stellaris Virtual Serial Port and ICDI Driver............................................... 8
6 TM4C1294 LaunchPad™ Software Programming Setup .............................................................. 9
7 TM4C1294 LaunchPad™ selection in Configuration Tab............................................................. 10
8 TM4C1294 LaunchPad™ Programming Using LM Flash Programmer............................................. 11
9 TMC1294 LaunchPad™ VIA BoosterPack Driver ..................................................................... 12
10 BOOSTXL-ADS7841-Q1EVM stacked on TM4C1294 LaunchPad™ .............................................. 13
11 ADS7841-Q1EVM GUI Landing Page................................................................................... 14
12 AIN0 (Channel0) Voltage.................................................................................................. 15
13 AIN3 (Channel3) Voltage.................................................................................................. 16
14 Frequency Domain Analysis Page....................................................................................... 17
15 BOOSTXL-ADS7841-Q1 Top Layer Routing........................................................................... 20
16 BOOSTXL-ADS7841-Q1 Ground Layer................................................................................. 21
17 BOOSTXL-ADS7841-Q1 Power Layer .................................................................................. 22
18 BOOSTXL-ADS7841-Q1 Bottom Layer Routing....................................................................... 23
19 BOOSTXL-ADS7841-Q1 EVM Schematic Diagram ................................................................... 24
1 Input Connector and Channel Configuration............................................................................. 4
2 Bill of Materials ............................................................................................................. 19
Trademarks
BoosterPack, LaunchPad, TM4C1294 LaunchPad are trademarks of Texas Instruments.
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List of Tables
BOOSTXL-ADS7841-Q1 BoosterPack™ User's Guide
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Introduction

1 Introduction

The BOOSTXL-ADS7841-Q1 BoosterPack™ is a fully-assembled evaluation platform designed to highlight the ADS7841-Q1 device features and its various modes of operations.
The BOOSTXL-ADS7841-Q1 EVM interfaces to the TM4C1294 LaunchPad™ Development Kit (EK-
TM4C1294XL). The Tiva C Series TM4C1294 MCU on the TM4C1294 LaunchPad™ communicates with
the ADS7841-Q1 through its SPI interface and acts as a USB-to-PC GUI communication bridge.
NOTE: The BOOSTXL-ADS7841-Q1 requires an external master controller to evaluate the
ADS7841-Q1.
The TM4C1294 LaunchPad™ is controlled by commands received from the BOOSTXL-ADS7841-Q1 EVM GUI, and returns data to the GUI for display and analysis. If the TM4C1294 LaunchPad™ is not used, the BoosterPack plug-in module format of the BOOSTXL-ADS7841-Q1 board allows an alternative external host to communicate with the ADS7841-Q1.
The BOOSTXL-ADS7841-Q1 EVM incorporates all required circuitry and components with the following features:
• ADS7841-Q1 12-bit, 4-channel, automotive qualified SAR ADC with SPI interface
• Optional low power voltage reference, TI’s REF5045A, to generate a 4.5-V reference for the ADS7841­Q1 VREF pin when using 5.0 V from TM4C1294 LaunchPad™
• Optional precision, low noise, dual operational amplifier, TI's OPA2320, to generate buffered input for the ADS7841-Q1 AIN0 and AIN2 pins
• Optional adjustable linear regulator, TI’s TPS79901, to generate stable 5V output voltage to power the ADS7841-Q1 VCC pin when using the USB power from the TM4C1294 LaunchPad™
• SPI interface for communication and configuration of modes available on the ADS7841-Q1
Figure 1 shows the BOOSTXL-ADS7841-Q1 EVM architecture, identifying the key components and blocks
previously listed.
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Introduction
Figure 1. BOOSTXL-ADS7841-Q1 EVM Block Diagram
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BOOSTXL-ADS7841-Q1 EVM Overview

2 BOOSTXL-ADS7841-Q1 EVM Overview

Section 2 describes various onboard components that are used to interface analog input, digital interface,
and provide power supply to BOOSTXL-ADS7841-Q1 EVM. Figure 2 shows a BOOSTXL-ADS7841-Q1 EVM overview.
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Figure 2. BOOSTXL-ADS7841-Q1EVM Top Level Overview

2.1 Connectors for Analog Input

The BOOSTXL-ADS7841-Q1 EVM is designed for easy interface to analog sources through a 100-mil header. Connector J10 allows analog source connectivity. Table 1 lists the analog input connector and input channel configuration.
Table 1. Input Connector and Channel Configuration
J10 Connector Pin Description
J10:1 Single-ended analog input for channel 0 of ADC J10:2 Single-ended analog input for channel 1 of ADC J10:3 Single-ended analog input for channel 2 of ADC
J10:4 Single-ended analog input for channel 3 of ADC J10:1 - J10:2 Pseudo-Differential analog input for channel 0 - channel 1 of ADC J10:2 - J10:1 Pseudo-Differential analog input for channel 1 - channel 0 of ADC J10:3 - J10:4 Pseudo-Differential analog input for channel 2 - channel 3 of ADC J10:4 - J10:3 Pseudo-Differential analog input for channel 3 - channel 2 of ADC
J10:5 and J10:6 BoosterPack ground
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The analog input range is from GND to +VREF when configured as single-ended inputs. A maximum of four single-ended inputs may be applied to J10, using pins J10:1 to J10:4. When configured for differential mode operation, the positive analog input level has a range of -0.2V to VCC + 0.2V. The voltage on the negative analog input is limited between -0.2V and 1.25V. A maximum of two pseudo-differential inputs may be applied to J10, using pins J10:1 - J10:2, and J10:3 - J10:4.
The input to channel 0 can be optionally configured to use the OPA2320 buffer through 100ohm resistor with an 560pF capacitor to GND. Jumper J8 can be placed on pins 1-2 to select this unity gain buffer configuration of the OPA2320 and in this case channel 0 input is provided via SMA connector J7. A similar configuration is available for channel 2 input as well by using Jumper J12 pins 1-2 and via SMA connector J11.
By default, AIN3 is factory configured by Jumper J15 pins 1-2 and J15 pins 3-4 on the BOOSTXL­ADS7841-Q1 EVM to measure a fraction of the 5V supply voltage using simple resistor divider circuit formed by R35/R36 (see schematic in Figure 19 ). Please ensure Jumper J15 shunts are disconnected when using J10.3 as AIN3 input.

2.2 Voltage Reference

The BOOSTXL-ADS7841-Q1 EVM has two sources for the reference voltage. Jumper J13 can select the VREF voltage from either the REF5045A (U9) or from 5V VCC. The EVM is factory configured for use with the REF5045A 4.5V reference (J13 pins 2-3).

2.3 Digital Interface

As noted in Section 1, the BOOSTXL-ADS7841-Q1 EVM interfaces with the TM4C1294 LaunchPad™, which in turn communicates with the computer over USB. The two devices on the booster pack that the TM4C1294 communicates with are the ADS7841-Q1 ADC (over SPI) and the EEPROM (over I2C). The EEPROM comes preprogrammed with the information required to configure and initialize the BOOSTXL­ADS7841-Q1 EVM platform every time on power up.
BOOSTXL-ADS7841-Q1 EVM Overview

2.4 ADS7841-Q1EVM Digital I/O Interface

The BOOSTXL-ADS7841-Q1 EVM supports the SPI digital interface and functional modes as detailed in the ADS7841-Q1EVM device data sheet (SBAS469). The TM4C1294 LaunchPad™ is operating at a 3.3-V logic level and is connected to the 5.0-V digital I/O lines of the ADC through level shifter (SN74LVC2T45QDCURQ1).

2.5 Power Supplies

The device supports a single supply with a wide range of operation. The VCC can operate from 2.7 V to
5.0 V. TI’s TPS79901 adjustable voltage regulator available onboard is configured to supply 5.0 V to ADS7841-Q1 VCC pin on the BOOSTXL-ADS7841-Q1 EVM.
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BOOSTXL-ADS7841-Q1EVM EVM Setup

3 BOOSTXL-ADS7841-Q1EVM EVM Setup

3.1 BOOSTXL-ADS7841-Q1 EVM Graphical User Interface Software Installation

The following steps describe the BOOSTXL-ADS7841-Q1 EVM GUI software installation:
1. Download the latest version of the EVM graphical user interface (GUI) installer from the Tools and
Software folder of the device, and run the GUI installer to install the EVM GUI software on your
windows PC.
2. Accept the License Agreements and follow the on-screen instructions to complete the installation (see
Figure 3).
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Figure 3. BOOSTXL-ADS7841-Q1 EVM GUI Installation
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3. As a part of the BOOSTXL-ADS7841-Q1 EVM GUI installation, a prompt with a Device Driver
BOOSTXL-ADS7841-Q1EVM EVM Setup
Installation Wizard appears on the screen (see Figure 4). Click the Next button to proceed, then click the Finish button when the installation is complete.
Figure 4. BOOSTXL-ADS7841-Q1 EVM Driver Installation
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BOOSTXL-ADS7841-Q1EVM EVM Setup
4. Open the computer's "Device Manager". You must be able to see the "Stellaris Virtual Serial Port" and "Stellaris In-Circuit Debug Interface" as shown in Figure 5.
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Figure 5. TM4C1294 LaunchPad™ Stellaris Virtual Serial Port and ICDI Driver
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BOOSTXL-ADS7841-Q1EVM EVM Setup
3.2 LM Flash Programmer for TM4C1294 LaunchPad™ Software Programming
The TM4C1294 LaunchPad™ ships with a default firmware program flashed on its memory. When a TM4C1294 LaunchPad™ is connected to the PC for the first time, its firmware needs to be updated for communications with the BOOSTXL-ADS7841-Q1 EVM. The following steps describe the programming of this firmware on the flash memory:
1. Download the latest version of LM Flash Programmer. The LM Flash Programmer is also included as part of the BOOSTXL-ADS7841-Q1 EVM GUI installation in the following folder: C:\Program Files (x86)\Texas Instruments\ADS7841\Firmware
2. Make sure the power select JP1 jumper on the TM4C1294 LaunchPad™ is on ICDI. Connect the Debug USB port on the TM4C1294 LaunchPad™ to the PC with a micro USB cable as shown in
Figure 6. This must light the green power LED D0 on the TM4C1294 LaunchPad™.
Figure 6. TM4C1294 LaunchPad™ Software Programming Setup
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