Texas Instruments ADS131E08EVM-PDK User manual

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Performance Demonstration Kit for the ADS131E08
User's Guide
SBAU200C–June 2012–Revised April 2020
Performance Demonstration Kit for the ADS131E08
Figure 1. ADS131E08EVM-PDK
This user's guide describes the characteristics, operation, and use of the ADS131E08EVM-PDK. This
performance demonstration kit is an evaluation module for the ADS131E08, an eight-channel, 24-bit, low-
power, integrated analog front-end (AFE) designed for power protection circuits. The ADS131E08EVM-
PDK is intended for prototyping and evaluation. This user's guide includes a complete circuit description,
schematic diagram, and bill of materials.
Throughout this document, the terms ADS131E08EVM-PDK, demonstration kit, evaluation board,
evaluation module, and EVM are synonymous with the ADS131E08EVM.
The following related documents are available through the Texas Instruments web site at www.ti.com.
Table 1. Related Documentation
Device Literature Number
ADS131E08 SBAS561
Contents
1 ADS131E08EVM Overview................................................................................................. 3
2 Software Installation......................................................................................................... 5
3 ADS131E08EVM Daughter-Card Hardware Overview................................................................ 10

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4 Using the Software......................................................................................................... 14
5 ADS131E08 Analysis Tools............................................................................................... 22
6 Bill of Materials (BOM), Layout, and Schematic ....................................................................... 28
List of Figures
1 ADS131E08EVM-PDK ...................................................................................................... 1
2 ADS131E08EVM-PDK Kit.................................................................................................. 4
3 Initialization of ADS131E08EVM GUI..................................................................................... 6
4 License 1...................................................................................................................... 6
5 License 2...................................................................................................................... 6
6 New Hardware Wizard Screen 1 .......................................................................................... 7
7 New Hardware Wizard Screen 2 .......................................................................................... 7
8 New Hardware Wizard Screen 3 .......................................................................................... 8
9 Completion of the First USB Driver........................................................................................ 8
10 Second New Hardware Wizard Screen................................................................................... 9
11 Installing the USBStyx Driver .............................................................................................. 9
12 File Save Option Under Save Tab....................................................................................... 14
13 Channel Registers GUI for the Configuration Registers .............................................................. 15
14 Channel Control Register GUI Panel: Single Channel Enabled ..................................................... 16
15 Channel Control Registers GUI Panel: All Channels Enabled....................................................... 16
16 Example of Internal Test Signals Viewed on the Scope Display Tab............................................... 17
17 Internal Temperature Sensor ............................................................................................. 18
18 Eight-Channel Read of Internal Temperature Data.................................................................... 18
19 GPIO Control Register GUI Panel ....................................................................................... 19
20 Fault Status Indicator...................................................................................................... 20
21 Device Register Settings.................................................................................................. 21
22 Scope Tool Features....................................................................................................... 22
23 Scope Analysis Tab (Noise Levels for Each Channel Shown)....................................................... 23
24 Zoom Option on the Waveform Examination Tool..................................................................... 23
25 Histogram Bins ............................................................................................................. 24
26 Statistics for the Signal Amplitude of Eight Channels................................................................. 24
27 Analysis→FFT Graph of Normal Electrode Configuration............................................................ 25
28 Analysis→FFT→AC Analysis Parameters: Windowing Options..................................................... 26
29 Analysis→FFT→FFT Analysis: Input Short Condition ................................................................ 26
30 Changing the User-Defined Dynamic Range for Channel 1.......................................................... 27
31 FFT Plot Using Waveform Zoom Function.............................................................................. 27
List of Tables
1 Related Documentation..................................................................................................... 1
2 Power-Supply Test Points................................................................................................. 10
3 Analog Supply Configurations............................................................................................ 11
4 Digital Supply Configurations (DVDD and DGND)..................................................................... 11
5 CLK Jumper Options....................................................................................................... 12
6 External Reference Jumper Options..................................................................................... 12
7 Auxiliary Connector Test Signals and Test Points..................................................................... 12
8 Serial Interface Pinout..................................................................................................... 13
9 Register Assignments: Channel-Specific Settings..................................................................... 16
10 GPIO: General-Purpose I/O Register.................................................................................... 19
11 ADS131E08 Bill of Materials ............................................................................................. 28

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Trademarks
Pentium III, Celeron are registered trademarks of Intel Corporation.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
SPI is a trademark of Motorola, Inc..
All other trademarks are the property of their respective owners.
1 ADS131E08EVM Overview
1.1 Information about Cautions
This document contains caution statements. The information in a caution statement is provided for your
protection. Be sure to read each caution carefully.
CAUTION
This is an example of a caution statement. A caution statement describes a
situation that could potentially damage your software or equipment.
1.2 Introduction
The ADS131E08EVM-PDK is intended for evaluating the ADS131E08 low-power, 24-bit, simultaneously-
sampling, eight-channel analog-to-digital converter (ADC). The digital SPI™ control interface is provided
by the MMB0 modular EVM motherboard that connects to the ADS131E08 evaluation board. The
ADS131E08EVM-PDK is designed to expedite evaluation and system development.
The MMB0 motherboard allows the ADS131E08EVM to be connected to the computer thorugh an
available USB port. This manual shows how to use the MMB0 as part of the ADS131E08EVM-PDK, but
does not provide technical details about the MMB0.
1.3 Supported Features
Hardware Features:
• Configurable for bipolar or unipolar supply operation
• Configurable for internal and external clock through jumper settings
• Analog test signals can be applied easily using screw terminals
Software Features:
• Analysis tools, including a virtual oscilloscope, histogram, and fast Fourier transform (FFT)
• Access to a variety of register contents, including data rate, PGA options, and more.
• Set ADS131E08 register settings with easy-to-use, graphical user interface (GUI) software
1.3.1 Features Not Supported in Current Version
32 kSPS and 64 kSPS data capture is not supported by the current version of the firmware.

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1.4 ADS131E08EVM Hardware
Figure 2 shows the hardware included in the ADS131E08EVM kit. Contact the factory at http://e2e.ti.com
if any component is missing. Also, it is highly recommended that you check the TI website at
http://www.ti.com to verify that you have the latest software.
Figure 2. ADS131E08EVM-PDK Kit
The complete kit includes the following items:
• ADS131E08EVM printed-circuit board (PCB)
• MMB0 (modular EVM motherboard)
An external power supply is required to power the MMB0 board. Any supply used to power the MMB0
board through the jack located at J2 must comply with the following requirements:
• Output voltage: 5.5 VDC to 15 VDC
• Maximum output current: ≥500 mA
• Output connector: barrel plug (positive center), 2.5-mm I.D. x 5.5-mm O.D. (9-mm insertion depth)
• Complies with applicable regional safety standards

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2 Software Installation
2.1 Minimum Requirements
Before installing the software that is intended for use with the EVM kit, please verify that your PC-
compatible computer meets the following minimum requirements:
• Pentium III®or Celeron®processor, 866 MHz or equivalent
• Minimum 256 MB of RAM (512 MB or greater recommended)
• USB 1.1-compatible input
• Hard disk drive with at least 200 MB free space
• Microsoft®Windows®XP operating system with SP2, or Windows 7 operating system
• Mouse or other pointing device
• 1280 × 960 minimum display resolution

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2.2 Installing the Software
CAUTION
Do not connect the ADS131E08EVM hardware before installing the software on
a suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS131E08EVM.
Download the latest software from the TI website at www.ti.com/tool/ADS131E08EVM-PDK. To install the
ADS131E08 software, unzip and run setup.exe.Figure 3 shows the initialization screen.
Figure 3. Initialization of ADS131E08EVM GUI
You must accept the two license agreements shown in Figure 4 and Figure 5 before the installation can
proceed.
Figure 4. License 1 Figure 5. License 2

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2.3 Installing the ADS131E08EVM-PDK Hardware Drivers
2.3.1 Installing the First USB Driver
Apply power to the MMB0 using a power supply as discussed in Section 1.4 and connect the MMB0 to
your PC through any available USB port. The Found New Hardware Wizard window appears, as shown in
Figure 6. Note that this is the first of two USB drivers that are installed. Click Next to continue driver
installation.
Figure 6. New Hardware Wizard Screen 1
Click Next when the screen in Figure 7 appears.
Figure 7. New Hardware Wizard Screen 2

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Navigate to C:\Program Files\ADS131E08EVM\USB Driver, as shown in Figure 8.
Figure 8. New Hardware Wizard Screen 3
Click Next to find and install the driver. When the wizard is complete, the screen in Figure 9 appears.
Figure 9. Completion of the First USB Driver

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2.3.2 Installing the Second USB Driver
Launch the ADS131E08EVM-PDK software from the program menu. The software loads and begins
downloading firmware to the processor on the MMB0. After the firmware is loaded and running, the Found
New Hardware Wizard starts again, as shown in Figure 10.
Figure 10. Second New Hardware Wizard Screen
Click Next and the screen in Figure 11 appears.
Figure 11. Installing the USBStyx Driver
Click Next to complete the installation. If the computer is unable to find the USBStyx driver, point to the
installation directory of C:\Program Files\ADS131E08EVM\USB Drivers.
At this time, you may receive an error message because the ADS131E08EVM-PDK software has timed
out. If so, click OK, close the GUI program, power cycle the ADS131E08EVM, and restart the newly
installed ADS131E08 evaluation program. This process may need to be repeated if you plug the
ADS131E08EVM-PDK into a different USB port on your computer.

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3 ADS131E08EVM Daughter-Card Hardware Overview
CAUTION
Many of the components on the ADS131E08EVM are susceptible to damage
by electrostatic discharge (ESD). Customers are advised to observe proper
ESD handling procedures when unpacking and handling the EVM, including the
use of a grounded wrist strap, bootstraps, or mats at an approved ESD
workstation. An electrostatic smock and safety glasses should also be worn.
The ADS131E08EVM-PDK board is a four-layer circuit board. The board layout and schematics are
appended to the end of this document.
The ADS131E08EVM-PDK is configured to be used with the TI MMB0 data converter evaluation platform.
The key features of the ADS131E08 system on a chip (SOC) are:
• Eight integrated instrumentation amplifiers (INAs) and eight, 24-bit, high-resolution ADCs
• Low power consumption
• Data rates of 1 kSPS, 2 kSPS, 4 kSPS, 8 kSPS, 16 kSPS, 32 kSPS, and 64 kSPS (NOTE: 32 kSPS
and 64 kSPS data capture is not supported by the current version of the firmware).
• 3-V to 5-V unipolar or bipolar analog supply, and 1.8-V to 3-V digital supply
• SPI data interface
The following sections explain some of the hardware settings possible with the EVM for evaluating the
ADS131E08 under various test conditions.
3.1 Power Supply
The ADS131E08EVM mounts on the MMB0 board with connectors J1, J2, and J3. The main power
supplies (+5 V, +3 V, and +1.8 V) for the front-end board are supplied by the host MMB0 board through
connector J3. All other power supplies required for the front-end board are generated onboard by power
management devices.
The ADS131E08 operates in unipolar mode using a +3.0-V to +5.0-V analog supply (AVDD/AVSS) and a
+1.8-V to +3.3-V digital supply (DVDD), or in bipolar mode using the onboard analog supply (±1.5 V to
±2.5 V). The power consumption of the front-end board is measured by using the JP3 jumper. Power
down the ADS131E08 by shorting jumper JP4.
Test points TP4, TP5, TP6, TP7, TP8, TP9, TP10, and TP13 are provided to verify that the host power
supplies are correct. The corresponding voltages are shown in Table 2.
Table 2. Power-Supply Test Points
Test Point Voltage
TP7 +5.0 V
TP4 –4.96 V
TP9 +1.8 V
TP10 +3.3 V
TP5 +3.0 V
TP13 +2.5 V
TP6 –2.5 V
TP8 GND

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The front-end board must be properly configured in order to achieve the various power-supply schemes.
The default power-supply setting for the ADS131E08EVM is a bipolar analog supply of ±2.5 V, and there
are onboard options to switch to a unipolar analog supply of +3 V. The digital supply (DVDD) is selectable
to either +3.3 V or +1.8 V. Table 3 shows the board and component configurations for each analog power-
supply scheme. Table 4 shows the board configurations for the digital supply. Note that the EVM is
shipped with the analog supply set to ±2.5 V and digital supplies set to 3.3 V.
Table 3. Analog Supply Configurations
AVDD and AVSS
Unipolar Analog Supply Bipolar Analog Supply
3 V 5 V ±1.5 V ±2.5 V
JP7 1-2 1-2 2-3 2-3
JP1 2-3 2-3 1-2 1-2
U6 TPS73230 TPS73250 Don't care Don't care
U8 Don't care Don't care TPS73201 TPS73201
U7 Don't care Don't care TPS72301 TPS72301
R61 Don't care Don't care 21 kΩ47.5 kΩ
R62 Don't care Don't care 78.7 kΩ43.2 kΩ
R59 Don't care Don't care 23.3 kΩ49.9 kΩ
R60 Don't care Don't care 95.3 kΩ46.4 kΩ
C48, C54, C59 Not installed Not installed Not installed Not installed
Table 4. Digital Supply Configurations (DVDD and
DGND)
DVDD 3.3 V 1.8 V
JP11 2-3 1-2

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3.2 Clock
The ADS131E08 has an on-chip oscillator circuit that generates a 2.048-MHz clock (nominal). This clock
can vary by ±5% over temperature. For applications that require higher accuracy, the ADS131E08 can
also accept an external clock signal. The ADS131E08 provides an option to test both internal and external
clock configurations. It also provides an option to generate the external clock from either the onboard
oscillator or from an external clock source.
The onboard oscillator is powered by the DVDD supply of the ADS131E08. Care must be taken to ensure
that the external oscillator can operate either with +1.8 V or +3.3 V, depending on the DVDD supply
configuration. Table 5 shows the jumper settings for the three options for the ADS131E08 clocks.
Table 5. CLK Jumper Options
ADS131E08 Clock Internal Clock External OSC Clock External Clock
JP5 Not installed 2-3 1-2
JP6 Don't care 1-2 (disable) Don't care
J4 - pin 10 Don't care Don't care Clock source
A 2.048-MHz oscillator available for the +3.3-V DVDD supply is the FXO-HC735-2.048MHz. For a +1.8-V
DVDD supply, use the SiT8002AC-34-18E-2.048. The EVM is shipped with the external oscillator enabled.
3.3 Reference
The ADS131E08 has an on-chip internal reference circuit that provides reference voltages to the device.
Alternatively, the internal reference can be powered down and VREFP can be applied externally. This
configuration is achieved with the external reference generators (U2 and U3) and driver buffer. These
components (U2, U3, and U4) must be installed by the user; they are not installed at the factory. The
external reference voltage can be set to either 4.096 V or 2.5 V, depending on the analog supply voltage.
Measure TP3 to make sure the external reference is correct and stable. The settings for the external
reference is described in Table 6. This table assumes REF5025 is installed at U2 and REF5040 at U3. A
low-noise amplifier like the OPA350 can be installed at U4.
Table 6. External Reference Jumper Options
ADS131E08 Reference
Internal Reference External Reference
VREF = 2.5 V VREF = 4.096 V VREF = 2.5 V
JP12 Don't care 2-3 1-2
JP2 Not installed Installed Installed
3.3.1 Accessing ADS131E08 Analog Supplies
Some ADS131E08 output signals are provided as test points for probing purposes using J4 (not installed
on the board). Table 7 lists the various test signals with the corresponding test points.
Table 7. Auxiliary Connector Test Signals and Test Points
Signal J4 Pin Number Signal
Not connected 1 2 GPIO1
Not connected 3 4 GPIO2
PWDN 5 6 GPIO3
Dasiy in 7 8 GPIO4
AGND 9 10 Not connected

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3.3.2 Accessing ADS131E08 Digital Supplies
The ADS131E08 digital signals (including SPI signals, some GPIO signals, and some control signals) are
available at connector J1. These signals are used to interface to the MMB0 board DSP. The pinout for this
connector is shown in Table 8.
Table 8. Serial Interface Pinout
Signal J1 Pin Number Signal
START/CS 1 2 CLKSEL
CLK 3 4 GND
NC 5 6 GPIO1
CS 7 8 RESET
NC 9 10 GND
DIN 11 12 GPIO2
DOUT 13 14 NC/START
DRDY 15 16 SCL
EXT_CLK 17 18 GND
NC 19 20 SDA
3.4 Analog Inputs
The ADS131E08 provides users the option to feed in signals from any arbitrary signal source directly.
Analog signals can be applied at terminal blocks J5 through J12.

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4 Using the Software
The software GUI contains a Save to File feature (located in the Save tab) that allows all data from any
combination of channels, along with notes to describe the data, to be saved to a specified directory. This
data can then be read back using a text editor. Saving the data in this format can be completed by clicking
the Save to File button, as shown in Figure 12.
An additional option in the evaluation software allows register configurations to be saved to a file that can
be reloaded to the GUI. To create a configuration file with all of the stored register settings, use the Save
Configuration Settings option, found in the File menu at the top left-hand corner of the GUI. This
configuration file can be reloaded to the GUI using the Load Configuration Settings option found in the
same File menu.
Figure 12 shows the options available in the Save tab.
Figure 12. File Save Option Under Save Tab

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4.1 Software Overview
This section provides a quick overview of the various features and functions of the ADS131E08EVM
software package.
There are four tabs across the left side of the GUI; from top to bottom, they are:
•About: Provides information about the EVM and software version revisions.
•ADC Register: Includes all of the control registers for the ADS131E08 in a series of related subtabs:
– Channel Registers
– GPIO
– Register Map
•Analysis: Provides different ways to analyze captured data, in the time or frequency domain, using the
following subtabs:
– Scope
– Histogram
– FFT
•Save: Provides options for saving acquired data
4.2 Global Channel Registers
The Channel Registers tab provides access to the ADS131E08 configuration and fault threshold registers.
The Global Channel Registers tab has the following options:
•Configuration Register 1: Controls daisy-chain and multiple readback (MRB) modes, the CLKOUT
connection, and the output data rate. Note that the 32 kSPS and 64 kSPS data rates provide 16-bit
data (not supported by the current version of the firmware), and the 1 kSPS, 2 kSPS, 4 kSPS, 8 kSPS,
and 16 kSPS data rates are 24 bits wide.
•Configuration Register 2: Controls the internal test source, along with the test-signal amplitude and
frequency.
•Configuration Register 3: Controls the reference buffer power-down control, the reference voltage,
and the op amp buffer control.
•Fault Control Register: Sets the comparator threshold level for fault.
Figure 13 shows the GUI panel to manipulate these registers and the respective settings for each.
Figure 13. Channel Registers GUI for the Configuration Registers

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4.3 Channel Control Registers
The second section under the Channel Registers tab is the Channel Control Registers box. This panel
allows the user to uniquely configure the front-end multiplexer (mux) for each channel. Additionally, at the
top of the Channel Control Registers box is the option to globally set all channels to the same setting.
Table 9 lists the register map. The channel-specific mux is illustrated in Figure 14, and the all-channel-
specific mux is shown in Figure 15.
Table 9. Register Assignments: Channel-Specific Settings
Address Register Reset Value Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Channel-Specific Settings
05 CH1SET 00 PD1 GAIN12 GAIN11 GAIN10 0 MUXn2 MUXn1 MUXn0
06 CH2SET 0 PD2 GAIN22 GAIN21 GAIN20 0 MUX22 MUX21 MUX20
07 CH3SET 0 PD3 GAIN32 GAIN31 GAIN30 0 MUX32 MUX31 MUX30
08 CH4SET 0 PD4 GAIN42 GAIN41 GAIN40 0 MUX42 MUX41 MUX40
09 CH5SET 0 PD5 GAIN52 GAIN51 GAIN50 0 MUX52 MUX51 MUX50
0A CH6SET 0 PD6 GAIN62 GAIN61 GAIN60 0 MUX62 MUX61 MUX60
0B CH7SET 0 PD7 GAIN72 GAIN71 GAIN70 0 MUX72 MUX71 MUX70
0C CH8SET 0 PD8 GAIN82 GAIN81 GAIN80 0 MUX82 MUX81 MUX80
Figure 14. Channel Control Register GUI Panel: Single Channel Enabled
Figure 15. Channel Control Registers GUI Panel: All Channels Enabled

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4.4 Internal Test Signals Input and the Scope Display Tab
Configuration Register 2 controls the signal amplitude and frequency of an internally-generated square
wave test signal. The primary purpose of this test signal is to verify the functionality of the front-end mux,
the programmable gain amplifier (PGA), and the ADC. The test signals may be viewed on the
Analysis→Scope Display tab, as Figure 16 shows.
Figure 16. Example of Internal Test Signals Viewed on the Scope Display Tab

Temperature ( C)°=Temperature Readnig ( V) 145,300 Vm - m
m490 V/°C+ 25 C°
2x
1x
1x
8x
AVDD
AVSS
Temperature Sensor Monitor
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4.5 Temperature Sensor and the Scope Display Tab
The internal temperature sensor on the ADS131E08 is shown in Figure 22.
Figure 17. Internal Temperature Sensor
When the internal mux is routed to the temperature sensor input, the output voltage of the ADC may be
converted to a temperature value using Equation 1:
(1)
The output voltage corresponding to a given temperature can be read by running a data acquisition after
the Temperature Sensor mux option is selected, as shown in the Channel Control Registers section.
Figure 18 demonstrates an example of temperature sensor readings read back using the GUI.
Figure 18. Eight-Channel Read of Internal Temperature Data

Temperature ( C)°=0.1447 0.145300-
0.00049 + 25 = 23.78 C°
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The number 0.1447 V (on the y-axis) can be calculated as a temperature using Equation 2:
(2)
4.5.1 MVDD Input and the Scope Tab
The MVDD input option allows the measurement of the supply voltage VS= (AVDD + AVSS) / 2 for
channels 1, 2, 5, 6, 7, and 8; however, the supply voltage for channel 3 is DVDD / 2.
4.6 General-Purpose I/O Register (GPIO)
The GPIO registers control four general-purpose input and output (I/O) pins. Table 10 shows the
respective register to control these pins. Figure 19 illustrates the GPIO Control Register GUI panel.
Table 10. GPIO: General-Purpose I/O Register
Address Register Reset Value Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
14h GPIO 0Fh GPIOD4 GPIOD3 GPIOD2 GPIOD1 GPIOC4 GPIOC3 GPIOC2 GPIOC1
Figure 19. GPIO Control Register GUI Panel

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4.7 Fault Status Registers (FAULT_STATP and FAULT_STAIN)
The Fault Status registers store the status of whether the positive and/or negative input on each channel
has a fault. This is a convenient feature to help pinpoint if any of the inputs are out of range. The GUI for
this feature is enabled by clicking in the upper right-hand corner of the EVM software on the Show/Poll
Fault Status button, as shown in Figure 20.
Figure 20. Fault Status Indicator