User's Guide SBAU157B – August 2009 – Revised May 2011 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK ADS1115EVM (Left) and ADS1115EVM-PDK (Right) This user's guide describes the characteristics, operation, and use of the ADS1015EVM and ADS1115EVM, both by themselves and as part of the ADS1015EVM-PDK or ADS1115EVM-PDK. These evaluation modules (EVMs) are evaluation boards for the ADS1115, a 16-bit multi-channel, delta-sigma analog-to-digital converter (ADC), and the ADS1015, a 12-bit version of the ADS1115. The EVM allows evaluation of all aspects of the ADS1015 or ADS1115 device. Complete circuit descriptions, schematic diagrams, and bills of material are included in this document. The following related documents are available through the Texas Instruments web site at http://www.ti.com. EVM-Compatible Device Data Sheets Device Literature Number ADS1015 SBAS473 ADS1115 SBAS444 SN74LVC2G125 SCES204M PCA9306 SCPS113I ADCPro is a trademark of Texas Instruments. Microsoft, Windows are registered trademarks of Microsoft Corporation. I2C is a trademark of NXP Semiconductors. All other trademarks are the property of their respective owners. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 1 www.ti.com 1 2 3 4 5 6 7 8 Contents EVM Overview ............................................................................................................... 3 Analog Interface ............................................................................................................. 3 Digital Interface .............................................................................................................. 4 Power Supplies .............................................................................................................. 5 EVM Operation .............................................................................................................. 5 ADS1115EVM-PDK Kit Operation ........................................................................................ 6 Evaluating Performance with the ADCPro Software .................................................................. 15 Schematics and Layout ................................................................................................... 21 List of Figures 1 ADS1115EVM Default Jumper Locations................................................................................ 6 2 Virtual COM Port Installer .................................................................................................. 7 3 Virtual COM Port Setup .................................................................................................... 7 4 MMB3 Switch Locations.................................................................................................... 8 5 Connecting ADS1115EVM to MMB3 ..................................................................................... 9 6 MMB3 Block Diagram ..................................................................................................... 10 7 ADCPro Software Start-up Display Window ........................................................................... 11 8 ADS1115EVM-PDK Plug-In Display Window .......................................................................... 12 9 Connection Timeout ....................................................................................................... 13 10 Firmware Download Message Box ...................................................................................... 13 11 Firmware Download Progress Indicator ................................................................................ 14 12 Firmware Download Complete Message Box 13 Device 1 Tab ............................................................................................................... 17 14 About Tab 15 Progress Bar While Collecting Data 1 J1: Analog Interface Pinout ................................................................................................ 4 2 J3: Serial Interface Pins .................................................................................................... 4 3 J2 Configuration: Power-Supply Input .................................................................................... 5 4 JMP1 Configuration: Power Options 5 List of Switches .............................................................................................................. 6 6 ADS1015EVM/ADS1115EVM Bill of Materials ......................................................................... .................................................................................................................. .................................................................................... 15 19 20 List of Tables 2 ..................................................................................... ....................................................................... ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK 5 22 SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated EVM Overview www.ti.com 1 EVM Overview 1.1 Features ADS1015EVM/ADS1115EVM Features: • Contains all support circuitry needed for the ADS1015/ADS1115 • Two ADS1015/ADS1115 devices onboard to demonstrate I2C™ bus functionality • +3.3, +5V, or external power supply options for ADC • Compatible with the TI Modular EVM System ADS1015EVM-PDK/ADS1115EVM-PDK Features: • Easy-to-use evaluation software for Microsoft® Windows® XP • Data collection to text files • Built-in analysis tools including scope, FFT, and histogram displays • Complete control of board settings • Easily expandable with new analysis plug-in tools from Texas Instruments For use with a computer, the ADS1015EVM-PDK or ADS1115EVM-PDK is available. This kit combines the ADS1015/ADS1115EVM board with the MSP430-based MMB3 motherboard, and includes ADCPro™ software for evaluation. The MMB3 motherboard allows the ADS1015/ADS1115EVM to be connected to the computer via an available USB port. This manual shows how to use the MMB3 as part of the ADS1015EVM-PDK/ADS1115EVM-PDK, but does not provide technical details about the MMB3 itself. ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins. The ADS1015EVM-PDK/ADS1115EVM-PDK is controlled by a plug-in running in ADCPro. For more information about ADCPro, see the ADCPro™Analog-to-Digital Converter Evalutation Software User's Guide (literature number SBAU128), available for download from the TI web site. This manual covers the operation of both the ADS1015/ADS1115EVM and the ADS1015EVM-PDK/ADS1115EVM-PDK. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the ADS1015/ADS1115EVM. For clarity of reading, the rest of this manual will refer only to the ADS1115EVM or ADS1115EVM-PDK, but operation of the EVM and kit for the ADS1015 is identical, unless otherwise noted. 1.2 Introduction The ADS1115EVM is an evaluation module built to the TI Modular EVM System specification. It can be connected to any modular EVM system interface card. The ADS1115EVM is available as a stand-alone printed circuit board (PCB) or as part of the ADS1115EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the ADS1115EVM is useful for prototyping designs and firmware. Note that the ADS1115EVM has no microprocessor and cannot run software. To connect it to a computer, some type of interface is required. 2 Analog Interface For maximum flexibility, the ADS1115EVM is designed for easy interfacing to multiple analog sources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J1. This header/socket provides access to the analog input pins of the ADS1115. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 3 Digital Interface www.ti.com All of the pins on J1 are connected directly to the ADS1115 device input pins, with no protection. Use appropriate caution when handling these pins. Table 1 summarizes the pinouts for the analog interface J1. Table 1. J1: Analog Interface Pinout Pin Number Signal Description, ADS1015/ADS1115 J1.2 A0(+) AIN0, Device 1 (U1) J1.4 A1(+) AIN1, Device 1 (U1) J1.6 A2(+) AIN2, Device 1 (U1) J1.8 A3(+) AIN3, Device 1 (U1) J1.10 A0(+) AIN0, Device 2 (U2) J1.12 A1(+) AIN1, Device 2 (U2) J1.14 A2(+) AIN2, Device 2 (U2) J1.16 A3(+) AIN3, Device 2 (U2) J1.1-7 (odd) Unused J1.15 Unused J1.9-19 (odd) AGND J1.18, J1.20 Unused 3 Digital Interface 3.1 Serial Data Interface Analog ground connections (except J1.15) The ADS1115EVM is designed to easily interface with multiple control platforms. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J3. This header/socket provides access to the digital control and serial data pins of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. All logic levels on J3 are 3.3V CMOS, except for the I2C pins. These pins conform to 3.3V I2C rules. Table 2 describes the J3 serial interface pins. Table 2. J3: Serial Interface Pins 4 Pin No. Pin Name Signal Name I/O Type Pullup J3.1-19 (odd) — Unused — None J3.2 GPIO0 ALERT/RDY (U1) Out None Digital comparator output or conversion ready for Device 1 (U1) J3.4 DGND DGND In/Out None Digital ground J3.6 GPIO1 ALERT/RDY (U2) Out None Digital comparator output or conversion ready for Device 2 (U2) J3.8 GPIO2 Unused — None J3.10 DGND DGND In/Out None J3.12 GPIO3 Unused — None J3.14 GPIO4 Unused — None 2 Function Digital ground J3.16 SCL SCL IC High I2C clock J3.18 DGND DGND In/Out None Digital ground J3.20 SDA SDA I2C High I2C data ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated Power Supplies www.ti.com 4 Power Supplies J2 is the power-supply input connector. Table 3 lists the configuration details for J2. Table 3. J2 Configuration: Power-Supply Input 4.1 Pin No. Pin Name Function Required J2.1 +VA External analog supply If 3.3 or 5V supplies not used J2.2 –VA Unused No J2.3 +5VA Unused No J2.4 –5VA Unused No J2.5 DGND Digital ground input Yes J2.6 AGND Analog ground input Yes J2.7 +1.8VD Unused No J2.8 VD1 Unused No J2.9 +3.3VD 3.3V digital supply If 5V or external supplies not used J2.10 +5VD +5V digital supply If 3.3V or external supplies not used Power Options JMP1 is arranged as four rows, each of which can be shorted. Table 4 lists the power option details for JMP1. For normal operation, all jumpers should be installed. Table 4. JMP1 Configuration: Power Options Row Name Function 1-2 VDD1 Supply current measurement point for Device 1. Must be connected for operation. 3-4 VDD2 Supply current measurement point for Device 2. Must be connected for operation. 5-6 VDD Supply current measurement point for the other digital devices. Must be connected for operation. 7-8 GND Connects DGND to AGND. Switch S1 selects the supply voltage used to feed JMP1 and the respective VDDs shown in Table 4. S1 may be switched to +VA, +5VD, or +3.3VD from power connector J2. 5 EVM Operation This section provides information on the analog input, digital control, and general operating conditions of the ADS1115EVM. 5.1 Analog Input Each of the analog input sources can be applied directly to J1 (top or bottom side) or through signal-conditioning modules available for the the modular EVM system. 5.2 Digital Control The digital control signals can be applied directly to J3 (top or bottom side). The modular ADS1115EVM can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface or HPA-MCU Interface boards available from Texas Instruments, or the MMB3 if purchased as part of the ADS1115EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the ADS1115, see the relevant product folder on the TI web site. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 5 ADS1115EVM-PDK Kit Operation 5.3 www.ti.com Default Jumper Settings and Switch Positions Figure 1 shows the jumpers found on the EVM and the respective factory default conditions for each. Figure 1. ADS1115EVM Default Jumper Locations Table 5 lists the switches found on the EVM and the respective factory default conditions for each. Table 5. List of Switches 6 Switch Position Switch Description S1 Right (default) VDD = +3.3VD Center VDD = +5VD Left VDD = +VA ADS1115EVM-PDK Kit Operation This section provides information on using the ADS1115EVM-PDK, including setup, program installation, and program usage. To prepare Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. to evaluate the ADS1115 with the ADS1115EVM-PDK, complete the following steps: Install the ADCPro software (if not already installed) on a PC. Install the ADS1115EVM-PDK EVM plug-in software. Complete the USB driver installation process. Set up the ADS1115EVM-PDK. Connect the ADS1115EVM-PDK to the computer with a USB cable. Run the ADCPro software. Each task is described in the subsequent sections of this document. 6 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated ADS1115EVM-PDK Kit Operation www.ti.com 6.1 Installing the ADCPro Software CAUTION Do not connect the ADS1115EVM-PDK before installing the software on a suitable PC. Failure to observe this caution may cause Microsoft Windows to not recognize the ADS1115EVM-PDK as a connected device. The latest software is available from the TI website at http://www.ti.com. Refer to the ADCPro User Guide for instructions on installing and using ADCPro. To install the ADS1115EVM-PDK plug-in, run the file: ads1115evm-pdk-plug-in-1.0.0.exe (1.0.0 is the version number, and increments with software version releases). Double-click the file to run it; then follow the instructions shown. You can also use the ADCPro Update Check feature to check for newer versions of the ADS1115EVM-PDK plug-in, once you have installed a version of it. Follow the on-screen prompts. Once the ADCPro plug-in installs, you will be prompted to install the Virtual COM port driver as shown in Figure 2. Figure 2. Virtual COM Port Installer Press OK, and the screen shown in Figure 3 displays. Figure 3. Virtual COM Port Setup If you already have a TUSB3410 Virtual COM port driver installed on your system, select Cancel; otherwise, press Setup and follow the on-screen prompts. You may be notified that the driver is not digitally signed. If this occurs, select Continue Anyway and proceed. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 7 ADS1115EVM-PDK Kit Operation 6.2 www.ti.com Setting Up the ADS1115EVM-PDK The ADS1115EVM-PDK contains both the ADS1115EVM and the MMB3 motherboard; however, the devices are shipped unconnected. Follow these steps to set up the ADS1115EVM-PDK. Step 1. Unpack the ADS1115EVM-PDK kit. Step 2. Set the switches on the MMB3 as described below, as Figure 4 illustrates. • Set switch SW4 to the right. • Set the DAC switch (SW5) to the OUT position (to the right). Figure 4. MMB3 Switch Locations 8 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated ADS1115EVM-PDK Kit Operation www.ti.com space Step 3. Plug the ADS1115EVM into the MMB3 as Figure 5 illustrates. Figure 5. Connecting ADS1115EVM to MMB3 Step 4. Set the jumpers and switches on the ADS1115EVM as shown in Figure 1 (note that these settings are the factory-configured settings for the EVM). SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 9 ADS1115EVM-PDK Kit Operation 6.2.1 www.ti.com About the MMB3 The MMB3 is a Modular EVM System motherboard. It is designed around the MSP430F449, a low-power microcontroller from Texas Instruments. Figure 6 shows a block diagram of the MMB3. USB USB RESET +5VA -5VA +5VD PWR & VREF +3.3V +1.8V +10V TUSB3410 -10V Supplied to Daughtercard Power Connector LCD DISPLAY 2.5V OPER BSL +1 DAC1220 MSP430F449 RESET -1 DAC IN OUT Analog Daughtercard Modular Connectors Serial Power Joystick Power from PWR & VREF Block Figure 6. MMB3 Block Diagram The MMB3 was designed to be used as a stand-alone demonstration platform for low-speed data converters. It features an onboard, 20-bit digital-to-analog converter (DAC) that can be used as a signal source for an ADC under test, and has a joystick for control of functions on the board when it is not controlled by a PC. These features are experimental and not supported in the ADS1115EVM-PDK at this time. The MMB3 derives power from the USB interface, and generates +5VD, 3.3V, and 1.8V, as well as +5VA and –5VA and ±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA. CAUTION When using the ADS1115EVM connected to the MMB3, do not move switch S1 to the +VA position. This switch position will apply +10V to the devices on the EVM and damage the EVM. The MMB3 is not sold as a microcontroller development board, and it is not available separately. TI cannot offer support for the MMB3 except as part of an EVM kit. For schematics or other information about the MMB3, contact Texas Instruments. 10 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated ADS1115EVM-PDK Kit Operation www.ti.com 6.3 EVM Power Supply The ADS1115EVM-PDK is powered completely from the USB connection on the MMB3. The MMB3 provides 3.3V and 5V to the ADS1115EVM. 6.4 Running the Software and Download of Firmware to MMB3 NOTE: The software is continually under development. These instructions and screen images are current at the time of this writing, but may not exactly match future releases. The program for evaluating the ADS1115EVM-PDK is called ADCPro. This program uses plug-ins to communicate with the EVM. The ADS1115EVM-PDK plug-in is included in the ADS1115EVM-PDK package. The program currently runs only on Microsoft Windows platforms of Windows XP; Windows Vista is NOT supported. If this is the first time installing ADCPro and plug-ins, follow these procedures to run ADCPro and perform any necessary firmware installations. Make sure the ADCPro software and device plug-in software are installed as described in Section 6.1. Step 1. Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 7 appears. Figure 7. ADCPro Software Start-up Display Window SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 11 ADS1115EVM-PDK Kit Operation space Step 2. www.ti.com Select ADS1115EVM from the EVM drop-down menu. The ADS1115EVM-PDK plug-in appears in the left pane, as Figure 8 shows. Figure 8. ADS1115EVM-PDK Plug-In Display Window Step 3. 12 The ADS1115EVM-PDK plug-in window has a status area at the top of the screen. When the plug-in is first loaded, the plug-in searches for the board. You will see a series of messages in the status area indicating this action. ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated ADS1115EVM-PDK Kit Operation www.ti.com space Step 4. If the plug-in cannot connect to the EVM, you will see a window as shown in Figure 9. This message may indicate that the firmware is not loaded on the MMB3. You may select Retry Auto Connect; if that action fails, select Retry Manual Connect and specify the COM port to be used. Figure 9. Connection Timeout Step 5. The plug-in will detect whether or not the board has the correct firmware loaded. The first time you use the ADS1115EVM-PDK, the firmware for the MMB3 may need to be downloaded to the MMB3. If the firmware needs to be loaded, you will see a screen as shown in Figure 10. Figure 10. Firmware Download Message Box SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 13 ADS1115EVM-PDK Kit Operation www.ti.com Switch the BSL switch (SW4) on the MMB3 to the BSL position (to the left) as instructed, then press OK. The plug-in will download the firmware to the MMB3. This operation may take a couple of minutes, so the progress is updated in the message at the top of the ADS1115 plug-in window (as Figure 11 shows). The firmware is saved in flash memory on the MMB3, so this operation should only need to be performed once. Figure 11. Firmware Download Progress Indicator 14 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated Evaluating Performance with the ADCPro Software www.ti.com When the firmware download completes, the message box shown in Figure 12 appears. Follow the on-screen instructions and the plug-in should now connect to the EVM. Figure 12. Firmware Download Complete Message Box 7 Evaluating Performance with the ADCPro Software The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option from the corresponding menu. Only one of each kind of plug-in can be loaded at a time. If you select a different plug-in, the previous plug-in is unloaded. 7.1 Using the ADS1115EVM-PDK Plug-in The ADS1115EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS1115. It consists of a tabbed interface (see Figure 13), with different functions available on different tabs. These controls are described in this section. You can adjust the ADS1115EVM settings when you are not acquiring data. During acquisition, all controls are disabled and settings may not be changed. The ADS1115EVM plug-in always collects data from both ADS1115 devices on the EVM, so you must be sure to have both devices configured as desired in order to collect meaningful data. When you change a setting on the ADS1115EVM plug-in, the setting immediately updates on the board. Settings on the ADS1115EVM correspond to settings described in the ADS1115 product data sheet (available for download at www.ti.com) for details. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 15 Evaluating Performance with the ADCPro Software 7.1.1 www.ti.com Data Rate and Sampling Information The Data Rate control on the main plug-in window sets the data rate for both ADS1115 converters on the EVM. It is a requirement of the ADCPro software that both devices operate at the same data rate. The ADS1115EVM-PDK always operates the device in continuous conversion mode; one-shot power-down mode is not supported. The ADS1115EVM-PDK allows the Data Rate control to set the data rate to 8, 16, 32, 64, 128, 250, 475, or 860 samples per second (SPS). Note that the data rate can go quite low; therefore, if the block size is large, the time it takes to collect a block of data can be quite long. It is advisable to first test collection at the higher data rates. Once a test is known to work properly, drop down to the lower data rate and allow sufficient time to collect the data. The ADS1015EVM-PDK allows the Data Rate control to set the data rate to 128, 256, 500, 920, 1600, 2500, or 3300 SPS. The MMB3 does not have the capability to send every sample at data rates above 920 SPS; when a data rate higher than this is selected, the data points collected will not be continuous. The ADS1015 will operate at the higher data rate, but data will be collected at 920 SPS, skipping some data points. Note that both the ADS1115 and ADS1015 have internal clocks with a ±10% accuracy. If performing FFT tests, frequencies may appear to be incorrect as a result of this tolerance range. At data rates above 920 SPS, the sample rate reported to test plug-ins will be 920 SPS so that FFT tests should run properly. The ADS1115EVM-PDK plug-in has a tabbed interface, with two different tabs to control the other functions of the two ADS1115s on the EVM. These tabs are described below. 16 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated Evaluating Performance with the ADCPro Software www.ti.com 7.1.2 Device 1 Tab This tab, shown in Figure 13, is the primary tab that controls all features of the ADS1115. Device 1 refers to U1 on the ADS1115EVM. Figure 13. Device 1 Tab SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 17 Evaluating Performance with the ADCPro Software www.ti.com The I2C Address groupbox contains controls related to the setting of the I2C address of Device 1. The JMP2 Settings control is set up to mimic the layout of JMP2 on the EVM. When, for example, a jumper is installed in the rightmost position, connecting the ADS1115 ADDR pin to GND, the GND radio button should be selected here. Whenever the JMP2 settings are changed, the I2C address of the device is changed, and the corresponding address value is shown in the 7 bit and 8 bit indicators. The 7 bit indicator shows the address considering only the seven bits that set the address of the device; the 8 bit indicator reflects how a byte would actually be viewed if the eighth bit (the R/W bit) is set to zero. The ACK light will reflect whether or not the address selected returns an I2C acknowledgement. If this light is red, then no device was found at that address. This result may indicate that the jumper settings on the EVM do not match the selection in the JMP2 Settings. A red light may also indicate that the two devices on the board have been set to the same I2C address, and this state will be indicated by a message at the top of the plug-in that says I2C Address Conflict. The two devices on the ADS1115EVM must be set for different I2C addresses in order for the plug-in to operate. When a valid I2C address is selected, the ACK light will turn green, indicating that a valid address has been found on the bus. The Mux Setting control determines which set of inputs is used, displayed as AINP:AINN, where AINP is the input connected to the positive input of the ADC, and AINN is the input connected to the negative input of the ADC. Selections available are AIN0:AIN1, AIN0:AIN3, AIN1:AIN3, AIN2:AIN3, AIN0:GND, AIN1:GND, AIN2:GND, or AIN3:GND. The PGA Gain control sets the PGA gain. Selections available are 0.66666, 1, 2, 4, 8, or 16. The Comparator groupbox contains controls related to the comparator functions of the ADS1115. The Queue control selects whether to Disable Comparator, or to enable the comparator and have it Assert after one conversion, Assert after two conversions, or Assert after four conversions. The comparator output status is reflected by the D1 LED on the EVM. The Mode switch allows selection of the comparator mode, either Traditional or Window. The Action switch selects between Non-latching or Latching operation, and the Polarity switch determines if the ALERT output of the device is Active Low or Active High. More details on these settings can be found in the product data sheet. The LO_THRESH and HI_THRESH controls set the numbers that are placed in corresponding low and high threshold registers of the ADS1115. These numbers are displayed and entered in decimal format. 7.1.3 Device 2 Tab This tab is identical to the Device 1 tab, but controls the settings for Device 2, which is U2 on the ADS1115EVM. 18 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated Evaluating Performance with the ADCPro Software www.ti.com 7.1.4 About Tab The About tab displays information about the EVM and software, as shown in Figure 14. Figure 14. About Tab The Plugin Version and Firmware Version indicators show the version numbers of the plug-in and firmware code, respectively. The Notes indicator will show manufacturing information about the EVM that is stored in the EVM EEPROM, and may show relevant notes about the plug-in or firmware code, if there are any. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 19 Evaluating Performance with the ADCPro Software 7.1.5 www.ti.com Collecting Data Once you have configured the ADS1115 for your test scenario, press the ADCPro Acquire button to start the collection of the number of datapoints specified in the Test plug-in Block Size control. The ADS1115EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress bar as shown in Figure 15. Figure 15. Progress Bar While Collecting Data For more information on testing analog-to-digital converters in general and using ADCPro and Test plug-ins, refer to the ADCPro User Guide. 20 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated Schematics and Layout www.ti.com 7.2 Troubleshooting • • • 8 If the ADS1115EVM plug-in cannot find the ADS1115EVM-PDK, press the USB RESET button on the MMB3 (refer to Figure 4) and try again. If the MMB3 board is unable to be detected, there may be conflicting settings for the COM port assignments on your PC that requires manual configuration. 1. Open the Device Manager application under Windows. You should observe an item entitled USB-Serial Port under the Ports (COM&LPT) menu. 2. If the USB - Serial Port is configured to use a COM port already in use, you can either disable the current use for the port OR configure the USB-Serial Port as a COM port that is not used. To do this: (a) Select the COM port item and right-click to access the Properties menu. (b) In the properties, select the Port Settings tab. (c) Select the Advanced button. (d) Select the desired COM port setting from the COM Port Number control. This control will note if the COM port is in use or open. 3. Press the USB RESET button on the MMB3 to reconnect. If ADCPro stops responding while the ADS1115EVM-PDK is connected, try unplugging the USB cable from the PDK. Unload and reload the plug-in before reapplying power to the PDK. Schematics and Layout Schematics for the ADS1015EVM and ADS1115EVM are appended to this user's guide. The bill of materials is provided in Table 6. SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Copyright © 2009–2011, Texas Instruments Incorporated 21 Schematics and Layout 8.1 www.ti.com Bill of Materials NOTE: All components should be compliant with the European Union Restriction on Use of Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or RoHS. Verify that purchased components are RoHS-compliant. (For more information about TI's position on RoHS compliance, see the TI web site.) Table 6. ADS1015EVM/ADS1115EVM Bill of Materials 22 Item No. Qty 1 1 Value 2 6 3 2 D1, D2 LED, Red, 0805 Lumex SML-LXT0805IW-TR 4 2 J1A, J3A 20-pin SMT Plug Samtec TSM-110-01-L-DV-P 5 2 J1B, J3B 20-pin SMT Socket Samtec SSW-110-22-F-D-VS-K 6 1 J2A 10-pin SMT Plug Samtec TSM-105-01-L-DV-P 7 1 J2B 10-pin SMT Socket Samtec SSW-105-22-F-D-VS-K 8 0 J4 Header Strip, 6-pin ( ) 9 3 JMP1, JMP2, JMP3 Header Strip, 8-pin ( ) Samtec TSW-104-07-L-D 10 2 JMP4, JMP5 Header Strip, 2-pin ( ) Samtec TSW-102-07-L-S 11 1 Q1 N-Channel Enhancement MOSFET Fairchild NDC7002N 12 2 470 R3, R4 1/10 W, Chip Resistor, ±5% 0603 Panasonic ERJ-3GEYJ471V 13 6 1kΩ R1, R2, R5, R6, R8, R9 1/10 W, Chip Resistor, ±5%, 0603 Panasonic ERJ-3GEYJ102V 14 1 200kΩ R7 1/10 W, Chip Resistor, ±5%, 0603 Panasonic ERJ-3GEYJ204V 15 0 RA1 Resistor, Chip Array Four Independent Bus 100kΩ, 5%, 1/16W, SMD 16 1 S1 DP3T Slide Switch E-Switch 17 2 TP1,TP2 PCB Test Point, Large Loop, Through-Hole Keystone Electronics 5011 18 2 U1,U2 Analog-Digital Converter Texas Instruments ADS1115IRUG—ADS1115 EVM ADS1015IRUG—ADS1015 EVM 19 1 U3 I2C Bus Level Shifter Texas Instruments PCA9306DCT 20 1 U4 EEPROM, 1.8V, 256K Microchip 24AA256-I/ST 21 1 U5 Dual Gate Buffer, 3-state Texas Instruments 22 8 N/A Shorting Blocks Samtec 0.1μF Ref Des Description Vendor N/A ADS1015/1115 EVM PWB Texas Instruments 6511174 C1, C2, C3, C4, C5, C6 16V Ceramic Chip Capacitor X7R Panasonic ECJ-1VB1C104K ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK Part Number EG2305A SN74LVC2G125DCU SNT-100-BK-G-H SBAU157B – August 2009 – Revised May 2011 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated 1 2 3 4 5 6 REVISION HISTORY REV ENGINEERING CHANGE NUMBER APPROVED D D VDD VDD R3 470 R4 470 D1 LED VDD R1 1K VDD1 VDD1 B AIN0 AIN1 AIN2 AIN3 GND 2 4 6 8 10 8 1 2 9 10 VDD ADDR ALERT/RDY SDA SCL 1k U5B 5 3 SN74LVC2G125DCU JPR-2X4 2 4 6 8 10 12 14 16 18 20 GPIO0 DGND GPIO1 GPIO2 DGND GPIO3 GPIO4 SCL DGND SDA CNTL CLKX CLKR FSX FSR DX DR INT TOUT GPIO5 1 3 5 7 9 11 13 15 17 19 DAUGHTER-SERIAL VDD +3.3VD C3 S1 ESW_EG2305A JMP1 VDD1 1 3 5 7 VDD2 VDD 0.1uF R7 200K 0.1uF 2 4 6 8 R8 1K C4 VDD DAUGHTER-POWER +3.3VD J3 R6 2 4 6 8 ADS1015 ADS1115 TP2 AGND -VA -5VA AGND VD1 +5VD VDD2 JMP3 1 3 5 7 0.1uF 4 5 6 7 3 0.1uF 6 SN74LVC2G125DCU VDD2 C2 U5A 2 JMP4 R9 1K 2 +VA +5VA DGND +1.8VD +3.3VD JPR-2X4 U2 J2 1 3 5 7 9 8 1 2 9 10 VDD ADDR ALERT/RDY SDA SCL C6 2 ADS1015 ADS1115 DAUGHTER-ANALOG TP1 DGND AIN0 AIN1 AIN2 AIN3 GND C +3.3VD JMP5 B U3 2 4 3 1 JPR-2X4 VDD VREF1 SDA1 SCL1 GND VREF2 EN SDA2 SCL2 7 8 5 6 1 4 5 6 7 3 1k 1 2 4 6 8 10 12 14 16 18 20 A0(+) A1(+) A2(+) A3(+) A4 A5 A6 A7 REFREF+ 2 4 6 8 7 A0(-) A1(-) A2(-) A3(-) AGND AGND AGND VCOM AGND AGND FRC_NDC7002N 8 U1 J1 1 3 5 7 9 11 13 15 17 19 1 3 5 7 FRC_NDC7002N R5 JMP2 0.1uF Q1B 4 C Q1A 1 C1 R2 1K D2 LED PCA9306DCT RA1 100K U4 J4 1 3 5 2 4 6 HEADER-3X2_SPECIAL 1 2 3 7 A0 A1 A2 WP VDD 8 5 6 4 VCC SDA SCL GND C5 0.1uF MCP_24AA256-I/ST ti A PRECISION ANALOG PRODUCTS HIGH-PERFORMANCE ANALOG DIVISION SEMICONDUCTOR GROUP 5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA RICK DOWNS DRAWN BY BOB BENJAMIN DOCUMENT CONTROL NO. SHEET 1 1 2 3 4 5 TITLE ENGINEER OF 1 6511174 SIZE B ADS1015EVM ADS1115EVM DATE 6-Jul-2009 FILE 6 REV A A Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. 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